content stringlengths 1 1.04M ⌀ |
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`protect begin_protected
`protect version = 1
`protect encrypt_agent = "XILINX"
`protect encrypt_agent_info = "Xilinx Encryption Tool 2014"
`protect key_keyowner = "Cadence Design Systems.", key_keyname= "cds_rsa_key", key_method = "rsa"
`protect encoding = (enctype = "BASE64", line_length = 76, bytes = 64)
`protect key_block
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`protect key_keyowner = "Mentor Graphics Corporation", key_keyname= "MGC-VERIF-SIM-RSA-1", key_method = "rsa"
`protect encoding = (enctype = "BASE64", line_length = 76, bytes = 128)
`protect key_block
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`protect key_keyowner = "Xilinx", key_keyname= "xilinx_2014_03", key_method = "rsa"
`protect encoding = (enctype = "BASE64", line_length = 76, bytes = 256)
`protect key_block
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`protect key_keyowner = "Synopsys", key_keyname= "SNPS-VCS-RSA-1", key_method = "rsa"
`protect encoding = (enctype = "BASE64", line_length = 76, bytes = 128)
`protect key_block
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`protect key_keyowner = "Aldec", key_keyname= "ALDEC15_001", key_method = "rsa"
`protect encoding = (enctype = "BASE64", line_length = 76, bytes = 256)
`protect key_block
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`protect key_keyowner = "ATRENTA", key_keyname= "ATR-SG-2015-RSA-3", key_method = "rsa"
`protect encoding = (enctype = "BASE64", line_length = 76, bytes = 256)
`protect key_block
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`protect begin_protected
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`protect key_block
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`protect key_keyowner = "Aldec", key_keyname= "ALDEC15_001", key_method = "rsa"
`protect encoding = (enctype = "BASE64", line_length = 76, bytes = 256)
`protect key_block
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`protect key_keyowner = "ATRENTA", key_keyname= "ATR-SG-2015-RSA-3", key_method = "rsa"
`protect encoding = (enctype = "BASE64", line_length = 76, bytes = 256)
`protect key_block
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`protect data_method = "AES128-CBC"
`protect encoding = (enctype = "BASE64", line_length = 76, bytes = 52272)
`protect data_block
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|
`protect begin_protected
`protect version = 1
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`protect encrypt_agent_info = "Xilinx Encryption Tool 2014"
`protect key_keyowner = "Cadence Design Systems.", key_keyname= "cds_rsa_key", key_method = "rsa"
`protect encoding = (enctype = "BASE64", line_length = 76, bytes = 64)
`protect key_block
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`protect encoding = (enctype = "BASE64", line_length = 76, bytes = 128)
`protect key_block
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`protect encoding = (enctype = "BASE64", line_length = 76, bytes = 256)
`protect key_block
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`protect encoding = (enctype = "BASE64", line_length = 76, bytes = 128)
`protect key_block
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`protect encoding = (enctype = "BASE64", line_length = 76, bytes = 256)
`protect key_block
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`protect encoding = (enctype = "BASE64", line_length = 76, bytes = 256)
`protect key_block
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`protect encoding = (enctype = "BASE64", line_length = 76, bytes = 52272)
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`protect end_protected
|
-- Copyright (C) 2001 Bill Billowitch.
-- Some of the work to develop this test suite was done with Air Force
-- support. The Air Force and Bill Billowitch assume no
-- responsibilities for this software.
-- This file is part of VESTs (Vhdl tESTs).
-- VESTs is free software; you can redistribute it and/or modify it
-- under the terms of the GNU General Public License as published by the
-- Free Software Foundation; either version 2 of the License, or (at
-- your option) any later version.
-- VESTs is distributed in the hope that it will be useful, but WITHOUT
-- ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
-- FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
-- for more details.
-- You should have received a copy of the GNU General Public License
-- along with VESTs; if not, write to the Free Software Foundation,
-- Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
-- ---------------------------------------------------------------------
--
-- $Id: tc2941.vhd,v 1.2 2001-10-26 16:30:24 paw Exp $
-- $Revision: 1.2 $
--
-- ---------------------------------------------------------------------
package c02s02b00x00p07n04i02941pkg is
procedure proc1 (x, y : integer);
end c02s02b00x00p07n04i02941pkg;
package body c02s02b00x00p07n04i02941pkg is
procedure proc1 (x : integer; y :integer) is --Failure_here
begin
end proc1;
end c02s02b00x00p07n04i02941pkg;
ENTITY c02s02b00x00p07n04i02941ent IS
END c02s02b00x00p07n04i02941ent;
ARCHITECTURE c02s02b00x00p07n04i02941arch OF c02s02b00x00p07n04i02941ent IS
BEGIN
TESTING: PROCESS
BEGIN
assert FALSE
report "***FAILED TEST: c02s02b00x00p07n04i02941 - Subprogram specification in package body does not conform to the subprogram specification of the declaration."
severity ERROR;
wait;
END PROCESS TESTING;
END c02s02b00x00p07n04i02941arch;
|
-- Copyright (C) 2001 Bill Billowitch.
-- Some of the work to develop this test suite was done with Air Force
-- support. The Air Force and Bill Billowitch assume no
-- responsibilities for this software.
-- This file is part of VESTs (Vhdl tESTs).
-- VESTs is free software; you can redistribute it and/or modify it
-- under the terms of the GNU General Public License as published by the
-- Free Software Foundation; either version 2 of the License, or (at
-- your option) any later version.
-- VESTs is distributed in the hope that it will be useful, but WITHOUT
-- ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
-- FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
-- for more details.
-- You should have received a copy of the GNU General Public License
-- along with VESTs; if not, write to the Free Software Foundation,
-- Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
-- ---------------------------------------------------------------------
--
-- $Id: tc2941.vhd,v 1.2 2001-10-26 16:30:24 paw Exp $
-- $Revision: 1.2 $
--
-- ---------------------------------------------------------------------
package c02s02b00x00p07n04i02941pkg is
procedure proc1 (x, y : integer);
end c02s02b00x00p07n04i02941pkg;
package body c02s02b00x00p07n04i02941pkg is
procedure proc1 (x : integer; y :integer) is --Failure_here
begin
end proc1;
end c02s02b00x00p07n04i02941pkg;
ENTITY c02s02b00x00p07n04i02941ent IS
END c02s02b00x00p07n04i02941ent;
ARCHITECTURE c02s02b00x00p07n04i02941arch OF c02s02b00x00p07n04i02941ent IS
BEGIN
TESTING: PROCESS
BEGIN
assert FALSE
report "***FAILED TEST: c02s02b00x00p07n04i02941 - Subprogram specification in package body does not conform to the subprogram specification of the declaration."
severity ERROR;
wait;
END PROCESS TESTING;
END c02s02b00x00p07n04i02941arch;
|
-- Copyright (C) 2001 Bill Billowitch.
-- Some of the work to develop this test suite was done with Air Force
-- support. The Air Force and Bill Billowitch assume no
-- responsibilities for this software.
-- This file is part of VESTs (Vhdl tESTs).
-- VESTs is free software; you can redistribute it and/or modify it
-- under the terms of the GNU General Public License as published by the
-- Free Software Foundation; either version 2 of the License, or (at
-- your option) any later version.
-- VESTs is distributed in the hope that it will be useful, but WITHOUT
-- ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
-- FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
-- for more details.
-- You should have received a copy of the GNU General Public License
-- along with VESTs; if not, write to the Free Software Foundation,
-- Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
-- ---------------------------------------------------------------------
--
-- $Id: tc2941.vhd,v 1.2 2001-10-26 16:30:24 paw Exp $
-- $Revision: 1.2 $
--
-- ---------------------------------------------------------------------
package c02s02b00x00p07n04i02941pkg is
procedure proc1 (x, y : integer);
end c02s02b00x00p07n04i02941pkg;
package body c02s02b00x00p07n04i02941pkg is
procedure proc1 (x : integer; y :integer) is --Failure_here
begin
end proc1;
end c02s02b00x00p07n04i02941pkg;
ENTITY c02s02b00x00p07n04i02941ent IS
END c02s02b00x00p07n04i02941ent;
ARCHITECTURE c02s02b00x00p07n04i02941arch OF c02s02b00x00p07n04i02941ent IS
BEGIN
TESTING: PROCESS
BEGIN
assert FALSE
report "***FAILED TEST: c02s02b00x00p07n04i02941 - Subprogram specification in package body does not conform to the subprogram specification of the declaration."
severity ERROR;
wait;
END PROCESS TESTING;
END c02s02b00x00p07n04i02941arch;
|
library ieee;
use std.textio.all;
entity board_test is
end board_test;
architecture arch of board_test is
function print_matrix(mat: work.matrix_pkg.matrix)
return integer is
variable l : line;
begin
writeline (output, l);
for i in work.matrix_pkg.X downto 0 loop
for j in work.matrix_pkg.Y downto 0 loop
write (l, ' ');
write (l, mat(i,j));
end loop;
writeline (output, l);
end loop;
return 0;
end print_matrix;
component board
generic (
init_state : work.matrix_pkg.matrix := ((0, 1, 0, 0, 0),
(0, 0, 1, 0, 0),
(1, 1, 1, 0, 0),
(0, 0, 0, 0, 0),
(0, 0, 0, 0, 0))
);
port (
mat: inout work.matrix_pkg.matrix;
clock: in integer range 0 to 1
);
end component;
for board_1: board use entity work.board;
signal mat: work.matrix_pkg.matrix;
signal clock: integer range 0 to 1;
begin
board_1: board
port map (mat => mat, clock => clock);
process
variable l: integer range 0 to 1;
begin
for i in 1 to 12 loop
l := print_matrix(mat);
clock <= 1 - clock;
wait for 1 ns;
end loop;
wait;
end process;
end arch;
|
library ieee;
use std.textio.all;
entity board_test is
end board_test;
architecture arch of board_test is
function print_matrix(mat: work.matrix_pkg.matrix)
return integer is
variable l : line;
begin
writeline (output, l);
for i in work.matrix_pkg.X downto 0 loop
for j in work.matrix_pkg.Y downto 0 loop
write (l, ' ');
write (l, mat(i,j));
end loop;
writeline (output, l);
end loop;
return 0;
end print_matrix;
component board
generic (
init_state : work.matrix_pkg.matrix := ((0, 1, 0, 0, 0),
(0, 0, 1, 0, 0),
(1, 1, 1, 0, 0),
(0, 0, 0, 0, 0),
(0, 0, 0, 0, 0))
);
port (
mat: inout work.matrix_pkg.matrix;
clock: in integer range 0 to 1
);
end component;
for board_1: board use entity work.board;
signal mat: work.matrix_pkg.matrix;
signal clock: integer range 0 to 1;
begin
board_1: board
port map (mat => mat, clock => clock);
process
variable l: integer range 0 to 1;
begin
for i in 1 to 12 loop
l := print_matrix(mat);
clock <= 1 - clock;
wait for 1 ns;
end loop;
wait;
end process;
end arch;
|
------------------------------------------------------------------------------
-- "standard_textio_additions" package contains the additions to the built in
-- "standard.textio" package.
-- This package should be compiled into "ieee_proposed" and used as follows:
-- use ieee_proposed.standard_textio_additions.all;
-- Last Modified: $Date: 2007-03-13 14:25:58-04 $
-- RCS ID: $Id: standard_textio_additions_c.vhdl,v 1.5 2007-03-13 14:25:58-04 l435385 Exp $
--
-- Created for VHDL-200X par, David Bishop (dbishop@vhdl.org)
------------------------------------------------------------------------------
use std.textio.all;
package standard_textio_additions is
-- procedure DEALLOCATE (P : inout LINE);
procedure FLUSH (file F : TEXT);
function MINIMUM (L, R : SIDE) return SIDE;
function MAXIMUM (L, R : SIDE) return SIDE;
function TO_STRING (VALUE : SIDE) return STRING;
function JUSTIFY (VALUE : STRING; JUSTIFIED : SIDE := right; FIELD : WIDTH := 0) return STRING;
procedure SREAD (L : inout LINE; VALUE : out STRING; STRLEN : out NATURAL);
alias STRING_READ is SREAD [LINE, STRING, NATURAL];
alias BREAD is READ [LINE, BIT_VECTOR, BOOLEAN];
alias BREAD is READ [LINE, BIT_VECTOR];
alias BINARY_READ is READ [LINE, BIT_VECTOR, BOOLEAN];
alias BINARY_READ is READ [LINE, BIT_VECTOR];
procedure OREAD (L : inout LINE; VALUE : out BIT_VECTOR; GOOD : out BOOLEAN);
procedure OREAD (L : inout LINE; VALUE : out BIT_VECTOR);
alias OCTAL_READ is OREAD [LINE, BIT_VECTOR, BOOLEAN];
alias OCTAL_READ is OREAD [LINE, BIT_VECTOR];
procedure HREAD (L : inout LINE; VALUE : out BIT_VECTOR; GOOD : out BOOLEAN);
procedure HREAD (L : inout LINE; VALUE : out BIT_VECTOR);
alias HEX_READ is HREAD [LINE, BIT_VECTOR, BOOLEAN];
alias HEX_READ is HREAD [LINE, BIT_VECTOR];
procedure TEE (file F : TEXT; L : inout LINE);
procedure WRITE (L : inout LINE; VALUE : in REAL;
FORMAT : in STRING);
alias SWRITE is WRITE [LINE, STRING, SIDE, WIDTH];
alias STRING_WRITE is WRITE [LINE, STRING, SIDE, WIDTH];
alias BWRITE is WRITE [LINE, BIT_VECTOR, SIDE, WIDTH];
alias BINARY_WRITE is WRITE [LINE, BIT_VECTOR, SIDE, WIDTH];
procedure OWRITE (L : inout LINE; VALUE : in BIT_VECTOR;
JUSTIFIED : in SIDE := right; FIELD : in WIDTH := 0);
alias OCTAL_WRITE is OWRITE [LINE, BIT_VECTOR, SIDE, WIDTH];
procedure HWRITE (L : inout LINE; VALUE : in BIT_VECTOR;
JUSTIFIED : in SIDE := right; FIELD : in WIDTH := 0);
alias HEX_WRITE is HWRITE [LINE, BIT_VECTOR, SIDE, WIDTH];
end package standard_textio_additions;
library ieee_proposed;
use ieee_proposed.standard_additions.all;
package body standard_textio_additions is
-- pragma synthesis_off
constant NUS : STRING(2 to 1) := (others => ' '); -- NULL array
constant NBSP : CHARACTER := CHARACTER'val(160); -- space character
-- Writes L to a file without modifying the contents of the line
procedure TEE (file F : TEXT; L : inout LINE) is
begin
write (OUTPUT, L.all & LF);
writeline(F, L);
end procedure TEE;
procedure FLUSH (file F: TEXT) is -- Implicit
begin
file_close (F);
end procedure FLUSH;
-- Read and Write procedure for strings
procedure SREAD (L : inout LINE;
VALUE : out STRING;
STRLEN : out natural) is
variable ok : BOOLEAN;
variable c : CHARACTER;
-- Result is padded with space characters
variable result : STRING (1 to VALUE'length) := (others => ' ');
begin
VALUE := result;
loop -- skip white space
read(L, c, ok);
exit when (ok = false) or ((c /= ' ') and (c /= NBSP) and (c /= HT));
end loop;
-- Bail out if there was a bad read
if not ok then
STRLEN := 0;
return;
end if;
result (1) := c;
STRLEN := 1;
for i in 2 to VALUE'length loop
read(L, c, ok);
if (ok = false) or ((c = ' ') or (c = NBSP) or (c = HT)) then
exit;
else
result (i) := c;
end if;
STRLEN := i;
end loop;
VALUE := result;
end procedure SREAD;
-- Hex Read and Write procedures for bit_vector.
-- Procedure only visible internally.
procedure Char2QuadBits (C : CHARACTER;
RESULT : out BIT_VECTOR(3 downto 0);
GOOD : out BOOLEAN;
ISSUE_ERROR : in BOOLEAN) is
begin
case c is
when '0' => result := x"0"; good := true;
when '1' => result := x"1"; good := true;
when '2' => result := x"2"; good := true;
when '3' => result := x"3"; good := true;
when '4' => result := x"4"; good := true;
when '5' => result := x"5"; good := true;
when '6' => result := x"6"; good := true;
when '7' => result := x"7"; good := true;
when '8' => result := x"8"; good := true;
when '9' => result := x"9"; good := true;
when 'A' | 'a' => result := x"A"; good := true;
when 'B' | 'b' => result := x"B"; good := true;
when 'C' | 'c' => result := x"C"; good := true;
when 'D' | 'd' => result := x"D"; good := true;
when 'E' | 'e' => result := x"E"; good := true;
when 'F' | 'f' => result := x"F"; good := true;
when others =>
assert not ISSUE_ERROR report
"TEXTIO.HREAD Error: Read a '" & c &
"', expected a Hex character (0-F)." severity error;
GOOD := false;
end case;
end procedure Char2QuadBits;
procedure HREAD (L : inout LINE;
VALUE : out BIT_VECTOR;
GOOD : out BOOLEAN) is
variable ok : BOOLEAN;
variable c : CHARACTER;
constant ne : INTEGER := (VALUE'length+3)/4;
constant pad : INTEGER := ne*4 - VALUE'length;
variable sv : BIT_VECTOR (0 to ne*4 - 1) := (others => '0');
variable s : STRING(1 to ne-1);
begin
VALUE := (VALUE'range => '0');
loop -- skip white space
read(l, c, ok);
exit when (ok = false) or ((c /= ' ') and (c /= NBSP) and (c /= HT));
end loop;
-- Bail out if there was a bad read
if not ok then
GOOD := false;
return;
end if;
Char2QuadBits(c, sv(0 to 3), ok, false);
if not ok then
GOOD := false;
return;
end if;
read(L, s, ok);
if not ok then
GOOD := false;
return;
end if;
for i in 1 to ne-1 loop
Char2QuadBits(s(i), sv(4*i to 4*i+3), ok, false);
if not ok then
GOOD := false;
return;
end if;
end loop;
if or_reduce (sv (0 to pad-1)) = '1' then
GOOD := false; -- vector was truncated.
else
GOOD := true;
VALUE := sv (pad to sv'high);
end if;
end procedure HREAD;
procedure HREAD (L : inout LINE;
VALUE : out BIT_VECTOR) is
variable ok : BOOLEAN;
variable c : CHARACTER;
constant ne : INTEGER := (VALUE'length+3)/4;
constant pad : INTEGER := ne*4 - VALUE'length;
variable sv : BIT_VECTOR(0 to ne*4 - 1) := (others => '0');
variable s : STRING(1 to ne-1);
begin
VALUE := (VALUE'range => '0');
loop -- skip white space
read(l, c, ok);
exit when (ok = false) or ((c /= ' ') and (c /= NBSP) and (c /= HT));
end loop;
-- Bail out if there was a bad read
if not ok then
report "TEXTIO.HREAD Error: Failed skipping white space"
severity error;
return;
end if;
Char2QuadBits(c, sv(0 to 3), ok, true);
if not ok then
return;
end if;
read(L, s, ok);
if not ok then
report "TEXTIO.HREAD Error: Failed to read the STRING"
severity error;
return;
end if;
for i in 1 to ne-1 loop
Char2QuadBits(s(i), sv(4*i to 4*i+3), ok, true);
if not ok then
return;
end if;
end loop;
if or_reduce (sv (0 to pad-1)) = '1' then
report "TEXTIO.HREAD Error: Vector truncated"
severity error;
else
VALUE := sv (pad to sv'high);
end if;
end procedure HREAD;
procedure HWRITE (L : inout LINE;
VALUE : in BIT_VECTOR;
JUSTIFIED : in SIDE := right;
FIELD : in WIDTH := 0) is
begin
write (L => L,
VALUE => to_hstring(VALUE),
JUSTIFIED => JUSTIFIED,
FIELD => FIELD);
end procedure HWRITE;
-- Procedure only visible internally.
procedure Char2TriBits (C : CHARACTER;
RESULT : out BIT_VECTOR(2 downto 0);
GOOD : out BOOLEAN;
ISSUE_ERROR : in BOOLEAN) is
begin
case c is
when '0' => result := o"0"; good := true;
when '1' => result := o"1"; good := true;
when '2' => result := o"2"; good := true;
when '3' => result := o"3"; good := true;
when '4' => result := o"4"; good := true;
when '5' => result := o"5"; good := true;
when '6' => result := o"6"; good := true;
when '7' => result := o"7"; good := true;
when others =>
assert not ISSUE_ERROR
report
"TEXTIO.OREAD Error: Read a '" & c &
"', expected an Octal character (0-7)."
severity error;
GOOD := false;
end case;
end procedure Char2TriBits;
-- Read and Write procedures for Octal values
procedure OREAD (L : inout LINE;
VALUE : out BIT_VECTOR;
GOOD : out BOOLEAN) is
variable ok : BOOLEAN;
variable c : CHARACTER;
constant ne : INTEGER := (VALUE'length+2)/3;
constant pad : INTEGER := ne*3 - VALUE'length;
variable sv : BIT_VECTOR(0 to ne*3 - 1) := (others => '0');
variable s : STRING(1 to ne-1);
begin
VALUE := (VALUE'range => '0');
loop -- skip white space
read(l, c, ok);
exit when (ok = false) or ((c /= ' ') and (c /= NBSP) and (c /= HT));
end loop;
-- Bail out if there was a bad read
if not ok then
GOOD := false;
return;
end if;
Char2TriBits(c, sv(0 to 2), ok, false);
if not ok then
GOOD := false;
return;
end if;
read(L, s, ok);
if not ok then
GOOD := false;
return;
end if;
for i in 1 to ne-1 loop
Char2TriBits(s(i), sv(3*i to 3*i+2), ok, false);
if not ok then
GOOD := false;
return;
end if;
end loop;
if or_reduce (sv (0 to pad-1)) = '1' then
GOOD := false; -- vector was truncated.
else
GOOD := true;
VALUE := sv (pad to sv'high);
end if;
end procedure OREAD;
procedure OREAD (L : inout LINE;
VALUE : out BIT_VECTOR) is
variable c : CHARACTER;
variable ok : BOOLEAN;
constant ne : INTEGER := (VALUE'length+2)/3;
constant pad : INTEGER := ne*3 - VALUE'length;
variable sv : BIT_VECTOR(0 to ne*3 - 1) := (others => '0');
variable s : STRING(1 to ne-1);
begin
VALUE := (VALUE'range => '0');
loop -- skip white space
read(l, c, ok);
exit when (ok = false) or ((c /= ' ') and (c /= NBSP) and (c /= HT));
end loop;
-- Bail out if there was a bad read
if not ok then
report "TEXTIO.OREAD Error: Failed skipping white space"
severity error;
return;
end if;
Char2TriBits(c, sv(0 to 2), ok, true);
if not ok then
return;
end if;
read(L, s, ok);
if not ok then
report "TEXTIO.OREAD Error: Failed to read the STRING"
severity error;
return;
end if;
for i in 1 to ne-1 loop
Char2TriBits(s(i), sv(3*i to 3*i+2), ok, true);
if not ok then
return;
end if;
end loop;
if or_reduce (sv (0 to pad-1)) = '1' then
report "TEXTIO.OREAD Error: Vector truncated"
severity error;
else
VALUE := sv (pad to sv'high);
end if;
end procedure OREAD;
procedure OWRITE (L : inout LINE;
VALUE : in BIT_VECTOR;
JUSTIFIED : in SIDE := right;
FIELD : in WIDTH := 0) is
begin
write (L => L,
VALUE => to_ostring(VALUE),
JUSTIFIED => JUSTIFIED,
FIELD => FIELD);
end procedure OWRITE;
-- read and write for vector versions
-- These versions produce "value1, value2, value3 ...."
procedure read (L : inout LINE;
VALUE : out boolean_vector;
GOOD : out BOOLEAN) is
variable dummy : CHARACTER;
variable igood : BOOLEAN := true;
begin
for i in VALUE'range loop
read (L => L,
VALUE => VALUE(i),
GOOD => igood);
if (igood) and (i /= value'right) then
read (L => L,
VALUE => dummy, -- Toss the comma or seperator
good => igood);
end if;
if (not igood) then
good := false;
return;
end if;
end loop;
good := true;
end procedure read;
procedure read (L : inout LINE;
VALUE : out boolean_vector) is
variable dummy : CHARACTER;
variable igood : BOOLEAN;
begin
for i in VALUE'range loop
read (L => L,
VALUE => VALUE(i),
good => igood);
if (igood) and (i /= value'right) then
read (L => L,
VALUE => dummy, -- Toss the comma or seperator
good => igood);
end if;
if (not igood) then
report "STANDARD.STD_TEXTIO(BOOLEAN_VECTOR) "
& "Read error ecounted during vector read" severity error;
return;
end if;
end loop;
end procedure read;
procedure write (L : inout LINE;
VALUE : in boolean_vector;
JUSTIFIED : in SIDE := right;
FIELD : in WIDTH := 0) is
begin
for i in VALUE'range loop
write (L => L,
VALUE => VALUE(i),
JUSTIFIED => JUSTIFIED,
FIELD => FIELD);
if (i /= value'right) then
swrite (L, ", ");
end if;
end loop;
end procedure write;
procedure WRITE (L: inout LINE; VALUE: in REAL;
FORMAT: in STRING) is
begin
swrite ( L => L,
VALUE => to_string (VALUE, FORMAT));
end procedure WRITE;
function justify (
value : STRING;
justified : SIDE := right;
field : width := 0)
return STRING is
constant VAL_LEN : INTEGER := value'length;
variable result : STRING (1 to field) := (others => ' ');
begin -- function justify
-- return value if field is too small
if VAL_LEN >= field then
return value;
end if;
if justified = left then
result(1 to VAL_LEN) := value;
elsif justified = right then
result(field - VAL_LEN + 1 to field) := value;
end if;
return result;
end function justify;
function to_string (
VALUE : SIDE) return STRING is
begin
return SIDE'image(VALUE);
end function to_string;
-- pragma synthesis_on
-- Will be implicit
function minimum (L, R : SIDE) return SIDE is
begin
if L > R then return R;
else return L;
end if;
end function minimum;
function maximum (L, R : SIDE) return SIDE is
begin
if L > R then return L;
else return R;
end if;
end function maximum;
end package body standard_textio_additions;
|
------------------------------------------------------------------------------
-- "standard_textio_additions" package contains the additions to the built in
-- "standard.textio" package.
-- This package should be compiled into "ieee_proposed" and used as follows:
-- use ieee_proposed.standard_textio_additions.all;
-- Last Modified: $Date: 2007-03-13 14:25:58-04 $
-- RCS ID: $Id: standard_textio_additions_c.vhdl,v 1.5 2007-03-13 14:25:58-04 l435385 Exp $
--
-- Created for VHDL-200X par, David Bishop (dbishop@vhdl.org)
------------------------------------------------------------------------------
use std.textio.all;
package standard_textio_additions is
-- procedure DEALLOCATE (P : inout LINE);
procedure FLUSH (file F : TEXT);
function MINIMUM (L, R : SIDE) return SIDE;
function MAXIMUM (L, R : SIDE) return SIDE;
function TO_STRING (VALUE : SIDE) return STRING;
function JUSTIFY (VALUE : STRING; JUSTIFIED : SIDE := right; FIELD : WIDTH := 0) return STRING;
procedure SREAD (L : inout LINE; VALUE : out STRING; STRLEN : out NATURAL);
alias STRING_READ is SREAD [LINE, STRING, NATURAL];
alias BREAD is READ [LINE, BIT_VECTOR, BOOLEAN];
alias BREAD is READ [LINE, BIT_VECTOR];
alias BINARY_READ is READ [LINE, BIT_VECTOR, BOOLEAN];
alias BINARY_READ is READ [LINE, BIT_VECTOR];
procedure OREAD (L : inout LINE; VALUE : out BIT_VECTOR; GOOD : out BOOLEAN);
procedure OREAD (L : inout LINE; VALUE : out BIT_VECTOR);
alias OCTAL_READ is OREAD [LINE, BIT_VECTOR, BOOLEAN];
alias OCTAL_READ is OREAD [LINE, BIT_VECTOR];
procedure HREAD (L : inout LINE; VALUE : out BIT_VECTOR; GOOD : out BOOLEAN);
procedure HREAD (L : inout LINE; VALUE : out BIT_VECTOR);
alias HEX_READ is HREAD [LINE, BIT_VECTOR, BOOLEAN];
alias HEX_READ is HREAD [LINE, BIT_VECTOR];
procedure TEE (file F : TEXT; L : inout LINE);
procedure WRITE (L : inout LINE; VALUE : in REAL;
FORMAT : in STRING);
alias SWRITE is WRITE [LINE, STRING, SIDE, WIDTH];
alias STRING_WRITE is WRITE [LINE, STRING, SIDE, WIDTH];
alias BWRITE is WRITE [LINE, BIT_VECTOR, SIDE, WIDTH];
alias BINARY_WRITE is WRITE [LINE, BIT_VECTOR, SIDE, WIDTH];
procedure OWRITE (L : inout LINE; VALUE : in BIT_VECTOR;
JUSTIFIED : in SIDE := right; FIELD : in WIDTH := 0);
alias OCTAL_WRITE is OWRITE [LINE, BIT_VECTOR, SIDE, WIDTH];
procedure HWRITE (L : inout LINE; VALUE : in BIT_VECTOR;
JUSTIFIED : in SIDE := right; FIELD : in WIDTH := 0);
alias HEX_WRITE is HWRITE [LINE, BIT_VECTOR, SIDE, WIDTH];
end package standard_textio_additions;
library ieee_proposed;
use ieee_proposed.standard_additions.all;
package body standard_textio_additions is
-- pragma synthesis_off
constant NUS : STRING(2 to 1) := (others => ' '); -- NULL array
constant NBSP : CHARACTER := CHARACTER'val(160); -- space character
-- Writes L to a file without modifying the contents of the line
procedure TEE (file F : TEXT; L : inout LINE) is
begin
write (OUTPUT, L.all & LF);
writeline(F, L);
end procedure TEE;
procedure FLUSH (file F: TEXT) is -- Implicit
begin
file_close (F);
end procedure FLUSH;
-- Read and Write procedure for strings
procedure SREAD (L : inout LINE;
VALUE : out STRING;
STRLEN : out natural) is
variable ok : BOOLEAN;
variable c : CHARACTER;
-- Result is padded with space characters
variable result : STRING (1 to VALUE'length) := (others => ' ');
begin
VALUE := result;
loop -- skip white space
read(L, c, ok);
exit when (ok = false) or ((c /= ' ') and (c /= NBSP) and (c /= HT));
end loop;
-- Bail out if there was a bad read
if not ok then
STRLEN := 0;
return;
end if;
result (1) := c;
STRLEN := 1;
for i in 2 to VALUE'length loop
read(L, c, ok);
if (ok = false) or ((c = ' ') or (c = NBSP) or (c = HT)) then
exit;
else
result (i) := c;
end if;
STRLEN := i;
end loop;
VALUE := result;
end procedure SREAD;
-- Hex Read and Write procedures for bit_vector.
-- Procedure only visible internally.
procedure Char2QuadBits (C : CHARACTER;
RESULT : out BIT_VECTOR(3 downto 0);
GOOD : out BOOLEAN;
ISSUE_ERROR : in BOOLEAN) is
begin
case c is
when '0' => result := x"0"; good := true;
when '1' => result := x"1"; good := true;
when '2' => result := x"2"; good := true;
when '3' => result := x"3"; good := true;
when '4' => result := x"4"; good := true;
when '5' => result := x"5"; good := true;
when '6' => result := x"6"; good := true;
when '7' => result := x"7"; good := true;
when '8' => result := x"8"; good := true;
when '9' => result := x"9"; good := true;
when 'A' | 'a' => result := x"A"; good := true;
when 'B' | 'b' => result := x"B"; good := true;
when 'C' | 'c' => result := x"C"; good := true;
when 'D' | 'd' => result := x"D"; good := true;
when 'E' | 'e' => result := x"E"; good := true;
when 'F' | 'f' => result := x"F"; good := true;
when others =>
assert not ISSUE_ERROR report
"TEXTIO.HREAD Error: Read a '" & c &
"', expected a Hex character (0-F)." severity error;
GOOD := false;
end case;
end procedure Char2QuadBits;
procedure HREAD (L : inout LINE;
VALUE : out BIT_VECTOR;
GOOD : out BOOLEAN) is
variable ok : BOOLEAN;
variable c : CHARACTER;
constant ne : INTEGER := (VALUE'length+3)/4;
constant pad : INTEGER := ne*4 - VALUE'length;
variable sv : BIT_VECTOR (0 to ne*4 - 1) := (others => '0');
variable s : STRING(1 to ne-1);
begin
VALUE := (VALUE'range => '0');
loop -- skip white space
read(l, c, ok);
exit when (ok = false) or ((c /= ' ') and (c /= NBSP) and (c /= HT));
end loop;
-- Bail out if there was a bad read
if not ok then
GOOD := false;
return;
end if;
Char2QuadBits(c, sv(0 to 3), ok, false);
if not ok then
GOOD := false;
return;
end if;
read(L, s, ok);
if not ok then
GOOD := false;
return;
end if;
for i in 1 to ne-1 loop
Char2QuadBits(s(i), sv(4*i to 4*i+3), ok, false);
if not ok then
GOOD := false;
return;
end if;
end loop;
if or_reduce (sv (0 to pad-1)) = '1' then
GOOD := false; -- vector was truncated.
else
GOOD := true;
VALUE := sv (pad to sv'high);
end if;
end procedure HREAD;
procedure HREAD (L : inout LINE;
VALUE : out BIT_VECTOR) is
variable ok : BOOLEAN;
variable c : CHARACTER;
constant ne : INTEGER := (VALUE'length+3)/4;
constant pad : INTEGER := ne*4 - VALUE'length;
variable sv : BIT_VECTOR(0 to ne*4 - 1) := (others => '0');
variable s : STRING(1 to ne-1);
begin
VALUE := (VALUE'range => '0');
loop -- skip white space
read(l, c, ok);
exit when (ok = false) or ((c /= ' ') and (c /= NBSP) and (c /= HT));
end loop;
-- Bail out if there was a bad read
if not ok then
report "TEXTIO.HREAD Error: Failed skipping white space"
severity error;
return;
end if;
Char2QuadBits(c, sv(0 to 3), ok, true);
if not ok then
return;
end if;
read(L, s, ok);
if not ok then
report "TEXTIO.HREAD Error: Failed to read the STRING"
severity error;
return;
end if;
for i in 1 to ne-1 loop
Char2QuadBits(s(i), sv(4*i to 4*i+3), ok, true);
if not ok then
return;
end if;
end loop;
if or_reduce (sv (0 to pad-1)) = '1' then
report "TEXTIO.HREAD Error: Vector truncated"
severity error;
else
VALUE := sv (pad to sv'high);
end if;
end procedure HREAD;
procedure HWRITE (L : inout LINE;
VALUE : in BIT_VECTOR;
JUSTIFIED : in SIDE := right;
FIELD : in WIDTH := 0) is
begin
write (L => L,
VALUE => to_hstring(VALUE),
JUSTIFIED => JUSTIFIED,
FIELD => FIELD);
end procedure HWRITE;
-- Procedure only visible internally.
procedure Char2TriBits (C : CHARACTER;
RESULT : out BIT_VECTOR(2 downto 0);
GOOD : out BOOLEAN;
ISSUE_ERROR : in BOOLEAN) is
begin
case c is
when '0' => result := o"0"; good := true;
when '1' => result := o"1"; good := true;
when '2' => result := o"2"; good := true;
when '3' => result := o"3"; good := true;
when '4' => result := o"4"; good := true;
when '5' => result := o"5"; good := true;
when '6' => result := o"6"; good := true;
when '7' => result := o"7"; good := true;
when others =>
assert not ISSUE_ERROR
report
"TEXTIO.OREAD Error: Read a '" & c &
"', expected an Octal character (0-7)."
severity error;
GOOD := false;
end case;
end procedure Char2TriBits;
-- Read and Write procedures for Octal values
procedure OREAD (L : inout LINE;
VALUE : out BIT_VECTOR;
GOOD : out BOOLEAN) is
variable ok : BOOLEAN;
variable c : CHARACTER;
constant ne : INTEGER := (VALUE'length+2)/3;
constant pad : INTEGER := ne*3 - VALUE'length;
variable sv : BIT_VECTOR(0 to ne*3 - 1) := (others => '0');
variable s : STRING(1 to ne-1);
begin
VALUE := (VALUE'range => '0');
loop -- skip white space
read(l, c, ok);
exit when (ok = false) or ((c /= ' ') and (c /= NBSP) and (c /= HT));
end loop;
-- Bail out if there was a bad read
if not ok then
GOOD := false;
return;
end if;
Char2TriBits(c, sv(0 to 2), ok, false);
if not ok then
GOOD := false;
return;
end if;
read(L, s, ok);
if not ok then
GOOD := false;
return;
end if;
for i in 1 to ne-1 loop
Char2TriBits(s(i), sv(3*i to 3*i+2), ok, false);
if not ok then
GOOD := false;
return;
end if;
end loop;
if or_reduce (sv (0 to pad-1)) = '1' then
GOOD := false; -- vector was truncated.
else
GOOD := true;
VALUE := sv (pad to sv'high);
end if;
end procedure OREAD;
procedure OREAD (L : inout LINE;
VALUE : out BIT_VECTOR) is
variable c : CHARACTER;
variable ok : BOOLEAN;
constant ne : INTEGER := (VALUE'length+2)/3;
constant pad : INTEGER := ne*3 - VALUE'length;
variable sv : BIT_VECTOR(0 to ne*3 - 1) := (others => '0');
variable s : STRING(1 to ne-1);
begin
VALUE := (VALUE'range => '0');
loop -- skip white space
read(l, c, ok);
exit when (ok = false) or ((c /= ' ') and (c /= NBSP) and (c /= HT));
end loop;
-- Bail out if there was a bad read
if not ok then
report "TEXTIO.OREAD Error: Failed skipping white space"
severity error;
return;
end if;
Char2TriBits(c, sv(0 to 2), ok, true);
if not ok then
return;
end if;
read(L, s, ok);
if not ok then
report "TEXTIO.OREAD Error: Failed to read the STRING"
severity error;
return;
end if;
for i in 1 to ne-1 loop
Char2TriBits(s(i), sv(3*i to 3*i+2), ok, true);
if not ok then
return;
end if;
end loop;
if or_reduce (sv (0 to pad-1)) = '1' then
report "TEXTIO.OREAD Error: Vector truncated"
severity error;
else
VALUE := sv (pad to sv'high);
end if;
end procedure OREAD;
procedure OWRITE (L : inout LINE;
VALUE : in BIT_VECTOR;
JUSTIFIED : in SIDE := right;
FIELD : in WIDTH := 0) is
begin
write (L => L,
VALUE => to_ostring(VALUE),
JUSTIFIED => JUSTIFIED,
FIELD => FIELD);
end procedure OWRITE;
-- read and write for vector versions
-- These versions produce "value1, value2, value3 ...."
procedure read (L : inout LINE;
VALUE : out boolean_vector;
GOOD : out BOOLEAN) is
variable dummy : CHARACTER;
variable igood : BOOLEAN := true;
begin
for i in VALUE'range loop
read (L => L,
VALUE => VALUE(i),
GOOD => igood);
if (igood) and (i /= value'right) then
read (L => L,
VALUE => dummy, -- Toss the comma or seperator
good => igood);
end if;
if (not igood) then
good := false;
return;
end if;
end loop;
good := true;
end procedure read;
procedure read (L : inout LINE;
VALUE : out boolean_vector) is
variable dummy : CHARACTER;
variable igood : BOOLEAN;
begin
for i in VALUE'range loop
read (L => L,
VALUE => VALUE(i),
good => igood);
if (igood) and (i /= value'right) then
read (L => L,
VALUE => dummy, -- Toss the comma or seperator
good => igood);
end if;
if (not igood) then
report "STANDARD.STD_TEXTIO(BOOLEAN_VECTOR) "
& "Read error ecounted during vector read" severity error;
return;
end if;
end loop;
end procedure read;
procedure write (L : inout LINE;
VALUE : in boolean_vector;
JUSTIFIED : in SIDE := right;
FIELD : in WIDTH := 0) is
begin
for i in VALUE'range loop
write (L => L,
VALUE => VALUE(i),
JUSTIFIED => JUSTIFIED,
FIELD => FIELD);
if (i /= value'right) then
swrite (L, ", ");
end if;
end loop;
end procedure write;
procedure WRITE (L: inout LINE; VALUE: in REAL;
FORMAT: in STRING) is
begin
swrite ( L => L,
VALUE => to_string (VALUE, FORMAT));
end procedure WRITE;
function justify (
value : STRING;
justified : SIDE := right;
field : width := 0)
return STRING is
constant VAL_LEN : INTEGER := value'length;
variable result : STRING (1 to field) := (others => ' ');
begin -- function justify
-- return value if field is too small
if VAL_LEN >= field then
return value;
end if;
if justified = left then
result(1 to VAL_LEN) := value;
elsif justified = right then
result(field - VAL_LEN + 1 to field) := value;
end if;
return result;
end function justify;
function to_string (
VALUE : SIDE) return STRING is
begin
return SIDE'image(VALUE);
end function to_string;
-- pragma synthesis_on
-- Will be implicit
function minimum (L, R : SIDE) return SIDE is
begin
if L > R then return R;
else return L;
end if;
end function minimum;
function maximum (L, R : SIDE) return SIDE is
begin
if L > R then return L;
else return R;
end if;
end function maximum;
end package body standard_textio_additions;
|
----------------------------------------------------------------------------------
-- Company:
-- Engineer:
--
-- Create Date: 16:20:00 10/21/2014
-- Design Name:
-- Module Name: FileReader - arc1
-- Project Name:
-- Target Devices:
-- Tool versions:
-- Description:
--
-- Dependencies:
--
-- Revision:
-- Revision 0.01 - File Created
-- Additional Comments:
--
----------------------------------------------------------------------------------
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
-- Uncomment the following library declaration if using
-- arithmetic functions with Signed or Unsigned values
use IEEE.NUMERIC_STD.ALL;
-- Uncomment the following library declaration if instantiating
-- any Xilinx primitives in this code.
--library UNISIM;
--use UNISIM.VComponents.all;
use STD.TEXTIO.ALL; -- utilisation de fichiers
ENTITY FileReader is
Port ( clk : in STD_LOGIC;
input_file : in file;
R0 : out STD_LOGIC_VECTOR(31 downto 0);
R1 : out STD_LOGIC_VECTOR(31 downto 0);
R2 : out STD_LOGIC_VECTOR(31 downto 0)
);
END FileReader;
ARCHITECTURE arc1 of FileReader is
READING : PROCESS
variable input_line: line; -- le type LINE est un pointeur
file input_file: text open READ_MODE is "entrees.dat"; -- fichier spécifié
variable input_value0: bit_vector(31 downto 0); -- variables à lire
variable input_value0: bit_vector(31 downto 0); -- variables à lire
variable input_value0: bit_vector(31 downto 0); -- variables à lire
BEGIN
readline(input_file, input_line); -- new line read from the input file
read(input_line, input_value); -- new vector read from the input line
R0 <= input_value0 ;
readline(input_file, input_line); -- new line read from the input file
read(input_line, input_value1); -- new vector read from the input line
R1 <= input_value1 ;
readline(input_file, input_line); -- new line read from the input file
read(input_line, input_value2); -- new vector read from the input line
R2 <= input_value2 ;
END PROCESS READING;
END arc1;
|
----------------------------------------------------------------------------------
-- Company:
-- Engineer:
--
-- Create Date: 16:44:00 11/09/2017
-- Design Name:
-- Module Name: Mux2 - Behavioral
-- Project Name:
-- Target Devices:
-- Tool versions:
-- Description:
--
-- Dependencies:
--
-- Revision:
-- Revision 0.01 - File Created
-- Additional Comments:
--
----------------------------------------------------------------------------------
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
-- Uncomment the following library declaration if using
-- arithmetic functions with Signed or Unsigned values
--use IEEE.NUMERIC_STD.ALL;
-- Uncomment the following library declaration if instantiating
-- any Xilinx primitives in this code.
--library UNISIM;
--use UNISIM.VComponents.all;
entity Mux2 is
Port ( Entrada : in STD_LOGIC_VECTOR (31 downto 0);
sumador : in STD_LOGIC_VECTOR (31 downto 0);
Cuentrada : in STD_LOGIC_VECTOR (1 downto 0);
posicion : out STD_LOGIC_VECTOR (31 downto 0));
end Mux2;
architecture Behavioral of Mux2 is
begin
process(Entrada,sumador,Cuentrada)
begin
if (Cuentrada="10") then
posicion<=sumador;
elsif (Cuentrada="00" or Cuentrada="01" or Cuentrada="11") then
posicion<=Entrada;
end if;
end process;
end Behavioral;
|
entity FIFO is
generic (
g_width : integer := 256;
g_depth : integer := 32;
PREFIX_generic_SUFFIX : integer := 20
);
port (
I_PORT1 : in std_logic;
I_PORT2 : out std_logic
);
end entity FIFO;
entity FIFO is
generic (
g_width : integer := 256;
g_depth : integer := 32;
PREFIX_generic_SUFFIX : integer := 20
);
port (
I_PORT1 : in std_logic;
I_PORT2 : out std_logic
);
end entity FIFO;
entity FIFO is
generic (
g_width : integer := 256;
g_depth : integer := 32;
PREFIX_generic_SUFFIX : integer := 20
);
port (
I_PORT1 : in std_logic;
I_PORT2 : out std_logic
);
end entity FIFO;
entity FIFO is
generic (
g_width : integer := 256;
g_depth : integer := 32;
PREFIX_generic_SUFFIX : integer := 20
);
port (
I_PORT1 : in std_logic;
I_PORT2 : out std_logic
);
end entity FIFO;
entity FIFO is
generic(g_size : integer := 10;
g_width : integer := 256;
g_depth : integer := 32;
PREFIX_generic_SUFFIX : integer := 20
);
port (
i_port1 : in std_logic := '0';
i_port2 : out std_logic :='1'
);
end entity FIFO;
entity FIFO is
generic(g_size : integer := 10;
g_width : integer := 256;
g_depth : integer := 32;
PREFIX_generic_SUFFIX : integer := 20
);
port (
i_port1 : in std_logic := '0';
i_port2 : out std_logic :='1'
);
end entity FIFO;
entity FIFO is
generic(g_size : integer := 10;
g_width : integer := 256;
g_depth : integer := 32;
PREFIX_generic_SUFFIX : integer := 20
);
port (
i_port1 : in std_logic := '0';
i_port2 : out std_logic :='1'
);
end entity FIFO;
entity FIFO is
generic(g_size : integer := 10;
g_width : integer := 256;
g_depth : integer := 32;
PREFIX_generic_SUFFIX : integer := 20
);
port (
i_port1 : in std_logic := '0';
i_port2 : out std_logic :='1'
);
end entity FIFO;
|
--------------------------------------------------------------------------------
--! @file pulse2pulse.vhd
--! @brief Drive a pulse from one clock domain to another.
--!
--! Regardless of the duration of pulsein, the pulseout will be one out_clk
--! cycle wide and synchronized to out_clk. pulsein has to be synchronized to
--! in_clk already.
--------------------------------------------------------------------------------
library ieee;
use ieee.std_logic_1164.all ;
use ieee.std_logic_arith.all ;
use ieee.std_logic_unsigned.all ;
use ieee.std_logic_misc.all ;
--! A module that drive a pulse from one clock domain to another.
--! Regardless of the duration of pulsein, the pulseout will be one out_clk
--! cycle wide and synchronized to out_clk. pulsein has to be synchronized to
--! in_clk already.
entity pulse2pulse is
port (
in_clk :in std_logic; --! input clock
out_clk :in std_logic; --! output clock
rst :in std_logic; --! reset
pulsein :in std_logic; --! input pulse which is synchronized to in_clk
inbusy :out std_logic; --! notify input side that output is not ready yet
pulseout :out std_logic --! one out_clk wide output pulse, synchronized to out_clk
);
end pulse2pulse;
architecture syn of pulse2pulse is
-----------------------------------------------------------------------------------
--constant declarations
-----------------------------------------------------------------------------------
-----------------------------------------------------------------------------------
--constant declarations
-----------------------------------------------------------------------------------
-----------------------------------------------------------------------------------
--signal declarations
-----------------------------------------------------------------------------------
ATTRIBUTE async_reg : string;
SIGNAL out_set : std_logic;
ATTRIBUTE async_reg OF out_set : SIGNAL IS "true";
SIGNAL out_set_prev : std_logic;
ATTRIBUTE async_reg OF out_set_prev : SIGNAL IS "true";
SIGNAL out_set_prev2 : std_logic;
ATTRIBUTE async_reg OF out_set_prev2 : SIGNAL IS "true";
SIGNAL in_set : std_logic;
ATTRIBUTE async_reg OF in_set : SIGNAL IS "true";
SIGNAL outreset : std_logic;
ATTRIBUTE async_reg OF outreset : SIGNAL IS "true";
SIGNAL in_reset : std_logic;
ATTRIBUTE async_reg OF in_reset : SIGNAL IS "true";
SIGNAL in_reset_prev : std_logic;
ATTRIBUTE async_reg OF in_reset_prev : SIGNAL IS "true";
SIGNAL in_reset_prev2 : std_logic;
ATTRIBUTE async_reg OF in_reset_prev2 : SIGNAL IS "true";
-----------------------------------------------------------------------------------
--component declarations
-----------------------------------------------------------------------------------
--*********************************************************************************
begin
--*********************************************************************************
-----------------------------------------------------------------------------------
--component instantiations
-----------------------------------------------------------------------------------
-----------------------------------------------------------------------------------
--synchronous processes
-----------------------------------------------------------------------------------
in_proc:process(in_clk,rst)
begin
if(rst = '1') then
in_reset <= '0';
in_reset_prev <= '0';
in_reset_prev2<= '0';
in_set <= '0';
elsif(in_clk'event and in_clk = '1') then
--regitser a pulse on the pulse in port
--reset the signal when the ouput has registerred the pulse
if (in_reset_prev = '1' and in_reset_prev2 = '1') then
in_set <= '0';
elsif (pulsein = '1') then
in_set <= '1';
end if;
--register the reset signal from the other clock domain
--three times. double stage synchronising circuit
--reduces the MTB
in_reset <= outreset;
in_reset_prev <= in_reset;
in_reset_prev2 <= in_reset_prev;
end if;
end process in_proc;
out_proc:process(out_clk,rst)
begin
if(rst = '1') then
out_set <= '0';
out_set_prev <= '0';
out_set_prev2 <= '0';
outreset <= '0';
pulseout <= '0';
elsif(out_clk'event and out_clk = '1') then
--generate a pulse on the output when the
--set signal has travelled through the synchronising fip flops
if (out_set_prev = '1' and out_set_prev2 = '0') then
pulseout <= '1';
else
pulseout <= '0';
end if;
--feedback the corret reception of the set signal to reset the set pulse
if (out_set_prev = '1' and out_set_prev2 = '1') then
outreset <= '1';
elsif (out_set_prev = '0' and out_set_prev2 = '0') then
outreset <= '0';
end if;
--register the reset signal from the other clock domain
--three times. double stage synchronising circuit
--reduces the MTB
out_set <= in_set;
out_set_prev <= out_set;
out_set_prev2 <= out_set_prev;
end if;
end process out_proc;
-----------------------------------------------------------------------------------
--asynchronous processes
-----------------------------------------------------------------------------------
-----------------------------------------------------------------------------------
--asynchronous mapping
-----------------------------------------------------------------------------------
inbusy <= in_set or in_reset_prev;
-------------------
-------------------
end syn;
|
-- Module Name: InputGate - Behavioral
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
USE ieee.std_logic_unsigned.ALL;
entIty InputGate is
Generic (
wSize :integer := 9;
hSize :integer := 9;
imgWidth : integer := 512; -- Largeur de l'image
imgHeight : integer := 512); -- Hauteur de l'image
Port ( Clk : in STD_LOGIC;
PxClk : in STD_LOGIC;
PxVal : in STD_LOGIC;
a: in std_logic_vector (5 downto 0);
b : in std_logic_vector(5 downto 0);
c: in std_logic_vector(5 downto 0);
d : in std_logic_vector (5 downto 0);
PxValOut : out STD_LOGIC;
Lig : out std_logic_vector (wSize-1 downto 0);
Lig32 : out std_logic_vector (3 to long_wSize-1);
Col : out std_logic_vector (1 to 8);
StatusInner : out std_logic;
daInOut!@g : inout std_logic_vector (134 downto 7);
FirstPass : out std_logic := '0');
end InputGate;
architecture Behavioral of InputGate is
CONSTANT LargeurBits : integer :=wSize;
CONSTANT HauteurBits : integer :=hSize;
COMPONENT AccessManager IS
generic (
hBusSize : integer range 0 to 11;
vBusSize : integer range 0 to 11;
imgWidth : integer range 0 to 1920;
imgHeight : integer range 0 to 1080
);
port (
C_Add : in std_logic_vector (hBusSize-1 downto 0);
L_Add : in std_logic_vector (0 to vBusSize-1);
StatusInner : out std_logic;
UpLeftCorner : out std_logic;
FirstLine : out std_logic;
FirstRow : out std_logic;
LastRow : out std_logic;
LastPixel : out std_logic
);
END COMPONENT;
signal CleanPxClk : std_logic :='0';
SIGNAL C_Add : std_logic_vector (LargeurBits-1 downto 0) := (others=>'0');
SIGNAL L_Add : std_logic_vector (HauteurBits-1 downto 0) := (others=>'0');
SIGNAL SigLastRow : std_logic := '0';
SIGNAL SigLastPixel : std_logic := '0';
SIGNAL fPass : std_logic := '1';
begin
AM1: AccessManager GENERIC MAP(
hBusSize => LargeurBits,
vBusSize => HauteurBits,
imgWidth => imgWidth,
imgHeight => imgHeight
)
PORT MAP(
C_Add => C_Add,
L_Add => L_Add,
StatusInner => StatusInner,
UpLeftCorner => UpLeftCorner,
FirstLine => FirstLine,
FirstRow => FirstRow,
LastRow => SigLastRow ,
LastPixel => SigLastPixel
);
PxClkEventManager: process(Clk)
variable flag : std_logic := '1';
begin
if Clk'Event and Clk='1' then
if (PxClk = '1' and flag = '0') then CleanPxClk <='1';
flag:='1';
elsif PxClk = '0' then flag:='0';
CleanPxClk <='0';
elsif PxClk = '1' and flag = '1' then CleanPxClk <='0';
flag:='1';
end if;
end if;
end process;
FirstPass <= fPass;
PixelCounter: process(Clk)
variable flag : std_logic := '1';
variable flagPass : std_logic := '0';
begin
if Clk'Event and Clk='1' then
if CleanPxClk = '1' then
if SigLastRow='1' then C_Add <= (others=>'0');
if SigLastPixel ='1' then L_Add <= (others=>'0');
if flagPass = '0' then fPass <= '0';
flagPass := '1';
else fPass <= '1';
flagPass := '0';
end if;
else L_Add <= L_Add + 1;
end if;
else C_Add <= C_Add + 1;
end if;
end if;
end if;
end process;
Col <= C_Add;
Lig <= L_Add;
LastRow <= SigLastRow;
LastPixel <= SigLastPixel;
PxValOut <= PxVal;
end Behavioral;
|
--
-- Grain128 datapath, faster but larger implementation
--
--
--
library IEEE;
use IEEE.std_logic_1164.all;
use IEEE.numeric_std.all;
entity grain128_datapath_fast is
generic (
DEBUG : boolean := false -- output debug information
);
port (
CLK_I : in std_logic;
CLKEN_I : in std_logic := '1';
ARESET_I : in std_logic;
KEY_I : in std_logic;
IV_I : in std_logic;
INJECT_INPUT_I : in std_logic;
PAD_IV_I : in std_logic;
ADD_OUTPUT_I : in std_logic;
H_O : out std_logic
);
end entity;
architecture behav of grain128_datapath_fast is
-- On Altera devices, this will make things bigger but also faster
-- by stopping Quartus from using memories instead of shift registers
-- (since Altera lacks SLR16 primitives, puh!)
attribute altera_attribute : string;
attribute altera_attribute of behav : architecture is "-name AUTO_SHIFT_REGISTER_RECOGNITION OFF";
signal lfsr, nfsr : unsigned(0 to 127);
signal func_h, func_g, func_f : std_logic;
signal tmp1, tmp2, tmp3, tmp4, tmp5 : std_logic;
begin
-- outputs:
H_O <= func_h;
-- register balancing:
-- usualy, you can (should) leave this to the
-- synthesizer which does a much better job
func_h <= tmp1 xor tmp2;
func_g <= tmp3 xor tmp4;
func_f <= tmp5;
retime_proc: process(CLK_I)
begin
if rising_edge(CLK_I) then
if CLKEN_I = '1' then
tmp1 <= nfsr(37) xor nfsr(46) xor nfsr(65) xor nfsr(74) xor nfsr(90) xor lfsr(94) xor (nfsr(13) and lfsr(9)) xor (lfsr(14) and lfsr(21));
tmp2 <= nfsr(3) xor nfsr(16) xor (nfsr(96) and lfsr(43)) xor (lfsr(61) and lfsr(80)) xor (nfsr(13) and nfsr(96) and lfsr(96));
tmp3 <= nfsr(27) xor nfsr(57) xor nfsr(92) xor nfsr(97) xor (nfsr(4) and nfsr(68)) xor (nfsr(12) and nfsr(14)) xor (nfsr(18) and nfsr(19));
tmp4 <= lfsr(1) xor nfsr(1) xor (nfsr(28) and nfsr(60)) xor (nfsr(41) and nfsr(49)) xor (nfsr(62) and nfsr(66)) xor (nfsr(69) and nfsr(85));
tmp5 <= lfsr(1) xor lfsr(8) xor lfsr(39) xor lfsr(71) xor lfsr(82) xor lfsr(97);
end if;
end if;
end process;
-- the shift registers:
sr_proc : process(CLK_I)
begin
if rising_edge(CLK_I) then
if CLKEN_I = '1' then
lfsr <= lfsr sll 1;
nfsr <= nfsr sll 1;
if INJECT_INPUT_I = '1' then
lfsr(127) <= IV_I or PAD_IV_I;
nfsr(127) <= KEY_I;
else
lfsr(127) <= func_f xor (ADD_OUTPUT_I and func_h);
nfsr(127) <= func_g xor (ADD_OUTPUT_I and func_h);
end if;
end if;
end if;
end process;
end behav;
|
package pack is
constant k : integer := 1 / 0; -- Error
function is_even (x : integer) return boolean;
end package;
package body pack is
function is_even (x : integer) return boolean is
begin
return (x rem 2) = 0;
end function;
end package body;
-------------------------------------------------------------------------------
entity link1 is
end entity;
use work.pack.all;
architecture test of link1 is
begin
g: if is_even(4) generate
begin
p1: process is
begin
report "hello";
wait;
end process;
end generate;
end architecture;
|
library ieee;
use ieee.std_logic_1164.all;
entity var01c is
port (clk : std_logic;
mask : std_logic_vector (1 downto 0);
val : std_logic_vector (1 downto 0);
res : out std_logic_vector (3 downto 0));
end var01c;
architecture behav of var01c is
begin
process (clk)
variable hi, lo : natural;
begin
if rising_edge (clk) then
for i in 0 to 1 loop
if mask (i) = '1' then
lo := i * 2;
hi := lo + 1;
res (hi downto lo) <= val;
end if;
end loop;
end if;
end process;
end behav;
|
-- Copyright 1986-2017 Xilinx, Inc. All Rights Reserved.
-- --------------------------------------------------------------------------------
-- Tool Version: Vivado v.2017.2 (win64) Build 1909853 Thu Jun 15 18:39:09 MDT 2017
-- Date : Tue Sep 19 00:29:40 2017
-- Host : DarkCube running 64-bit major release (build 9200)
-- Command : write_vhdl -force -mode synth_stub -rename_top decalper_eb_ot_sdeen_pot_pi_dehcac_xnilix -prefix
-- decalper_eb_ot_sdeen_pot_pi_dehcac_xnilix_ zynq_design_1_rst_ps7_0_100M_1_stub.vhdl
-- Design : zynq_design_1_rst_ps7_0_100M_1
-- Purpose : Stub declaration of top-level module interface
-- Device : xc7z020clg484-1
-- --------------------------------------------------------------------------------
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
entity decalper_eb_ot_sdeen_pot_pi_dehcac_xnilix is
Port (
slowest_sync_clk : in STD_LOGIC;
ext_reset_in : in STD_LOGIC;
aux_reset_in : in STD_LOGIC;
mb_debug_sys_rst : in STD_LOGIC;
dcm_locked : in STD_LOGIC;
mb_reset : out STD_LOGIC;
bus_struct_reset : out STD_LOGIC_VECTOR ( 0 to 0 );
peripheral_reset : out STD_LOGIC_VECTOR ( 0 to 0 );
interconnect_aresetn : out STD_LOGIC_VECTOR ( 0 to 0 );
peripheral_aresetn : out STD_LOGIC_VECTOR ( 0 to 0 )
);
end decalper_eb_ot_sdeen_pot_pi_dehcac_xnilix;
architecture stub of decalper_eb_ot_sdeen_pot_pi_dehcac_xnilix is
attribute syn_black_box : boolean;
attribute black_box_pad_pin : string;
attribute syn_black_box of stub : architecture is true;
attribute black_box_pad_pin of stub : architecture is "slowest_sync_clk,ext_reset_in,aux_reset_in,mb_debug_sys_rst,dcm_locked,mb_reset,bus_struct_reset[0:0],peripheral_reset[0:0],interconnect_aresetn[0:0],peripheral_aresetn[0:0]";
attribute x_core_info : string;
attribute x_core_info of stub : architecture is "proc_sys_reset,Vivado 2017.2";
begin
end;
|
-- Copyright (C) 2001 Bill Billowitch.
-- Some of the work to develop this test suite was done with Air Force
-- support. The Air Force and Bill Billowitch assume no
-- responsibilities for this software.
-- This file is part of VESTs (Vhdl tESTs).
-- VESTs is free software; you can redistribute it and/or modify it
-- under the terms of the GNU General Public License as published by the
-- Free Software Foundation; either version 2 of the License, or (at
-- your option) any later version.
-- VESTs is distributed in the hope that it will be useful, but WITHOUT
-- ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
-- FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
-- for more details.
-- You should have received a copy of the GNU General Public License
-- along with VESTs; if not, write to the Free Software Foundation,
-- Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
-- ---------------------------------------------------------------------
--
-- $Id: tc2169.vhd,v 1.2 2001-10-26 16:29:46 paw Exp $
-- $Revision: 1.2 $
--
-- ---------------------------------------------------------------------
ENTITY c07s02b04x00p22n01i02169ent IS
END c07s02b04x00p22n01i02169ent;
ARCHITECTURE c07s02b04x00p22n01i02169arch OF c07s02b04x00p22n01i02169ent IS
TYPE severity_level_v is array (integer range <>) of severity_level;
SUBTYPE severity_level_8 is severity_level_v (1 to 8);
SUBTYPE severity_level_4 is severity_level_v (1 to 4);
BEGIN
TESTING: PROCESS
variable result : severity_level_4;
variable l_operand : severity_level_4 := ( NOTE , FAILURE , NOTE , FAILURE );
variable r_operand : severity_level_4 := ( FAILURE , FAILURE , NOTE , NOTE );
alias l_alias : severity_level_v (1 to 2) is l_operand (2 to 3);
alias r_alias : severity_level_v (1 to 2) is r_operand (3 to 4);
BEGIN
result := l_alias & r_alias;
wait for 5 ns;
assert NOT(( result = ( FAILURE , NOTE , NOTE , NOTE )) and ( result(1) = FAILURE ))
report "***PASSED TEST: c07s02b04x00p22n01i02169"
severity NOTE;
assert (( result = ( FAILURE , NOTE , NOTE , NOTE )) and ( result(1) = FAILURE ))
report "***FAILED TEST: c07s02b04x00p22n01i02169 - Concatenation of two SEVERITY_LEVEL aliases failed."
severity ERROR;
wait;
END PROCESS TESTING;
END c07s02b04x00p22n01i02169arch;
|
-- Copyright (C) 2001 Bill Billowitch.
-- Some of the work to develop this test suite was done with Air Force
-- support. The Air Force and Bill Billowitch assume no
-- responsibilities for this software.
-- This file is part of VESTs (Vhdl tESTs).
-- VESTs is free software; you can redistribute it and/or modify it
-- under the terms of the GNU General Public License as published by the
-- Free Software Foundation; either version 2 of the License, or (at
-- your option) any later version.
-- VESTs is distributed in the hope that it will be useful, but WITHOUT
-- ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
-- FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
-- for more details.
-- You should have received a copy of the GNU General Public License
-- along with VESTs; if not, write to the Free Software Foundation,
-- Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
-- ---------------------------------------------------------------------
--
-- $Id: tc2169.vhd,v 1.2 2001-10-26 16:29:46 paw Exp $
-- $Revision: 1.2 $
--
-- ---------------------------------------------------------------------
ENTITY c07s02b04x00p22n01i02169ent IS
END c07s02b04x00p22n01i02169ent;
ARCHITECTURE c07s02b04x00p22n01i02169arch OF c07s02b04x00p22n01i02169ent IS
TYPE severity_level_v is array (integer range <>) of severity_level;
SUBTYPE severity_level_8 is severity_level_v (1 to 8);
SUBTYPE severity_level_4 is severity_level_v (1 to 4);
BEGIN
TESTING: PROCESS
variable result : severity_level_4;
variable l_operand : severity_level_4 := ( NOTE , FAILURE , NOTE , FAILURE );
variable r_operand : severity_level_4 := ( FAILURE , FAILURE , NOTE , NOTE );
alias l_alias : severity_level_v (1 to 2) is l_operand (2 to 3);
alias r_alias : severity_level_v (1 to 2) is r_operand (3 to 4);
BEGIN
result := l_alias & r_alias;
wait for 5 ns;
assert NOT(( result = ( FAILURE , NOTE , NOTE , NOTE )) and ( result(1) = FAILURE ))
report "***PASSED TEST: c07s02b04x00p22n01i02169"
severity NOTE;
assert (( result = ( FAILURE , NOTE , NOTE , NOTE )) and ( result(1) = FAILURE ))
report "***FAILED TEST: c07s02b04x00p22n01i02169 - Concatenation of two SEVERITY_LEVEL aliases failed."
severity ERROR;
wait;
END PROCESS TESTING;
END c07s02b04x00p22n01i02169arch;
|
-- Copyright (C) 2001 Bill Billowitch.
-- Some of the work to develop this test suite was done with Air Force
-- support. The Air Force and Bill Billowitch assume no
-- responsibilities for this software.
-- This file is part of VESTs (Vhdl tESTs).
-- VESTs is free software; you can redistribute it and/or modify it
-- under the terms of the GNU General Public License as published by the
-- Free Software Foundation; either version 2 of the License, or (at
-- your option) any later version.
-- VESTs is distributed in the hope that it will be useful, but WITHOUT
-- ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
-- FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
-- for more details.
-- You should have received a copy of the GNU General Public License
-- along with VESTs; if not, write to the Free Software Foundation,
-- Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
-- ---------------------------------------------------------------------
--
-- $Id: tc2169.vhd,v 1.2 2001-10-26 16:29:46 paw Exp $
-- $Revision: 1.2 $
--
-- ---------------------------------------------------------------------
ENTITY c07s02b04x00p22n01i02169ent IS
END c07s02b04x00p22n01i02169ent;
ARCHITECTURE c07s02b04x00p22n01i02169arch OF c07s02b04x00p22n01i02169ent IS
TYPE severity_level_v is array (integer range <>) of severity_level;
SUBTYPE severity_level_8 is severity_level_v (1 to 8);
SUBTYPE severity_level_4 is severity_level_v (1 to 4);
BEGIN
TESTING: PROCESS
variable result : severity_level_4;
variable l_operand : severity_level_4 := ( NOTE , FAILURE , NOTE , FAILURE );
variable r_operand : severity_level_4 := ( FAILURE , FAILURE , NOTE , NOTE );
alias l_alias : severity_level_v (1 to 2) is l_operand (2 to 3);
alias r_alias : severity_level_v (1 to 2) is r_operand (3 to 4);
BEGIN
result := l_alias & r_alias;
wait for 5 ns;
assert NOT(( result = ( FAILURE , NOTE , NOTE , NOTE )) and ( result(1) = FAILURE ))
report "***PASSED TEST: c07s02b04x00p22n01i02169"
severity NOTE;
assert (( result = ( FAILURE , NOTE , NOTE , NOTE )) and ( result(1) = FAILURE ))
report "***FAILED TEST: c07s02b04x00p22n01i02169 - Concatenation of two SEVERITY_LEVEL aliases failed."
severity ERROR;
wait;
END PROCESS TESTING;
END c07s02b04x00p22n01i02169arch;
|
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`protect key_keyowner = "Aldec", key_keyname= "ALDEC08_001", key_method = "rsa"
`protect encoding = (enctype = "BASE64", line_length = 76, bytes = 256)
`protect key_block
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`protect data_method = "AES128-CBC"
`protect encoding = (enctype = "BASE64", line_length = 76, bytes = 8000)
`protect data_block
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|
ARCHITECTURE behavior OF tb_I2CBusMaster IS
-- DEFINE FREQUENCY HERE!
CONSTANT InputFrequency : integer := 100 * 1000 * 1000; -- 100 MHz
-- DEFINE WIDTH OF ReadCount_i HERE!
CONSTANT ReadCountWidth_c : integer := 4; -- 4 Bit ReadCount_i Vector
-- SELECT TESTCASE HERE!
-- | TestCase | Description | T_sim |
-- |---------------------------------------------------------------------|
-- | Case 1 | StartProcess but no (Adress)Byte in Buffer | 0.5 us |
-- | Case 2 | Writing AdressByte + BusColl + ErrAck | 50 us |
-- | Case 3 | Writing AdressByte + Nack => ErrDevNotPresent | 120 us |
-- | Case 4 | Writing AdressByte + 1 Byte + Ack | 250 us |
-- | Case 5 | Writing AdressByte + 1 Byte + Nack | 250 us |
-- | Case 6 | Reading + BytesToRead=0 | 10 us |
-- | Case 7 | Writing AdressByte + Reading 2 Bytes | 330 us |
-- | Case 8 | Writing AdressByte + Reading + BufferFull | 250 us |
-- |---------------------------------------------------------------------|
CONSTANT TestCase : Integer := 8;
--------------------------------------------------------------------------------
-- Configuration done - don't edit the following
--------------------------------------------------------------------------------
CONSTANT HalfClkPer : time := (1 sec)/(2*InputFrequency); -- 100 MHz => 5 ns
CONSTANT Divider : integer := (InputFrequency / (200 * 1000));
-- Component Declaration
COMPONENT i2cbusmaster IS
Generic ( ReadCountWidth_g : INTEGER := ReadCountWidth_c; -- 4 Bit ReadCount_i Vector
FIFOAddressWidth_g : INTEGER := 4; -- 2^4 Memory Cells
Divider200_g : INTEGER := (100 * 1000 * 1000 / (200 * 1000))-1;
Divider800_g : INTEGER := (100 * 1000 * 1000 / (800 * 1000))-1);
Port ( Reset_i : in STD_LOGIC;
Clk_i : in STD_LOGIC;
F100_400_n_i : in STD_LOGIC;
StartProcess_i : in STD_LOGIC;
ReceiveSend_n_i : in STD_LOGIC;
Busy_o : out STD_LOGIC;
ReadCount_i : in STD_LOGIC_VECTOR (ReadCountWidth_g-1 downto 0);
FIFOReadNext_i : in STD_LOGIC;
FIFOWrite_i : in STD_LOGIC;
FIFOEmpty_o : out STD_LOGIC;
FIFOFull_o : out STD_LOGIC;
Data_i : in STD_LOGIC_VECTOR(7 downto 0);
Data_o : out STD_LOGIC_VECTOR(7 downto 0);
ErrAck_i : in STD_LOGIC;
ErrBusColl_o : out STD_LOGIC;
ErrFIFOFull_o : out STD_LOGIC;
ErrGotNAck_o : out STD_LOGIC;
ErrCoreBusy_o : out STD_LOGIC;
ErrFIFOEmpty_o : out STD_LOGIC;
ErrCoreStopped_o : out STD_LOGIC;
ErrDevNotPresent_o : out STD_LOGIC;
ErrReadCountZero_o : out STD_LOGIC;
SDA_i : in STD_LOGIC;
SDA_o : out STD_LOGIC;
SCL_o : out STD_LOGIC);
END COMPONENT;
-- Signal Declaration
-- General Signals
SIGNAL Reset_i : STD_LOGIC;
SIGNAL Clk_i : STD_LOGIC;
SIGNAL F100_400_n_i : STD_LOGIC;
-- TransferController Signals
SIGNAL StartProcess_i : STD_LOGIC;
SIGNAL ReceiveSend_n_i : STD_LOGIC;
SIGNAL Busy_o : STD_LOGIC;
SIGNAL ReadCount_i : STD_LOGIC_VECTOR (ReadCountWidth_c-1 downto 0);
-- FIFO Signals
SIGNAL FIFOReadNext_i : STD_LOGIC;
SIGNAL FIFOWrite_i : STD_LOGIC;
SIGNAL FIFOEmpty_o : STD_LOGIC;
SIGNAL FIFOFull_o : STD_LOGIC;
-- Error-Handling Signals
SIGNAL ErrAck_i : STD_LOGIC;
SIGNAL ErrBusColl_o : STD_LOGIC;
SIGNAL ErrFIFOFull_o : STD_LOGIC;
SIGNAL ErrGotNAck_o : STD_LOGIC;
SIGNAL ErrCoreBusy_o : STD_LOGIC;
SIGNAL ErrFIFOEmpty_o : STD_LOGIC;
SIGNAL ErrCoreStopped_o : STD_LOGIC;
SIGNAL ErrDevNotPresent_o : STD_LOGIC;
SIGNAL ErrReadCountZero_o : STD_LOGIC;
-- Data Signals
SIGNAL Data_i : std_logic_vector (7 downto 0);
SIGNAL Data_o : std_logic_vector (7 downto 0);
-- I2C Bus Signals
SIGNAL SDA_o : std_logic;
SIGNAL SDA_i : std_logic;
SIGNAL SCL_o : std_logic;
-- Variables
SIGNAL SDA_Feedback : std_logic;
SIGNAL SDA_s : std_logic;
-- Procedure declaration
-- Wating Procedure to get next rising edge of clk_i
PROCEDURE wait4risingEdges(CONSTANT edges : IN INTEGER) IS
BEGIN
FOR edge IN 1 TO edges LOOP
wait until rising_edge(clk_i);
END LOOP;
END PROCEDURE;
-- Wating Procedure to get next rising edge of i2c-core internal clock
PROCEDURE wait4risingI2CEdges(CONSTANT edges : IN INTEGER) IS
BEGIN
FOR edge IN 1 TO Divider*edges LOOP
wait until rising_edge(clk_i);
END LOOP;
END PROCEDURE;
--------------------------------------------------------------------------------
BEGIN
-- Component Instantiation
mybusmaster : i2cbusmaster
GENERIC MAP ( ReadCountWidth_g => ReadCountWidth_c, -- 4 Bit ReadCount_i Vector
FIFOAddressWidth_g => 2, -- 2^2 Memory Cells
Divider200_g => Divider-1,
Divider800_g => (Divider/4)-1)
PORT MAP ( Reset_i => Reset_i,
Clk_i => Clk_i,
F100_400_n_i => F100_400_n_i,
StartProcess_i => StartProcess_i,
ReceiveSend_n_i => ReceiveSend_n_i,
Busy_o => Busy_o,
ReadCount_i => ReadCount_i,
FIFOReadNext_i => FIFOReadNext_i,
FIFOWrite_i => FIFOWrite_i,
FIFOEmpty_o => FIFOEmpty_o,
FIFOFull_o => FIFOFull_o,
Data_i => Data_i,
Data_o => Data_o,
ErrAck_i => ErrAck_i,
ErrBusColl_o => ErrBusColl_o,
ErrFIFOFull_o => ErrFIFOFull_o,
ErrGotNAck_o => ErrGotNAck_o,
ErrCoreBusy_o => ErrCoreBusy_o,
ErrFIFOEmpty_o => ErrFIFOEmpty_o,
ErrCoreStopped_o => ErrCoreStopped_o,
ErrDevNotPresent_o => ErrDevNotPresent_o,
ErrReadCountZero_o => ErrReadCountZero_o,
SDA_i => SDA_i,
SDA_o => SDA_o,
SCL_o => SCL_o);
-- END OF COMPONENTS
-- Process to generate Oszillation Signal (e.g. 100 MHz)
clock: PROCESS
BEGIN
Clk_i <= '0';
wait for HalfClkPer;
Clk_i <= '1';
wait for HalfClkPer;
END PROCESS clock;
-- Process to generate ControlCommands for DeviceUnderTest
CTRL : PROCESS
BEGIN
-- Default Signals
StartProcess_i <= '0';
ReceiveSend_n_i <= '0'; -- Sending Mode
ErrAck_i <= '0';
ReadCount_i <= "0000";
FIFOReadNext_i <= '0';
FIFOWrite_i <= '0';
data_i <= "00000000";
F100_400_n_i <= '1'; -- 100 kHz SCL-Frequency
SDA_s <= '1';
SDA_Feedback <= '1'; -- Enables feedback of SDA signal from SDA_o
-- to SDA_i to avoid BusCollision-Error
-- Running selected Testcase --
-- ========================= --
-- Reset
Reset_i <= '1';
wait4risingEdges(2);
Reset_i <= '0';
case TestCase is
--Case 1: StartProcess but no (Adress)Byte in Buffer | 0.5 us |
when 1 =>
-- Start Process
StartProcess_i <= '1';
wait4risingEdges(1);
StartProcess_i <= '0';
assert Busy_o = '1'
report "Error: Busy-Output is not set proper to '1'!"
severity warning;
-- Check ErrFIFOEmpty
wait4risingEdges(1);
assert ErrFIFOEmpty_o = '1'
report "ErrFIFOEmpty was not set in time!"
severity warning;
wait4risingEdges(10);
-- Acknowledge Error Signal
ErrAck_i <= '1';
wait4risingEdges(1);
ErrAck_i <= '0';
wait4risingEdges(1);
-- Check if Busy- and Error-Signals are proper reset
assert Busy_o = '0'
report "Error: Busy-Output is not set proper to '0'!"
severity warning;
assert ErrFIFOEmpty_o = '0'
report "Error: Busy-Output is not set proper!"
severity warning;
--------------------------------------------------------------------
--Case 2: Writing AdressByte + BusColl + ErrAck | 50 us |
when 2 =>
-- Filling FIFO with 1 Byte
Data_i <= "10010110";
FIFOWrite_i <= '1';
wait4risingEdges(1);
FIFOWrite_i <= '0';
-- Start Process
StartProcess_i <= '1';
wait4risingEdges(1);
StartProcess_i <= '0';
wait until SDA_o'event;
wait4risingI2CEdges(5);
SDA_Feedback <= '0';
wait4risingI2CEdges(1);
wait4risingEdges(1);
assert ErrBusColl_o = '1'
report "ErrBusColl_o was not set proper to '1'!"
severity warning;
wait4risingI2CEdges(1);
ErrAck_i <= '1';
wait4risingEdges(1);
ErrAck_i <= '0';
wait4risingEdges(1);
assert ErrBusColl_o = '0'
report "ErrBusColl_o was not set proper to '0'!"
severity warning;
--------------------------------------------------------------------
--Case 3: Writing AdressByte + Nack => ErrDevNotPresent | 150 us |
when 3 =>
-- Filling FIFO with 1 Byte
Data_i <= "10010110";
FIFOWrite_i <= '1';
wait4risingEdges(1);
FIFOWrite_i <= '0';
-- Start Process
StartProcess_i <= '1';
wait4risingEdges(1);
StartProcess_i <= '0';
wait until SCL_o'event;
-- wait until all 8 bits are transfered
wait4risingI2CEdges(16);
-- Check if FIFO is empty now
wait4risingEdges(1);
assert FIFOEmpty_o = '1'
report "FIFOEmpty_o was not set proper to '1'!"
severity warning;
SDA_Feedback <= '0'; -- disabling feedback of SDA
SDA_s <= '1'; -- Writing NACK to SDA_i
wait4risingI2CEdges(2);
-- Acknowledge Error-Signal
wait4risingI2CEdges(2);
ErrAck_i <= '1';
wait4risingEdges(1);
ErrAck_i <= '0';
-- Check if Busy- and Error-Signals are proper reset
wait4risingEdges(1);
assert Busy_o = '0'
report "Error: Busy-Output is not set proper to '0'!"
severity warning;
assert ErrFIFOEmpty_o = '0'
report "Error: Busy-Output is not set proper!"
severity warning;
--------------------------------------------------------------------
--Case 4: Writing AdressByte + 1 Byte + Ack | 250 us |
when 4 =>
-- Filling FIFO with two Bytes (Adress + 1 Data)
Data_i <= "10010110";
FIFOWrite_i <= '1';
wait4risingEdges(1);
Data_i <= "10101010";
wait4risingEdges(1);
FIFOWrite_i <= '0';
-- Start Process
StartProcess_i <= '1';
wait4risingEdges(1);
StartProcess_i <= '0';
-- FIRST BYTE
wait until SCL_o'event;
-- wait until all 8 bits of first byte are transfered
wait4risingI2CEdges(16);
SDA_Feedback <= '0'; -- disabling feedback of SDA
SDA_s <= '0'; -- Writing ACK to SDA_i
wait4risingI2CEdges(2);
SDA_Feedback <= '1'; -- enabling feedback of SDA
-- SECOND BYTE
-- wait until all 8 bits of first byte are transfered
wait4risingI2CEdges(16);
SDA_Feedback <= '0'; -- disabling feedback of SDA
SDA_s <= '0'; -- Writing ACK to SDA_i
wait4risingI2CEdges(2);
SDA_Feedback <= '1'; -- enabling feedback of SDA
wait4risingI2CEdges(2);
-- Check if FIFO is empty now
assert FIFOEmpty_o = '1'
report "FIFOEmpty_o was not set proper to '1'!"
severity warning;
-- Check if operation finished without error
assert ErrBusColl_o='0' AND ErrFIFOFull_o='0' AND ErrGotNAck_o='0'
AND ErrCoreBusy_o='0' AND ErrFIFOEmpty_o='0' AND ErrCoreStopped_o='0'
AND ErrDevNotPresent_o='0' AND ErrReadCountZero_o='0'
report "There was an unexpected Error-Signal set during the operation!"
severity warning;
-- Check if Busy- and Error-Signals are proper reset
assert Busy_o = '0'
report "Error: Busy-Output is not set proper to '0'!"
severity warning;
--------------------------------------------------------------------
--Case 5: Writing AdressByte + 1 Byte + Nack | 250 us |
when 5 =>
-- Filling FIFO with two Bytes (Adress + 1 Data)
Data_i <= "10010110";
FIFOWrite_i <= '1';
wait4risingEdges(1);
Data_i <= "10101010";
wait4risingEdges(1);
FIFOWrite_i <= '0';
-- Start Process
StartProcess_i <= '1';
wait4risingEdges(1);
StartProcess_i <= '0';
-- FIRST BYTE
wait until SCL_o'event;
-- wait until all 8 bits of first byte are transfered
wait4risingI2CEdges(16);
SDA_Feedback <= '0'; -- disabling feedback of SDA
SDA_s <= '0'; -- Writing ACK to SDA_i
wait4risingI2CEdges(2);
SDA_Feedback <= '1'; -- enabling feedback of SDA
-- SECOND BYTE
-- wait until all 8 bits of first byte are transfered
wait4risingI2CEdges(16);
SDA_Feedback <= '0'; -- disabling feedback of SDA
SDA_s <= '1'; -- Writing NACK to SDA_i
wait4risingI2CEdges(2);
SDA_Feedback <= '1'; -- enabling feedback of SDA
-- Check if FIFO is empty now
assert FIFOEmpty_o = '1'
report "FIFOEmpty_o was not set proper to '1'!"
severity warning;
-- Check if operation finished with right error signals
assert ErrBusColl_o='0' AND ErrFIFOFull_o='0' AND ErrGotNAck_o='1'
AND ErrCoreBusy_o='0' AND ErrFIFOEmpty_o='0' AND ErrCoreStopped_o='0'
AND ErrDevNotPresent_o='0' AND ErrReadCountZero_o='0'
report "Unexpected Error-Signal were set during the operation!"
severity warning;
-- Acknowleding the Error-Signal
ErrAck_i <= '1';
wait4risingEdges(1);
ErrAck_i <= '0';
wait4risingEdges(1);
-- Check if Busy- and Error-Signals are proper reset
assert ErrBusColl_o='0' AND ErrFIFOFull_o='0' AND ErrGotNAck_o='0'
AND ErrCoreBusy_o='0' AND ErrFIFOEmpty_o='0' AND ErrCoreStopped_o='0'
AND ErrDevNotPresent_o='0' AND ErrReadCountZero_o='0'
report "Not all Error-Signals are reset!"
severity warning;
wait4risingI2CEdges(2);
assert Busy_o = '0'
report "Busy-Output is not set proper to '0'!"
severity warning;
--------------------------------------------------------------------
--Case 6: Reading + BytesToRead=0 | 10 us |
when 6 =>
ReceiveSend_n_i <= '1';
-- Filling FIFO with 1 Byte
Data_i <= "10010110";
FIFOWrite_i <= '1';
wait4risingEdges(1);
FIFOWrite_i <= '0';
wait4risingEdges(1);
--Check if FIFO stores data
assert FIFOEmpty_o = '0'
report "Error: FIFO is empty!"
severity warning;
-- Start Process
StartProcess_i <= '1';
wait4risingEdges(1);
StartProcess_i <= '0';
wait4risingEdges(1);
--Check if Errorsignal was set proper
assert ErrReadCountZero_o = '1'
report "ErrReadCountZero was not set to '1'!"
severity warning;
wait4risingI2CEdges(1);
-- Acknowledge Error Signal
ErrAck_i <= '1';
wait4risingEdges(1);
ErrAck_i <= '0';
-- Check if Busy- and Error-Signals are proper reset
wait4risingEdges(1);
assert Busy_o = '0'
report "Error: Busy-Output is not set proper to '0'!"
severity warning;
assert ErrFIFOEmpty_o = '0'
report "Error: Busy-Output is not set proper!"
severity warning;
--------------------------------------------------------------------
--Case 7: Writing AdressByte + Reading 2 Bytes | 330 us |
when 7 =>
ReadCount_i <= "0010";
ReceiveSend_n_i <= '1';
-- Filling FIFO with 1 AdressByte
Data_i <= "10010110";
FIFOWrite_i <= '1';
wait4risingEdges(1);
FIFOWrite_i <= '0';
wait4risingEdges(1);
--Check if FIFO stores data
assert FIFOEmpty_o = '0'
report "Error: FIFO is empty!"
severity warning;
-- Start Process
StartProcess_i <= '1';
wait4risingEdges(1);
StartProcess_i <= '0';
-- Writing Adress-Byte
wait until SCL_o'event;
-- wait until all 8 bits of first byte are transfered
wait4risingI2CEdges(16);
SDA_Feedback <= '0'; -- disabling feedback of SDA
SDA_s <= '0'; -- Writing ACK to SDA_i
wait4risingI2CEdges(2);
--Reading first Databyte from SDA_i ("10001101")
SDA_s <= '1';
wait4risingI2CEdges(2);
SDA_s <= '0';
wait4risingI2CEdges(6);
SDA_s <= '1';
wait4risingI2CEdges(4);
SDA_s <= '0';
wait4risingI2CEdges(2);
SDA_s <= '1';
wait4risingI2CEdges(2);
--Check if Core writes ACK to SDA_o
wait4risingEdges(2);
assert SDA_o = '0'
report "Error: Core did not set ACK!"
severity warning;
-- Reading second Databyte from SDA_i ("11111111")
wait4risingI2CEdges(18);
--Check if Core writes NACK to SDA_o
assert SDA_o = '1'
report "Error: Core did not set NACK!"
severity warning;
wait4risingI2CEdges(4);
--Check if process finished in time
assert Busy_o = '0'
report "Error: Busy-Output is not set proper to '0'!"
severity warning;
--------------------------------------------------------------------
--Case 8: Writing AdressByte + Reading + BufferFull | 250 us |
when 8 =>
ReadCount_i <= "0100";
ReceiveSend_n_i <= '1';
-- Filling FIFO with 4 Bytes = FULL
Data_i <= "10010110";
FIFOWrite_i <= '1';
wait4risingEdges(4);
FIFOWrite_i <= '0';
--Check if FIFO stores data
assert FIFOEmpty_o = '0'
report "Error: FIFO is empty!"
severity warning;
-- Start Process
StartProcess_i <= '1';
wait4risingI2CEdges(1);
StartProcess_i <= '0';
-- Writing Adress-Byte
wait until SCL_o'event;
-- wait until all 8 bits of first byte are transfered
wait4risingI2CEdges(16);
SDA_Feedback <= '0'; -- disabling feedback of SDA
SDA_s <= '0'; -- Writing ACK to SDA_i
wait4risingI2CEdges(2);
--Reading first Databyte from SDA_i ("10001101")
SDA_s <= '1';
wait4risingI2CEdges(2);
SDA_s <= '0';
wait4risingI2CEdges(6);
SDA_s <= '1';
wait4risingI2CEdges(4);
SDA_s <= '0';
wait4risingI2CEdges(2);
SDA_s <= '1';
wait4risingI2CEdges(2);
--Check if FIFO is full after receiving Byte
wait4risingEdges(1);
assert FIFOFull_o = '1'
report "Error: FIFO is not full!"
severity warning;
wait4risingI2CEdges(1);
--Check if ErrFIFOFull_o is full after receiving Byte
assert ErrFIFOFull_o = '1'
report "Error ErrFIFOFull_o was not set (in time)!"
severity warning;
wait4risingI2CEdges(1);
-- Acknowledge Error Signal
ErrAck_i <= '1';
wait4risingEdges(1);
ErrAck_i <= '0';
wait4risingI2CEdges(2);
-- Check if Busy- and Error-Signals are proper reset
assert Busy_o = '0'
report "Error: Busy-Output is not set proper to '0'!"
severity warning;
assert ErrFIFOEmpty_o = '0'
report "Error: Busy-Output is not set proper!"
severity warning;
when others =>
END CASE;
wait;
END PROCESS;
-- Feedback of SDA_o to SDA_i - else set SDA_i by TestCase
SDA_i <= SDA_o when (SDA_Feedback = '1') else SDA_s;
END;
|
--------------------------------------------------------------------------------
-- Copyright (c) 1995-2010 Xilinx, Inc. All rights reserved.
--------------------------------------------------------------------------------
-- ____ ____
-- / /\/ /
-- /___/ \ / Vendor: Xilinx
-- \ \ \/ Version : 12.3
-- \ \ Application : xaw2vhdl
-- / / Filename : clk_blk.vhd
-- /___/ /\ Timestamp : 04/07/2011 10:39:11
-- \ \ / \
-- \___\/\___\
--
--Command: xaw2vhdl-st X:\\DSD\clk_blk\ipcore_dir\.\clk_blk.xaw X:\\DSD\clk_blk\ipcore_dir\.\clk_blk
--Design Name: clk_blk
--Device: xc3s500e-4fg320
--
-- Module clk_blk
-- Generated by Xilinx Architecture Wizard
-- Written for synthesis tool: XST
library ieee;
use ieee.std_logic_1164.ALL;
use ieee.numeric_std.ALL;
library UNISIM;
use UNISIM.Vcomponents.ALL;
entity clk_blk is
port ( CLKIN_IN : in std_logic;
RST_IN : in std_logic;
CLK0_OUT : out std_logic;
CLK180_OUT : out std_logic;
LOCKED_OUT : out std_logic);
end clk_blk;
architecture BEHAVIORAL of clk_blk is
signal CLKFB_IN : std_logic;
signal CLK0_BUF : std_logic;
signal CLK180_BUF : std_logic;
signal GND_BIT : std_logic;
begin
GND_BIT <= '0';
CLK0_OUT <= CLKFB_IN;
CLK0_BUFG_INST : BUFG
port map (I=>CLK0_BUF,
O=>CLKFB_IN);
CLK180_BUFG_INST : BUFG
port map (I=>CLK180_BUF,
O=>CLK180_OUT);
DCM_SP_INST : DCM_SP
generic map( CLK_FEEDBACK => "1X",
CLKDV_DIVIDE => 2.0,
CLKFX_DIVIDE => 1,
CLKFX_MULTIPLY => 4,
CLKIN_DIVIDE_BY_2 => FALSE,
CLKIN_PERIOD => 20.000,
CLKOUT_PHASE_SHIFT => "NONE",
DESKEW_ADJUST => "SYSTEM_SYNCHRONOUS",
DFS_FREQUENCY_MODE => "LOW",
DLL_FREQUENCY_MODE => "LOW",
DUTY_CYCLE_CORRECTION => TRUE,
FACTORY_JF => x"C080",
PHASE_SHIFT => 0,
STARTUP_WAIT => FALSE)
port map (CLKFB=>CLKFB_IN,
CLKIN=>CLKIN_IN,
DSSEN=>GND_BIT,
PSCLK=>GND_BIT,
PSEN=>GND_BIT,
PSINCDEC=>GND_BIT,
RST=>RST_IN,
CLKDV=>open,
CLKFX=>open,
CLKFX180=>open,
CLK0=>CLK0_BUF,
CLK2X=>open,
CLK2X180=>open,
CLK90=>open,
CLK180=>CLK180_BUF,
CLK270=>open,
LOCKED=>LOCKED_OUT,
PSDONE=>open,
STATUS=>open);
end BEHAVIORAL;
|
entity error3 is
end entity;
architecture test of error3 is
-- Examples from LRM 93 section 7.2.5
type R1 is 0 to 7; -- Error
type R2 is 7 downto 0; -- Error
type T1 is array (R1 range <>) of Bit;
type T2 is array (R2 range <>) of Bit;
subtype S1 is T1(R1);
subtype S2 is T2(R2);
constant K1: S1 := (others => '0');
constant K2: T1 := K1(1 to 3) & K1(3 to 4); -- K2'Left = 0 and K2'Right = 4
constant K3: T1 := K1(5 to 7) & K1(1 to 2); -- K3'Left = 0 and K3'Right = 4
constant K4: T1 := K1(2 to 1) & K1(1 to 2); -- K4'Left = 0 and K4'Right = 1
constant K5: S2 := (others => '0');
constant K6: T2 := K5(3 downto 1) & K5(4 downto 3); -- K6'Left = 7 and K6'Right = 3
constant K7: T2 := K5(7 downto 5) & K5(2 downto 1); -- K7'Left = 7 and K7'Right = 3
constant K8: T2 := K5(1 downto 2) & K5(2 downto 1); -- K8'Left = 7 and K8'Right = 6
begin
end architecture;
|
`protect begin_protected
`protect version = 1
`protect encrypt_agent = "XILINX"
`protect encrypt_agent_info = "Xilinx Encryption Tool 2014"
`protect key_keyowner = "Cadence Design Systems.", key_keyname= "cds_rsa_key", key_method = "rsa"
`protect encoding = (enctype = "BASE64", line_length = 76, bytes = 64)
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`protect encoding = (enctype = "BASE64", line_length = 76, bytes = 256)
`protect key_block
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`protect encoding = (enctype = "BASE64", line_length = 76, bytes = 256)
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|
`protect begin_protected
`protect version = 1
`protect encrypt_agent = "XILINX"
`protect encrypt_agent_info = "Xilinx Encryption Tool 2014"
`protect key_keyowner = "Cadence Design Systems.", key_keyname= "cds_rsa_key", key_method = "rsa"
`protect encoding = (enctype = "BASE64", line_length = 76, bytes = 64)
`protect key_block
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`protect key_keyowner = "Mentor Graphics Corporation", key_keyname= "MGC-VERIF-SIM-RSA-1", key_method = "rsa"
`protect encoding = (enctype = "BASE64", line_length = 76, bytes = 128)
`protect key_block
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`protect encoding = (enctype = "BASE64", line_length = 76, bytes = 128)
`protect key_block
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`protect encoding = (enctype = "BASE64", line_length = 76, bytes = 256)
`protect key_block
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`protect encoding = (enctype = "BASE64", line_length = 76, bytes = 256)
`protect key_block
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`protect key_keyowner = "Xilinx", key_keyname= "xilinx_2016_05", key_method = "rsa"
`protect encoding = (enctype = "BASE64", line_length = 76, bytes = 256)
`protect key_block
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`protect encoding = (enctype = "BASE64", line_length = 76, bytes = 4032)
`protect data_block
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`protect end_protected
|
`protect begin_protected
`protect version = 1
`protect encrypt_agent = "XILINX"
`protect encrypt_agent_info = "Xilinx Encryption Tool 2014"
`protect key_keyowner = "Cadence Design Systems.", key_keyname= "cds_rsa_key", key_method = "rsa"
`protect encoding = (enctype = "BASE64", line_length = 76, bytes = 64)
`protect key_block
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`protect encoding = (enctype = "BASE64", line_length = 76, bytes = 128)
`protect key_block
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`protect encoding = (enctype = "BASE64", line_length = 76, bytes = 128)
`protect key_block
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`protect encoding = (enctype = "BASE64", line_length = 76, bytes = 256)
`protect key_block
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`protect key_block
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`protect encoding = (enctype = "BASE64", line_length = 76, bytes = 256)
`protect key_block
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`protect encoding = (enctype = "BASE64", line_length = 76, bytes = 4032)
`protect data_block
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|
`protect begin_protected
`protect version = 1
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`protect encrypt_agent_info = "Xilinx Encryption Tool 2014"
`protect key_keyowner = "Cadence Design Systems.", key_keyname= "cds_rsa_key", key_method = "rsa"
`protect encoding = (enctype = "BASE64", line_length = 76, bytes = 64)
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`protect key_block
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`protect encoding = (enctype = "BASE64", line_length = 76, bytes = 256)
`protect key_block
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`protect encoding = (enctype = "BASE64", line_length = 76, bytes = 256)
`protect key_block
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`protect end_protected
|
`protect begin_protected
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`protect encoding = (enctype = "BASE64", line_length = 76, bytes = 64)
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|
library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
entity frequency_counter is
generic
(
res : positive;
gate : positive
);
port
(
clk : in std_logic;
cnt_in : in std_logic;
cnt_out : out std_logic_vector(res-1 downto 0)
);
end entity;
architecture rtl of frequency_counter is
signal clk1_en : std_logic := '0';
signal clk1_en_s: std_logic := '0';
signal rst : std_logic := '0';
signal latch : std_logic := '0';
signal cnt1 : unsigned(res-1 downto 0);
signal cnt2 : unsigned(res-1 downto 0);
begin
sync : process
begin
wait until rising_edge(cnt_in);
clk1_en_s <= clk1_en;
end process;
output : process
begin
wait until rising_edge(clk);
if latch = '1' then
cnt_out <= std_logic_vector(cnt1);
end if;
end process;
counter1 : process(rst, cnt_in)
begin
if rst = '1' then
cnt1 <= (others => '0');
elsif rising_edge(cnt_in) then
if clk1_en_s = '1' then
cnt1 <= cnt1 + 1;
end if;
end if;
end process;
counter2 : process
begin
wait until rising_edge(clk);
if rst = '1' then
cnt2 <= (others => '0');
elsif clk1_en = '1' then
cnt2 <= cnt2 + 1;
end if;
end process;
process
begin
wait until rising_edge(clk);
if cnt2 = 0 then
clk1_en <= '1';
latch <= '0';
rst <= '0';
elsif cnt2 = gate then
clk1_en <= '0';
latch <= '1';
rst <= '0';
elsif cnt2 = gate+1 then
clk1_en <= '0';
latch <= '0';
rst <= '1';
end if;
end process;
end rtl;
|
--Copyright 1986-2015 Xilinx, Inc. All Rights Reserved.
----------------------------------------------------------------------------------
--Tool Version: Vivado v.2015.4.2 (win64) Build 1494164 Fri Feb 26 04:18:56 MST 2016
--Date : Thu Sep 01 16:06:03 2016
--Host : DESKTOP-I329812 running 64-bit major release (build 9200)
--Command : generate_target design_SWandHW_standalone_wrapper.bd
--Design : design_SWandHW_standalone_wrapper
--Purpose : IP block netlist
----------------------------------------------------------------------------------
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
library UNISIM;
use UNISIM.VCOMPONENTS.ALL;
entity design_SWandHW_standalone_wrapper is
port (
DDR_addr : inout STD_LOGIC_VECTOR ( 14 downto 0 );
DDR_ba : inout STD_LOGIC_VECTOR ( 2 downto 0 );
DDR_cas_n : inout STD_LOGIC;
DDR_ck_n : inout STD_LOGIC;
DDR_ck_p : inout STD_LOGIC;
DDR_cke : inout STD_LOGIC;
DDR_cs_n : inout STD_LOGIC;
DDR_dm : inout STD_LOGIC_VECTOR ( 3 downto 0 );
DDR_dq : inout STD_LOGIC_VECTOR ( 31 downto 0 );
DDR_dqs_n : inout STD_LOGIC_VECTOR ( 3 downto 0 );
DDR_dqs_p : inout STD_LOGIC_VECTOR ( 3 downto 0 );
DDR_odt : inout STD_LOGIC;
DDR_ras_n : inout STD_LOGIC;
DDR_reset_n : inout STD_LOGIC;
DDR_we_n : inout STD_LOGIC;
FIXED_IO_ddr_vrn : inout STD_LOGIC;
FIXED_IO_ddr_vrp : inout STD_LOGIC;
FIXED_IO_mio : inout STD_LOGIC_VECTOR ( 53 downto 0 );
FIXED_IO_ps_clk : inout STD_LOGIC;
FIXED_IO_ps_porb : inout STD_LOGIC;
FIXED_IO_ps_srstb : inout STD_LOGIC;
leds_4bits_tri_io : inout STD_LOGIC_VECTOR ( 3 downto 0 )
);
end design_SWandHW_standalone_wrapper;
architecture STRUCTURE of design_SWandHW_standalone_wrapper is
component design_SWandHW_standalone is
port (
DDR_cas_n : inout STD_LOGIC;
DDR_cke : inout STD_LOGIC;
DDR_ck_n : inout STD_LOGIC;
DDR_ck_p : inout STD_LOGIC;
DDR_cs_n : inout STD_LOGIC;
DDR_reset_n : inout STD_LOGIC;
DDR_odt : inout STD_LOGIC;
DDR_ras_n : inout STD_LOGIC;
DDR_we_n : inout STD_LOGIC;
DDR_ba : inout STD_LOGIC_VECTOR ( 2 downto 0 );
DDR_addr : inout STD_LOGIC_VECTOR ( 14 downto 0 );
DDR_dm : inout STD_LOGIC_VECTOR ( 3 downto 0 );
DDR_dq : inout STD_LOGIC_VECTOR ( 31 downto 0 );
DDR_dqs_n : inout STD_LOGIC_VECTOR ( 3 downto 0 );
DDR_dqs_p : inout STD_LOGIC_VECTOR ( 3 downto 0 );
FIXED_IO_mio : inout STD_LOGIC_VECTOR ( 53 downto 0 );
FIXED_IO_ddr_vrn : inout STD_LOGIC;
FIXED_IO_ddr_vrp : inout STD_LOGIC;
FIXED_IO_ps_srstb : inout STD_LOGIC;
FIXED_IO_ps_clk : inout STD_LOGIC;
FIXED_IO_ps_porb : inout STD_LOGIC;
leds_4bits_tri_i : in STD_LOGIC_VECTOR ( 3 downto 0 );
leds_4bits_tri_o : out STD_LOGIC_VECTOR ( 3 downto 0 );
leds_4bits_tri_t : out STD_LOGIC_VECTOR ( 3 downto 0 )
);
end component design_SWandHW_standalone;
component IOBUF is
port (
I : in STD_LOGIC;
O : out STD_LOGIC;
T : in STD_LOGIC;
IO : inout STD_LOGIC
);
end component IOBUF;
signal leds_4bits_tri_i_0 : STD_LOGIC_VECTOR ( 0 to 0 );
signal leds_4bits_tri_i_1 : STD_LOGIC_VECTOR ( 1 to 1 );
signal leds_4bits_tri_i_2 : STD_LOGIC_VECTOR ( 2 to 2 );
signal leds_4bits_tri_i_3 : STD_LOGIC_VECTOR ( 3 to 3 );
signal leds_4bits_tri_io_0 : STD_LOGIC_VECTOR ( 0 to 0 );
signal leds_4bits_tri_io_1 : STD_LOGIC_VECTOR ( 1 to 1 );
signal leds_4bits_tri_io_2 : STD_LOGIC_VECTOR ( 2 to 2 );
signal leds_4bits_tri_io_3 : STD_LOGIC_VECTOR ( 3 to 3 );
signal leds_4bits_tri_o_0 : STD_LOGIC_VECTOR ( 0 to 0 );
signal leds_4bits_tri_o_1 : STD_LOGIC_VECTOR ( 1 to 1 );
signal leds_4bits_tri_o_2 : STD_LOGIC_VECTOR ( 2 to 2 );
signal leds_4bits_tri_o_3 : STD_LOGIC_VECTOR ( 3 to 3 );
signal leds_4bits_tri_t_0 : STD_LOGIC_VECTOR ( 0 to 0 );
signal leds_4bits_tri_t_1 : STD_LOGIC_VECTOR ( 1 to 1 );
signal leds_4bits_tri_t_2 : STD_LOGIC_VECTOR ( 2 to 2 );
signal leds_4bits_tri_t_3 : STD_LOGIC_VECTOR ( 3 to 3 );
begin
design_SWandHW_standalone_i: component design_SWandHW_standalone
port map (
DDR_addr(14 downto 0) => DDR_addr(14 downto 0),
DDR_ba(2 downto 0) => DDR_ba(2 downto 0),
DDR_cas_n => DDR_cas_n,
DDR_ck_n => DDR_ck_n,
DDR_ck_p => DDR_ck_p,
DDR_cke => DDR_cke,
DDR_cs_n => DDR_cs_n,
DDR_dm(3 downto 0) => DDR_dm(3 downto 0),
DDR_dq(31 downto 0) => DDR_dq(31 downto 0),
DDR_dqs_n(3 downto 0) => DDR_dqs_n(3 downto 0),
DDR_dqs_p(3 downto 0) => DDR_dqs_p(3 downto 0),
DDR_odt => DDR_odt,
DDR_ras_n => DDR_ras_n,
DDR_reset_n => DDR_reset_n,
DDR_we_n => DDR_we_n,
FIXED_IO_ddr_vrn => FIXED_IO_ddr_vrn,
FIXED_IO_ddr_vrp => FIXED_IO_ddr_vrp,
FIXED_IO_mio(53 downto 0) => FIXED_IO_mio(53 downto 0),
FIXED_IO_ps_clk => FIXED_IO_ps_clk,
FIXED_IO_ps_porb => FIXED_IO_ps_porb,
FIXED_IO_ps_srstb => FIXED_IO_ps_srstb,
leds_4bits_tri_i(3) => leds_4bits_tri_i_3(3),
leds_4bits_tri_i(2) => leds_4bits_tri_i_2(2),
leds_4bits_tri_i(1) => leds_4bits_tri_i_1(1),
leds_4bits_tri_i(0) => leds_4bits_tri_i_0(0),
leds_4bits_tri_o(3) => leds_4bits_tri_o_3(3),
leds_4bits_tri_o(2) => leds_4bits_tri_o_2(2),
leds_4bits_tri_o(1) => leds_4bits_tri_o_1(1),
leds_4bits_tri_o(0) => leds_4bits_tri_o_0(0),
leds_4bits_tri_t(3) => leds_4bits_tri_t_3(3),
leds_4bits_tri_t(2) => leds_4bits_tri_t_2(2),
leds_4bits_tri_t(1) => leds_4bits_tri_t_1(1),
leds_4bits_tri_t(0) => leds_4bits_tri_t_0(0)
);
leds_4bits_tri_iobuf_0: component IOBUF
port map (
I => leds_4bits_tri_o_0(0),
IO => leds_4bits_tri_io(0),
O => leds_4bits_tri_i_0(0),
T => leds_4bits_tri_t_0(0)
);
leds_4bits_tri_iobuf_1: component IOBUF
port map (
I => leds_4bits_tri_o_1(1),
IO => leds_4bits_tri_io(1),
O => leds_4bits_tri_i_1(1),
T => leds_4bits_tri_t_1(1)
);
leds_4bits_tri_iobuf_2: component IOBUF
port map (
I => leds_4bits_tri_o_2(2),
IO => leds_4bits_tri_io(2),
O => leds_4bits_tri_i_2(2),
T => leds_4bits_tri_t_2(2)
);
leds_4bits_tri_iobuf_3: component IOBUF
port map (
I => leds_4bits_tri_o_3(3),
IO => leds_4bits_tri_io(3),
O => leds_4bits_tri_i_3(3),
T => leds_4bits_tri_t_3(3)
);
end STRUCTURE;
|
-------------------------------------------------------------------------------
--! @file dpRamSplxNbe-a.vhd
--
--! @brief Simplex Dual Port Ram without byteenables
--
--! @details This is the Simplex DPRAM without byteenables for Xilinx platforms.
--! The DPRAM has one write and one read port only.
--! Timing as follows [clk-cycles]: write=0 / read=1
--
-------------------------------------------------------------------------------
--
-- (c) B&R, 2014
--
-- Redistribution and use in source and binary forms, with or without
-- modification, are permitted provided that the following conditions
-- are met:
--
-- 1. Redistributions of source code must retain the above copyright
-- notice, this list of conditions and the following disclaimer.
--
-- 2. Redistributions in binary form must reproduce the above copyright
-- notice, this list of conditions and the following disclaimer in the
-- documentation and/or other materials provided with the distribution.
--
-- 3. Neither the name of B&R nor the names of its
-- contributors may be used to endorse or promote products derived
-- from this software without prior written permission. For written
-- permission, please contact office@br-automation.com
--
-- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-- "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-- LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
-- FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
-- COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
-- INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
-- BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
-- LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
-- CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-- LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
-- ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
-- POSSIBILITY OF SUCH DAMAGE.
--
-------------------------------------------------------------------------------
library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
--! Common library
library libcommon;
--! Use common library global package
use libcommon.global.all;
architecture rtl of dpRamSplxNbe is
--! Address width (used to generate size depending on address width)
constant cAddrWidth : natural := iAddress_A'length;
--! RAM size
constant cRamSize : natural := 2**cAddrWidth;
--! Type for data port
subtype tDataPort is std_logic_vector(gWordWidth-1 downto 0);
--! RAM type with given size
type tRam is array (cRamSize-1 downto 0) of tDataPort;
--! Shared variable to model and synthesize a DPR
shared variable vDpram : tRam := (others => (others => cInactivated));
--! Port B readport
signal readdataB : tDataPort;
begin
-- assign readdata to ports
oReaddata_B <= readdataB;
--! This process describes port A of the DPRAM. The write process considers
--! iWriteEnable_A.
PORTA : process(iClk_A)
begin
if rising_edge(iClk_A) then
if iEnable_A = cActivated then
if iWriteEnable_A = cActivated then
-- write byte to DPRAM
vDpram(to_integer(unsigned(iAddress_A))) := iWritedata_A;
end if; --writeenable
end if; --enable
end if;
end process PORTA;
--! This process describes port B of the DPRAM. The read process is done
--! with every rising iClk_B edge.
PORTB : process(iClk_B)
begin
if rising_edge(iClk_B) then
if iEnable_B = cActivated then
-- read word from DPRAM
readdataB <= vDpram(to_integer(unsigned(iAddress_B)));
end if; --enable
end if;
end process PORTB;
end architecture rtl;
|
----------------------------------------------------------------------------------
-- Company:
-- Engineer:
--
-- Create Date: 01:54:20 09/12/2011
-- Design Name:
-- Module Name: winglcdsndbut - Behavioral
-- Project Name:
-- Target Devices:
-- Tool versions:
-- Description:
--
-- Dependencies:
--
-- Revision:
-- Revision 0.01 - File Created
-- Additional Comments:
--
----------------------------------------------------------------------------------
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
-- Uncomment the following library declaration if using
-- arithmetic functions with Signed or Unsigned values
--use IEEE.NUMERIC_STD.ALL;
-- Uncomment the following library declaration if instantiating
-- any Xilinx primitives in this code.
library UNISIM;
use UNISIM.VComponents.all;
entity winglcdsndbut is
Port (
W1A : inout STD_LOGIC_VECTOR (15 downto 0);
W1B : inout STD_LOGIC_VECTOR (15 downto 0);
buttons : out std_logic_vector(5 downto 0);
audio_left : in STD_LOGIC;
audio_right : in STD_LOGIC;
ud : in STD_LOGIC;
rl : in STD_LOGIC;
enab : in STD_LOGIC;
vsync : in STD_LOGIC;
hsync : in STD_LOGIC;
ck : in STD_LOGIC;
r : in std_logic_vector(5 downto 0);
g : in std_logic_vector(5 downto 0);
b : in std_logic_vector(5 downto 0)
);
end winglcdsndbut;
architecture Behavioral of winglcdsndbut is
signal CLK_OUT, clki, clki_n : STD_LOGIC;
begin
w1b(14) <= 'Z';
w1b(15) <= 'Z';
w1a(0) <= 'Z';
w1a(1) <= 'Z';
w1b(0) <= 'Z';
w1b(1) <= 'Z';
buttons(5) <= w1b(14);
buttons(4) <= w1b(15);
buttons(3) <= w1a(0);
buttons(2) <= w1a(1);
buttons(1) <= w1b(0);
buttons(0) <= w1b(1);
w1a(14) <= audio_right;
w1a(15) <= audio_left;
w1a(2) <= ud;
w1b(13) <= rl;
w1a(3) <= enab;
w1b(3) <= vsync;
w1a(13) <= hsync;
-- w1b(2) <= ck;
w1a(10) <= r(5);
w1b(6) <= r(4);
w1a(11) <= r(3);
w1b(5) <= r(2);
w1a(12) <= r(1);
w1b(4) <= r(0);
w1b(9) <= g(5);
w1a(7) <= g(4);
w1b(8) <= g(3);
w1a(8) <= g(2);
w1b(7) <= g(1);
w1a(9) <= g(0);
w1a(4) <= b(5);
w1b(12) <= b(4);
w1a(5) <= b(3);
w1b(11) <= b(2);
w1a(6) <= b(1);
w1b(10) <= b(0);
clkout_oddr : ODDR2
port map
(Q => w1b(2),
C0 => clki,
C1 => clki_n,
CE => '1',
D0 => '1',
D1 => '0',
R => '0',
S => '0');
-- Connect the output clocks to the design
-------------------------------------------
clki <= ck;
clki_n <= not clki;
end Behavioral;
|
----------------------------------------------------------------------------------
-- Company:
-- Engineer:
--
-- Create Date: 01:54:20 09/12/2011
-- Design Name:
-- Module Name: winglcdsndbut - Behavioral
-- Project Name:
-- Target Devices:
-- Tool versions:
-- Description:
--
-- Dependencies:
--
-- Revision:
-- Revision 0.01 - File Created
-- Additional Comments:
--
----------------------------------------------------------------------------------
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
-- Uncomment the following library declaration if using
-- arithmetic functions with Signed or Unsigned values
--use IEEE.NUMERIC_STD.ALL;
-- Uncomment the following library declaration if instantiating
-- any Xilinx primitives in this code.
library UNISIM;
use UNISIM.VComponents.all;
entity winglcdsndbut is
Port (
W1A : inout STD_LOGIC_VECTOR (15 downto 0);
W1B : inout STD_LOGIC_VECTOR (15 downto 0);
buttons : out std_logic_vector(5 downto 0);
audio_left : in STD_LOGIC;
audio_right : in STD_LOGIC;
ud : in STD_LOGIC;
rl : in STD_LOGIC;
enab : in STD_LOGIC;
vsync : in STD_LOGIC;
hsync : in STD_LOGIC;
ck : in STD_LOGIC;
r : in std_logic_vector(5 downto 0);
g : in std_logic_vector(5 downto 0);
b : in std_logic_vector(5 downto 0)
);
end winglcdsndbut;
architecture Behavioral of winglcdsndbut is
signal CLK_OUT, clki, clki_n : STD_LOGIC;
begin
w1b(14) <= 'Z';
w1b(15) <= 'Z';
w1a(0) <= 'Z';
w1a(1) <= 'Z';
w1b(0) <= 'Z';
w1b(1) <= 'Z';
buttons(5) <= w1b(14);
buttons(4) <= w1b(15);
buttons(3) <= w1a(0);
buttons(2) <= w1a(1);
buttons(1) <= w1b(0);
buttons(0) <= w1b(1);
w1a(14) <= audio_right;
w1a(15) <= audio_left;
w1a(2) <= ud;
w1b(13) <= rl;
w1a(3) <= enab;
w1b(3) <= vsync;
w1a(13) <= hsync;
-- w1b(2) <= ck;
w1a(10) <= r(5);
w1b(6) <= r(4);
w1a(11) <= r(3);
w1b(5) <= r(2);
w1a(12) <= r(1);
w1b(4) <= r(0);
w1b(9) <= g(5);
w1a(7) <= g(4);
w1b(8) <= g(3);
w1a(8) <= g(2);
w1b(7) <= g(1);
w1a(9) <= g(0);
w1a(4) <= b(5);
w1b(12) <= b(4);
w1a(5) <= b(3);
w1b(11) <= b(2);
w1a(6) <= b(1);
w1b(10) <= b(0);
clkout_oddr : ODDR2
port map
(Q => w1b(2),
C0 => clki,
C1 => clki_n,
CE => '1',
D0 => '1',
D1 => '0',
R => '0',
S => '0');
-- Connect the output clocks to the design
-------------------------------------------
clki <= ck;
clki_n <= not clki;
end Behavioral;
|
-- $Id: tbcore_rlink.vhd 1181 2019-07-08 17:00:50Z mueller $
-- SPDX-License-Identifier: GPL-3.0-or-later
-- Copyright 2010-2018 by Walter F.J. Mueller <W.F.J.Mueller@gsi.de>
--
------------------------------------------------------------------------------
-- Module Name: tbcore_rlink - sim
-- Description: Core for a rlink_cext based test bench
--
-- Dependencies: simlib/simclkcnt
-- rlink_cext_iface
--
-- To test: generic, any rlink_cext based target
--
-- Target Devices: generic
-- Tool versions: ghdl 0.26-0.34
-- Revision History:
-- Date Rev Version Comment
-- 2018-11-25 1074 3.3 wait 40 cycles after CONF_DONE
-- 2016-09-17 807 3.2.2 conf: .sinit -> .sdata; finite length SB_VAL pulse
-- 2016-09-02 805 3.2.1 conf: add .wait and CONF_DONE; drop CLK_STOP
-- 2016-02-07 729 3.2 use rlink_cext_iface (allow VHPI and DPI backend)
-- 2015-11-01 712 3.1.3 proc_stim: drive SB_CNTL from start to avoid 'U'
-- 2013-01-04 469 3.1.2 use 1ns wait for .sinit to allow simbus debugging
-- 2011-12-25 445 3.1.1 add SB_ init drivers to avoid SB_VAL='U' at start
-- 2011-12-23 444 3.1 redo clock handling, remove simclk, CLK now input
-- 2011-11-19 427 3.0.1 now numeric_std clean
-- 2010-12-29 351 3.0 rename rritb_core->tbcore_rlink; use rbv3 naming
-- 2010-06-05 301 1.1.2 rename .rpmon -> .rbmon
-- 2010-05-02 287 1.1.1 rename config command .sdata -> .sinit;
-- use sbcntl_sbf_(cp|rp)mon defs, use rritblib;
-- 2010-04-25 283 1.1 new clk handling in proc_stim, wait period-setup
-- 2010-04-24 282 1.0 Initial version (from vlib/s3board/tb/tb_s3board)
------------------------------------------------------------------------------
library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
use ieee.std_logic_textio.all;
use std.textio.all;
use work.slvtypes.all;
use work.simlib.all;
use work.simbus.all;
use work.rblib.all;
use work.rlinklib.all;
entity tbcore_rlink is -- core of rlink_cext based test bench
port (
CLK : in slbit; -- control interface clock
RX_DATA : out slv8; -- read data (data ext->tb)
RX_VAL : out slbit; -- read data valid (data ext->tb)
RX_HOLD : in slbit; -- read data hold (data ext->tb)
TX_DATA : in slv8; -- write data (data tb->ext)
TX_ENA : in slbit -- write data enable (data tb->ext)
);
end tbcore_rlink;
architecture sim of tbcore_rlink is
signal CLK_CYCLE : integer := 0;
signal CEXT_CYCLE : slv32 := (others=>'0');
signal CEXT_RXDATA : slv32 := (others=>'0');
signal CEXT_RXVAL : slbit := '0';
signal CEXT_RXHOLD : slbit := '1';
signal CONF_DONE : slbit := '0';
begin
CLKCNT : simclkcnt port map (CLK => CLK, CLK_CYCLE => CLK_CYCLE);
CEXT_IFACE : entity work.rlink_cext_iface
port map (
CLK => CLK,
CLK_CYCLE => CEXT_CYCLE,
RX_DATA => CEXT_RXDATA,
RX_VAL => CEXT_RXVAL,
RX_HOLD => CEXT_RXHOLD,
TX_DATA => TX_DATA,
TX_ENA => TX_ENA
);
CEXT_CYCLE <= slv(to_signed(CLK_CYCLE,32));
proc_conf: process
file fconf : text open read_mode is "rlink_cext_conf";
variable iline : line;
variable oline : line;
variable ok : boolean;
variable dname : string(1 to 6) := (others=>' ');
variable ien : slbit := '0';
variable ibit : integer := 0;
variable twait : Delay_length := 0 ns;
variable iaddr : slv8 := (others=>'0');
variable idata : slv16 := (others=>'0');
begin
CONF_DONE <= '0';
SB_SIMSTOP <= 'L';
SB_CNTL <= (others=>'L');
SB_VAL <= 'L';
SB_ADDR <= (others=>'L');
SB_DATA <= (others=>'L');
file_loop: while not endfile(fconf) loop
readline (fconf, iline);
readcomment(iline, ok);
next file_loop when ok;
readword(iline, dname, ok);
if ok then
case dname is
when ".scntl" => -- .scntl
read_ea(iline, ibit);
read_ea(iline, ien);
assert (ibit>=SB_CNTL'low and ibit<=SB_CNTL'high)
report "assert bit number in range of SB_CNTL"
severity failure;
wait for 1 ns;
if ien = '1' then
SB_CNTL(ibit) <= 'H';
else
SB_CNTL(ibit) <= 'L';
end if;
when ".rlmon" => -- .rlmon
read_ea(iline, ien);
wait for 1 ns;
if ien = '1' then
SB_CNTL(sbcntl_sbf_rlmon) <= 'H';
else
SB_CNTL(sbcntl_sbf_rlmon) <= 'L';
end if;
when ".rbmon" => -- .rbmon
read_ea(iline, ien);
wait for 1 ns;
if ien = '1' then
SB_CNTL(sbcntl_sbf_rbmon) <= 'H';
else
SB_CNTL(sbcntl_sbf_rbmon) <= 'L';
end if;
when ".sdata" => -- .sdata
readgen_ea(iline, iaddr, 16);
readgen_ea(iline, idata, 16);
wait for 1 ns;
SB_ADDR <= iaddr;
SB_DATA <= idata;
SB_VAL <= 'H';
wait for 1 ns;
SB_VAL <= 'L';
SB_ADDR <= (others=>'L');
SB_DATA <= (others=>'L');
when ".wait " => -- .wait
read_ea(iline, twait);
wait for twait;
when others => -- bad command
write(oline, string'("?? unknown command: "));
write(oline, dname);
writeline(output, oline);
report "aborting" severity failure;
end case;
else
report "failed to find command" severity failure;
end if;
testempty_ea(iline);
end loop; -- file_loop:
SB_VAL <= 'L';
SB_ADDR <= (others=>'L');
SB_DATA <= (others=>'L');
CONF_DONE <= '1';
wait; -- halt process here
end process proc_conf;
proc_stim: process
variable irxint : integer := 0;
variable irxslv : slv24 := (others=>'0');
variable ibit : integer := 0;
variable oline : line;
variable r_sb_cntl : slv16 := (others=>'Z');
variable iaddr : slv8 := (others=>'0');
variable idata : slv16 := (others=>'0');
begin
-- setup init values for all output ports
RX_DATA <= (others=>'0');
RX_VAL <= '0';
SB_VAL <= 'Z';
SB_ADDR <= (others=>'Z');
SB_DATA <= (others=>'Z');
SB_CNTL <= (others=>'Z');
CEXT_RXHOLD <= '1';
-- wait for CONF_DONE, plus addional 40 clock cycles (conf+design run up)
while CONF_DONE = '0' loop
wait until rising_edge(CLK);
end loop;
for i in 0 to 39 loop
wait until rising_edge(CLK);
end loop; -- i
writetimestamp(oline, CLK_CYCLE, ": START");
writeline(output, oline);
stim_loop: loop
wait until falling_edge(CLK);
SB_ADDR <= (others=>'Z');
SB_DATA <= (others=>'Z');
RX_VAL <= '0';
CEXT_RXHOLD <= RX_HOLD;
if RX_HOLD = '0' then
irxint := to_integer(signed(CEXT_RXDATA));
if CEXT_RXVAL = '1' then
if irxint <= 16#ff# then -- normal data byte
RX_DATA <= slv(to_unsigned(irxint, 8));
RX_VAL <= '1';
elsif irxint >= 16#1000000# then -- out-of-band message
irxslv := slv(to_unsigned(irxint mod 16#1000000#, 24));
iaddr := irxslv(23 downto 16);
idata := irxslv(15 downto 0);
writetimestamp(oline, CLK_CYCLE, ": OOB-MSG");
write(oline, irxslv(23 downto 16), right, 9);
write(oline, irxslv(15 downto 8), right, 9);
write(oline, irxslv( 7 downto 0), right, 9);
write(oline, string'(" : "));
writeoct(oline, iaddr, right, 3);
writeoct(oline, idata, right, 7);
writeline(output, oline);
if unsigned(iaddr) = 0 then
ibit := to_integer(unsigned(idata(15 downto 8)));
r_sb_cntl(ibit) := idata(0);
else
SB_ADDR <= iaddr;
SB_DATA <= idata;
-- In principle a delta cycle long pulse is enough to make the
-- simbus transfer. A 500 ps long pulse is generated to ensure
-- that SB_VAL is visible in a viewer. That works up to 1 GHz
SB_VAL <= '1';
wait for 500 ps;
SB_VAL <= 'Z';
wait for 0 ps;
end if;
end if;
elsif irxint = -1 then -- end-of-file seen
exit stim_loop;
else
report "rlink_cext_getbyte error: " & integer'image(-irxint)
severity failure;
end if; -- CEXT_RXVAL = '1'
end if; -- RX_HOLD = '0'
SB_CNTL <= r_sb_cntl;
end loop;
-- wait for 50 clock cycles (design run down)
for i in 0 to 49 loop
wait until rising_edge(CLK);
end loop; -- i
writetimestamp(oline, CLK_CYCLE, ": DONE ");
writeline(output, oline);
SB_SIMSTOP <= '1'; -- signal simulation stop
wait for 100 ns; -- monitor grace time
report "Simulation Finished" severity failure; -- end simulation
end process proc_stim;
end sim;
|
--========================================================================================================================
-- Copyright (c) 2017 by Bitvis AS. All rights reserved.
-- You should have received a copy of the license file containing the MIT License (see LICENSE.TXT), if not,
-- contact Bitvis AS <support@bitvis.no>.
--
-- UVVM AND ANY PART THEREOF ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
-- WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS
-- OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
-- OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH UVVM OR THE USE OR OTHER DEALINGS IN UVVM.
--========================================================================================================================
------------------------------------------------------------------------------------------
-- Description : See library quick reference (under 'doc') and README-file(s)
------------------------------------------------------------------------------------------
library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
library uvvm_util;
context uvvm_util.uvvm_util_context;
library uvvm_vvc_framework;
use uvvm_vvc_framework.ti_vvc_framework_support_pkg.all;
use work.axilite_bfm_pkg.all;
use work.vvc_methods_pkg.all;
use work.vvc_cmd_pkg.all;
use work.td_target_support_pkg.all;
use work.td_vvc_entity_support_pkg.all;
use work.td_cmd_queue_pkg.all;
use work.td_result_queue_pkg.all;
--=================================================================================================
entity axilite_vvc is
generic (
GC_ADDR_WIDTH : integer range 1 to C_VVC_CMD_ADDR_MAX_LENGTH := 8;
GC_DATA_WIDTH : integer range 1 to C_VVC_CMD_DATA_MAX_LENGTH := 32;
GC_INSTANCE_IDX : natural := 1; -- Instance index for this AXILITE_VVCT instance
GC_AXILITE_CONFIG : t_axilite_bfm_config := C_AXILITE_BFM_CONFIG_DEFAULT; -- Behavior specification for BFM
GC_CMD_QUEUE_COUNT_MAX : natural := 1000;
GC_CMD_QUEUE_COUNT_THRESHOLD : natural := 950;
GC_CMD_QUEUE_COUNT_THRESHOLD_SEVERITY : t_alert_level := WARNING;
GC_RESULT_QUEUE_COUNT_MAX : natural := 1000;
GC_RESULT_QUEUE_COUNT_THRESHOLD : natural := 950;
GC_RESULT_QUEUE_COUNT_THRESHOLD_SEVERITY : t_alert_level := WARNING
);
port (
clk : in std_logic;
axilite_vvc_master_if : inout t_axilite_if := init_axilite_if_signals(GC_ADDR_WIDTH, GC_DATA_WIDTH)
);
begin
-- Check the interface widths to assure that the interface was correctly set up
assert (axilite_vvc_master_if.write_address_channel.awaddr'length = GC_ADDR_WIDTH) report "axilite_vvc_master_if.write_address_channel.awaddr'length =/ GC_ADDR_WIDTH" severity failure;
assert (axilite_vvc_master_if.read_address_channel.araddr'length = GC_ADDR_WIDTH) report "axilite_vvc_master_if.read_address_channel.araddr'length =/ GC_ADDR_WIDTH" severity failure;
assert (axilite_vvc_master_if.write_data_channel.wdata'length = GC_DATA_WIDTH) report "axilite_vvc_master_if.write_data_channel.wdata'length =/ GC_DATA_WIDTH" severity failure;
assert (axilite_vvc_master_if.write_data_channel.wstrb'length = GC_DATA_WIDTH/8) report "axilite_vvc_master_if.write_data_channel.wstrb'length =/ GC_DATA_WIDTH/8" severity failure;
assert (axilite_vvc_master_if.read_data_channel.rdata'length = GC_DATA_WIDTH) report "axilite_vvc_master_if.read_data_channel.rdata'length =/ GC_DATA_WIDTH" severity failure;
end entity axilite_vvc;
--=================================================================================================
--=================================================================================================
architecture behave of axilite_vvc is
constant C_SCOPE : string := C_VVC_NAME & "," & to_string(GC_INSTANCE_IDX);
constant C_VVC_LABELS : t_vvc_labels := assign_vvc_labels(C_SCOPE, C_VVC_NAME, GC_INSTANCE_IDX, NA);
signal executor_is_busy : boolean := false;
signal queue_is_increasing : boolean := false;
signal last_cmd_idx_executed : natural := 0;
signal terminate_current_cmd : t_flag_record;
-- Instantiation of the element dedicated Queue
shared variable command_queue : work.td_cmd_queue_pkg.t_generic_queue;
shared variable result_queue : work.td_result_queue_pkg.t_generic_queue;
alias vvc_config : t_vvc_config is shared_axilite_vvc_config(GC_INSTANCE_IDX);
alias vvc_status : t_vvc_status is shared_axilite_vvc_status(GC_INSTANCE_IDX);
alias transaction_info : t_transaction_info is shared_axilite_transaction_info(GC_INSTANCE_IDX);
begin
--===============================================================================================
-- Constructor
-- - Set up the defaults and show constructor if enabled
--===============================================================================================
work.td_vvc_entity_support_pkg.vvc_constructor(C_SCOPE, GC_INSTANCE_IDX, vvc_config, command_queue, result_queue, GC_AXILITE_CONFIG,
GC_CMD_QUEUE_COUNT_MAX, GC_CMD_QUEUE_COUNT_THRESHOLD, GC_CMD_QUEUE_COUNT_THRESHOLD_SEVERITY,
GC_RESULT_QUEUE_COUNT_MAX, GC_RESULT_QUEUE_COUNT_THRESHOLD, GC_RESULT_QUEUE_COUNT_THRESHOLD_SEVERITY);
--===============================================================================================
--===============================================================================================
-- Command interpreter
-- - Interpret, decode and acknowledge commands from the central sequencer
--===============================================================================================
cmd_interpreter : process
variable v_cmd_has_been_acked : boolean; -- Indicates if acknowledge_cmd() has been called for the current shared_vvc_cmd
variable v_local_vvc_cmd : t_vvc_cmd_record := C_VVC_CMD_DEFAULT;
begin
-- 0. Initialize the process prior to first command
work.td_vvc_entity_support_pkg.initialize_interpreter(terminate_current_cmd, global_awaiting_completion);
-- initialise shared_vvc_last_received_cmd_idx for channel and instance
shared_vvc_last_received_cmd_idx(NA, GC_INSTANCE_IDX) := 0;
-- Then for every single command from the sequencer
loop -- basically as long as new commands are received
-- 1. wait until command targeted at this VVC. Must match VVC name, instance and channel (if applicable)
-- releases global semaphore
-------------------------------------------------------------------------
work.td_vvc_entity_support_pkg.await_cmd_from_sequencer(C_VVC_LABELS, vvc_config, THIS_VVCT, VVC_BROADCAST, global_vvc_busy, global_vvc_ack, shared_vvc_cmd, v_local_vvc_cmd);
v_cmd_has_been_acked := false; -- Clear flag
-- update shared_vvc_last_received_cmd_idx with received command index
shared_vvc_last_received_cmd_idx(NA, GC_INSTANCE_IDX) := v_local_vvc_cmd.cmd_idx;
-- 2a. Put command on the queue if intended for the executor
-------------------------------------------------------------------------
if v_local_vvc_cmd.command_type = QUEUED then
work.td_vvc_entity_support_pkg.put_command_on_queue(v_local_vvc_cmd, command_queue, vvc_status, queue_is_increasing);
-- 2b. Otherwise command is intended for immediate response
-------------------------------------------------------------------------
elsif v_local_vvc_cmd.command_type = IMMEDIATE then
case v_local_vvc_cmd.operation is
when AWAIT_COMPLETION =>
work.td_vvc_entity_support_pkg.interpreter_await_completion(v_local_vvc_cmd, command_queue, vvc_config, executor_is_busy, C_VVC_LABELS, last_cmd_idx_executed);
when AWAIT_ANY_COMPLETION =>
if not v_local_vvc_cmd.gen_boolean then
-- Called with lastness = NOT_LAST: Acknowledge immediately to let the sequencer continue
work.td_target_support_pkg.acknowledge_cmd(global_vvc_ack,v_local_vvc_cmd.cmd_idx);
v_cmd_has_been_acked := true;
end if;
work.td_vvc_entity_support_pkg.interpreter_await_any_completion(v_local_vvc_cmd, command_queue, vvc_config, executor_is_busy, C_VVC_LABELS, last_cmd_idx_executed, global_awaiting_completion);
when DISABLE_LOG_MSG =>
uvvm_util.methods_pkg.disable_log_msg(v_local_vvc_cmd.msg_id, vvc_config.msg_id_panel, to_string(v_local_vvc_cmd.msg) & format_command_idx(v_local_vvc_cmd), C_SCOPE, v_local_vvc_cmd.quietness);
when ENABLE_LOG_MSG =>
uvvm_util.methods_pkg.enable_log_msg(v_local_vvc_cmd.msg_id, vvc_config.msg_id_panel, to_string(v_local_vvc_cmd.msg) & format_command_idx(v_local_vvc_cmd), C_SCOPE, v_local_vvc_cmd.quietness);
when FLUSH_COMMAND_QUEUE =>
work.td_vvc_entity_support_pkg.interpreter_flush_command_queue(v_local_vvc_cmd, command_queue, vvc_config, vvc_status, C_VVC_LABELS);
when TERMINATE_CURRENT_COMMAND =>
work.td_vvc_entity_support_pkg.interpreter_terminate_current_command(v_local_vvc_cmd, vvc_config, C_VVC_LABELS, terminate_current_cmd);
when FETCH_RESULT =>
work.td_vvc_entity_support_pkg.interpreter_fetch_result(result_queue, v_local_vvc_cmd, vvc_config, C_VVC_LABELS, last_cmd_idx_executed, shared_vvc_response);
when others =>
tb_error("Unsupported command received for IMMEDIATE execution: '" & to_string(v_local_vvc_cmd.operation) & "'", C_SCOPE);
end case;
else
tb_error("command_type is not IMMEDIATE or QUEUED", C_SCOPE);
end if;
-- 3. Acknowledge command after runing or queuing the command
-------------------------------------------------------------------------
if not v_cmd_has_been_acked then
work.td_target_support_pkg.acknowledge_cmd(global_vvc_ack,v_local_vvc_cmd.cmd_idx);
end if;
end loop;
end process;
--===============================================================================================
--===============================================================================================
-- Command executor
-- - Fetch and execute the commands
--===============================================================================================
cmd_executor : process
variable v_cmd : t_vvc_cmd_record;
variable v_read_data : t_vvc_result; -- See vvc_cmd_pkg
variable v_timestamp_start_of_current_bfm_access : time := 0 ns;
variable v_timestamp_start_of_last_bfm_access : time := 0 ns;
variable v_timestamp_end_of_last_bfm_access : time := 0 ns;
variable v_command_is_bfm_access : boolean;
variable v_normalised_addr : unsigned(GC_ADDR_WIDTH-1 downto 0) := (others => '0');
variable v_normalised_data : std_logic_vector(GC_DATA_WIDTH-1 downto 0) := (others => '0');
begin
-- 0. Initialize the process prior to first command
-------------------------------------------------------------------------
work.td_vvc_entity_support_pkg.initialize_executor(terminate_current_cmd);
loop
-- 1. Set defaults, fetch command and log
-------------------------------------------------------------------------
work.td_vvc_entity_support_pkg.fetch_command_and_prepare_executor(v_cmd, command_queue, vvc_config, vvc_status, queue_is_increasing, executor_is_busy, C_VVC_LABELS);
-- Set the transaction info for waveview
transaction_info := C_TRANSACTION_INFO_DEFAULT;
transaction_info.operation := v_cmd.operation;
transaction_info.msg := pad_string(to_string(v_cmd.msg), ' ', transaction_info.msg'length);
-- Check if command is a BFM access
if v_cmd.operation = WRITE or v_cmd.operation = READ or v_cmd.operation = CHECK then
v_command_is_bfm_access := true;
else
v_command_is_bfm_access := false;
end if;
-- Insert delay if needed
work.td_vvc_entity_support_pkg.insert_inter_bfm_delay_if_requested(vvc_config => vvc_config,
command_is_bfm_access => v_command_is_bfm_access,
timestamp_start_of_last_bfm_access => v_timestamp_start_of_last_bfm_access,
timestamp_end_of_last_bfm_access => v_timestamp_end_of_last_bfm_access,
scope => C_SCOPE);
if v_command_is_bfm_access then
v_timestamp_start_of_current_bfm_access := now;
end if;
-- 2. Execute the fetched command
-------------------------------------------------------------------------
case v_cmd.operation is -- Only operations in the dedicated record are relevant
-- VVC dedicated operations
--===================================
when WRITE =>
-- Normalise address and data
v_normalised_addr := normalize_and_check(v_cmd.addr, v_normalised_addr, ALLOW_WIDER_NARROWER, "v_cmd.addr", "v_normalised_addr", "axilite_write() called with to wide address. " & v_cmd.msg);
v_normalised_data := normalize_and_check(v_cmd.data, v_normalised_data, ALLOW_WIDER_NARROWER, "v_cmd.data", "v_normalised_data", "axilite_write() called with to wide data. " & v_cmd.msg);
transaction_info.addr(GC_ADDR_WIDTH - 1 downto 0) := v_normalised_addr;
transaction_info.data(GC_DATA_WIDTH - 1 downto 0) := v_normalised_data;
transaction_info.byte_enable := v_cmd.byte_enable;
-- Call the corresponding procedure in the BFM package.
axilite_write(addr_value => v_normalised_addr,
data_value => v_normalised_data,
byte_enable => v_cmd.byte_enable((GC_DATA_WIDTH/8-1) downto 0),
msg => format_msg(v_cmd),
clk => clk,
axilite_if => axilite_vvc_master_if,
scope => C_SCOPE,
msg_id_panel => vvc_config.msg_id_panel,
config => vvc_config.bfm_config);
when READ =>
-- Normalise address and data
v_normalised_addr := normalize_and_check(v_cmd.addr, v_normalised_addr, ALLOW_WIDER_NARROWER, "v_cmd.addr", "v_normalised_addr", "axilite_read() called with to wide address. " & v_cmd.msg);
transaction_info.addr(GC_ADDR_WIDTH - 1 downto 0) := v_normalised_addr;
-- Call the corresponding procedure in the BFM package.
axilite_read(addr_value => v_normalised_addr,
data_value => v_read_data(GC_DATA_WIDTH-1 downto 0),
msg => format_msg(v_cmd),
clk => clk,
axilite_if => axilite_vvc_master_if,
scope => C_SCOPE,
msg_id_panel => vvc_config.msg_id_panel,
config => vvc_config.bfm_config);
-- Store the result
work.td_vvc_entity_support_pkg.store_result( result_queue => result_queue,
cmd_idx => v_cmd.cmd_idx,
result => v_read_data);
when CHECK =>
-- Normalise address and data
v_normalised_addr := normalize_and_check(v_cmd.addr, v_normalised_addr, ALLOW_WIDER_NARROWER, "v_cmd.addr", "v_normalised_addr", "axilite_check() called with to wide address. " & v_cmd.msg);
v_normalised_data := normalize_and_check(v_cmd.data, v_normalised_data, ALLOW_WIDER_NARROWER, "v_cmd.data", "v_normalised_data", "axilite_check() called with to wide data. " & v_cmd.msg);
transaction_info.addr(GC_ADDR_WIDTH - 1 downto 0) := v_normalised_addr;
transaction_info.data(GC_DATA_WIDTH - 1 downto 0) := v_normalised_data;
-- Call the corresponding procedure in the BFM package.
axilite_check(addr_value => v_normalised_addr,
data_exp => v_normalised_data,
msg => format_msg(v_cmd),
clk => clk,
axilite_if => axilite_vvc_master_if,
alert_level => v_cmd.alert_level,
scope => C_SCOPE,
msg_id_panel => vvc_config.msg_id_panel,
config => vvc_config.bfm_config);
-- UVVM common operations
--===================================
when INSERT_DELAY =>
log(ID_INSERTED_DELAY, "Running: " & to_string(v_cmd.proc_call) & " " & format_command_idx(v_cmd), C_SCOPE, vvc_config.msg_id_panel);
if v_cmd.gen_integer_array(0) = -1 then
-- Delay specified using time
wait until terminate_current_cmd.is_active = '1' for v_cmd.delay;
else
-- Delay specified using integer
wait until terminate_current_cmd.is_active = '1' for v_cmd.gen_integer_array(0) * vvc_config.bfm_config.clock_period;
end if;
when others =>
tb_error("Unsupported local command received for execution: '" & to_string(v_cmd.operation) & "'", C_SCOPE);
end case;
if v_command_is_bfm_access then
v_timestamp_end_of_last_bfm_access := now;
v_timestamp_start_of_last_bfm_access := v_timestamp_start_of_current_bfm_access;
if ((vvc_config.inter_bfm_delay.delay_type = TIME_START2START) and
((now - v_timestamp_start_of_current_bfm_access) > vvc_config.inter_bfm_delay.delay_in_time)) then
alert(vvc_config.inter_bfm_delay.inter_bfm_delay_violation_severity, "BFM access exceeded specified start-to-start inter-bfm delay, " &
to_string(vvc_config.inter_bfm_delay.delay_in_time) & ".", C_SCOPE);
end if;
end if;
last_cmd_idx_executed <= v_cmd.cmd_idx;
-- Reset the transaction info for waveview
transaction_info := C_TRANSACTION_INFO_DEFAULT;
end loop;
end process;
--===============================================================================================
--===============================================================================================
-- Command termination handler
-- - Handles the termination request record (sets and resets terminate flag on request)
--===============================================================================================
cmd_terminator : uvvm_vvc_framework.ti_vvc_framework_support_pkg.flag_handler(terminate_current_cmd); -- flag: is_active, set, reset
--===============================================================================================
end behave;
|
-------------------------------------------------------------------------------
--
-- (C) COPYRIGHT 2004, Gideon's Logic Architectures
--
-------------------------------------------------------------------------------
-- Title : Serial Receiver: 115200/8N1
-------------------------------------------------------------------------------
-- Author : Gideon Zweijtzer <gideon.zweijtzer@gmail.com>
-- Created : Wed Apr 28, 2004
-------------------------------------------------------------------------------
library ieee;
use ieee.std_logic_1164.all;
entity rx is
generic (clks_per_bit : integer := 434); -- 115k2 @ 50 MHz
port (
clk : in std_logic;
reset : in std_logic;
rxd : in std_logic;
rxchar : out std_logic_vector(7 downto 0);
rx_ack : out std_logic );
end rx;
architecture gideon of rx is
signal bitcnt : integer range 0 to 8;
signal bitvec : std_logic_vector(8 downto 0);
signal timer : integer range 0 to clks_per_bit;
type state_t is (Idle, StartBit, Receiving);
signal state : state_t;
signal rxd_c : std_logic;
begin
process(clk, reset)
begin
if clk'event and clk='1' then
rxd_c <= rxd;
rx_ack <= '0';
case state is
when Idle =>
if rxd_c = '0' then
timer <= (clks_per_bit / 2) - 1;
state <= startbit;
end if;
when StartBit =>
if rxd_c = '1' then
state <= Idle;
elsif timer = 0 then
timer <= clks_per_bit - 1;
state <= receiving;
bitcnt <= 8;
else
timer <= timer - 1;
end if;
when Receiving =>
if timer=0 then
timer <= clks_per_bit - 1;
bitvec <= rxd_c & bitvec(8 downto 1);
if bitcnt = 0 then
state <= Idle;
rx_ack <= '1';
else
bitcnt <= bitcnt - 1;
end if;
else
timer <= timer - 1;
end if;
end case;
end if;
if reset='1' then
state <= Idle;
bitcnt <= 0;
timer <= 0;
bitvec <= (others => '0');
end if;
end process;
rxchar <= bitvec(7 downto 0);
end gideon;
|
-------------------------------------------------------------------------------
--
-- (C) COPYRIGHT 2004, Gideon's Logic Architectures
--
-------------------------------------------------------------------------------
-- Title : Serial Receiver: 115200/8N1
-------------------------------------------------------------------------------
-- Author : Gideon Zweijtzer <gideon.zweijtzer@gmail.com>
-- Created : Wed Apr 28, 2004
-------------------------------------------------------------------------------
library ieee;
use ieee.std_logic_1164.all;
entity rx is
generic (clks_per_bit : integer := 434); -- 115k2 @ 50 MHz
port (
clk : in std_logic;
reset : in std_logic;
rxd : in std_logic;
rxchar : out std_logic_vector(7 downto 0);
rx_ack : out std_logic );
end rx;
architecture gideon of rx is
signal bitcnt : integer range 0 to 8;
signal bitvec : std_logic_vector(8 downto 0);
signal timer : integer range 0 to clks_per_bit;
type state_t is (Idle, StartBit, Receiving);
signal state : state_t;
signal rxd_c : std_logic;
begin
process(clk, reset)
begin
if clk'event and clk='1' then
rxd_c <= rxd;
rx_ack <= '0';
case state is
when Idle =>
if rxd_c = '0' then
timer <= (clks_per_bit / 2) - 1;
state <= startbit;
end if;
when StartBit =>
if rxd_c = '1' then
state <= Idle;
elsif timer = 0 then
timer <= clks_per_bit - 1;
state <= receiving;
bitcnt <= 8;
else
timer <= timer - 1;
end if;
when Receiving =>
if timer=0 then
timer <= clks_per_bit - 1;
bitvec <= rxd_c & bitvec(8 downto 1);
if bitcnt = 0 then
state <= Idle;
rx_ack <= '1';
else
bitcnt <= bitcnt - 1;
end if;
else
timer <= timer - 1;
end if;
end case;
end if;
if reset='1' then
state <= Idle;
bitcnt <= 0;
timer <= 0;
bitvec <= (others => '0');
end if;
end process;
rxchar <= bitvec(7 downto 0);
end gideon;
|
-------------------------------------------------------------------------------
--
-- (C) COPYRIGHT 2004, Gideon's Logic Architectures
--
-------------------------------------------------------------------------------
-- Title : Serial Receiver: 115200/8N1
-------------------------------------------------------------------------------
-- Author : Gideon Zweijtzer <gideon.zweijtzer@gmail.com>
-- Created : Wed Apr 28, 2004
-------------------------------------------------------------------------------
library ieee;
use ieee.std_logic_1164.all;
entity rx is
generic (clks_per_bit : integer := 434); -- 115k2 @ 50 MHz
port (
clk : in std_logic;
reset : in std_logic;
rxd : in std_logic;
rxchar : out std_logic_vector(7 downto 0);
rx_ack : out std_logic );
end rx;
architecture gideon of rx is
signal bitcnt : integer range 0 to 8;
signal bitvec : std_logic_vector(8 downto 0);
signal timer : integer range 0 to clks_per_bit;
type state_t is (Idle, StartBit, Receiving);
signal state : state_t;
signal rxd_c : std_logic;
begin
process(clk, reset)
begin
if clk'event and clk='1' then
rxd_c <= rxd;
rx_ack <= '0';
case state is
when Idle =>
if rxd_c = '0' then
timer <= (clks_per_bit / 2) - 1;
state <= startbit;
end if;
when StartBit =>
if rxd_c = '1' then
state <= Idle;
elsif timer = 0 then
timer <= clks_per_bit - 1;
state <= receiving;
bitcnt <= 8;
else
timer <= timer - 1;
end if;
when Receiving =>
if timer=0 then
timer <= clks_per_bit - 1;
bitvec <= rxd_c & bitvec(8 downto 1);
if bitcnt = 0 then
state <= Idle;
rx_ack <= '1';
else
bitcnt <= bitcnt - 1;
end if;
else
timer <= timer - 1;
end if;
end case;
end if;
if reset='1' then
state <= Idle;
bitcnt <= 0;
timer <= 0;
bitvec <= (others => '0');
end if;
end process;
rxchar <= bitvec(7 downto 0);
end gideon;
|
-------------------------------------------------------------------------------
--
-- (C) COPYRIGHT 2004, Gideon's Logic Architectures
--
-------------------------------------------------------------------------------
-- Title : Serial Receiver: 115200/8N1
-------------------------------------------------------------------------------
-- Author : Gideon Zweijtzer <gideon.zweijtzer@gmail.com>
-- Created : Wed Apr 28, 2004
-------------------------------------------------------------------------------
library ieee;
use ieee.std_logic_1164.all;
entity rx is
generic (clks_per_bit : integer := 434); -- 115k2 @ 50 MHz
port (
clk : in std_logic;
reset : in std_logic;
rxd : in std_logic;
rxchar : out std_logic_vector(7 downto 0);
rx_ack : out std_logic );
end rx;
architecture gideon of rx is
signal bitcnt : integer range 0 to 8;
signal bitvec : std_logic_vector(8 downto 0);
signal timer : integer range 0 to clks_per_bit;
type state_t is (Idle, StartBit, Receiving);
signal state : state_t;
signal rxd_c : std_logic;
begin
process(clk, reset)
begin
if clk'event and clk='1' then
rxd_c <= rxd;
rx_ack <= '0';
case state is
when Idle =>
if rxd_c = '0' then
timer <= (clks_per_bit / 2) - 1;
state <= startbit;
end if;
when StartBit =>
if rxd_c = '1' then
state <= Idle;
elsif timer = 0 then
timer <= clks_per_bit - 1;
state <= receiving;
bitcnt <= 8;
else
timer <= timer - 1;
end if;
when Receiving =>
if timer=0 then
timer <= clks_per_bit - 1;
bitvec <= rxd_c & bitvec(8 downto 1);
if bitcnt = 0 then
state <= Idle;
rx_ack <= '1';
else
bitcnt <= bitcnt - 1;
end if;
else
timer <= timer - 1;
end if;
end case;
end if;
if reset='1' then
state <= Idle;
bitcnt <= 0;
timer <= 0;
bitvec <= (others => '0');
end if;
end process;
rxchar <= bitvec(7 downto 0);
end gideon;
|
-- -------------------------------------------------------------
--
-- Generated Architecture Declaration for rtl of ent_b
--
-- Generated
-- by: wig
-- on: Thu Jun 29 16:41:09 2006
-- cmd: /cygdrive/h/work/eclipse/MIX/mix_0.pl -conf macro._MP_VHDL_USE_ENTY_MP_=Overwritten vhdl_enty from cmdline -conf macro._MP_VHDL_HOOK_ARCH_BODY_MP_=Use macro vhdl_hook_arch_body -conf macro._MP_ADD_MY_OWN_MP_=overloading my own macro ../../configuration.xls
--
-- !!! Do not edit this file! Autogenerated by MIX !!!
-- $Author: wig $
-- $Id: ent_b-rtl-a.vhd,v 1.1 2006/07/04 09:54:10 wig Exp $
-- $Date: 2006/07/04 09:54:10 $
-- $Log: ent_b-rtl-a.vhd,v $
-- Revision 1.1 2006/07/04 09:54:10 wig
-- Update more testcases, add configuration/cfgfile
--
--
-- Based on Mix Architecture Template built into RCSfile: MixWriter.pm,v
-- Id: MixWriter.pm,v 1.90 2006/06/22 07:13:21 wig Exp
--
-- Generator: mix_0.pl Revision: 1.46 , wilfried.gaensheimer@micronas.com
-- (C) 2003,2005 Micronas GmbH
--
-- --------------------------------------------------------------
-- modifiy vhdl_use_arch
library IEEE;
use IEEE.std_logic_1164.all;
-- No project specific VHDL libraries/arch
typedef vhdl_use_arch_def std_ulogic_vector;
-- end of vhdl_use_arch
--
--
-- Start of Generated Architecture rtl of ent_b
--
architecture rtl of ent_b is
--
-- Generated Constant Declarations
--
--
-- Generated Components
--
component ent_ba
-- No Generated Generics
-- No Generated Port
end component;
-- ---------
component ent_bb
-- No Generated Generics
-- No Generated Port
end component;
-- ---------
--
-- Generated Signal List
--
--
-- End of Generated Signal List
--
begin
Use macro vhdl_hook_arch_body
--
-- Generated Concurrent Statements
--
--
-- Generated Signal Assignments
--
--
-- Generated Instances and Port Mappings
--
-- Generated Instance Port Map for inst_ba
inst_ba: ent_ba
;
-- End of Generated Instance Port Map for inst_ba
-- Generated Instance Port Map for inst_bb
inst_bb: ent_bb
;
-- End of Generated Instance Port Map for inst_bb
end rtl;
--
--!End of Architecture/s
-- --------------------------------------------------------------
|
-- Copyright 1986-2015 Xilinx, Inc. All Rights Reserved.
-- --------------------------------------------------------------------------------
-- Tool Version: Vivado v.2015.4 (lin64) Build 1412921 Wed Nov 18 09:44:32 MST 2015
-- Date : Thu Aug 25 17:34:55 2016
-- Host : fpgaserv running 64-bit Ubuntu 14.04.4 LTS
-- Command : write_vhdl -force -mode synth_stub
-- /home/kobayashi/PCIe_test/branches/IEICE/4-way_2-tree/src/ip_pcie/PCIeGen2x8If128_stub.vhdl
-- Design : PCIeGen2x8If128
-- Purpose : Stub declaration of top-level module interface
-- Device : xc7vx485tffg1761-2
-- --------------------------------------------------------------------------------
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
entity PCIeGen2x8If128 is
Port (
pci_exp_txp : out STD_LOGIC_VECTOR ( 7 downto 0 );
pci_exp_txn : out STD_LOGIC_VECTOR ( 7 downto 0 );
pci_exp_rxp : in STD_LOGIC_VECTOR ( 7 downto 0 );
pci_exp_rxn : in STD_LOGIC_VECTOR ( 7 downto 0 );
user_clk_out : out STD_LOGIC;
user_reset_out : out STD_LOGIC;
user_lnk_up : out STD_LOGIC;
user_app_rdy : out STD_LOGIC;
tx_buf_av : out STD_LOGIC_VECTOR ( 5 downto 0 );
tx_cfg_req : out STD_LOGIC;
tx_err_drop : out STD_LOGIC;
s_axis_tx_tready : out STD_LOGIC;
s_axis_tx_tdata : in STD_LOGIC_VECTOR ( 127 downto 0 );
s_axis_tx_tkeep : in STD_LOGIC_VECTOR ( 15 downto 0 );
s_axis_tx_tlast : in STD_LOGIC;
s_axis_tx_tvalid : in STD_LOGIC;
s_axis_tx_tuser : in STD_LOGIC_VECTOR ( 3 downto 0 );
tx_cfg_gnt : in STD_LOGIC;
m_axis_rx_tdata : out STD_LOGIC_VECTOR ( 127 downto 0 );
m_axis_rx_tkeep : out STD_LOGIC_VECTOR ( 15 downto 0 );
m_axis_rx_tlast : out STD_LOGIC;
m_axis_rx_tvalid : out STD_LOGIC;
m_axis_rx_tready : in STD_LOGIC;
m_axis_rx_tuser : out STD_LOGIC_VECTOR ( 21 downto 0 );
rx_np_ok : in STD_LOGIC;
rx_np_req : in STD_LOGIC;
fc_cpld : out STD_LOGIC_VECTOR ( 11 downto 0 );
fc_cplh : out STD_LOGIC_VECTOR ( 7 downto 0 );
fc_npd : out STD_LOGIC_VECTOR ( 11 downto 0 );
fc_nph : out STD_LOGIC_VECTOR ( 7 downto 0 );
fc_pd : out STD_LOGIC_VECTOR ( 11 downto 0 );
fc_ph : out STD_LOGIC_VECTOR ( 7 downto 0 );
fc_sel : in STD_LOGIC_VECTOR ( 2 downto 0 );
cfg_status : out STD_LOGIC_VECTOR ( 15 downto 0 );
cfg_command : out STD_LOGIC_VECTOR ( 15 downto 0 );
cfg_dstatus : out STD_LOGIC_VECTOR ( 15 downto 0 );
cfg_dcommand : out STD_LOGIC_VECTOR ( 15 downto 0 );
cfg_lstatus : out STD_LOGIC_VECTOR ( 15 downto 0 );
cfg_lcommand : out STD_LOGIC_VECTOR ( 15 downto 0 );
cfg_dcommand2 : out STD_LOGIC_VECTOR ( 15 downto 0 );
cfg_pcie_link_state : out STD_LOGIC_VECTOR ( 2 downto 0 );
cfg_pmcsr_pme_en : out STD_LOGIC;
cfg_pmcsr_powerstate : out STD_LOGIC_VECTOR ( 1 downto 0 );
cfg_pmcsr_pme_status : out STD_LOGIC;
cfg_received_func_lvl_rst : out STD_LOGIC;
cfg_trn_pending : in STD_LOGIC;
cfg_pm_halt_aspm_l0s : in STD_LOGIC;
cfg_pm_halt_aspm_l1 : in STD_LOGIC;
cfg_pm_force_state_en : in STD_LOGIC;
cfg_pm_force_state : in STD_LOGIC_VECTOR ( 1 downto 0 );
cfg_dsn : in STD_LOGIC_VECTOR ( 63 downto 0 );
cfg_interrupt : in STD_LOGIC;
cfg_interrupt_rdy : out STD_LOGIC;
cfg_interrupt_assert : in STD_LOGIC;
cfg_interrupt_di : in STD_LOGIC_VECTOR ( 7 downto 0 );
cfg_interrupt_do : out STD_LOGIC_VECTOR ( 7 downto 0 );
cfg_interrupt_mmenable : out STD_LOGIC_VECTOR ( 2 downto 0 );
cfg_interrupt_msienable : out STD_LOGIC;
cfg_interrupt_msixenable : out STD_LOGIC;
cfg_interrupt_msixfm : out STD_LOGIC;
cfg_interrupt_stat : in STD_LOGIC;
cfg_pciecap_interrupt_msgnum : in STD_LOGIC_VECTOR ( 4 downto 0 );
cfg_to_turnoff : out STD_LOGIC;
cfg_turnoff_ok : in STD_LOGIC;
cfg_bus_number : out STD_LOGIC_VECTOR ( 7 downto 0 );
cfg_device_number : out STD_LOGIC_VECTOR ( 4 downto 0 );
cfg_function_number : out STD_LOGIC_VECTOR ( 2 downto 0 );
cfg_pm_wake : in STD_LOGIC;
cfg_pm_send_pme_to : in STD_LOGIC;
cfg_ds_bus_number : in STD_LOGIC_VECTOR ( 7 downto 0 );
cfg_ds_device_number : in STD_LOGIC_VECTOR ( 4 downto 0 );
cfg_ds_function_number : in STD_LOGIC_VECTOR ( 2 downto 0 );
cfg_bridge_serr_en : out STD_LOGIC;
cfg_slot_control_electromech_il_ctl_pulse : out STD_LOGIC;
cfg_root_control_syserr_corr_err_en : out STD_LOGIC;
cfg_root_control_syserr_non_fatal_err_en : out STD_LOGIC;
cfg_root_control_syserr_fatal_err_en : out STD_LOGIC;
cfg_root_control_pme_int_en : out STD_LOGIC;
cfg_aer_rooterr_corr_err_reporting_en : out STD_LOGIC;
cfg_aer_rooterr_non_fatal_err_reporting_en : out STD_LOGIC;
cfg_aer_rooterr_fatal_err_reporting_en : out STD_LOGIC;
cfg_aer_rooterr_corr_err_received : out STD_LOGIC;
cfg_aer_rooterr_non_fatal_err_received : out STD_LOGIC;
cfg_aer_rooterr_fatal_err_received : out STD_LOGIC;
cfg_vc_tcvc_map : out STD_LOGIC_VECTOR ( 6 downto 0 );
sys_clk : in STD_LOGIC;
sys_rst_n : in STD_LOGIC
);
end PCIeGen2x8If128;
architecture stub of PCIeGen2x8If128 is
attribute syn_black_box : boolean;
attribute black_box_pad_pin : string;
attribute syn_black_box of stub : architecture is true;
attribute black_box_pad_pin of stub : architecture is "pci_exp_txp[7:0],pci_exp_txn[7:0],pci_exp_rxp[7:0],pci_exp_rxn[7:0],user_clk_out,user_reset_out,user_lnk_up,user_app_rdy,tx_buf_av[5:0],tx_cfg_req,tx_err_drop,s_axis_tx_tready,s_axis_tx_tdata[127:0],s_axis_tx_tkeep[15:0],s_axis_tx_tlast,s_axis_tx_tvalid,s_axis_tx_tuser[3:0],tx_cfg_gnt,m_axis_rx_tdata[127:0],m_axis_rx_tkeep[15:0],m_axis_rx_tlast,m_axis_rx_tvalid,m_axis_rx_tready,m_axis_rx_tuser[21:0],rx_np_ok,rx_np_req,fc_cpld[11:0],fc_cplh[7:0],fc_npd[11:0],fc_nph[7:0],fc_pd[11:0],fc_ph[7:0],fc_sel[2:0],cfg_status[15:0],cfg_command[15:0],cfg_dstatus[15:0],cfg_dcommand[15:0],cfg_lstatus[15:0],cfg_lcommand[15:0],cfg_dcommand2[15:0],cfg_pcie_link_state[2:0],cfg_pmcsr_pme_en,cfg_pmcsr_powerstate[1:0],cfg_pmcsr_pme_status,cfg_received_func_lvl_rst,cfg_trn_pending,cfg_pm_halt_aspm_l0s,cfg_pm_halt_aspm_l1,cfg_pm_force_state_en,cfg_pm_force_state[1:0],cfg_dsn[63:0],cfg_interrupt,cfg_interrupt_rdy,cfg_interrupt_assert,cfg_interrupt_di[7:0],cfg_interrupt_do[7:0],cfg_interrupt_mmenable[2:0],cfg_interrupt_msienable,cfg_interrupt_msixenable,cfg_interrupt_msixfm,cfg_interrupt_stat,cfg_pciecap_interrupt_msgnum[4:0],cfg_to_turnoff,cfg_turnoff_ok,cfg_bus_number[7:0],cfg_device_number[4:0],cfg_function_number[2:0],cfg_pm_wake,cfg_pm_send_pme_to,cfg_ds_bus_number[7:0],cfg_ds_device_number[4:0],cfg_ds_function_number[2:0],cfg_bridge_serr_en,cfg_slot_control_electromech_il_ctl_pulse,cfg_root_control_syserr_corr_err_en,cfg_root_control_syserr_non_fatal_err_en,cfg_root_control_syserr_fatal_err_en,cfg_root_control_pme_int_en,cfg_aer_rooterr_corr_err_reporting_en,cfg_aer_rooterr_non_fatal_err_reporting_en,cfg_aer_rooterr_fatal_err_reporting_en,cfg_aer_rooterr_corr_err_received,cfg_aer_rooterr_non_fatal_err_received,cfg_aer_rooterr_fatal_err_received,cfg_vc_tcvc_map[6:0],sys_clk,sys_rst_n";
attribute X_CORE_INFO : string;
attribute X_CORE_INFO of stub : architecture is "PCIeGen2x8If128_pcie2_top,Vivado 2015.4";
begin
end;
|
--------------------------------------------------------------------------------
-- This file is owned and controlled by Xilinx and must be used solely --
-- for design, simulation, implementation and creation of design files --
-- limited to Xilinx devices or technologies. Use with non-Xilinx --
-- devices or technologies is expressly prohibited and immediately --
-- terminates your license. --
-- --
-- XILINX IS PROVIDING THIS DESIGN, CODE, OR INFORMATION "AS IS" SOLELY --
-- FOR USE IN DEVELOPING PROGRAMS AND SOLUTIONS FOR XILINX DEVICES. BY --
-- PROVIDING THIS DESIGN, CODE, OR INFORMATION AS ONE POSSIBLE --
-- IMPLEMENTATION OF THIS FEATURE, APPLICATION OR STANDARD, XILINX IS --
-- MAKING NO REPRESENTATION THAT THIS IMPLEMENTATION IS FREE FROM ANY --
-- CLAIMS OF INFRINGEMENT, AND YOU ARE RESPONSIBLE FOR OBTAINING ANY --
-- RIGHTS YOU MAY REQUIRE FOR YOUR IMPLEMENTATION. XILINX EXPRESSLY --
-- DISCLAIMS ANY WARRANTY WHATSOEVER WITH RESPECT TO THE ADEQUACY OF THE --
-- IMPLEMENTATION, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OR --
-- REPRESENTATIONS THAT THIS IMPLEMENTATION IS FREE FROM CLAIMS OF --
-- INFRINGEMENT, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A --
-- PARTICULAR PURPOSE. --
-- --
-- Xilinx products are not intended for use in life support appliances, --
-- devices, or systems. Use in such applications are expressly --
-- prohibited. --
-- --
-- (c) Copyright 1995-2014 Xilinx, Inc. --
-- All rights reserved. --
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
-- You must compile the wrapper file blk_mem_gen_v7_3.vhd when simulating
-- the core, blk_mem_gen_v7_3. When compiling the wrapper file, be sure to
-- reference the XilinxCoreLib VHDL simulation library. For detailed
-- instructions, please refer to the "CORE Generator Help".
-- The synthesis directives "translate_off/translate_on" specified
-- below are supported by Xilinx, Mentor Graphics and Synplicity
-- synthesis tools. Ensure they are correct for your synthesis tool(s).
LIBRARY ieee;
USE ieee.std_logic_1164.ALL;
-- synthesis translate_off
LIBRARY XilinxCoreLib;
-- synthesis translate_on
ENTITY blk_mem_gen_v7_3 IS
PORT (
clka : IN STD_LOGIC;
addra : IN STD_LOGIC_VECTOR(9 DOWNTO 0);
douta : OUT STD_LOGIC_VECTOR(6 DOWNTO 0)
);
END blk_mem_gen_v7_3;
ARCHITECTURE blk_mem_gen_v7_3_a OF blk_mem_gen_v7_3 IS
-- synthesis translate_off
COMPONENT wrapped_blk_mem_gen_v7_3
PORT (
clka : IN STD_LOGIC;
addra : IN STD_LOGIC_VECTOR(9 DOWNTO 0);
douta : OUT STD_LOGIC_VECTOR(6 DOWNTO 0)
);
END COMPONENT;
-- Configuration specification
FOR ALL : wrapped_blk_mem_gen_v7_3 USE ENTITY XilinxCoreLib.blk_mem_gen_v7_3(behavioral)
GENERIC MAP (
c_addra_width => 10,
c_addrb_width => 10,
c_algorithm => 1,
c_axi_id_width => 4,
c_axi_slave_type => 0,
c_axi_type => 1,
c_byte_size => 9,
c_common_clk => 0,
c_default_data => "0",
c_disable_warn_bhv_coll => 0,
c_disable_warn_bhv_range => 0,
c_enable_32bit_address => 0,
c_family => "spartan6",
c_has_axi_id => 0,
c_has_ena => 0,
c_has_enb => 0,
c_has_injecterr => 0,
c_has_mem_output_regs_a => 0,
c_has_mem_output_regs_b => 0,
c_has_mux_output_regs_a => 0,
c_has_mux_output_regs_b => 0,
c_has_regcea => 0,
c_has_regceb => 0,
c_has_rsta => 0,
c_has_rstb => 0,
c_has_softecc_input_regs_a => 0,
c_has_softecc_output_regs_b => 0,
c_init_file => "BlankString",
c_init_file_name => "blk_mem_gen_v7_3.mif",
c_inita_val => "0",
c_initb_val => "0",
c_interface_type => 0,
c_load_init_file => 1,
c_mem_type => 3,
c_mux_pipeline_stages => 0,
c_prim_type => 1,
c_read_depth_a => 1024,
c_read_depth_b => 1024,
c_read_width_a => 7,
c_read_width_b => 7,
c_rst_priority_a => "CE",
c_rst_priority_b => "CE",
c_rst_type => "SYNC",
c_rstram_a => 0,
c_rstram_b => 0,
c_sim_collision_check => "ALL",
c_use_bram_block => 0,
c_use_byte_wea => 0,
c_use_byte_web => 0,
c_use_default_data => 0,
c_use_ecc => 0,
c_use_softecc => 0,
c_wea_width => 1,
c_web_width => 1,
c_write_depth_a => 1024,
c_write_depth_b => 1024,
c_write_mode_a => "WRITE_FIRST",
c_write_mode_b => "WRITE_FIRST",
c_write_width_a => 7,
c_write_width_b => 7,
c_xdevicefamily => "spartan6"
);
-- synthesis translate_on
BEGIN
-- synthesis translate_off
U0 : wrapped_blk_mem_gen_v7_3
PORT MAP (
clka => clka,
addra => addra,
douta => douta
);
-- synthesis translate_on
END blk_mem_gen_v7_3_a;
|
-- -------------------------------------------------------------
--
-- Entity Declaration for inst_a_e
--
-- Generated
-- by: wig
-- on: Mon Mar 22 13:27:59 2004
-- cmd: H:\work\mix_new\mix\mix_0.pl -strip -nodelta ../../mde_tests.xls
--
-- !!! Do not edit this file! Autogenerated by MIX !!!
-- $Author: wig $
-- $Id: inst_a_e-e.vhd,v 1.1 2004/04/06 10:50:36 wig Exp $
-- $Date: 2004/04/06 10:50:36 $
-- $Log: inst_a_e-e.vhd,v $
-- Revision 1.1 2004/04/06 10:50:36 wig
-- Adding result/mde_tests
--
--
-- Based on Mix Entity Template built into RCSfile: MixWriter.pm,v
-- Id: MixWriter.pm,v 1.37 2003/12/23 13:25:21 abauer Exp
--
-- Generator: mix_0.pl Version: Revision: 1.26 , wilfried.gaensheimer@micronas.com
-- (C) 2003 Micronas GmbH
--
-- --------------------------------------------------------------
library IEEE;
use IEEE.std_logic_1164.all;
-- No project specific VHDL libraries/enty
--
--
-- Start of Generated Entity inst_a_e
--
entity inst_a_e is
-- Generics:
-- No Generated Generics for Entity inst_a_e
-- Generated Port Declaration:
-- No Generated Port for Entity inst_a_e
end inst_a_e;
--
-- End of Generated Entity inst_a_e
--
--
--!End of Entity/ies
-- --------------------------------------------------------------
|
-- Copyright (C) 2001 Bill Billowitch.
-- Some of the work to develop this test suite was done with Air Force
-- support. The Air Force and Bill Billowitch assume no
-- responsibilities for this software.
-- This file is part of VESTs (Vhdl tESTs).
-- VESTs is free software; you can redistribute it and/or modify it
-- under the terms of the GNU General Public License as published by the
-- Free Software Foundation; either version 2 of the License, or (at
-- your option) any later version.
-- VESTs is distributed in the hope that it will be useful, but WITHOUT
-- ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
-- FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
-- for more details.
-- You should have received a copy of the GNU General Public License
-- along with VESTs; if not, write to the Free Software Foundation,
-- Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
-- ---------------------------------------------------------------------
--
-- $Id: tc208.vhd,v 1.2 2001-10-26 16:29:45 paw Exp $
-- $Revision: 1.2 $
--
-- ---------------------------------------------------------------------
ENTITY c03s01b00x00p09n01i00208ent IS
END c03s01b00x00p09n01i00208ent;
ARCHITECTURE c03s01b00x00p09n01i00208arch OF c03s01b00x00p09n01i00208ent IS
type week is (Mon, Tue, Wed, Thur, Fri, Sat, Sun);
subtype weekend is integer range 5 to 6;
BEGIN
TESTING: PROCESS
variable k : weekend := 6;
BEGIN
k := 5;
assert NOT(k=5)
report "***PASSED TEST: c03s01b00x00p09n01i00208"
severity NOTE;
assert (k=5)
report "***FAILED TEST: c03s01b00x00p09n01i00208 - Constraints for the subtype declaration must match the base type of integer."
severity ERROR;
wait;
END PROCESS TESTING;
END c03s01b00x00p09n01i00208arch;
|
-- Copyright (C) 2001 Bill Billowitch.
-- Some of the work to develop this test suite was done with Air Force
-- support. The Air Force and Bill Billowitch assume no
-- responsibilities for this software.
-- This file is part of VESTs (Vhdl tESTs).
-- VESTs is free software; you can redistribute it and/or modify it
-- under the terms of the GNU General Public License as published by the
-- Free Software Foundation; either version 2 of the License, or (at
-- your option) any later version.
-- VESTs is distributed in the hope that it will be useful, but WITHOUT
-- ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
-- FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
-- for more details.
-- You should have received a copy of the GNU General Public License
-- along with VESTs; if not, write to the Free Software Foundation,
-- Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
-- ---------------------------------------------------------------------
--
-- $Id: tc208.vhd,v 1.2 2001-10-26 16:29:45 paw Exp $
-- $Revision: 1.2 $
--
-- ---------------------------------------------------------------------
ENTITY c03s01b00x00p09n01i00208ent IS
END c03s01b00x00p09n01i00208ent;
ARCHITECTURE c03s01b00x00p09n01i00208arch OF c03s01b00x00p09n01i00208ent IS
type week is (Mon, Tue, Wed, Thur, Fri, Sat, Sun);
subtype weekend is integer range 5 to 6;
BEGIN
TESTING: PROCESS
variable k : weekend := 6;
BEGIN
k := 5;
assert NOT(k=5)
report "***PASSED TEST: c03s01b00x00p09n01i00208"
severity NOTE;
assert (k=5)
report "***FAILED TEST: c03s01b00x00p09n01i00208 - Constraints for the subtype declaration must match the base type of integer."
severity ERROR;
wait;
END PROCESS TESTING;
END c03s01b00x00p09n01i00208arch;
|
-- Copyright (C) 2001 Bill Billowitch.
-- Some of the work to develop this test suite was done with Air Force
-- support. The Air Force and Bill Billowitch assume no
-- responsibilities for this software.
-- This file is part of VESTs (Vhdl tESTs).
-- VESTs is free software; you can redistribute it and/or modify it
-- under the terms of the GNU General Public License as published by the
-- Free Software Foundation; either version 2 of the License, or (at
-- your option) any later version.
-- VESTs is distributed in the hope that it will be useful, but WITHOUT
-- ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
-- FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
-- for more details.
-- You should have received a copy of the GNU General Public License
-- along with VESTs; if not, write to the Free Software Foundation,
-- Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
-- ---------------------------------------------------------------------
--
-- $Id: tc208.vhd,v 1.2 2001-10-26 16:29:45 paw Exp $
-- $Revision: 1.2 $
--
-- ---------------------------------------------------------------------
ENTITY c03s01b00x00p09n01i00208ent IS
END c03s01b00x00p09n01i00208ent;
ARCHITECTURE c03s01b00x00p09n01i00208arch OF c03s01b00x00p09n01i00208ent IS
type week is (Mon, Tue, Wed, Thur, Fri, Sat, Sun);
subtype weekend is integer range 5 to 6;
BEGIN
TESTING: PROCESS
variable k : weekend := 6;
BEGIN
k := 5;
assert NOT(k=5)
report "***PASSED TEST: c03s01b00x00p09n01i00208"
severity NOTE;
assert (k=5)
report "***FAILED TEST: c03s01b00x00p09n01i00208 - Constraints for the subtype declaration must match the base type of integer."
severity ERROR;
wait;
END PROCESS TESTING;
END c03s01b00x00p09n01i00208arch;
|
-- --------------------------------------------------------------------
--
-- Copyright 1995 by IEEE. All rights reserved.
--
-- This source file is considered by the IEEE to be an essential part of the use
-- of the standard 1076.3 and as such may be distributed without change, except
-- as permitted by the standard. This source file may not be sold or distributed
-- for profit. This package may be modified to include additional data required
-- by tools, but must in no way change the external interfaces or simulation
-- behaviour of the description. It is permissible to add comments and/or
-- attributes to the package declarations, but not to change or delete any
-- original lines of the approved package declaration. The package body may be
-- changed only in accordance with the terms of clauses 7.1 and 7.2 of the
-- standard.
--
-- Title : Standard VHDL Synthesis Package (1076.3, NUMERIC_STD)
--
-- Library : This package shall be compiled into a library symbolically
-- : named IEEE.
--
-- Developers : IEEE DASC Synthesis Working Group, PAR 1076.3
--
-- Purpose : This package defines numeric types and arithmetic functions
-- : for use with synthesis tools. Two numeric types are defined:
-- : -- > UNSIGNED: represents UNSIGNED number in vector form
-- : -- > SIGNED: represents a SIGNED number in vector form
-- : The base element type is type STD_LOGIC.
-- : The leftmost bit is treated as the most significant bit.
-- : Signed vectors are represented in two's complement form.
-- : This package contains overloaded arithmetic operators on
-- : the SIGNED and UNSIGNED types. The package also contains
-- : useful type conversions functions.
-- :
-- : If any argument to a function is a null array, a null array is
-- : returned (exceptions, if any, are noted individually).
--
-- Limitation :
--
-- Note : No declarations or definitions shall be included in,
-- : or excluded from this package. The "package declaration"
-- : defines the types, subtypes and declarations of
-- : NUMERIC_STD. The NUMERIC_STD package body shall be
-- : considered the formal definition of the semantics of
-- : this package. Tool developers may choose to implement
-- : the package body in the most efficient manner available
-- : to them.
--
-- --------------------------------------------------------------------
-- modification history :
-- --------------------------------------------------------------------
-- Version: 2.4
-- Date : 12 April 1995
-- -----------------------------------------------------------------------------
library IEEE;
use IEEE.STD_LOGIC_1164.all;
package NUMERIC_STD is
constant CopyRightNotice: STRING
:= "Copyright 1995 IEEE. All rights reserved.";
--============================================================================
-- Numeric array type definitions
--============================================================================
type UNSIGNED is array (NATURAL range <>) of STD_LOGIC;
type SIGNED is array (NATURAL range <>) of STD_LOGIC;
--============================================================================
-- Arithmetic Operators:
--===========================================================================
-- Id: A.1
function "abs" (ARG: SIGNED) return SIGNED;
-- Result subtype: SIGNED(ARG'LENGTH-1 downto 0).
-- Result: Returns the absolute value of a SIGNED vector ARG.
-- Id: A.2
function "-" (ARG: SIGNED) return SIGNED;
-- Result subtype: SIGNED(ARG'LENGTH-1 downto 0).
-- Result: Returns the value of the unary minus operation on a
-- SIGNED vector ARG.
--============================================================================
-- Id: A.3
function "+" (L, R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(MAX(L'LENGTH, R'LENGTH)-1 downto 0).
-- Result: Adds two UNSIGNED vectors that may be of different lengths.
-- Id: A.4
function "+" (L, R: SIGNED) return SIGNED;
-- Result subtype: SIGNED(MAX(L'LENGTH, R'LENGTH)-1 downto 0).
-- Result: Adds two SIGNED vectors that may be of different lengths.
-- Id: A.5
function "+" (L: UNSIGNED; R: NATURAL) return UNSIGNED;
-- Result subtype: UNSIGNED(L'LENGTH-1 downto 0).
-- Result: Adds an UNSIGNED vector, L, with a non-negative INTEGER, R.
-- Id: A.6
function "+" (L: NATURAL; R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(R'LENGTH-1 downto 0).
-- Result: Adds a non-negative INTEGER, L, with an UNSIGNED vector, R.
-- Id: A.7
function "+" (L: INTEGER; R: SIGNED) return SIGNED;
-- Result subtype: SIGNED(R'LENGTH-1 downto 0).
-- Result: Adds an INTEGER, L(may be positive or negative), to a SIGNED
-- vector, R.
-- Id: A.8
function "+" (L: SIGNED; R: INTEGER) return SIGNED;
-- Result subtype: SIGNED(L'LENGTH-1 downto 0).
-- Result: Adds a SIGNED vector, L, to an INTEGER, R.
--============================================================================
-- Id: A.9
function "-" (L, R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(MAX(L'LENGTH, R'LENGTH)-1 downto 0).
-- Result: Subtracts two UNSIGNED vectors that may be of different lengths.
-- Id: A.10
function "-" (L, R: SIGNED) return SIGNED;
-- Result subtype: SIGNED(MAX(L'LENGTH, R'LENGTH)-1 downto 0).
-- Result: Subtracts a SIGNED vector, R, from another SIGNED vector, L,
-- that may possibly be of different lengths.
-- Id: A.11
function "-" (L: UNSIGNED;R: NATURAL) return UNSIGNED;
-- Result subtype: UNSIGNED(L'LENGTH-1 downto 0).
-- Result: Subtracts a non-negative INTEGER, R, from an UNSIGNED vector, L.
-- Id: A.12
function "-" (L: NATURAL; R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(R'LENGTH-1 downto 0).
-- Result: Subtracts an UNSIGNED vector, R, from a non-negative INTEGER, L.
-- Id: A.13
function "-" (L: SIGNED; R: INTEGER) return SIGNED;
-- Result subtype: SIGNED(L'LENGTH-1 downto 0).
-- Result: Subtracts an INTEGER, R, from a SIGNED vector, L.
-- Id: A.14
function "-" (L: INTEGER; R: SIGNED) return SIGNED;
-- Result subtype: SIGNED(R'LENGTH-1 downto 0).
-- Result: Subtracts a SIGNED vector, R, from an INTEGER, L.
--============================================================================
-- Id: A.15
function "*" (L, R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED((L'LENGTH+R'LENGTH-1) downto 0).
-- Result: Performs the multiplication operation on two UNSIGNED vectors
-- that may possibly be of different lengths.
-- Id: A.16
function "*" (L, R: SIGNED) return SIGNED;
-- Result subtype: SIGNED((L'LENGTH+R'LENGTH-1) downto 0)
-- Result: Multiplies two SIGNED vectors that may possibly be of
-- different lengths.
-- Id: A.17
function "*" (L: UNSIGNED; R: NATURAL) return UNSIGNED;
-- Result subtype: UNSIGNED((L'LENGTH+L'LENGTH-1) downto 0).
-- Result: Multiplies an UNSIGNED vector, L, with a non-negative
-- INTEGER, R. R is converted to an UNSIGNED vector of
-- SIZE L'LENGTH before multiplication.
-- Id: A.18
function "*" (L: NATURAL; R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED((R'LENGTH+R'LENGTH-1) downto 0).
-- Result: Multiplies an UNSIGNED vector, R, with a non-negative
-- INTEGER, L. L is converted to an UNSIGNED vector of
-- SIZE R'LENGTH before multiplication.
-- Id: A.19
function "*" (L: SIGNED; R: INTEGER) return SIGNED;
-- Result subtype: SIGNED((L'LENGTH+L'LENGTH-1) downto 0)
-- Result: Multiplies a SIGNED vector, L, with an INTEGER, R. R is
-- converted to a SIGNED vector of SIZE L'LENGTH before
-- multiplication.
-- Id: A.20
function "*" (L: INTEGER; R: SIGNED) return SIGNED;
-- Result subtype: SIGNED((R'LENGTH+R'LENGTH-1) downto 0)
-- Result: Multiplies a SIGNED vector, R, with an INTEGER, L. L is
-- converted to a SIGNED vector of SIZE R'LENGTH before
-- multiplication.
--============================================================================
--
-- NOTE: If second argument is zero for "/" operator, a severity level
-- of ERROR is issued.
-- Id: A.21
function "/" (L, R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(L'LENGTH-1 downto 0)
-- Result: Divides an UNSIGNED vector, L, by another UNSIGNED vector, R.
-- Id: A.22
function "/" (L, R: SIGNED) return SIGNED;
-- Result subtype: SIGNED(L'LENGTH-1 downto 0)
-- Result: Divides an SIGNED vector, L, by another SIGNED vector, R.
-- Id: A.23
function "/" (L: UNSIGNED; R: NATURAL) return UNSIGNED;
-- Result subtype: UNSIGNED(L'LENGTH-1 downto 0)
-- Result: Divides an UNSIGNED vector, L, by a non-negative INTEGER, R.
-- If NO_OF_BITS(R) > L'LENGTH, result is truncated to L'LENGTH.
-- Id: A.24
function "/" (L: NATURAL; R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(R'LENGTH-1 downto 0)
-- Result: Divides a non-negative INTEGER, L, by an UNSIGNED vector, R.
-- If NO_OF_BITS(L) > R'LENGTH, result is truncated to R'LENGTH.
-- Id: A.25
function "/" (L: SIGNED; R: INTEGER) return SIGNED;
-- Result subtype: SIGNED(L'LENGTH-1 downto 0)
-- Result: Divides a SIGNED vector, L, by an INTEGER, R.
-- If NO_OF_BITS(R) > L'LENGTH, result is truncated to L'LENGTH.
-- Id: A.26
function "/" (L: INTEGER; R: SIGNED) return SIGNED;
-- Result subtype: SIGNED(R'LENGTH-1 downto 0)
-- Result: Divides an INTEGER, L, by a SIGNED vector, R.
-- If NO_OF_BITS(L) > R'LENGTH, result is truncated to R'LENGTH.
--============================================================================
--
-- NOTE: If second argument is zero for "rem" operator, a severity level
-- of ERROR is issued.
-- Id: A.27
function "rem" (L, R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(R'LENGTH-1 downto 0)
-- Result: Computes "L rem R" where L and R are UNSIGNED vectors.
-- Id: A.28
function "rem" (L, R: SIGNED) return SIGNED;
-- Result subtype: SIGNED(R'LENGTH-1 downto 0)
-- Result: Computes "L rem R" where L and R are SIGNED vectors.
-- Id: A.29
function "rem" (L: UNSIGNED; R: NATURAL) return UNSIGNED;
-- Result subtype: UNSIGNED(L'LENGTH-1 downto 0)
-- Result: Computes "L rem R" where L is an UNSIGNED vector and R is a
-- non-negative INTEGER.
-- If NO_OF_BITS(R) > L'LENGTH, result is truncated to L'LENGTH.
-- Id: A.30
function "rem" (L: NATURAL; R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(R'LENGTH-1 downto 0)
-- Result: Computes "L rem R" where R is an UNSIGNED vector and L is a
-- non-negative INTEGER.
-- If NO_OF_BITS(L) > R'LENGTH, result is truncated to R'LENGTH.
-- Id: A.31
function "rem" (L: SIGNED; R: INTEGER) return SIGNED;
-- Result subtype: SIGNED(L'LENGTH-1 downto 0)
-- Result: Computes "L rem R" where L is SIGNED vector and R is an INTEGER.
-- If NO_OF_BITS(R) > L'LENGTH, result is truncated to L'LENGTH.
-- Id: A.32
function "rem" (L: INTEGER; R: SIGNED) return SIGNED;
-- Result subtype: SIGNED(R'LENGTH-1 downto 0)
-- Result: Computes "L rem R" where R is SIGNED vector and L is an INTEGER.
-- If NO_OF_BITS(L) > R'LENGTH, result is truncated to R'LENGTH.
--============================================================================
--
-- NOTE: If second argument is zero for "mod" operator, a severity level
-- of ERROR is issued.
-- Id: A.33
function "mod" (L, R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(R'LENGTH-1 downto 0)
-- Result: Computes "L mod R" where L and R are UNSIGNED vectors.
-- Id: A.34
function "mod" (L, R: SIGNED) return SIGNED;
-- Result subtype: SIGNED(R'LENGTH-1 downto 0)
-- Result: Computes "L mod R" where L and R are SIGNED vectors.
-- Id: A.35
function "mod" (L: UNSIGNED; R: NATURAL) return UNSIGNED;
-- Result subtype: UNSIGNED(L'LENGTH-1 downto 0)
-- Result: Computes "L mod R" where L is an UNSIGNED vector and R
-- is a non-negative INTEGER.
-- If NO_OF_BITS(R) > L'LENGTH, result is truncated to L'LENGTH.
-- Id: A.36
function "mod" (L: NATURAL; R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(R'LENGTH-1 downto 0)
-- Result: Computes "L mod R" where R is an UNSIGNED vector and L
-- is a non-negative INTEGER.
-- If NO_OF_BITS(L) > R'LENGTH, result is truncated to R'LENGTH.
-- Id: A.37
function "mod" (L: SIGNED; R: INTEGER) return SIGNED;
-- Result subtype: SIGNED(L'LENGTH-1 downto 0)
-- Result: Computes "L mod R" where L is a SIGNED vector and
-- R is an INTEGER.
-- If NO_OF_BITS(R) > L'LENGTH, result is truncated to L'LENGTH.
-- Id: A.38
function "mod" (L: INTEGER; R: SIGNED) return SIGNED;
-- Result subtype: SIGNED(R'LENGTH-1 downto 0)
-- Result: Computes "L mod R" where L is an INTEGER and
-- R is a SIGNED vector.
-- If NO_OF_BITS(L) > R'LENGTH, result is truncated to R'LENGTH.
--============================================================================
-- Comparison Operators
--============================================================================
-- Id: C.1
function ">" (L, R: UNSIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L > R" where L and R are UNSIGNED vectors possibly
-- of different lengths.
-- Id: C.2
function ">" (L, R: SIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L > R" where L and R are SIGNED vectors possibly
-- of different lengths.
-- Id: C.3
function ">" (L: NATURAL; R: UNSIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L > R" where L is a non-negative INTEGER and
-- R is an UNSIGNED vector.
-- Id: C.4
function ">" (L: INTEGER; R: SIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L > R" where L is a INTEGER and
-- R is a SIGNED vector.
-- Id: C.5
function ">" (L: UNSIGNED; R: NATURAL) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L > R" where L is an UNSIGNED vector and
-- R is a non-negative INTEGER.
-- Id: C.6
function ">" (L: SIGNED; R: INTEGER) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L > R" where L is a SIGNED vector and
-- R is a INTEGER.
--============================================================================
-- Id: C.7
function "<" (L, R: UNSIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L < R" where L and R are UNSIGNED vectors possibly
-- of different lengths.
-- Id: C.8
function "<" (L, R: SIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L < R" where L and R are SIGNED vectors possibly
-- of different lengths.
-- Id: C.9
function "<" (L: NATURAL; R: UNSIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L < R" where L is a non-negative INTEGER and
-- R is an UNSIGNED vector.
-- Id: C.10
function "<" (L: INTEGER; R: SIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L < R" where L is an INTEGER and
-- R is a SIGNED vector.
-- Id: C.11
function "<" (L: UNSIGNED; R: NATURAL) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L < R" where L is an UNSIGNED vector and
-- R is a non-negative INTEGER.
-- Id: C.12
function "<" (L: SIGNED; R: INTEGER) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L < R" where L is a SIGNED vector and
-- R is an INTEGER.
--============================================================================
-- Id: C.13
function "<=" (L, R: UNSIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L <= R" where L and R are UNSIGNED vectors possibly
-- of different lengths.
-- Id: C.14
function "<=" (L, R: SIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L <= R" where L and R are SIGNED vectors possibly
-- of different lengths.
-- Id: C.15
function "<=" (L: NATURAL; R: UNSIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L <= R" where L is a non-negative INTEGER and
-- R is an UNSIGNED vector.
-- Id: C.16
function "<=" (L: INTEGER; R: SIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L <= R" where L is an INTEGER and
-- R is a SIGNED vector.
-- Id: C.17
function "<=" (L: UNSIGNED; R: NATURAL) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L <= R" where L is an UNSIGNED vector and
-- R is a non-negative INTEGER.
-- Id: C.18
function "<=" (L: SIGNED; R: INTEGER) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L <= R" where L is a SIGNED vector and
-- R is an INTEGER.
--============================================================================
-- Id: C.19
function ">=" (L, R: UNSIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L >= R" where L and R are UNSIGNED vectors possibly
-- of different lengths.
-- Id: C.20
function ">=" (L, R: SIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L >= R" where L and R are SIGNED vectors possibly
-- of different lengths.
-- Id: C.21
function ">=" (L: NATURAL; R: UNSIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L >= R" where L is a non-negative INTEGER and
-- R is an UNSIGNED vector.
-- Id: C.22
function ">=" (L: INTEGER; R: SIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L >= R" where L is an INTEGER and
-- R is a SIGNED vector.
-- Id: C.23
function ">=" (L: UNSIGNED; R: NATURAL) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L >= R" where L is an UNSIGNED vector and
-- R is a non-negative INTEGER.
-- Id: C.24
function ">=" (L: SIGNED; R: INTEGER) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L >= R" where L is a SIGNED vector and
-- R is an INTEGER.
--============================================================================
-- Id: C.25
function "=" (L, R: UNSIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L = R" where L and R are UNSIGNED vectors possibly
-- of different lengths.
-- Id: C.26
function "=" (L, R: SIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L = R" where L and R are SIGNED vectors possibly
-- of different lengths.
-- Id: C.27
function "=" (L: NATURAL; R: UNSIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L = R" where L is a non-negative INTEGER and
-- R is an UNSIGNED vector.
-- Id: C.28
function "=" (L: INTEGER; R: SIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L = R" where L is an INTEGER and
-- R is a SIGNED vector.
-- Id: C.29
function "=" (L: UNSIGNED; R: NATURAL) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L = R" where L is an UNSIGNED vector and
-- R is a non-negative INTEGER.
-- Id: C.30
function "=" (L: SIGNED; R: INTEGER) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L = R" where L is a SIGNED vector and
-- R is an INTEGER.
--============================================================================
-- Id: C.31
function "/=" (L, R: UNSIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L /= R" where L and R are UNSIGNED vectors possibly
-- of different lengths.
-- Id: C.32
function "/=" (L, R: SIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L /= R" where L and R are SIGNED vectors possibly
-- of different lengths.
-- Id: C.33
function "/=" (L: NATURAL; R: UNSIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L /= R" where L is a non-negative INTEGER and
-- R is an UNSIGNED vector.
-- Id: C.34
function "/=" (L: INTEGER; R: SIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L /= R" where L is an INTEGER and
-- R is a SIGNED vector.
-- Id: C.35
function "/=" (L: UNSIGNED; R: NATURAL) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L /= R" where L is an UNSIGNED vector and
-- R is a non-negative INTEGER.
-- Id: C.36
function "/=" (L: SIGNED; R: INTEGER) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L /= R" where L is a SIGNED vector and
-- R is an INTEGER.
--============================================================================
-- Shift and Rotate Functions
--============================================================================
-- Id: S.1
function SHIFT_LEFT (ARG: UNSIGNED; COUNT: NATURAL) return UNSIGNED;
-- Result subtype: UNSIGNED(ARG'LENGTH-1 downto 0)
-- Result: Performs a shift-left on an UNSIGNED vector COUNT times.
-- The vacated positions are filled with '0'.
-- The COUNT leftmost elements are lost.
-- Id: S.2
function SHIFT_RIGHT (ARG: UNSIGNED; COUNT: NATURAL) return UNSIGNED;
-- Result subtype: UNSIGNED(ARG'LENGTH-1 downto 0)
-- Result: Performs a shift-right on an UNSIGNED vector COUNT times.
-- The vacated positions are filled with '0'.
-- The COUNT rightmost elements are lost.
-- Id: S.3
function SHIFT_LEFT (ARG: SIGNED; COUNT: NATURAL) return SIGNED;
-- Result subtype: SIGNED(ARG'LENGTH-1 downto 0)
-- Result: Performs a shift-left on a SIGNED vector COUNT times.
-- The vacated positions are filled with '0'.
-- The COUNT leftmost elements are lost.
-- Id: S.4
function SHIFT_RIGHT (ARG: SIGNED; COUNT: NATURAL) return SIGNED;
-- Result subtype: SIGNED(ARG'LENGTH-1 downto 0)
-- Result: Performs a shift-right on a SIGNED vector COUNT times.
-- The vacated positions are filled with the leftmost
-- element, ARG'LEFT. The COUNT rightmost elements are lost.
--============================================================================
-- Id: S.5
function ROTATE_LEFT (ARG: UNSIGNED; COUNT: NATURAL) return UNSIGNED;
-- Result subtype: UNSIGNED(ARG'LENGTH-1 downto 0)
-- Result: Performs a rotate-left of an UNSIGNED vector COUNT times.
-- Id: S.6
function ROTATE_RIGHT (ARG: UNSIGNED; COUNT: NATURAL) return UNSIGNED;
-- Result subtype: UNSIGNED(ARG'LENGTH-1 downto 0)
-- Result: Performs a rotate-right of an UNSIGNED vector COUNT times.
-- Id: S.7
function ROTATE_LEFT (ARG: SIGNED; COUNT: NATURAL) return SIGNED;
-- Result subtype: SIGNED(ARG'LENGTH-1 downto 0)
-- Result: Performs a logical rotate-left of a SIGNED
-- vector COUNT times.
-- Id: S.8
function ROTATE_RIGHT (ARG: SIGNED; COUNT: NATURAL) return SIGNED;
-- Result subtype: SIGNED(ARG'LENGTH-1 downto 0)
-- Result: Performs a logical rotate-right of a SIGNED
-- vector COUNT times.
--============================================================================
--============================================================================
------------------------------------------------------------------------------
-- Note : Function S.9 is not compatible with VHDL 1076-1987. Comment
-- out the function (declaration and body) for VHDL 1076-1987 compatibility.
------------------------------------------------------------------------------
-- Id: S.9
function "sll" (ARG: UNSIGNED; COUNT: INTEGER) return UNSIGNED; --!V87
-- Result subtype: UNSIGNED(ARG'LENGTH-1 downto 0)
-- Result: SHIFT_LEFT(ARG, COUNT)
------------------------------------------------------------------------------
-- Note : Function S.10 is not compatible with VHDL 1076-1987. Comment
-- out the function (declaration and body) for VHDL 1076-1987 compatibility.
------------------------------------------------------------------------------
-- Id: S.10
function "sll" (ARG: SIGNED; COUNT: INTEGER) return SIGNED; --!V87
-- Result subtype: SIGNED(ARG'LENGTH-1 downto 0)
-- Result: SHIFT_LEFT(ARG, COUNT)
------------------------------------------------------------------------------
-- Note : Function S.11 is not compatible with VHDL 1076-1987. Comment
-- out the function (declaration and body) for VHDL 1076-1987 compatibility.
------------------------------------------------------------------------------
-- Id: S.11
function "srl" (ARG: UNSIGNED; COUNT: INTEGER) return UNSIGNED; --!V87
-- Result subtype: UNSIGNED(ARG'LENGTH-1 downto 0)
-- Result: SHIFT_RIGHT(ARG, COUNT)
------------------------------------------------------------------------------
-- Note : Function S.12 is not compatible with VHDL 1076-1987. Comment
-- out the function (declaration and body) for VHDL 1076-1987 compatibility.
------------------------------------------------------------------------------
-- Id: S.12
function "srl" (ARG: SIGNED; COUNT: INTEGER) return SIGNED; --!V87
-- Result subtype: SIGNED(ARG'LENGTH-1 downto 0)
-- Result: SIGNED(SHIFT_RIGHT(UNSIGNED(ARG), COUNT))
------------------------------------------------------------------------------
-- Note : Function S.13 is not compatible with VHDL 1076-1987. Comment
-- out the function (declaration and body) for VHDL 1076-1987 compatibility.
------------------------------------------------------------------------------
-- Id: S.13
function "rol" (ARG: UNSIGNED; COUNT: INTEGER) return UNSIGNED; --!V87
-- Result subtype: UNSIGNED(ARG'LENGTH-1 downto 0)
-- Result: ROTATE_LEFT(ARG, COUNT)
------------------------------------------------------------------------------
-- Note : Function S.14 is not compatible with VHDL 1076-1987. Comment
-- out the function (declaration and body) for VHDL 1076-1987 compatibility.
------------------------------------------------------------------------------
-- Id: S.14
function "rol" (ARG: SIGNED; COUNT: INTEGER) return SIGNED; --!V87
-- Result subtype: SIGNED(ARG'LENGTH-1 downto 0)
-- Result: ROTATE_LEFT(ARG, COUNT)
------------------------------------------------------------------------------
-- Note : Function S.15 is not compatible with VHDL 1076-1987. Comment
-- out the function (declaration and body) for VHDL 1076-1987 compatibility.
------------------------------------------------------------------------------
-- Id: S.15
function "ror" (ARG: UNSIGNED; COUNT: INTEGER) return UNSIGNED; --!V87
-- Result subtype: UNSIGNED(ARG'LENGTH-1 downto 0)
-- Result: ROTATE_RIGHT(ARG, COUNT)
------------------------------------------------------------------------------
-- Note : Function S.16 is not compatible with VHDL 1076-1987. Comment
-- out the function (declaration and body) for VHDL 1076-1987 compatibility.
------------------------------------------------------------------------------
-- Id: S.16
function "ror" (ARG: SIGNED; COUNT: INTEGER) return SIGNED; --!V87
-- Result subtype: SIGNED(ARG'LENGTH-1 downto 0)
-- Result: ROTATE_RIGHT(ARG, COUNT)
--============================================================================
-- RESIZE Functions
--============================================================================
-- Id: R.1
function RESIZE (ARG: SIGNED; NEW_SIZE: NATURAL) return SIGNED;
-- Result subtype: SIGNED(NEW_SIZE-1 downto 0)
-- Result: Resizes the SIGNED vector ARG to the specified size.
-- To create a larger vector, the new [leftmost] bit positions
-- are filled with the sign bit (ARG'LEFT). When truncating,
-- the sign bit is retained along with the rightmost part.
-- Id: R.2
function RESIZE (ARG: UNSIGNED; NEW_SIZE: NATURAL) return UNSIGNED;
-- Result subtype: UNSIGNED(NEW_SIZE-1 downto 0)
-- Result: Resizes the SIGNED vector ARG to the specified size.
-- To create a larger vector, the new [leftmost] bit positions
-- are filled with '0'. When truncating, the leftmost bits
-- are dropped.
--============================================================================
-- Conversion Functions
--============================================================================
-- Id: D.1
function TO_INTEGER (ARG: UNSIGNED) return NATURAL;
-- Result subtype: NATURAL. Value cannot be negative since parameter is an
-- UNSIGNED vector.
-- Result: Converts the UNSIGNED vector to an INTEGER.
-- Id: D.2
function TO_INTEGER (ARG: SIGNED) return INTEGER;
-- Result subtype: INTEGER
-- Result: Converts a SIGNED vector to an INTEGER.
-- Id: D.3
function TO_UNSIGNED (ARG, SIZE: NATURAL) return UNSIGNED;
-- Result subtype: UNSIGNED(SIZE-1 downto 0)
-- Result: Converts a non-negative INTEGER to an UNSIGNED vector with
-- the specified SIZE.
-- Id: D.4
function TO_SIGNED (ARG: INTEGER; SIZE: NATURAL) return SIGNED;
-- Result subtype: SIGNED(SIZE-1 downto 0)
-- Result: Converts an INTEGER to a SIGNED vector of the specified SIZE.
--============================================================================
-- Logical Operators
--============================================================================
-- Id: L.1
function "not" (L: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(L'LENGTH-1 downto 0)
-- Result: Termwise inversion
-- Id: L.2
function "and" (L, R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(L'LENGTH-1 downto 0)
-- Result: Vector AND operation
-- Id: L.3
function "or" (L, R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(L'LENGTH-1 downto 0)
-- Result: Vector OR operation
-- Id: L.4
function "nand" (L, R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(L'LENGTH-1 downto 0)
-- Result: Vector NAND operation
-- Id: L.5
function "nor" (L, R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(L'LENGTH-1 downto 0)
-- Result: Vector NOR operation
-- Id: L.6
function "xor" (L, R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(L'LENGTH-1 downto 0)
-- Result: Vector XOR operation
-- ---------------------------------------------------------------------------
-- Note : Function L.7 is not compatible with VHDL 1076-1987. Comment
-- out the function (declaration and body) for VHDL 1076-1987 compatibility.
-- ---------------------------------------------------------------------------
-- Id: L.7
function "xnor" (L, R: UNSIGNED) return UNSIGNED; --!V87
-- Result subtype: UNSIGNED(L'LENGTH-1 downto 0)
-- Result: Vector XNOR operation
-- Id: L.8
function "not" (L: SIGNED) return SIGNED;
-- Result subtype: SIGNED(L'LENGTH-1 downto 0)
-- Result: Termwise inversion
-- Id: L.9
function "and" (L, R: SIGNED) return SIGNED;
-- Result subtype: SIGNED(L'LENGTH-1 downto 0)
-- Result: Vector AND operation
-- Id: L.10
function "or" (L, R: SIGNED) return SIGNED;
-- Result subtype: SIGNED(L'LENGTH-1 downto 0)
-- Result: Vector OR operation
-- Id: L.11
function "nand" (L, R: SIGNED) return SIGNED;
-- Result subtype: SIGNED(L'LENGTH-1 downto 0)
-- Result: Vector NAND operation
-- Id: L.12
function "nor" (L, R: SIGNED) return SIGNED;
-- Result subtype: SIGNED(L'LENGTH-1 downto 0)
-- Result: Vector NOR operation
-- Id: L.13
function "xor" (L, R: SIGNED) return SIGNED;
-- Result subtype: SIGNED(L'LENGTH-1 downto 0)
-- Result: Vector XOR operation
-- ---------------------------------------------------------------------------
-- Note : Function L.14 is not compatible with VHDL 1076-1987. Comment
-- out the function (declaration and body) for VHDL 1076-1987 compatibility.
-- ---------------------------------------------------------------------------
-- Id: L.14
function "xnor" (L, R: SIGNED) return SIGNED; --!V87
-- Result subtype: SIGNED(L'LENGTH-1 downto 0)
-- Result: Vector XNOR operation
--============================================================================
-- Match Functions
--============================================================================
-- Id: M.1
function STD_MATCH (L, R: STD_ULOGIC) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: terms compared per STD_LOGIC_1164 intent
-- Id: M.2
function STD_MATCH (L, R: UNSIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: terms compared per STD_LOGIC_1164 intent
-- Id: M.3
function STD_MATCH (L, R: SIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: terms compared per STD_LOGIC_1164 intent
-- Id: M.4
function STD_MATCH (L, R: STD_LOGIC_VECTOR) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: terms compared per STD_LOGIC_1164 intent
-- Id: M.5
function STD_MATCH (L, R: STD_ULOGIC_VECTOR) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: terms compared per STD_LOGIC_1164 intent
--============================================================================
-- Translation Functions
--============================================================================
-- Id: T.1
function TO_01 (S: UNSIGNED; XMAP: STD_LOGIC := '0') return UNSIGNED;
-- Result subtype: UNSIGNED(S'RANGE)
-- Result: Termwise, 'H' is translated to '1', and 'L' is translated
-- to '0'. If a value other than '0'|'1'|'H'|'L' is found,
-- the array is set to (others => XMAP), and a warning is
-- issued.
-- Id: T.2
function TO_01 (S: SIGNED; XMAP: STD_LOGIC := '0') return SIGNED;
-- Result subtype: SIGNED(S'RANGE)
-- Result: Termwise, 'H' is translated to '1', and 'L' is translated
-- to '0'. If a value other than '0'|'1'|'H'|'L' is found,
-- the array is set to (others => XMAP), and a warning is
-- issued.
end NUMERIC_STD;
|
-- --------------------------------------------------------------------
--
-- Copyright 1995 by IEEE. All rights reserved.
--
-- This source file is considered by the IEEE to be an essential part of the use
-- of the standard 1076.3 and as such may be distributed without change, except
-- as permitted by the standard. This source file may not be sold or distributed
-- for profit. This package may be modified to include additional data required
-- by tools, but must in no way change the external interfaces or simulation
-- behaviour of the description. It is permissible to add comments and/or
-- attributes to the package declarations, but not to change or delete any
-- original lines of the approved package declaration. The package body may be
-- changed only in accordance with the terms of clauses 7.1 and 7.2 of the
-- standard.
--
-- Title : Standard VHDL Synthesis Package (1076.3, NUMERIC_STD)
--
-- Library : This package shall be compiled into a library symbolically
-- : named IEEE.
--
-- Developers : IEEE DASC Synthesis Working Group, PAR 1076.3
--
-- Purpose : This package defines numeric types and arithmetic functions
-- : for use with synthesis tools. Two numeric types are defined:
-- : -- > UNSIGNED: represents UNSIGNED number in vector form
-- : -- > SIGNED: represents a SIGNED number in vector form
-- : The base element type is type STD_LOGIC.
-- : The leftmost bit is treated as the most significant bit.
-- : Signed vectors are represented in two's complement form.
-- : This package contains overloaded arithmetic operators on
-- : the SIGNED and UNSIGNED types. The package also contains
-- : useful type conversions functions.
-- :
-- : If any argument to a function is a null array, a null array is
-- : returned (exceptions, if any, are noted individually).
--
-- Limitation :
--
-- Note : No declarations or definitions shall be included in,
-- : or excluded from this package. The "package declaration"
-- : defines the types, subtypes and declarations of
-- : NUMERIC_STD. The NUMERIC_STD package body shall be
-- : considered the formal definition of the semantics of
-- : this package. Tool developers may choose to implement
-- : the package body in the most efficient manner available
-- : to them.
--
-- --------------------------------------------------------------------
-- modification history :
-- --------------------------------------------------------------------
-- Version: 2.4
-- Date : 12 April 1995
-- -----------------------------------------------------------------------------
library IEEE;
use IEEE.STD_LOGIC_1164.all;
package NUMERIC_STD is
constant CopyRightNotice: STRING
:= "Copyright 1995 IEEE. All rights reserved.";
--============================================================================
-- Numeric array type definitions
--============================================================================
type UNSIGNED is array (NATURAL range <>) of STD_LOGIC;
type SIGNED is array (NATURAL range <>) of STD_LOGIC;
--============================================================================
-- Arithmetic Operators:
--===========================================================================
-- Id: A.1
function "abs" (ARG: SIGNED) return SIGNED;
-- Result subtype: SIGNED(ARG'LENGTH-1 downto 0).
-- Result: Returns the absolute value of a SIGNED vector ARG.
-- Id: A.2
function "-" (ARG: SIGNED) return SIGNED;
-- Result subtype: SIGNED(ARG'LENGTH-1 downto 0).
-- Result: Returns the value of the unary minus operation on a
-- SIGNED vector ARG.
--============================================================================
-- Id: A.3
function "+" (L, R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(MAX(L'LENGTH, R'LENGTH)-1 downto 0).
-- Result: Adds two UNSIGNED vectors that may be of different lengths.
-- Id: A.4
function "+" (L, R: SIGNED) return SIGNED;
-- Result subtype: SIGNED(MAX(L'LENGTH, R'LENGTH)-1 downto 0).
-- Result: Adds two SIGNED vectors that may be of different lengths.
-- Id: A.5
function "+" (L: UNSIGNED; R: NATURAL) return UNSIGNED;
-- Result subtype: UNSIGNED(L'LENGTH-1 downto 0).
-- Result: Adds an UNSIGNED vector, L, with a non-negative INTEGER, R.
-- Id: A.6
function "+" (L: NATURAL; R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(R'LENGTH-1 downto 0).
-- Result: Adds a non-negative INTEGER, L, with an UNSIGNED vector, R.
-- Id: A.7
function "+" (L: INTEGER; R: SIGNED) return SIGNED;
-- Result subtype: SIGNED(R'LENGTH-1 downto 0).
-- Result: Adds an INTEGER, L(may be positive or negative), to a SIGNED
-- vector, R.
-- Id: A.8
function "+" (L: SIGNED; R: INTEGER) return SIGNED;
-- Result subtype: SIGNED(L'LENGTH-1 downto 0).
-- Result: Adds a SIGNED vector, L, to an INTEGER, R.
--============================================================================
-- Id: A.9
function "-" (L, R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(MAX(L'LENGTH, R'LENGTH)-1 downto 0).
-- Result: Subtracts two UNSIGNED vectors that may be of different lengths.
-- Id: A.10
function "-" (L, R: SIGNED) return SIGNED;
-- Result subtype: SIGNED(MAX(L'LENGTH, R'LENGTH)-1 downto 0).
-- Result: Subtracts a SIGNED vector, R, from another SIGNED vector, L,
-- that may possibly be of different lengths.
-- Id: A.11
function "-" (L: UNSIGNED;R: NATURAL) return UNSIGNED;
-- Result subtype: UNSIGNED(L'LENGTH-1 downto 0).
-- Result: Subtracts a non-negative INTEGER, R, from an UNSIGNED vector, L.
-- Id: A.12
function "-" (L: NATURAL; R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(R'LENGTH-1 downto 0).
-- Result: Subtracts an UNSIGNED vector, R, from a non-negative INTEGER, L.
-- Id: A.13
function "-" (L: SIGNED; R: INTEGER) return SIGNED;
-- Result subtype: SIGNED(L'LENGTH-1 downto 0).
-- Result: Subtracts an INTEGER, R, from a SIGNED vector, L.
-- Id: A.14
function "-" (L: INTEGER; R: SIGNED) return SIGNED;
-- Result subtype: SIGNED(R'LENGTH-1 downto 0).
-- Result: Subtracts a SIGNED vector, R, from an INTEGER, L.
--============================================================================
-- Id: A.15
function "*" (L, R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED((L'LENGTH+R'LENGTH-1) downto 0).
-- Result: Performs the multiplication operation on two UNSIGNED vectors
-- that may possibly be of different lengths.
-- Id: A.16
function "*" (L, R: SIGNED) return SIGNED;
-- Result subtype: SIGNED((L'LENGTH+R'LENGTH-1) downto 0)
-- Result: Multiplies two SIGNED vectors that may possibly be of
-- different lengths.
-- Id: A.17
function "*" (L: UNSIGNED; R: NATURAL) return UNSIGNED;
-- Result subtype: UNSIGNED((L'LENGTH+L'LENGTH-1) downto 0).
-- Result: Multiplies an UNSIGNED vector, L, with a non-negative
-- INTEGER, R. R is converted to an UNSIGNED vector of
-- SIZE L'LENGTH before multiplication.
-- Id: A.18
function "*" (L: NATURAL; R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED((R'LENGTH+R'LENGTH-1) downto 0).
-- Result: Multiplies an UNSIGNED vector, R, with a non-negative
-- INTEGER, L. L is converted to an UNSIGNED vector of
-- SIZE R'LENGTH before multiplication.
-- Id: A.19
function "*" (L: SIGNED; R: INTEGER) return SIGNED;
-- Result subtype: SIGNED((L'LENGTH+L'LENGTH-1) downto 0)
-- Result: Multiplies a SIGNED vector, L, with an INTEGER, R. R is
-- converted to a SIGNED vector of SIZE L'LENGTH before
-- multiplication.
-- Id: A.20
function "*" (L: INTEGER; R: SIGNED) return SIGNED;
-- Result subtype: SIGNED((R'LENGTH+R'LENGTH-1) downto 0)
-- Result: Multiplies a SIGNED vector, R, with an INTEGER, L. L is
-- converted to a SIGNED vector of SIZE R'LENGTH before
-- multiplication.
--============================================================================
--
-- NOTE: If second argument is zero for "/" operator, a severity level
-- of ERROR is issued.
-- Id: A.21
function "/" (L, R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(L'LENGTH-1 downto 0)
-- Result: Divides an UNSIGNED vector, L, by another UNSIGNED vector, R.
-- Id: A.22
function "/" (L, R: SIGNED) return SIGNED;
-- Result subtype: SIGNED(L'LENGTH-1 downto 0)
-- Result: Divides an SIGNED vector, L, by another SIGNED vector, R.
-- Id: A.23
function "/" (L: UNSIGNED; R: NATURAL) return UNSIGNED;
-- Result subtype: UNSIGNED(L'LENGTH-1 downto 0)
-- Result: Divides an UNSIGNED vector, L, by a non-negative INTEGER, R.
-- If NO_OF_BITS(R) > L'LENGTH, result is truncated to L'LENGTH.
-- Id: A.24
function "/" (L: NATURAL; R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(R'LENGTH-1 downto 0)
-- Result: Divides a non-negative INTEGER, L, by an UNSIGNED vector, R.
-- If NO_OF_BITS(L) > R'LENGTH, result is truncated to R'LENGTH.
-- Id: A.25
function "/" (L: SIGNED; R: INTEGER) return SIGNED;
-- Result subtype: SIGNED(L'LENGTH-1 downto 0)
-- Result: Divides a SIGNED vector, L, by an INTEGER, R.
-- If NO_OF_BITS(R) > L'LENGTH, result is truncated to L'LENGTH.
-- Id: A.26
function "/" (L: INTEGER; R: SIGNED) return SIGNED;
-- Result subtype: SIGNED(R'LENGTH-1 downto 0)
-- Result: Divides an INTEGER, L, by a SIGNED vector, R.
-- If NO_OF_BITS(L) > R'LENGTH, result is truncated to R'LENGTH.
--============================================================================
--
-- NOTE: If second argument is zero for "rem" operator, a severity level
-- of ERROR is issued.
-- Id: A.27
function "rem" (L, R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(R'LENGTH-1 downto 0)
-- Result: Computes "L rem R" where L and R are UNSIGNED vectors.
-- Id: A.28
function "rem" (L, R: SIGNED) return SIGNED;
-- Result subtype: SIGNED(R'LENGTH-1 downto 0)
-- Result: Computes "L rem R" where L and R are SIGNED vectors.
-- Id: A.29
function "rem" (L: UNSIGNED; R: NATURAL) return UNSIGNED;
-- Result subtype: UNSIGNED(L'LENGTH-1 downto 0)
-- Result: Computes "L rem R" where L is an UNSIGNED vector and R is a
-- non-negative INTEGER.
-- If NO_OF_BITS(R) > L'LENGTH, result is truncated to L'LENGTH.
-- Id: A.30
function "rem" (L: NATURAL; R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(R'LENGTH-1 downto 0)
-- Result: Computes "L rem R" where R is an UNSIGNED vector and L is a
-- non-negative INTEGER.
-- If NO_OF_BITS(L) > R'LENGTH, result is truncated to R'LENGTH.
-- Id: A.31
function "rem" (L: SIGNED; R: INTEGER) return SIGNED;
-- Result subtype: SIGNED(L'LENGTH-1 downto 0)
-- Result: Computes "L rem R" where L is SIGNED vector and R is an INTEGER.
-- If NO_OF_BITS(R) > L'LENGTH, result is truncated to L'LENGTH.
-- Id: A.32
function "rem" (L: INTEGER; R: SIGNED) return SIGNED;
-- Result subtype: SIGNED(R'LENGTH-1 downto 0)
-- Result: Computes "L rem R" where R is SIGNED vector and L is an INTEGER.
-- If NO_OF_BITS(L) > R'LENGTH, result is truncated to R'LENGTH.
--============================================================================
--
-- NOTE: If second argument is zero for "mod" operator, a severity level
-- of ERROR is issued.
-- Id: A.33
function "mod" (L, R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(R'LENGTH-1 downto 0)
-- Result: Computes "L mod R" where L and R are UNSIGNED vectors.
-- Id: A.34
function "mod" (L, R: SIGNED) return SIGNED;
-- Result subtype: SIGNED(R'LENGTH-1 downto 0)
-- Result: Computes "L mod R" where L and R are SIGNED vectors.
-- Id: A.35
function "mod" (L: UNSIGNED; R: NATURAL) return UNSIGNED;
-- Result subtype: UNSIGNED(L'LENGTH-1 downto 0)
-- Result: Computes "L mod R" where L is an UNSIGNED vector and R
-- is a non-negative INTEGER.
-- If NO_OF_BITS(R) > L'LENGTH, result is truncated to L'LENGTH.
-- Id: A.36
function "mod" (L: NATURAL; R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(R'LENGTH-1 downto 0)
-- Result: Computes "L mod R" where R is an UNSIGNED vector and L
-- is a non-negative INTEGER.
-- If NO_OF_BITS(L) > R'LENGTH, result is truncated to R'LENGTH.
-- Id: A.37
function "mod" (L: SIGNED; R: INTEGER) return SIGNED;
-- Result subtype: SIGNED(L'LENGTH-1 downto 0)
-- Result: Computes "L mod R" where L is a SIGNED vector and
-- R is an INTEGER.
-- If NO_OF_BITS(R) > L'LENGTH, result is truncated to L'LENGTH.
-- Id: A.38
function "mod" (L: INTEGER; R: SIGNED) return SIGNED;
-- Result subtype: SIGNED(R'LENGTH-1 downto 0)
-- Result: Computes "L mod R" where L is an INTEGER and
-- R is a SIGNED vector.
-- If NO_OF_BITS(L) > R'LENGTH, result is truncated to R'LENGTH.
--============================================================================
-- Comparison Operators
--============================================================================
-- Id: C.1
function ">" (L, R: UNSIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L > R" where L and R are UNSIGNED vectors possibly
-- of different lengths.
-- Id: C.2
function ">" (L, R: SIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L > R" where L and R are SIGNED vectors possibly
-- of different lengths.
-- Id: C.3
function ">" (L: NATURAL; R: UNSIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L > R" where L is a non-negative INTEGER and
-- R is an UNSIGNED vector.
-- Id: C.4
function ">" (L: INTEGER; R: SIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L > R" where L is a INTEGER and
-- R is a SIGNED vector.
-- Id: C.5
function ">" (L: UNSIGNED; R: NATURAL) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L > R" where L is an UNSIGNED vector and
-- R is a non-negative INTEGER.
-- Id: C.6
function ">" (L: SIGNED; R: INTEGER) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L > R" where L is a SIGNED vector and
-- R is a INTEGER.
--============================================================================
-- Id: C.7
function "<" (L, R: UNSIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L < R" where L and R are UNSIGNED vectors possibly
-- of different lengths.
-- Id: C.8
function "<" (L, R: SIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L < R" where L and R are SIGNED vectors possibly
-- of different lengths.
-- Id: C.9
function "<" (L: NATURAL; R: UNSIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L < R" where L is a non-negative INTEGER and
-- R is an UNSIGNED vector.
-- Id: C.10
function "<" (L: INTEGER; R: SIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L < R" where L is an INTEGER and
-- R is a SIGNED vector.
-- Id: C.11
function "<" (L: UNSIGNED; R: NATURAL) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L < R" where L is an UNSIGNED vector and
-- R is a non-negative INTEGER.
-- Id: C.12
function "<" (L: SIGNED; R: INTEGER) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L < R" where L is a SIGNED vector and
-- R is an INTEGER.
--============================================================================
-- Id: C.13
function "<=" (L, R: UNSIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L <= R" where L and R are UNSIGNED vectors possibly
-- of different lengths.
-- Id: C.14
function "<=" (L, R: SIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L <= R" where L and R are SIGNED vectors possibly
-- of different lengths.
-- Id: C.15
function "<=" (L: NATURAL; R: UNSIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L <= R" where L is a non-negative INTEGER and
-- R is an UNSIGNED vector.
-- Id: C.16
function "<=" (L: INTEGER; R: SIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L <= R" where L is an INTEGER and
-- R is a SIGNED vector.
-- Id: C.17
function "<=" (L: UNSIGNED; R: NATURAL) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L <= R" where L is an UNSIGNED vector and
-- R is a non-negative INTEGER.
-- Id: C.18
function "<=" (L: SIGNED; R: INTEGER) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L <= R" where L is a SIGNED vector and
-- R is an INTEGER.
--============================================================================
-- Id: C.19
function ">=" (L, R: UNSIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L >= R" where L and R are UNSIGNED vectors possibly
-- of different lengths.
-- Id: C.20
function ">=" (L, R: SIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L >= R" where L and R are SIGNED vectors possibly
-- of different lengths.
-- Id: C.21
function ">=" (L: NATURAL; R: UNSIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L >= R" where L is a non-negative INTEGER and
-- R is an UNSIGNED vector.
-- Id: C.22
function ">=" (L: INTEGER; R: SIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L >= R" where L is an INTEGER and
-- R is a SIGNED vector.
-- Id: C.23
function ">=" (L: UNSIGNED; R: NATURAL) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L >= R" where L is an UNSIGNED vector and
-- R is a non-negative INTEGER.
-- Id: C.24
function ">=" (L: SIGNED; R: INTEGER) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L >= R" where L is a SIGNED vector and
-- R is an INTEGER.
--============================================================================
-- Id: C.25
function "=" (L, R: UNSIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L = R" where L and R are UNSIGNED vectors possibly
-- of different lengths.
-- Id: C.26
function "=" (L, R: SIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L = R" where L and R are SIGNED vectors possibly
-- of different lengths.
-- Id: C.27
function "=" (L: NATURAL; R: UNSIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L = R" where L is a non-negative INTEGER and
-- R is an UNSIGNED vector.
-- Id: C.28
function "=" (L: INTEGER; R: SIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L = R" where L is an INTEGER and
-- R is a SIGNED vector.
-- Id: C.29
function "=" (L: UNSIGNED; R: NATURAL) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L = R" where L is an UNSIGNED vector and
-- R is a non-negative INTEGER.
-- Id: C.30
function "=" (L: SIGNED; R: INTEGER) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L = R" where L is a SIGNED vector and
-- R is an INTEGER.
--============================================================================
-- Id: C.31
function "/=" (L, R: UNSIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L /= R" where L and R are UNSIGNED vectors possibly
-- of different lengths.
-- Id: C.32
function "/=" (L, R: SIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L /= R" where L and R are SIGNED vectors possibly
-- of different lengths.
-- Id: C.33
function "/=" (L: NATURAL; R: UNSIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L /= R" where L is a non-negative INTEGER and
-- R is an UNSIGNED vector.
-- Id: C.34
function "/=" (L: INTEGER; R: SIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L /= R" where L is an INTEGER and
-- R is a SIGNED vector.
-- Id: C.35
function "/=" (L: UNSIGNED; R: NATURAL) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L /= R" where L is an UNSIGNED vector and
-- R is a non-negative INTEGER.
-- Id: C.36
function "/=" (L: SIGNED; R: INTEGER) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L /= R" where L is a SIGNED vector and
-- R is an INTEGER.
--============================================================================
-- Shift and Rotate Functions
--============================================================================
-- Id: S.1
function SHIFT_LEFT (ARG: UNSIGNED; COUNT: NATURAL) return UNSIGNED;
-- Result subtype: UNSIGNED(ARG'LENGTH-1 downto 0)
-- Result: Performs a shift-left on an UNSIGNED vector COUNT times.
-- The vacated positions are filled with '0'.
-- The COUNT leftmost elements are lost.
-- Id: S.2
function SHIFT_RIGHT (ARG: UNSIGNED; COUNT: NATURAL) return UNSIGNED;
-- Result subtype: UNSIGNED(ARG'LENGTH-1 downto 0)
-- Result: Performs a shift-right on an UNSIGNED vector COUNT times.
-- The vacated positions are filled with '0'.
-- The COUNT rightmost elements are lost.
-- Id: S.3
function SHIFT_LEFT (ARG: SIGNED; COUNT: NATURAL) return SIGNED;
-- Result subtype: SIGNED(ARG'LENGTH-1 downto 0)
-- Result: Performs a shift-left on a SIGNED vector COUNT times.
-- The vacated positions are filled with '0'.
-- The COUNT leftmost elements are lost.
-- Id: S.4
function SHIFT_RIGHT (ARG: SIGNED; COUNT: NATURAL) return SIGNED;
-- Result subtype: SIGNED(ARG'LENGTH-1 downto 0)
-- Result: Performs a shift-right on a SIGNED vector COUNT times.
-- The vacated positions are filled with the leftmost
-- element, ARG'LEFT. The COUNT rightmost elements are lost.
--============================================================================
-- Id: S.5
function ROTATE_LEFT (ARG: UNSIGNED; COUNT: NATURAL) return UNSIGNED;
-- Result subtype: UNSIGNED(ARG'LENGTH-1 downto 0)
-- Result: Performs a rotate-left of an UNSIGNED vector COUNT times.
-- Id: S.6
function ROTATE_RIGHT (ARG: UNSIGNED; COUNT: NATURAL) return UNSIGNED;
-- Result subtype: UNSIGNED(ARG'LENGTH-1 downto 0)
-- Result: Performs a rotate-right of an UNSIGNED vector COUNT times.
-- Id: S.7
function ROTATE_LEFT (ARG: SIGNED; COUNT: NATURAL) return SIGNED;
-- Result subtype: SIGNED(ARG'LENGTH-1 downto 0)
-- Result: Performs a logical rotate-left of a SIGNED
-- vector COUNT times.
-- Id: S.8
function ROTATE_RIGHT (ARG: SIGNED; COUNT: NATURAL) return SIGNED;
-- Result subtype: SIGNED(ARG'LENGTH-1 downto 0)
-- Result: Performs a logical rotate-right of a SIGNED
-- vector COUNT times.
--============================================================================
--============================================================================
------------------------------------------------------------------------------
-- Note : Function S.9 is not compatible with VHDL 1076-1987. Comment
-- out the function (declaration and body) for VHDL 1076-1987 compatibility.
------------------------------------------------------------------------------
-- Id: S.9
function "sll" (ARG: UNSIGNED; COUNT: INTEGER) return UNSIGNED; --!V87
-- Result subtype: UNSIGNED(ARG'LENGTH-1 downto 0)
-- Result: SHIFT_LEFT(ARG, COUNT)
------------------------------------------------------------------------------
-- Note : Function S.10 is not compatible with VHDL 1076-1987. Comment
-- out the function (declaration and body) for VHDL 1076-1987 compatibility.
------------------------------------------------------------------------------
-- Id: S.10
function "sll" (ARG: SIGNED; COUNT: INTEGER) return SIGNED; --!V87
-- Result subtype: SIGNED(ARG'LENGTH-1 downto 0)
-- Result: SHIFT_LEFT(ARG, COUNT)
------------------------------------------------------------------------------
-- Note : Function S.11 is not compatible with VHDL 1076-1987. Comment
-- out the function (declaration and body) for VHDL 1076-1987 compatibility.
------------------------------------------------------------------------------
-- Id: S.11
function "srl" (ARG: UNSIGNED; COUNT: INTEGER) return UNSIGNED; --!V87
-- Result subtype: UNSIGNED(ARG'LENGTH-1 downto 0)
-- Result: SHIFT_RIGHT(ARG, COUNT)
------------------------------------------------------------------------------
-- Note : Function S.12 is not compatible with VHDL 1076-1987. Comment
-- out the function (declaration and body) for VHDL 1076-1987 compatibility.
------------------------------------------------------------------------------
-- Id: S.12
function "srl" (ARG: SIGNED; COUNT: INTEGER) return SIGNED; --!V87
-- Result subtype: SIGNED(ARG'LENGTH-1 downto 0)
-- Result: SIGNED(SHIFT_RIGHT(UNSIGNED(ARG), COUNT))
------------------------------------------------------------------------------
-- Note : Function S.13 is not compatible with VHDL 1076-1987. Comment
-- out the function (declaration and body) for VHDL 1076-1987 compatibility.
------------------------------------------------------------------------------
-- Id: S.13
function "rol" (ARG: UNSIGNED; COUNT: INTEGER) return UNSIGNED; --!V87
-- Result subtype: UNSIGNED(ARG'LENGTH-1 downto 0)
-- Result: ROTATE_LEFT(ARG, COUNT)
------------------------------------------------------------------------------
-- Note : Function S.14 is not compatible with VHDL 1076-1987. Comment
-- out the function (declaration and body) for VHDL 1076-1987 compatibility.
------------------------------------------------------------------------------
-- Id: S.14
function "rol" (ARG: SIGNED; COUNT: INTEGER) return SIGNED; --!V87
-- Result subtype: SIGNED(ARG'LENGTH-1 downto 0)
-- Result: ROTATE_LEFT(ARG, COUNT)
------------------------------------------------------------------------------
-- Note : Function S.15 is not compatible with VHDL 1076-1987. Comment
-- out the function (declaration and body) for VHDL 1076-1987 compatibility.
------------------------------------------------------------------------------
-- Id: S.15
function "ror" (ARG: UNSIGNED; COUNT: INTEGER) return UNSIGNED; --!V87
-- Result subtype: UNSIGNED(ARG'LENGTH-1 downto 0)
-- Result: ROTATE_RIGHT(ARG, COUNT)
------------------------------------------------------------------------------
-- Note : Function S.16 is not compatible with VHDL 1076-1987. Comment
-- out the function (declaration and body) for VHDL 1076-1987 compatibility.
------------------------------------------------------------------------------
-- Id: S.16
function "ror" (ARG: SIGNED; COUNT: INTEGER) return SIGNED; --!V87
-- Result subtype: SIGNED(ARG'LENGTH-1 downto 0)
-- Result: ROTATE_RIGHT(ARG, COUNT)
--============================================================================
-- RESIZE Functions
--============================================================================
-- Id: R.1
function RESIZE (ARG: SIGNED; NEW_SIZE: NATURAL) return SIGNED;
-- Result subtype: SIGNED(NEW_SIZE-1 downto 0)
-- Result: Resizes the SIGNED vector ARG to the specified size.
-- To create a larger vector, the new [leftmost] bit positions
-- are filled with the sign bit (ARG'LEFT). When truncating,
-- the sign bit is retained along with the rightmost part.
-- Id: R.2
function RESIZE (ARG: UNSIGNED; NEW_SIZE: NATURAL) return UNSIGNED;
-- Result subtype: UNSIGNED(NEW_SIZE-1 downto 0)
-- Result: Resizes the SIGNED vector ARG to the specified size.
-- To create a larger vector, the new [leftmost] bit positions
-- are filled with '0'. When truncating, the leftmost bits
-- are dropped.
--============================================================================
-- Conversion Functions
--============================================================================
-- Id: D.1
function TO_INTEGER (ARG: UNSIGNED) return NATURAL;
-- Result subtype: NATURAL. Value cannot be negative since parameter is an
-- UNSIGNED vector.
-- Result: Converts the UNSIGNED vector to an INTEGER.
-- Id: D.2
function TO_INTEGER (ARG: SIGNED) return INTEGER;
-- Result subtype: INTEGER
-- Result: Converts a SIGNED vector to an INTEGER.
-- Id: D.3
function TO_UNSIGNED (ARG, SIZE: NATURAL) return UNSIGNED;
-- Result subtype: UNSIGNED(SIZE-1 downto 0)
-- Result: Converts a non-negative INTEGER to an UNSIGNED vector with
-- the specified SIZE.
-- Id: D.4
function TO_SIGNED (ARG: INTEGER; SIZE: NATURAL) return SIGNED;
-- Result subtype: SIGNED(SIZE-1 downto 0)
-- Result: Converts an INTEGER to a SIGNED vector of the specified SIZE.
--============================================================================
-- Logical Operators
--============================================================================
-- Id: L.1
function "not" (L: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(L'LENGTH-1 downto 0)
-- Result: Termwise inversion
-- Id: L.2
function "and" (L, R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(L'LENGTH-1 downto 0)
-- Result: Vector AND operation
-- Id: L.3
function "or" (L, R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(L'LENGTH-1 downto 0)
-- Result: Vector OR operation
-- Id: L.4
function "nand" (L, R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(L'LENGTH-1 downto 0)
-- Result: Vector NAND operation
-- Id: L.5
function "nor" (L, R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(L'LENGTH-1 downto 0)
-- Result: Vector NOR operation
-- Id: L.6
function "xor" (L, R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(L'LENGTH-1 downto 0)
-- Result: Vector XOR operation
-- ---------------------------------------------------------------------------
-- Note : Function L.7 is not compatible with VHDL 1076-1987. Comment
-- out the function (declaration and body) for VHDL 1076-1987 compatibility.
-- ---------------------------------------------------------------------------
-- Id: L.7
function "xnor" (L, R: UNSIGNED) return UNSIGNED; --!V87
-- Result subtype: UNSIGNED(L'LENGTH-1 downto 0)
-- Result: Vector XNOR operation
-- Id: L.8
function "not" (L: SIGNED) return SIGNED;
-- Result subtype: SIGNED(L'LENGTH-1 downto 0)
-- Result: Termwise inversion
-- Id: L.9
function "and" (L, R: SIGNED) return SIGNED;
-- Result subtype: SIGNED(L'LENGTH-1 downto 0)
-- Result: Vector AND operation
-- Id: L.10
function "or" (L, R: SIGNED) return SIGNED;
-- Result subtype: SIGNED(L'LENGTH-1 downto 0)
-- Result: Vector OR operation
-- Id: L.11
function "nand" (L, R: SIGNED) return SIGNED;
-- Result subtype: SIGNED(L'LENGTH-1 downto 0)
-- Result: Vector NAND operation
-- Id: L.12
function "nor" (L, R: SIGNED) return SIGNED;
-- Result subtype: SIGNED(L'LENGTH-1 downto 0)
-- Result: Vector NOR operation
-- Id: L.13
function "xor" (L, R: SIGNED) return SIGNED;
-- Result subtype: SIGNED(L'LENGTH-1 downto 0)
-- Result: Vector XOR operation
-- ---------------------------------------------------------------------------
-- Note : Function L.14 is not compatible with VHDL 1076-1987. Comment
-- out the function (declaration and body) for VHDL 1076-1987 compatibility.
-- ---------------------------------------------------------------------------
-- Id: L.14
function "xnor" (L, R: SIGNED) return SIGNED; --!V87
-- Result subtype: SIGNED(L'LENGTH-1 downto 0)
-- Result: Vector XNOR operation
--============================================================================
-- Match Functions
--============================================================================
-- Id: M.1
function STD_MATCH (L, R: STD_ULOGIC) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: terms compared per STD_LOGIC_1164 intent
-- Id: M.2
function STD_MATCH (L, R: UNSIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: terms compared per STD_LOGIC_1164 intent
-- Id: M.3
function STD_MATCH (L, R: SIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: terms compared per STD_LOGIC_1164 intent
-- Id: M.4
function STD_MATCH (L, R: STD_LOGIC_VECTOR) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: terms compared per STD_LOGIC_1164 intent
-- Id: M.5
function STD_MATCH (L, R: STD_ULOGIC_VECTOR) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: terms compared per STD_LOGIC_1164 intent
--============================================================================
-- Translation Functions
--============================================================================
-- Id: T.1
function TO_01 (S: UNSIGNED; XMAP: STD_LOGIC := '0') return UNSIGNED;
-- Result subtype: UNSIGNED(S'RANGE)
-- Result: Termwise, 'H' is translated to '1', and 'L' is translated
-- to '0'. If a value other than '0'|'1'|'H'|'L' is found,
-- the array is set to (others => XMAP), and a warning is
-- issued.
-- Id: T.2
function TO_01 (S: SIGNED; XMAP: STD_LOGIC := '0') return SIGNED;
-- Result subtype: SIGNED(S'RANGE)
-- Result: Termwise, 'H' is translated to '1', and 'L' is translated
-- to '0'. If a value other than '0'|'1'|'H'|'L' is found,
-- the array is set to (others => XMAP), and a warning is
-- issued.
end NUMERIC_STD;
|
-- --------------------------------------------------------------------
--
-- Copyright 1995 by IEEE. All rights reserved.
--
-- This source file is considered by the IEEE to be an essential part of the use
-- of the standard 1076.3 and as such may be distributed without change, except
-- as permitted by the standard. This source file may not be sold or distributed
-- for profit. This package may be modified to include additional data required
-- by tools, but must in no way change the external interfaces or simulation
-- behaviour of the description. It is permissible to add comments and/or
-- attributes to the package declarations, but not to change or delete any
-- original lines of the approved package declaration. The package body may be
-- changed only in accordance with the terms of clauses 7.1 and 7.2 of the
-- standard.
--
-- Title : Standard VHDL Synthesis Package (1076.3, NUMERIC_STD)
--
-- Library : This package shall be compiled into a library symbolically
-- : named IEEE.
--
-- Developers : IEEE DASC Synthesis Working Group, PAR 1076.3
--
-- Purpose : This package defines numeric types and arithmetic functions
-- : for use with synthesis tools. Two numeric types are defined:
-- : -- > UNSIGNED: represents UNSIGNED number in vector form
-- : -- > SIGNED: represents a SIGNED number in vector form
-- : The base element type is type STD_LOGIC.
-- : The leftmost bit is treated as the most significant bit.
-- : Signed vectors are represented in two's complement form.
-- : This package contains overloaded arithmetic operators on
-- : the SIGNED and UNSIGNED types. The package also contains
-- : useful type conversions functions.
-- :
-- : If any argument to a function is a null array, a null array is
-- : returned (exceptions, if any, are noted individually).
--
-- Limitation :
--
-- Note : No declarations or definitions shall be included in,
-- : or excluded from this package. The "package declaration"
-- : defines the types, subtypes and declarations of
-- : NUMERIC_STD. The NUMERIC_STD package body shall be
-- : considered the formal definition of the semantics of
-- : this package. Tool developers may choose to implement
-- : the package body in the most efficient manner available
-- : to them.
--
-- --------------------------------------------------------------------
-- modification history :
-- --------------------------------------------------------------------
-- Version: 2.4
-- Date : 12 April 1995
-- -----------------------------------------------------------------------------
library IEEE;
use IEEE.STD_LOGIC_1164.all;
package NUMERIC_STD is
constant CopyRightNotice: STRING
:= "Copyright 1995 IEEE. All rights reserved.";
--============================================================================
-- Numeric array type definitions
--============================================================================
type UNSIGNED is array (NATURAL range <>) of STD_LOGIC;
type SIGNED is array (NATURAL range <>) of STD_LOGIC;
--============================================================================
-- Arithmetic Operators:
--===========================================================================
-- Id: A.1
function "abs" (ARG: SIGNED) return SIGNED;
-- Result subtype: SIGNED(ARG'LENGTH-1 downto 0).
-- Result: Returns the absolute value of a SIGNED vector ARG.
-- Id: A.2
function "-" (ARG: SIGNED) return SIGNED;
-- Result subtype: SIGNED(ARG'LENGTH-1 downto 0).
-- Result: Returns the value of the unary minus operation on a
-- SIGNED vector ARG.
--============================================================================
-- Id: A.3
function "+" (L, R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(MAX(L'LENGTH, R'LENGTH)-1 downto 0).
-- Result: Adds two UNSIGNED vectors that may be of different lengths.
-- Id: A.4
function "+" (L, R: SIGNED) return SIGNED;
-- Result subtype: SIGNED(MAX(L'LENGTH, R'LENGTH)-1 downto 0).
-- Result: Adds two SIGNED vectors that may be of different lengths.
-- Id: A.5
function "+" (L: UNSIGNED; R: NATURAL) return UNSIGNED;
-- Result subtype: UNSIGNED(L'LENGTH-1 downto 0).
-- Result: Adds an UNSIGNED vector, L, with a non-negative INTEGER, R.
-- Id: A.6
function "+" (L: NATURAL; R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(R'LENGTH-1 downto 0).
-- Result: Adds a non-negative INTEGER, L, with an UNSIGNED vector, R.
-- Id: A.7
function "+" (L: INTEGER; R: SIGNED) return SIGNED;
-- Result subtype: SIGNED(R'LENGTH-1 downto 0).
-- Result: Adds an INTEGER, L(may be positive or negative), to a SIGNED
-- vector, R.
-- Id: A.8
function "+" (L: SIGNED; R: INTEGER) return SIGNED;
-- Result subtype: SIGNED(L'LENGTH-1 downto 0).
-- Result: Adds a SIGNED vector, L, to an INTEGER, R.
--============================================================================
-- Id: A.9
function "-" (L, R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(MAX(L'LENGTH, R'LENGTH)-1 downto 0).
-- Result: Subtracts two UNSIGNED vectors that may be of different lengths.
-- Id: A.10
function "-" (L, R: SIGNED) return SIGNED;
-- Result subtype: SIGNED(MAX(L'LENGTH, R'LENGTH)-1 downto 0).
-- Result: Subtracts a SIGNED vector, R, from another SIGNED vector, L,
-- that may possibly be of different lengths.
-- Id: A.11
function "-" (L: UNSIGNED;R: NATURAL) return UNSIGNED;
-- Result subtype: UNSIGNED(L'LENGTH-1 downto 0).
-- Result: Subtracts a non-negative INTEGER, R, from an UNSIGNED vector, L.
-- Id: A.12
function "-" (L: NATURAL; R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(R'LENGTH-1 downto 0).
-- Result: Subtracts an UNSIGNED vector, R, from a non-negative INTEGER, L.
-- Id: A.13
function "-" (L: SIGNED; R: INTEGER) return SIGNED;
-- Result subtype: SIGNED(L'LENGTH-1 downto 0).
-- Result: Subtracts an INTEGER, R, from a SIGNED vector, L.
-- Id: A.14
function "-" (L: INTEGER; R: SIGNED) return SIGNED;
-- Result subtype: SIGNED(R'LENGTH-1 downto 0).
-- Result: Subtracts a SIGNED vector, R, from an INTEGER, L.
--============================================================================
-- Id: A.15
function "*" (L, R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED((L'LENGTH+R'LENGTH-1) downto 0).
-- Result: Performs the multiplication operation on two UNSIGNED vectors
-- that may possibly be of different lengths.
-- Id: A.16
function "*" (L, R: SIGNED) return SIGNED;
-- Result subtype: SIGNED((L'LENGTH+R'LENGTH-1) downto 0)
-- Result: Multiplies two SIGNED vectors that may possibly be of
-- different lengths.
-- Id: A.17
function "*" (L: UNSIGNED; R: NATURAL) return UNSIGNED;
-- Result subtype: UNSIGNED((L'LENGTH+L'LENGTH-1) downto 0).
-- Result: Multiplies an UNSIGNED vector, L, with a non-negative
-- INTEGER, R. R is converted to an UNSIGNED vector of
-- SIZE L'LENGTH before multiplication.
-- Id: A.18
function "*" (L: NATURAL; R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED((R'LENGTH+R'LENGTH-1) downto 0).
-- Result: Multiplies an UNSIGNED vector, R, with a non-negative
-- INTEGER, L. L is converted to an UNSIGNED vector of
-- SIZE R'LENGTH before multiplication.
-- Id: A.19
function "*" (L: SIGNED; R: INTEGER) return SIGNED;
-- Result subtype: SIGNED((L'LENGTH+L'LENGTH-1) downto 0)
-- Result: Multiplies a SIGNED vector, L, with an INTEGER, R. R is
-- converted to a SIGNED vector of SIZE L'LENGTH before
-- multiplication.
-- Id: A.20
function "*" (L: INTEGER; R: SIGNED) return SIGNED;
-- Result subtype: SIGNED((R'LENGTH+R'LENGTH-1) downto 0)
-- Result: Multiplies a SIGNED vector, R, with an INTEGER, L. L is
-- converted to a SIGNED vector of SIZE R'LENGTH before
-- multiplication.
--============================================================================
--
-- NOTE: If second argument is zero for "/" operator, a severity level
-- of ERROR is issued.
-- Id: A.21
function "/" (L, R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(L'LENGTH-1 downto 0)
-- Result: Divides an UNSIGNED vector, L, by another UNSIGNED vector, R.
-- Id: A.22
function "/" (L, R: SIGNED) return SIGNED;
-- Result subtype: SIGNED(L'LENGTH-1 downto 0)
-- Result: Divides an SIGNED vector, L, by another SIGNED vector, R.
-- Id: A.23
function "/" (L: UNSIGNED; R: NATURAL) return UNSIGNED;
-- Result subtype: UNSIGNED(L'LENGTH-1 downto 0)
-- Result: Divides an UNSIGNED vector, L, by a non-negative INTEGER, R.
-- If NO_OF_BITS(R) > L'LENGTH, result is truncated to L'LENGTH.
-- Id: A.24
function "/" (L: NATURAL; R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(R'LENGTH-1 downto 0)
-- Result: Divides a non-negative INTEGER, L, by an UNSIGNED vector, R.
-- If NO_OF_BITS(L) > R'LENGTH, result is truncated to R'LENGTH.
-- Id: A.25
function "/" (L: SIGNED; R: INTEGER) return SIGNED;
-- Result subtype: SIGNED(L'LENGTH-1 downto 0)
-- Result: Divides a SIGNED vector, L, by an INTEGER, R.
-- If NO_OF_BITS(R) > L'LENGTH, result is truncated to L'LENGTH.
-- Id: A.26
function "/" (L: INTEGER; R: SIGNED) return SIGNED;
-- Result subtype: SIGNED(R'LENGTH-1 downto 0)
-- Result: Divides an INTEGER, L, by a SIGNED vector, R.
-- If NO_OF_BITS(L) > R'LENGTH, result is truncated to R'LENGTH.
--============================================================================
--
-- NOTE: If second argument is zero for "rem" operator, a severity level
-- of ERROR is issued.
-- Id: A.27
function "rem" (L, R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(R'LENGTH-1 downto 0)
-- Result: Computes "L rem R" where L and R are UNSIGNED vectors.
-- Id: A.28
function "rem" (L, R: SIGNED) return SIGNED;
-- Result subtype: SIGNED(R'LENGTH-1 downto 0)
-- Result: Computes "L rem R" where L and R are SIGNED vectors.
-- Id: A.29
function "rem" (L: UNSIGNED; R: NATURAL) return UNSIGNED;
-- Result subtype: UNSIGNED(L'LENGTH-1 downto 0)
-- Result: Computes "L rem R" where L is an UNSIGNED vector and R is a
-- non-negative INTEGER.
-- If NO_OF_BITS(R) > L'LENGTH, result is truncated to L'LENGTH.
-- Id: A.30
function "rem" (L: NATURAL; R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(R'LENGTH-1 downto 0)
-- Result: Computes "L rem R" where R is an UNSIGNED vector and L is a
-- non-negative INTEGER.
-- If NO_OF_BITS(L) > R'LENGTH, result is truncated to R'LENGTH.
-- Id: A.31
function "rem" (L: SIGNED; R: INTEGER) return SIGNED;
-- Result subtype: SIGNED(L'LENGTH-1 downto 0)
-- Result: Computes "L rem R" where L is SIGNED vector and R is an INTEGER.
-- If NO_OF_BITS(R) > L'LENGTH, result is truncated to L'LENGTH.
-- Id: A.32
function "rem" (L: INTEGER; R: SIGNED) return SIGNED;
-- Result subtype: SIGNED(R'LENGTH-1 downto 0)
-- Result: Computes "L rem R" where R is SIGNED vector and L is an INTEGER.
-- If NO_OF_BITS(L) > R'LENGTH, result is truncated to R'LENGTH.
--============================================================================
--
-- NOTE: If second argument is zero for "mod" operator, a severity level
-- of ERROR is issued.
-- Id: A.33
function "mod" (L, R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(R'LENGTH-1 downto 0)
-- Result: Computes "L mod R" where L and R are UNSIGNED vectors.
-- Id: A.34
function "mod" (L, R: SIGNED) return SIGNED;
-- Result subtype: SIGNED(R'LENGTH-1 downto 0)
-- Result: Computes "L mod R" where L and R are SIGNED vectors.
-- Id: A.35
function "mod" (L: UNSIGNED; R: NATURAL) return UNSIGNED;
-- Result subtype: UNSIGNED(L'LENGTH-1 downto 0)
-- Result: Computes "L mod R" where L is an UNSIGNED vector and R
-- is a non-negative INTEGER.
-- If NO_OF_BITS(R) > L'LENGTH, result is truncated to L'LENGTH.
-- Id: A.36
function "mod" (L: NATURAL; R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(R'LENGTH-1 downto 0)
-- Result: Computes "L mod R" where R is an UNSIGNED vector and L
-- is a non-negative INTEGER.
-- If NO_OF_BITS(L) > R'LENGTH, result is truncated to R'LENGTH.
-- Id: A.37
function "mod" (L: SIGNED; R: INTEGER) return SIGNED;
-- Result subtype: SIGNED(L'LENGTH-1 downto 0)
-- Result: Computes "L mod R" where L is a SIGNED vector and
-- R is an INTEGER.
-- If NO_OF_BITS(R) > L'LENGTH, result is truncated to L'LENGTH.
-- Id: A.38
function "mod" (L: INTEGER; R: SIGNED) return SIGNED;
-- Result subtype: SIGNED(R'LENGTH-1 downto 0)
-- Result: Computes "L mod R" where L is an INTEGER and
-- R is a SIGNED vector.
-- If NO_OF_BITS(L) > R'LENGTH, result is truncated to R'LENGTH.
--============================================================================
-- Comparison Operators
--============================================================================
-- Id: C.1
function ">" (L, R: UNSIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L > R" where L and R are UNSIGNED vectors possibly
-- of different lengths.
-- Id: C.2
function ">" (L, R: SIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L > R" where L and R are SIGNED vectors possibly
-- of different lengths.
-- Id: C.3
function ">" (L: NATURAL; R: UNSIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L > R" where L is a non-negative INTEGER and
-- R is an UNSIGNED vector.
-- Id: C.4
function ">" (L: INTEGER; R: SIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L > R" where L is a INTEGER and
-- R is a SIGNED vector.
-- Id: C.5
function ">" (L: UNSIGNED; R: NATURAL) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L > R" where L is an UNSIGNED vector and
-- R is a non-negative INTEGER.
-- Id: C.6
function ">" (L: SIGNED; R: INTEGER) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L > R" where L is a SIGNED vector and
-- R is a INTEGER.
--============================================================================
-- Id: C.7
function "<" (L, R: UNSIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L < R" where L and R are UNSIGNED vectors possibly
-- of different lengths.
-- Id: C.8
function "<" (L, R: SIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L < R" where L and R are SIGNED vectors possibly
-- of different lengths.
-- Id: C.9
function "<" (L: NATURAL; R: UNSIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L < R" where L is a non-negative INTEGER and
-- R is an UNSIGNED vector.
-- Id: C.10
function "<" (L: INTEGER; R: SIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L < R" where L is an INTEGER and
-- R is a SIGNED vector.
-- Id: C.11
function "<" (L: UNSIGNED; R: NATURAL) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L < R" where L is an UNSIGNED vector and
-- R is a non-negative INTEGER.
-- Id: C.12
function "<" (L: SIGNED; R: INTEGER) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L < R" where L is a SIGNED vector and
-- R is an INTEGER.
--============================================================================
-- Id: C.13
function "<=" (L, R: UNSIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L <= R" where L and R are UNSIGNED vectors possibly
-- of different lengths.
-- Id: C.14
function "<=" (L, R: SIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L <= R" where L and R are SIGNED vectors possibly
-- of different lengths.
-- Id: C.15
function "<=" (L: NATURAL; R: UNSIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L <= R" where L is a non-negative INTEGER and
-- R is an UNSIGNED vector.
-- Id: C.16
function "<=" (L: INTEGER; R: SIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L <= R" where L is an INTEGER and
-- R is a SIGNED vector.
-- Id: C.17
function "<=" (L: UNSIGNED; R: NATURAL) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L <= R" where L is an UNSIGNED vector and
-- R is a non-negative INTEGER.
-- Id: C.18
function "<=" (L: SIGNED; R: INTEGER) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L <= R" where L is a SIGNED vector and
-- R is an INTEGER.
--============================================================================
-- Id: C.19
function ">=" (L, R: UNSIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L >= R" where L and R are UNSIGNED vectors possibly
-- of different lengths.
-- Id: C.20
function ">=" (L, R: SIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L >= R" where L and R are SIGNED vectors possibly
-- of different lengths.
-- Id: C.21
function ">=" (L: NATURAL; R: UNSIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L >= R" where L is a non-negative INTEGER and
-- R is an UNSIGNED vector.
-- Id: C.22
function ">=" (L: INTEGER; R: SIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L >= R" where L is an INTEGER and
-- R is a SIGNED vector.
-- Id: C.23
function ">=" (L: UNSIGNED; R: NATURAL) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L >= R" where L is an UNSIGNED vector and
-- R is a non-negative INTEGER.
-- Id: C.24
function ">=" (L: SIGNED; R: INTEGER) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L >= R" where L is a SIGNED vector and
-- R is an INTEGER.
--============================================================================
-- Id: C.25
function "=" (L, R: UNSIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L = R" where L and R are UNSIGNED vectors possibly
-- of different lengths.
-- Id: C.26
function "=" (L, R: SIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L = R" where L and R are SIGNED vectors possibly
-- of different lengths.
-- Id: C.27
function "=" (L: NATURAL; R: UNSIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L = R" where L is a non-negative INTEGER and
-- R is an UNSIGNED vector.
-- Id: C.28
function "=" (L: INTEGER; R: SIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L = R" where L is an INTEGER and
-- R is a SIGNED vector.
-- Id: C.29
function "=" (L: UNSIGNED; R: NATURAL) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L = R" where L is an UNSIGNED vector and
-- R is a non-negative INTEGER.
-- Id: C.30
function "=" (L: SIGNED; R: INTEGER) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L = R" where L is a SIGNED vector and
-- R is an INTEGER.
--============================================================================
-- Id: C.31
function "/=" (L, R: UNSIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L /= R" where L and R are UNSIGNED vectors possibly
-- of different lengths.
-- Id: C.32
function "/=" (L, R: SIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L /= R" where L and R are SIGNED vectors possibly
-- of different lengths.
-- Id: C.33
function "/=" (L: NATURAL; R: UNSIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L /= R" where L is a non-negative INTEGER and
-- R is an UNSIGNED vector.
-- Id: C.34
function "/=" (L: INTEGER; R: SIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L /= R" where L is an INTEGER and
-- R is a SIGNED vector.
-- Id: C.35
function "/=" (L: UNSIGNED; R: NATURAL) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L /= R" where L is an UNSIGNED vector and
-- R is a non-negative INTEGER.
-- Id: C.36
function "/=" (L: SIGNED; R: INTEGER) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L /= R" where L is a SIGNED vector and
-- R is an INTEGER.
--============================================================================
-- Shift and Rotate Functions
--============================================================================
-- Id: S.1
function SHIFT_LEFT (ARG: UNSIGNED; COUNT: NATURAL) return UNSIGNED;
-- Result subtype: UNSIGNED(ARG'LENGTH-1 downto 0)
-- Result: Performs a shift-left on an UNSIGNED vector COUNT times.
-- The vacated positions are filled with '0'.
-- The COUNT leftmost elements are lost.
-- Id: S.2
function SHIFT_RIGHT (ARG: UNSIGNED; COUNT: NATURAL) return UNSIGNED;
-- Result subtype: UNSIGNED(ARG'LENGTH-1 downto 0)
-- Result: Performs a shift-right on an UNSIGNED vector COUNT times.
-- The vacated positions are filled with '0'.
-- The COUNT rightmost elements are lost.
-- Id: S.3
function SHIFT_LEFT (ARG: SIGNED; COUNT: NATURAL) return SIGNED;
-- Result subtype: SIGNED(ARG'LENGTH-1 downto 0)
-- Result: Performs a shift-left on a SIGNED vector COUNT times.
-- The vacated positions are filled with '0'.
-- The COUNT leftmost elements are lost.
-- Id: S.4
function SHIFT_RIGHT (ARG: SIGNED; COUNT: NATURAL) return SIGNED;
-- Result subtype: SIGNED(ARG'LENGTH-1 downto 0)
-- Result: Performs a shift-right on a SIGNED vector COUNT times.
-- The vacated positions are filled with the leftmost
-- element, ARG'LEFT. The COUNT rightmost elements are lost.
--============================================================================
-- Id: S.5
function ROTATE_LEFT (ARG: UNSIGNED; COUNT: NATURAL) return UNSIGNED;
-- Result subtype: UNSIGNED(ARG'LENGTH-1 downto 0)
-- Result: Performs a rotate-left of an UNSIGNED vector COUNT times.
-- Id: S.6
function ROTATE_RIGHT (ARG: UNSIGNED; COUNT: NATURAL) return UNSIGNED;
-- Result subtype: UNSIGNED(ARG'LENGTH-1 downto 0)
-- Result: Performs a rotate-right of an UNSIGNED vector COUNT times.
-- Id: S.7
function ROTATE_LEFT (ARG: SIGNED; COUNT: NATURAL) return SIGNED;
-- Result subtype: SIGNED(ARG'LENGTH-1 downto 0)
-- Result: Performs a logical rotate-left of a SIGNED
-- vector COUNT times.
-- Id: S.8
function ROTATE_RIGHT (ARG: SIGNED; COUNT: NATURAL) return SIGNED;
-- Result subtype: SIGNED(ARG'LENGTH-1 downto 0)
-- Result: Performs a logical rotate-right of a SIGNED
-- vector COUNT times.
--============================================================================
--============================================================================
------------------------------------------------------------------------------
-- Note : Function S.9 is not compatible with VHDL 1076-1987. Comment
-- out the function (declaration and body) for VHDL 1076-1987 compatibility.
------------------------------------------------------------------------------
-- Id: S.9
function "sll" (ARG: UNSIGNED; COUNT: INTEGER) return UNSIGNED; --!V87
-- Result subtype: UNSIGNED(ARG'LENGTH-1 downto 0)
-- Result: SHIFT_LEFT(ARG, COUNT)
------------------------------------------------------------------------------
-- Note : Function S.10 is not compatible with VHDL 1076-1987. Comment
-- out the function (declaration and body) for VHDL 1076-1987 compatibility.
------------------------------------------------------------------------------
-- Id: S.10
function "sll" (ARG: SIGNED; COUNT: INTEGER) return SIGNED; --!V87
-- Result subtype: SIGNED(ARG'LENGTH-1 downto 0)
-- Result: SHIFT_LEFT(ARG, COUNT)
------------------------------------------------------------------------------
-- Note : Function S.11 is not compatible with VHDL 1076-1987. Comment
-- out the function (declaration and body) for VHDL 1076-1987 compatibility.
------------------------------------------------------------------------------
-- Id: S.11
function "srl" (ARG: UNSIGNED; COUNT: INTEGER) return UNSIGNED; --!V87
-- Result subtype: UNSIGNED(ARG'LENGTH-1 downto 0)
-- Result: SHIFT_RIGHT(ARG, COUNT)
------------------------------------------------------------------------------
-- Note : Function S.12 is not compatible with VHDL 1076-1987. Comment
-- out the function (declaration and body) for VHDL 1076-1987 compatibility.
------------------------------------------------------------------------------
-- Id: S.12
function "srl" (ARG: SIGNED; COUNT: INTEGER) return SIGNED; --!V87
-- Result subtype: SIGNED(ARG'LENGTH-1 downto 0)
-- Result: SIGNED(SHIFT_RIGHT(UNSIGNED(ARG), COUNT))
------------------------------------------------------------------------------
-- Note : Function S.13 is not compatible with VHDL 1076-1987. Comment
-- out the function (declaration and body) for VHDL 1076-1987 compatibility.
------------------------------------------------------------------------------
-- Id: S.13
function "rol" (ARG: UNSIGNED; COUNT: INTEGER) return UNSIGNED; --!V87
-- Result subtype: UNSIGNED(ARG'LENGTH-1 downto 0)
-- Result: ROTATE_LEFT(ARG, COUNT)
------------------------------------------------------------------------------
-- Note : Function S.14 is not compatible with VHDL 1076-1987. Comment
-- out the function (declaration and body) for VHDL 1076-1987 compatibility.
------------------------------------------------------------------------------
-- Id: S.14
function "rol" (ARG: SIGNED; COUNT: INTEGER) return SIGNED; --!V87
-- Result subtype: SIGNED(ARG'LENGTH-1 downto 0)
-- Result: ROTATE_LEFT(ARG, COUNT)
------------------------------------------------------------------------------
-- Note : Function S.15 is not compatible with VHDL 1076-1987. Comment
-- out the function (declaration and body) for VHDL 1076-1987 compatibility.
------------------------------------------------------------------------------
-- Id: S.15
function "ror" (ARG: UNSIGNED; COUNT: INTEGER) return UNSIGNED; --!V87
-- Result subtype: UNSIGNED(ARG'LENGTH-1 downto 0)
-- Result: ROTATE_RIGHT(ARG, COUNT)
------------------------------------------------------------------------------
-- Note : Function S.16 is not compatible with VHDL 1076-1987. Comment
-- out the function (declaration and body) for VHDL 1076-1987 compatibility.
------------------------------------------------------------------------------
-- Id: S.16
function "ror" (ARG: SIGNED; COUNT: INTEGER) return SIGNED; --!V87
-- Result subtype: SIGNED(ARG'LENGTH-1 downto 0)
-- Result: ROTATE_RIGHT(ARG, COUNT)
--============================================================================
-- RESIZE Functions
--============================================================================
-- Id: R.1
function RESIZE (ARG: SIGNED; NEW_SIZE: NATURAL) return SIGNED;
-- Result subtype: SIGNED(NEW_SIZE-1 downto 0)
-- Result: Resizes the SIGNED vector ARG to the specified size.
-- To create a larger vector, the new [leftmost] bit positions
-- are filled with the sign bit (ARG'LEFT). When truncating,
-- the sign bit is retained along with the rightmost part.
-- Id: R.2
function RESIZE (ARG: UNSIGNED; NEW_SIZE: NATURAL) return UNSIGNED;
-- Result subtype: UNSIGNED(NEW_SIZE-1 downto 0)
-- Result: Resizes the SIGNED vector ARG to the specified size.
-- To create a larger vector, the new [leftmost] bit positions
-- are filled with '0'. When truncating, the leftmost bits
-- are dropped.
--============================================================================
-- Conversion Functions
--============================================================================
-- Id: D.1
function TO_INTEGER (ARG: UNSIGNED) return NATURAL;
-- Result subtype: NATURAL. Value cannot be negative since parameter is an
-- UNSIGNED vector.
-- Result: Converts the UNSIGNED vector to an INTEGER.
-- Id: D.2
function TO_INTEGER (ARG: SIGNED) return INTEGER;
-- Result subtype: INTEGER
-- Result: Converts a SIGNED vector to an INTEGER.
-- Id: D.3
function TO_UNSIGNED (ARG, SIZE: NATURAL) return UNSIGNED;
-- Result subtype: UNSIGNED(SIZE-1 downto 0)
-- Result: Converts a non-negative INTEGER to an UNSIGNED vector with
-- the specified SIZE.
-- Id: D.4
function TO_SIGNED (ARG: INTEGER; SIZE: NATURAL) return SIGNED;
-- Result subtype: SIGNED(SIZE-1 downto 0)
-- Result: Converts an INTEGER to a SIGNED vector of the specified SIZE.
--============================================================================
-- Logical Operators
--============================================================================
-- Id: L.1
function "not" (L: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(L'LENGTH-1 downto 0)
-- Result: Termwise inversion
-- Id: L.2
function "and" (L, R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(L'LENGTH-1 downto 0)
-- Result: Vector AND operation
-- Id: L.3
function "or" (L, R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(L'LENGTH-1 downto 0)
-- Result: Vector OR operation
-- Id: L.4
function "nand" (L, R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(L'LENGTH-1 downto 0)
-- Result: Vector NAND operation
-- Id: L.5
function "nor" (L, R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(L'LENGTH-1 downto 0)
-- Result: Vector NOR operation
-- Id: L.6
function "xor" (L, R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(L'LENGTH-1 downto 0)
-- Result: Vector XOR operation
-- ---------------------------------------------------------------------------
-- Note : Function L.7 is not compatible with VHDL 1076-1987. Comment
-- out the function (declaration and body) for VHDL 1076-1987 compatibility.
-- ---------------------------------------------------------------------------
-- Id: L.7
function "xnor" (L, R: UNSIGNED) return UNSIGNED; --!V87
-- Result subtype: UNSIGNED(L'LENGTH-1 downto 0)
-- Result: Vector XNOR operation
-- Id: L.8
function "not" (L: SIGNED) return SIGNED;
-- Result subtype: SIGNED(L'LENGTH-1 downto 0)
-- Result: Termwise inversion
-- Id: L.9
function "and" (L, R: SIGNED) return SIGNED;
-- Result subtype: SIGNED(L'LENGTH-1 downto 0)
-- Result: Vector AND operation
-- Id: L.10
function "or" (L, R: SIGNED) return SIGNED;
-- Result subtype: SIGNED(L'LENGTH-1 downto 0)
-- Result: Vector OR operation
-- Id: L.11
function "nand" (L, R: SIGNED) return SIGNED;
-- Result subtype: SIGNED(L'LENGTH-1 downto 0)
-- Result: Vector NAND operation
-- Id: L.12
function "nor" (L, R: SIGNED) return SIGNED;
-- Result subtype: SIGNED(L'LENGTH-1 downto 0)
-- Result: Vector NOR operation
-- Id: L.13
function "xor" (L, R: SIGNED) return SIGNED;
-- Result subtype: SIGNED(L'LENGTH-1 downto 0)
-- Result: Vector XOR operation
-- ---------------------------------------------------------------------------
-- Note : Function L.14 is not compatible with VHDL 1076-1987. Comment
-- out the function (declaration and body) for VHDL 1076-1987 compatibility.
-- ---------------------------------------------------------------------------
-- Id: L.14
function "xnor" (L, R: SIGNED) return SIGNED; --!V87
-- Result subtype: SIGNED(L'LENGTH-1 downto 0)
-- Result: Vector XNOR operation
--============================================================================
-- Match Functions
--============================================================================
-- Id: M.1
function STD_MATCH (L, R: STD_ULOGIC) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: terms compared per STD_LOGIC_1164 intent
-- Id: M.2
function STD_MATCH (L, R: UNSIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: terms compared per STD_LOGIC_1164 intent
-- Id: M.3
function STD_MATCH (L, R: SIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: terms compared per STD_LOGIC_1164 intent
-- Id: M.4
function STD_MATCH (L, R: STD_LOGIC_VECTOR) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: terms compared per STD_LOGIC_1164 intent
-- Id: M.5
function STD_MATCH (L, R: STD_ULOGIC_VECTOR) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: terms compared per STD_LOGIC_1164 intent
--============================================================================
-- Translation Functions
--============================================================================
-- Id: T.1
function TO_01 (S: UNSIGNED; XMAP: STD_LOGIC := '0') return UNSIGNED;
-- Result subtype: UNSIGNED(S'RANGE)
-- Result: Termwise, 'H' is translated to '1', and 'L' is translated
-- to '0'. If a value other than '0'|'1'|'H'|'L' is found,
-- the array is set to (others => XMAP), and a warning is
-- issued.
-- Id: T.2
function TO_01 (S: SIGNED; XMAP: STD_LOGIC := '0') return SIGNED;
-- Result subtype: SIGNED(S'RANGE)
-- Result: Termwise, 'H' is translated to '1', and 'L' is translated
-- to '0'. If a value other than '0'|'1'|'H'|'L' is found,
-- the array is set to (others => XMAP), and a warning is
-- issued.
end NUMERIC_STD;
|
-- --------------------------------------------------------------------
--
-- Copyright 1995 by IEEE. All rights reserved.
--
-- This source file is considered by the IEEE to be an essential part of the use
-- of the standard 1076.3 and as such may be distributed without change, except
-- as permitted by the standard. This source file may not be sold or distributed
-- for profit. This package may be modified to include additional data required
-- by tools, but must in no way change the external interfaces or simulation
-- behaviour of the description. It is permissible to add comments and/or
-- attributes to the package declarations, but not to change or delete any
-- original lines of the approved package declaration. The package body may be
-- changed only in accordance with the terms of clauses 7.1 and 7.2 of the
-- standard.
--
-- Title : Standard VHDL Synthesis Package (1076.3, NUMERIC_STD)
--
-- Library : This package shall be compiled into a library symbolically
-- : named IEEE.
--
-- Developers : IEEE DASC Synthesis Working Group, PAR 1076.3
--
-- Purpose : This package defines numeric types and arithmetic functions
-- : for use with synthesis tools. Two numeric types are defined:
-- : -- > UNSIGNED: represents UNSIGNED number in vector form
-- : -- > SIGNED: represents a SIGNED number in vector form
-- : The base element type is type STD_LOGIC.
-- : The leftmost bit is treated as the most significant bit.
-- : Signed vectors are represented in two's complement form.
-- : This package contains overloaded arithmetic operators on
-- : the SIGNED and UNSIGNED types. The package also contains
-- : useful type conversions functions.
-- :
-- : If any argument to a function is a null array, a null array is
-- : returned (exceptions, if any, are noted individually).
--
-- Limitation :
--
-- Note : No declarations or definitions shall be included in,
-- : or excluded from this package. The "package declaration"
-- : defines the types, subtypes and declarations of
-- : NUMERIC_STD. The NUMERIC_STD package body shall be
-- : considered the formal definition of the semantics of
-- : this package. Tool developers may choose to implement
-- : the package body in the most efficient manner available
-- : to them.
--
-- --------------------------------------------------------------------
-- modification history :
-- --------------------------------------------------------------------
-- Version: 2.4
-- Date : 12 April 1995
-- -----------------------------------------------------------------------------
library IEEE;
use IEEE.STD_LOGIC_1164.all;
package NUMERIC_STD is
constant CopyRightNotice: STRING
:= "Copyright 1995 IEEE. All rights reserved.";
--============================================================================
-- Numeric array type definitions
--============================================================================
type UNSIGNED is array (NATURAL range <>) of STD_LOGIC;
type SIGNED is array (NATURAL range <>) of STD_LOGIC;
--============================================================================
-- Arithmetic Operators:
--===========================================================================
-- Id: A.1
function "abs" (ARG: SIGNED) return SIGNED;
-- Result subtype: SIGNED(ARG'LENGTH-1 downto 0).
-- Result: Returns the absolute value of a SIGNED vector ARG.
-- Id: A.2
function "-" (ARG: SIGNED) return SIGNED;
-- Result subtype: SIGNED(ARG'LENGTH-1 downto 0).
-- Result: Returns the value of the unary minus operation on a
-- SIGNED vector ARG.
--============================================================================
-- Id: A.3
function "+" (L, R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(MAX(L'LENGTH, R'LENGTH)-1 downto 0).
-- Result: Adds two UNSIGNED vectors that may be of different lengths.
-- Id: A.4
function "+" (L, R: SIGNED) return SIGNED;
-- Result subtype: SIGNED(MAX(L'LENGTH, R'LENGTH)-1 downto 0).
-- Result: Adds two SIGNED vectors that may be of different lengths.
-- Id: A.5
function "+" (L: UNSIGNED; R: NATURAL) return UNSIGNED;
-- Result subtype: UNSIGNED(L'LENGTH-1 downto 0).
-- Result: Adds an UNSIGNED vector, L, with a non-negative INTEGER, R.
-- Id: A.6
function "+" (L: NATURAL; R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(R'LENGTH-1 downto 0).
-- Result: Adds a non-negative INTEGER, L, with an UNSIGNED vector, R.
-- Id: A.7
function "+" (L: INTEGER; R: SIGNED) return SIGNED;
-- Result subtype: SIGNED(R'LENGTH-1 downto 0).
-- Result: Adds an INTEGER, L(may be positive or negative), to a SIGNED
-- vector, R.
-- Id: A.8
function "+" (L: SIGNED; R: INTEGER) return SIGNED;
-- Result subtype: SIGNED(L'LENGTH-1 downto 0).
-- Result: Adds a SIGNED vector, L, to an INTEGER, R.
--============================================================================
-- Id: A.9
function "-" (L, R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(MAX(L'LENGTH, R'LENGTH)-1 downto 0).
-- Result: Subtracts two UNSIGNED vectors that may be of different lengths.
-- Id: A.10
function "-" (L, R: SIGNED) return SIGNED;
-- Result subtype: SIGNED(MAX(L'LENGTH, R'LENGTH)-1 downto 0).
-- Result: Subtracts a SIGNED vector, R, from another SIGNED vector, L,
-- that may possibly be of different lengths.
-- Id: A.11
function "-" (L: UNSIGNED;R: NATURAL) return UNSIGNED;
-- Result subtype: UNSIGNED(L'LENGTH-1 downto 0).
-- Result: Subtracts a non-negative INTEGER, R, from an UNSIGNED vector, L.
-- Id: A.12
function "-" (L: NATURAL; R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(R'LENGTH-1 downto 0).
-- Result: Subtracts an UNSIGNED vector, R, from a non-negative INTEGER, L.
-- Id: A.13
function "-" (L: SIGNED; R: INTEGER) return SIGNED;
-- Result subtype: SIGNED(L'LENGTH-1 downto 0).
-- Result: Subtracts an INTEGER, R, from a SIGNED vector, L.
-- Id: A.14
function "-" (L: INTEGER; R: SIGNED) return SIGNED;
-- Result subtype: SIGNED(R'LENGTH-1 downto 0).
-- Result: Subtracts a SIGNED vector, R, from an INTEGER, L.
--============================================================================
-- Id: A.15
function "*" (L, R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED((L'LENGTH+R'LENGTH-1) downto 0).
-- Result: Performs the multiplication operation on two UNSIGNED vectors
-- that may possibly be of different lengths.
-- Id: A.16
function "*" (L, R: SIGNED) return SIGNED;
-- Result subtype: SIGNED((L'LENGTH+R'LENGTH-1) downto 0)
-- Result: Multiplies two SIGNED vectors that may possibly be of
-- different lengths.
-- Id: A.17
function "*" (L: UNSIGNED; R: NATURAL) return UNSIGNED;
-- Result subtype: UNSIGNED((L'LENGTH+L'LENGTH-1) downto 0).
-- Result: Multiplies an UNSIGNED vector, L, with a non-negative
-- INTEGER, R. R is converted to an UNSIGNED vector of
-- SIZE L'LENGTH before multiplication.
-- Id: A.18
function "*" (L: NATURAL; R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED((R'LENGTH+R'LENGTH-1) downto 0).
-- Result: Multiplies an UNSIGNED vector, R, with a non-negative
-- INTEGER, L. L is converted to an UNSIGNED vector of
-- SIZE R'LENGTH before multiplication.
-- Id: A.19
function "*" (L: SIGNED; R: INTEGER) return SIGNED;
-- Result subtype: SIGNED((L'LENGTH+L'LENGTH-1) downto 0)
-- Result: Multiplies a SIGNED vector, L, with an INTEGER, R. R is
-- converted to a SIGNED vector of SIZE L'LENGTH before
-- multiplication.
-- Id: A.20
function "*" (L: INTEGER; R: SIGNED) return SIGNED;
-- Result subtype: SIGNED((R'LENGTH+R'LENGTH-1) downto 0)
-- Result: Multiplies a SIGNED vector, R, with an INTEGER, L. L is
-- converted to a SIGNED vector of SIZE R'LENGTH before
-- multiplication.
--============================================================================
--
-- NOTE: If second argument is zero for "/" operator, a severity level
-- of ERROR is issued.
-- Id: A.21
function "/" (L, R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(L'LENGTH-1 downto 0)
-- Result: Divides an UNSIGNED vector, L, by another UNSIGNED vector, R.
-- Id: A.22
function "/" (L, R: SIGNED) return SIGNED;
-- Result subtype: SIGNED(L'LENGTH-1 downto 0)
-- Result: Divides an SIGNED vector, L, by another SIGNED vector, R.
-- Id: A.23
function "/" (L: UNSIGNED; R: NATURAL) return UNSIGNED;
-- Result subtype: UNSIGNED(L'LENGTH-1 downto 0)
-- Result: Divides an UNSIGNED vector, L, by a non-negative INTEGER, R.
-- If NO_OF_BITS(R) > L'LENGTH, result is truncated to L'LENGTH.
-- Id: A.24
function "/" (L: NATURAL; R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(R'LENGTH-1 downto 0)
-- Result: Divides a non-negative INTEGER, L, by an UNSIGNED vector, R.
-- If NO_OF_BITS(L) > R'LENGTH, result is truncated to R'LENGTH.
-- Id: A.25
function "/" (L: SIGNED; R: INTEGER) return SIGNED;
-- Result subtype: SIGNED(L'LENGTH-1 downto 0)
-- Result: Divides a SIGNED vector, L, by an INTEGER, R.
-- If NO_OF_BITS(R) > L'LENGTH, result is truncated to L'LENGTH.
-- Id: A.26
function "/" (L: INTEGER; R: SIGNED) return SIGNED;
-- Result subtype: SIGNED(R'LENGTH-1 downto 0)
-- Result: Divides an INTEGER, L, by a SIGNED vector, R.
-- If NO_OF_BITS(L) > R'LENGTH, result is truncated to R'LENGTH.
--============================================================================
--
-- NOTE: If second argument is zero for "rem" operator, a severity level
-- of ERROR is issued.
-- Id: A.27
function "rem" (L, R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(R'LENGTH-1 downto 0)
-- Result: Computes "L rem R" where L and R are UNSIGNED vectors.
-- Id: A.28
function "rem" (L, R: SIGNED) return SIGNED;
-- Result subtype: SIGNED(R'LENGTH-1 downto 0)
-- Result: Computes "L rem R" where L and R are SIGNED vectors.
-- Id: A.29
function "rem" (L: UNSIGNED; R: NATURAL) return UNSIGNED;
-- Result subtype: UNSIGNED(L'LENGTH-1 downto 0)
-- Result: Computes "L rem R" where L is an UNSIGNED vector and R is a
-- non-negative INTEGER.
-- If NO_OF_BITS(R) > L'LENGTH, result is truncated to L'LENGTH.
-- Id: A.30
function "rem" (L: NATURAL; R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(R'LENGTH-1 downto 0)
-- Result: Computes "L rem R" where R is an UNSIGNED vector and L is a
-- non-negative INTEGER.
-- If NO_OF_BITS(L) > R'LENGTH, result is truncated to R'LENGTH.
-- Id: A.31
function "rem" (L: SIGNED; R: INTEGER) return SIGNED;
-- Result subtype: SIGNED(L'LENGTH-1 downto 0)
-- Result: Computes "L rem R" where L is SIGNED vector and R is an INTEGER.
-- If NO_OF_BITS(R) > L'LENGTH, result is truncated to L'LENGTH.
-- Id: A.32
function "rem" (L: INTEGER; R: SIGNED) return SIGNED;
-- Result subtype: SIGNED(R'LENGTH-1 downto 0)
-- Result: Computes "L rem R" where R is SIGNED vector and L is an INTEGER.
-- If NO_OF_BITS(L) > R'LENGTH, result is truncated to R'LENGTH.
--============================================================================
--
-- NOTE: If second argument is zero for "mod" operator, a severity level
-- of ERROR is issued.
-- Id: A.33
function "mod" (L, R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(R'LENGTH-1 downto 0)
-- Result: Computes "L mod R" where L and R are UNSIGNED vectors.
-- Id: A.34
function "mod" (L, R: SIGNED) return SIGNED;
-- Result subtype: SIGNED(R'LENGTH-1 downto 0)
-- Result: Computes "L mod R" where L and R are SIGNED vectors.
-- Id: A.35
function "mod" (L: UNSIGNED; R: NATURAL) return UNSIGNED;
-- Result subtype: UNSIGNED(L'LENGTH-1 downto 0)
-- Result: Computes "L mod R" where L is an UNSIGNED vector and R
-- is a non-negative INTEGER.
-- If NO_OF_BITS(R) > L'LENGTH, result is truncated to L'LENGTH.
-- Id: A.36
function "mod" (L: NATURAL; R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(R'LENGTH-1 downto 0)
-- Result: Computes "L mod R" where R is an UNSIGNED vector and L
-- is a non-negative INTEGER.
-- If NO_OF_BITS(L) > R'LENGTH, result is truncated to R'LENGTH.
-- Id: A.37
function "mod" (L: SIGNED; R: INTEGER) return SIGNED;
-- Result subtype: SIGNED(L'LENGTH-1 downto 0)
-- Result: Computes "L mod R" where L is a SIGNED vector and
-- R is an INTEGER.
-- If NO_OF_BITS(R) > L'LENGTH, result is truncated to L'LENGTH.
-- Id: A.38
function "mod" (L: INTEGER; R: SIGNED) return SIGNED;
-- Result subtype: SIGNED(R'LENGTH-1 downto 0)
-- Result: Computes "L mod R" where L is an INTEGER and
-- R is a SIGNED vector.
-- If NO_OF_BITS(L) > R'LENGTH, result is truncated to R'LENGTH.
--============================================================================
-- Comparison Operators
--============================================================================
-- Id: C.1
function ">" (L, R: UNSIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L > R" where L and R are UNSIGNED vectors possibly
-- of different lengths.
-- Id: C.2
function ">" (L, R: SIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L > R" where L and R are SIGNED vectors possibly
-- of different lengths.
-- Id: C.3
function ">" (L: NATURAL; R: UNSIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L > R" where L is a non-negative INTEGER and
-- R is an UNSIGNED vector.
-- Id: C.4
function ">" (L: INTEGER; R: SIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L > R" where L is a INTEGER and
-- R is a SIGNED vector.
-- Id: C.5
function ">" (L: UNSIGNED; R: NATURAL) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L > R" where L is an UNSIGNED vector and
-- R is a non-negative INTEGER.
-- Id: C.6
function ">" (L: SIGNED; R: INTEGER) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L > R" where L is a SIGNED vector and
-- R is a INTEGER.
--============================================================================
-- Id: C.7
function "<" (L, R: UNSIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L < R" where L and R are UNSIGNED vectors possibly
-- of different lengths.
-- Id: C.8
function "<" (L, R: SIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L < R" where L and R are SIGNED vectors possibly
-- of different lengths.
-- Id: C.9
function "<" (L: NATURAL; R: UNSIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L < R" where L is a non-negative INTEGER and
-- R is an UNSIGNED vector.
-- Id: C.10
function "<" (L: INTEGER; R: SIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L < R" where L is an INTEGER and
-- R is a SIGNED vector.
-- Id: C.11
function "<" (L: UNSIGNED; R: NATURAL) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L < R" where L is an UNSIGNED vector and
-- R is a non-negative INTEGER.
-- Id: C.12
function "<" (L: SIGNED; R: INTEGER) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L < R" where L is a SIGNED vector and
-- R is an INTEGER.
--============================================================================
-- Id: C.13
function "<=" (L, R: UNSIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L <= R" where L and R are UNSIGNED vectors possibly
-- of different lengths.
-- Id: C.14
function "<=" (L, R: SIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L <= R" where L and R are SIGNED vectors possibly
-- of different lengths.
-- Id: C.15
function "<=" (L: NATURAL; R: UNSIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L <= R" where L is a non-negative INTEGER and
-- R is an UNSIGNED vector.
-- Id: C.16
function "<=" (L: INTEGER; R: SIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L <= R" where L is an INTEGER and
-- R is a SIGNED vector.
-- Id: C.17
function "<=" (L: UNSIGNED; R: NATURAL) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L <= R" where L is an UNSIGNED vector and
-- R is a non-negative INTEGER.
-- Id: C.18
function "<=" (L: SIGNED; R: INTEGER) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L <= R" where L is a SIGNED vector and
-- R is an INTEGER.
--============================================================================
-- Id: C.19
function ">=" (L, R: UNSIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L >= R" where L and R are UNSIGNED vectors possibly
-- of different lengths.
-- Id: C.20
function ">=" (L, R: SIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L >= R" where L and R are SIGNED vectors possibly
-- of different lengths.
-- Id: C.21
function ">=" (L: NATURAL; R: UNSIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L >= R" where L is a non-negative INTEGER and
-- R is an UNSIGNED vector.
-- Id: C.22
function ">=" (L: INTEGER; R: SIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L >= R" where L is an INTEGER and
-- R is a SIGNED vector.
-- Id: C.23
function ">=" (L: UNSIGNED; R: NATURAL) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L >= R" where L is an UNSIGNED vector and
-- R is a non-negative INTEGER.
-- Id: C.24
function ">=" (L: SIGNED; R: INTEGER) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L >= R" where L is a SIGNED vector and
-- R is an INTEGER.
--============================================================================
-- Id: C.25
function "=" (L, R: UNSIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L = R" where L and R are UNSIGNED vectors possibly
-- of different lengths.
-- Id: C.26
function "=" (L, R: SIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L = R" where L and R are SIGNED vectors possibly
-- of different lengths.
-- Id: C.27
function "=" (L: NATURAL; R: UNSIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L = R" where L is a non-negative INTEGER and
-- R is an UNSIGNED vector.
-- Id: C.28
function "=" (L: INTEGER; R: SIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L = R" where L is an INTEGER and
-- R is a SIGNED vector.
-- Id: C.29
function "=" (L: UNSIGNED; R: NATURAL) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L = R" where L is an UNSIGNED vector and
-- R is a non-negative INTEGER.
-- Id: C.30
function "=" (L: SIGNED; R: INTEGER) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L = R" where L is a SIGNED vector and
-- R is an INTEGER.
--============================================================================
-- Id: C.31
function "/=" (L, R: UNSIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L /= R" where L and R are UNSIGNED vectors possibly
-- of different lengths.
-- Id: C.32
function "/=" (L, R: SIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L /= R" where L and R are SIGNED vectors possibly
-- of different lengths.
-- Id: C.33
function "/=" (L: NATURAL; R: UNSIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L /= R" where L is a non-negative INTEGER and
-- R is an UNSIGNED vector.
-- Id: C.34
function "/=" (L: INTEGER; R: SIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L /= R" where L is an INTEGER and
-- R is a SIGNED vector.
-- Id: C.35
function "/=" (L: UNSIGNED; R: NATURAL) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L /= R" where L is an UNSIGNED vector and
-- R is a non-negative INTEGER.
-- Id: C.36
function "/=" (L: SIGNED; R: INTEGER) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: Computes "L /= R" where L is a SIGNED vector and
-- R is an INTEGER.
--============================================================================
-- Shift and Rotate Functions
--============================================================================
-- Id: S.1
function SHIFT_LEFT (ARG: UNSIGNED; COUNT: NATURAL) return UNSIGNED;
-- Result subtype: UNSIGNED(ARG'LENGTH-1 downto 0)
-- Result: Performs a shift-left on an UNSIGNED vector COUNT times.
-- The vacated positions are filled with '0'.
-- The COUNT leftmost elements are lost.
-- Id: S.2
function SHIFT_RIGHT (ARG: UNSIGNED; COUNT: NATURAL) return UNSIGNED;
-- Result subtype: UNSIGNED(ARG'LENGTH-1 downto 0)
-- Result: Performs a shift-right on an UNSIGNED vector COUNT times.
-- The vacated positions are filled with '0'.
-- The COUNT rightmost elements are lost.
-- Id: S.3
function SHIFT_LEFT (ARG: SIGNED; COUNT: NATURAL) return SIGNED;
-- Result subtype: SIGNED(ARG'LENGTH-1 downto 0)
-- Result: Performs a shift-left on a SIGNED vector COUNT times.
-- The vacated positions are filled with '0'.
-- The COUNT leftmost elements are lost.
-- Id: S.4
function SHIFT_RIGHT (ARG: SIGNED; COUNT: NATURAL) return SIGNED;
-- Result subtype: SIGNED(ARG'LENGTH-1 downto 0)
-- Result: Performs a shift-right on a SIGNED vector COUNT times.
-- The vacated positions are filled with the leftmost
-- element, ARG'LEFT. The COUNT rightmost elements are lost.
--============================================================================
-- Id: S.5
function ROTATE_LEFT (ARG: UNSIGNED; COUNT: NATURAL) return UNSIGNED;
-- Result subtype: UNSIGNED(ARG'LENGTH-1 downto 0)
-- Result: Performs a rotate-left of an UNSIGNED vector COUNT times.
-- Id: S.6
function ROTATE_RIGHT (ARG: UNSIGNED; COUNT: NATURAL) return UNSIGNED;
-- Result subtype: UNSIGNED(ARG'LENGTH-1 downto 0)
-- Result: Performs a rotate-right of an UNSIGNED vector COUNT times.
-- Id: S.7
function ROTATE_LEFT (ARG: SIGNED; COUNT: NATURAL) return SIGNED;
-- Result subtype: SIGNED(ARG'LENGTH-1 downto 0)
-- Result: Performs a logical rotate-left of a SIGNED
-- vector COUNT times.
-- Id: S.8
function ROTATE_RIGHT (ARG: SIGNED; COUNT: NATURAL) return SIGNED;
-- Result subtype: SIGNED(ARG'LENGTH-1 downto 0)
-- Result: Performs a logical rotate-right of a SIGNED
-- vector COUNT times.
--============================================================================
--============================================================================
------------------------------------------------------------------------------
-- Note : Function S.9 is not compatible with VHDL 1076-1987. Comment
-- out the function (declaration and body) for VHDL 1076-1987 compatibility.
------------------------------------------------------------------------------
-- Id: S.9
function "sll" (ARG: UNSIGNED; COUNT: INTEGER) return UNSIGNED; --!V87
-- Result subtype: UNSIGNED(ARG'LENGTH-1 downto 0)
-- Result: SHIFT_LEFT(ARG, COUNT)
------------------------------------------------------------------------------
-- Note : Function S.10 is not compatible with VHDL 1076-1987. Comment
-- out the function (declaration and body) for VHDL 1076-1987 compatibility.
------------------------------------------------------------------------------
-- Id: S.10
function "sll" (ARG: SIGNED; COUNT: INTEGER) return SIGNED; --!V87
-- Result subtype: SIGNED(ARG'LENGTH-1 downto 0)
-- Result: SHIFT_LEFT(ARG, COUNT)
------------------------------------------------------------------------------
-- Note : Function S.11 is not compatible with VHDL 1076-1987. Comment
-- out the function (declaration and body) for VHDL 1076-1987 compatibility.
------------------------------------------------------------------------------
-- Id: S.11
function "srl" (ARG: UNSIGNED; COUNT: INTEGER) return UNSIGNED; --!V87
-- Result subtype: UNSIGNED(ARG'LENGTH-1 downto 0)
-- Result: SHIFT_RIGHT(ARG, COUNT)
------------------------------------------------------------------------------
-- Note : Function S.12 is not compatible with VHDL 1076-1987. Comment
-- out the function (declaration and body) for VHDL 1076-1987 compatibility.
------------------------------------------------------------------------------
-- Id: S.12
function "srl" (ARG: SIGNED; COUNT: INTEGER) return SIGNED; --!V87
-- Result subtype: SIGNED(ARG'LENGTH-1 downto 0)
-- Result: SIGNED(SHIFT_RIGHT(UNSIGNED(ARG), COUNT))
------------------------------------------------------------------------------
-- Note : Function S.13 is not compatible with VHDL 1076-1987. Comment
-- out the function (declaration and body) for VHDL 1076-1987 compatibility.
------------------------------------------------------------------------------
-- Id: S.13
function "rol" (ARG: UNSIGNED; COUNT: INTEGER) return UNSIGNED; --!V87
-- Result subtype: UNSIGNED(ARG'LENGTH-1 downto 0)
-- Result: ROTATE_LEFT(ARG, COUNT)
------------------------------------------------------------------------------
-- Note : Function S.14 is not compatible with VHDL 1076-1987. Comment
-- out the function (declaration and body) for VHDL 1076-1987 compatibility.
------------------------------------------------------------------------------
-- Id: S.14
function "rol" (ARG: SIGNED; COUNT: INTEGER) return SIGNED; --!V87
-- Result subtype: SIGNED(ARG'LENGTH-1 downto 0)
-- Result: ROTATE_LEFT(ARG, COUNT)
------------------------------------------------------------------------------
-- Note : Function S.15 is not compatible with VHDL 1076-1987. Comment
-- out the function (declaration and body) for VHDL 1076-1987 compatibility.
------------------------------------------------------------------------------
-- Id: S.15
function "ror" (ARG: UNSIGNED; COUNT: INTEGER) return UNSIGNED; --!V87
-- Result subtype: UNSIGNED(ARG'LENGTH-1 downto 0)
-- Result: ROTATE_RIGHT(ARG, COUNT)
------------------------------------------------------------------------------
-- Note : Function S.16 is not compatible with VHDL 1076-1987. Comment
-- out the function (declaration and body) for VHDL 1076-1987 compatibility.
------------------------------------------------------------------------------
-- Id: S.16
function "ror" (ARG: SIGNED; COUNT: INTEGER) return SIGNED; --!V87
-- Result subtype: SIGNED(ARG'LENGTH-1 downto 0)
-- Result: ROTATE_RIGHT(ARG, COUNT)
--============================================================================
-- RESIZE Functions
--============================================================================
-- Id: R.1
function RESIZE (ARG: SIGNED; NEW_SIZE: NATURAL) return SIGNED;
-- Result subtype: SIGNED(NEW_SIZE-1 downto 0)
-- Result: Resizes the SIGNED vector ARG to the specified size.
-- To create a larger vector, the new [leftmost] bit positions
-- are filled with the sign bit (ARG'LEFT). When truncating,
-- the sign bit is retained along with the rightmost part.
-- Id: R.2
function RESIZE (ARG: UNSIGNED; NEW_SIZE: NATURAL) return UNSIGNED;
-- Result subtype: UNSIGNED(NEW_SIZE-1 downto 0)
-- Result: Resizes the SIGNED vector ARG to the specified size.
-- To create a larger vector, the new [leftmost] bit positions
-- are filled with '0'. When truncating, the leftmost bits
-- are dropped.
--============================================================================
-- Conversion Functions
--============================================================================
-- Id: D.1
function TO_INTEGER (ARG: UNSIGNED) return NATURAL;
-- Result subtype: NATURAL. Value cannot be negative since parameter is an
-- UNSIGNED vector.
-- Result: Converts the UNSIGNED vector to an INTEGER.
-- Id: D.2
function TO_INTEGER (ARG: SIGNED) return INTEGER;
-- Result subtype: INTEGER
-- Result: Converts a SIGNED vector to an INTEGER.
-- Id: D.3
function TO_UNSIGNED (ARG, SIZE: NATURAL) return UNSIGNED;
-- Result subtype: UNSIGNED(SIZE-1 downto 0)
-- Result: Converts a non-negative INTEGER to an UNSIGNED vector with
-- the specified SIZE.
-- Id: D.4
function TO_SIGNED (ARG: INTEGER; SIZE: NATURAL) return SIGNED;
-- Result subtype: SIGNED(SIZE-1 downto 0)
-- Result: Converts an INTEGER to a SIGNED vector of the specified SIZE.
--============================================================================
-- Logical Operators
--============================================================================
-- Id: L.1
function "not" (L: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(L'LENGTH-1 downto 0)
-- Result: Termwise inversion
-- Id: L.2
function "and" (L, R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(L'LENGTH-1 downto 0)
-- Result: Vector AND operation
-- Id: L.3
function "or" (L, R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(L'LENGTH-1 downto 0)
-- Result: Vector OR operation
-- Id: L.4
function "nand" (L, R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(L'LENGTH-1 downto 0)
-- Result: Vector NAND operation
-- Id: L.5
function "nor" (L, R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(L'LENGTH-1 downto 0)
-- Result: Vector NOR operation
-- Id: L.6
function "xor" (L, R: UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(L'LENGTH-1 downto 0)
-- Result: Vector XOR operation
-- ---------------------------------------------------------------------------
-- Note : Function L.7 is not compatible with VHDL 1076-1987. Comment
-- out the function (declaration and body) for VHDL 1076-1987 compatibility.
-- ---------------------------------------------------------------------------
-- Id: L.7
function "xnor" (L, R: UNSIGNED) return UNSIGNED; --!V87
-- Result subtype: UNSIGNED(L'LENGTH-1 downto 0)
-- Result: Vector XNOR operation
-- Id: L.8
function "not" (L: SIGNED) return SIGNED;
-- Result subtype: SIGNED(L'LENGTH-1 downto 0)
-- Result: Termwise inversion
-- Id: L.9
function "and" (L, R: SIGNED) return SIGNED;
-- Result subtype: SIGNED(L'LENGTH-1 downto 0)
-- Result: Vector AND operation
-- Id: L.10
function "or" (L, R: SIGNED) return SIGNED;
-- Result subtype: SIGNED(L'LENGTH-1 downto 0)
-- Result: Vector OR operation
-- Id: L.11
function "nand" (L, R: SIGNED) return SIGNED;
-- Result subtype: SIGNED(L'LENGTH-1 downto 0)
-- Result: Vector NAND operation
-- Id: L.12
function "nor" (L, R: SIGNED) return SIGNED;
-- Result subtype: SIGNED(L'LENGTH-1 downto 0)
-- Result: Vector NOR operation
-- Id: L.13
function "xor" (L, R: SIGNED) return SIGNED;
-- Result subtype: SIGNED(L'LENGTH-1 downto 0)
-- Result: Vector XOR operation
-- ---------------------------------------------------------------------------
-- Note : Function L.14 is not compatible with VHDL 1076-1987. Comment
-- out the function (declaration and body) for VHDL 1076-1987 compatibility.
-- ---------------------------------------------------------------------------
-- Id: L.14
function "xnor" (L, R: SIGNED) return SIGNED; --!V87
-- Result subtype: SIGNED(L'LENGTH-1 downto 0)
-- Result: Vector XNOR operation
--============================================================================
-- Match Functions
--============================================================================
-- Id: M.1
function STD_MATCH (L, R: STD_ULOGIC) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: terms compared per STD_LOGIC_1164 intent
-- Id: M.2
function STD_MATCH (L, R: UNSIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: terms compared per STD_LOGIC_1164 intent
-- Id: M.3
function STD_MATCH (L, R: SIGNED) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: terms compared per STD_LOGIC_1164 intent
-- Id: M.4
function STD_MATCH (L, R: STD_LOGIC_VECTOR) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: terms compared per STD_LOGIC_1164 intent
-- Id: M.5
function STD_MATCH (L, R: STD_ULOGIC_VECTOR) return BOOLEAN;
-- Result subtype: BOOLEAN
-- Result: terms compared per STD_LOGIC_1164 intent
--============================================================================
-- Translation Functions
--============================================================================
-- Id: T.1
function TO_01 (S: UNSIGNED; XMAP: STD_LOGIC := '0') return UNSIGNED;
-- Result subtype: UNSIGNED(S'RANGE)
-- Result: Termwise, 'H' is translated to '1', and 'L' is translated
-- to '0'. If a value other than '0'|'1'|'H'|'L' is found,
-- the array is set to (others => XMAP), and a warning is
-- issued.
-- Id: T.2
function TO_01 (S: SIGNED; XMAP: STD_LOGIC := '0') return SIGNED;
-- Result subtype: SIGNED(S'RANGE)
-- Result: Termwise, 'H' is translated to '1', and 'L' is translated
-- to '0'. If a value other than '0'|'1'|'H'|'L' is found,
-- the array is set to (others => XMAP), and a warning is
-- issued.
end NUMERIC_STD;
|
-- Copyright (c) 2015 CERN
-- Maciej Suminski <maciej.suminski@cern.ch>
--
-- This source code is free software; you can redistribute it
-- and/or modify it in source code form under the terms of the GNU
-- General Public License as published by the Free Software
-- Foundation; either version 2 of the License, or (at your option)
-- any later version.
--
-- This program is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-- GNU General Public License for more details.
--
-- You should have received a copy of the GNU General Public License
-- along with this program; if not, write to the Free Software
-- Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
-- Test for constant arrays access
library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
package constant_array_pkg is
type t_unsigned_array is array (natural range <>) of unsigned(7 downto 0);
constant const_array : t_unsigned_array(7 downto 0) :=
(0 => "00000010",
1 => "00001000",
2 => "00010000",
3 => "00100000",
4 => "01000000",
5 => "01111100",
others => "00000010");
end package constant_array_pkg;
|
-- Copyright (c) 2015 CERN
-- Maciej Suminski <maciej.suminski@cern.ch>
--
-- This source code is free software; you can redistribute it
-- and/or modify it in source code form under the terms of the GNU
-- General Public License as published by the Free Software
-- Foundation; either version 2 of the License, or (at your option)
-- any later version.
--
-- This program is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-- GNU General Public License for more details.
--
-- You should have received a copy of the GNU General Public License
-- along with this program; if not, write to the Free Software
-- Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
-- Test for constant arrays access
library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
package constant_array_pkg is
type t_unsigned_array is array (natural range <>) of unsigned(7 downto 0);
constant const_array : t_unsigned_array(7 downto 0) :=
(0 => "00000010",
1 => "00001000",
2 => "00010000",
3 => "00100000",
4 => "01000000",
5 => "01111100",
others => "00000010");
end package constant_array_pkg;
|
-- Copyright (c) 2015 CERN
-- Maciej Suminski <maciej.suminski@cern.ch>
--
-- This source code is free software; you can redistribute it
-- and/or modify it in source code form under the terms of the GNU
-- General Public License as published by the Free Software
-- Foundation; either version 2 of the License, or (at your option)
-- any later version.
--
-- This program is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-- GNU General Public License for more details.
--
-- You should have received a copy of the GNU General Public License
-- along with this program; if not, write to the Free Software
-- Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
-- Test for constant arrays access
library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
package constant_array_pkg is
type t_unsigned_array is array (natural range <>) of unsigned(7 downto 0);
constant const_array : t_unsigned_array(7 downto 0) :=
(0 => "00000010",
1 => "00001000",
2 => "00010000",
3 => "00100000",
4 => "01000000",
5 => "01111100",
others => "00000010");
end package constant_array_pkg;
|
--------------------------------------------------------------------------------
--
-- BLK MEM GEN v7_3 Core - Top File for the Example Testbench
--
--------------------------------------------------------------------------------
--
-- (c) Copyright 2006_3010 Xilinx, Inc. All rights reserved.
--
-- This file contains confidential and proprietary information
-- of Xilinx, Inc. and is protected under U.S. and
-- international copyright and other intellectual property
-- laws.
--
-- DISCLAIMER
-- This disclaimer is not a license and does not grant any
-- rights to the materials distributed herewith. Except as
-- otherwise provided in a valid license issued to you by
-- Xilinx, and to the maximum extent permitted by applicable
-- law: (1) THESE MATERIALS ARE MADE AVAILABLE "AS IS" AND
-- WITH ALL FAULTS, AND XILINX HEREBY DISCLAIMS ALL WARRANTIES
-- AND CONDITIONS, EXPRESS, IMPLIED, OR STATUTORY, INCLUDING
-- BUT NOT LIMITED TO WARRANTIES OF MERCHANTABILITY, NON-
-- INFRINGEMENT, OR FITNESS FOR ANY PARTICULAR PURPOSE; and
-- (2) Xilinx shall not be liable (whether in contract or tort,
-- including negligence, or under any other theory of
-- liability) for any loss or damage of any kind or nature
-- related to, arising under or in connection with these
-- materials, including for any direct, or any indirect,
-- special, incidental, or consequential loss or damage
-- (including loss of data, profits, goodwill, or any type of
-- loss or damage suffered as a result of any action brought
-- by a third party) even if such damage or loss was
-- reasonably foreseeable or Xilinx had been advised of the
-- possibility of the same.
--
-- CRITICAL APPLICATIONS
-- Xilinx products are not designed or intended to be fail-
-- safe, or for use in any application requiring fail-safe
-- performance, such as life-support or safety devices or
-- systems, Class III medical devices, nuclear facilities,
-- applications related to the deployment of airbags, or any
-- other applications that could lead to death, personal
-- injury, or severe property or environmental damage
-- (individually and collectively, "Critical
-- Applications"). Customer assumes the sole risk and
-- liability of any use of Xilinx products in Critical
-- Applications, subject only to applicable laws and
-- regulations governing limitations on product liability.
--
-- THIS COPYRIGHT NOTICE AND DISCLAIMER MUST BE RETAINED AS
-- PART OF THIS FILE AT ALL TIMES.
--------------------------------------------------------------------------------
-- Filename: mips_vram_tb.vhd
-- Description:
-- Testbench Top
--------------------------------------------------------------------------------
-- Author: IP Solutions Division
--
-- History: Sep 12, 2011 - First Release
--------------------------------------------------------------------------------
--
--------------------------------------------------------------------------------
-- Library Declarations
--------------------------------------------------------------------------------
LIBRARY IEEE;
USE IEEE.STD_LOGIC_1164.ALL;
USE IEEE.STD_LOGIC_ARITH.ALL;
USE IEEE.STD_LOGIC_UNSIGNED.ALL;
LIBRARY work;
USE work.ALL;
ENTITY mips_vram_tb IS
END ENTITY;
ARCHITECTURE mips_vram_tb_ARCH OF mips_vram_tb IS
SIGNAL STATUS : STD_LOGIC_VECTOR(8 DOWNTO 0);
SIGNAL CLK : STD_LOGIC := '1';
SIGNAL CLKB : STD_LOGIC := '1';
SIGNAL RESET : STD_LOGIC;
BEGIN
CLK_GEN: PROCESS BEGIN
CLK <= NOT CLK;
WAIT FOR 100 NS;
CLK <= NOT CLK;
WAIT FOR 100 NS;
END PROCESS;
CLKB_GEN: PROCESS BEGIN
CLKB <= NOT CLKB;
WAIT FOR 100 NS;
CLKB <= NOT CLKB;
WAIT FOR 100 NS;
END PROCESS;
RST_GEN: PROCESS BEGIN
RESET <= '1';
WAIT FOR 1000 NS;
RESET <= '0';
WAIT;
END PROCESS;
--STOP_SIM: PROCESS BEGIN
-- WAIT FOR 200 US; -- STOP SIMULATION AFTER 1 MS
-- ASSERT FALSE
-- REPORT "END SIMULATION TIME REACHED"
-- SEVERITY FAILURE;
--END PROCESS;
--
PROCESS BEGIN
WAIT UNTIL STATUS(8)='1';
IF( STATUS(7 downto 0)/="0") THEN
ASSERT false
REPORT "Test Completed Successfully"
SEVERITY NOTE;
REPORT "Simulation Failed"
SEVERITY FAILURE;
ELSE
ASSERT false
REPORT "TEST PASS"
SEVERITY NOTE;
REPORT "Test Completed Successfully"
SEVERITY FAILURE;
END IF;
END PROCESS;
mips_vram_synth_inst:ENTITY work.mips_vram_synth
PORT MAP(
CLK_IN => CLK,
CLKB_IN => CLK,
RESET_IN => RESET,
STATUS => STATUS
);
END ARCHITECTURE;
|
-- -------------------------------------------------------------
--
-- Generated Configuration for pad_pads_e
--
-- Generated
-- by: wig
-- on: Mon Jul 18 15:56:34 2005
-- cmd: h:/work/eclipse/mix/mix_0.pl -strip -nodelta ../../padio.xls
--
-- !!! Do not edit this file! Autogenerated by MIX !!!
-- $Author: wig $
-- $Id: pad_pads_e-conf-c.vhd,v 1.3 2005/07/19 07:13:11 wig Exp $
-- $Date: 2005/07/19 07:13:11 $
-- $Log: pad_pads_e-conf-c.vhd,v $
-- Revision 1.3 2005/07/19 07:13:11 wig
-- Update testcases. Added highlow/nolowbus
--
--
-- Based on Mix Entity Template built into RCSfile: MixWriter.pm,v
-- Id: MixWriter.pm,v 1.57 2005/07/18 08:58:22 wig Exp
--
-- Generator: mix_0.pl Version: Revision: 1.36 , wilfried.gaensheimer@micronas.com
-- (C) 2003 Micronas GmbH
--
-- --------------------------------------------------------------
library IEEE;
use IEEE.std_logic_1164.all;
-- No project specific VHDL libraries/conf
--
-- Start of Generated Configuration pad_pads_e_conf / pad_pads_e
--
configuration pad_pads_e_conf of pad_pads_e is
for rtl
-- Generated Configuration
for data_10_pad : w_data3
use configuration work.w_data3_conf;
end for;
for data_9_pad : w_data2
use configuration work.w_data2_conf;
end for;
for data_i1_pad : w_pad_i
use configuration work.w_pad_i_conf;
end for;
for data_i33_pad : w_pad_i
use configuration work.w_pad_i_conf;
end for;
for data_i34_pad : w_pad_i
use configuration work.w_pad_i_conf;
end for;
for data_o1_pad : w_pad_o
use configuration work.w_pad_o_conf;
end for;
for data_o35_pad : w_pad_o
use configuration work.w_pad_o_conf;
end for;
for data_o36_pad : w_pad_o
use configuration work.w_pad_o_conf;
end for;
for disp_10_pad : w_disp
use configuration work.w_disp_conf;
end for;
for disp_2_pad : w_disp
use configuration work.w_disp_conf;
end for;
for disp_3_pad : w_disp
use configuration work.w_disp_conf;
end for;
for disp_4_pad : w_disp
use configuration work.w_disp_conf;
end for;
for disp_5_pad : w_disp
use configuration work.w_disp_conf;
end for;
for disp_6_pad : w_disp
use configuration work.w_disp_conf;
end for;
for disp_7_pad : w_disp
use configuration work.w_disp_conf;
end for;
for disp_8_pad : w_disp
use configuration work.w_disp_conf;
end for;
for disp_9_pad : w_disp
use configuration work.w_disp_conf;
end for;
for osc_1_pad : w_osc
use configuration work.w_osc_conf;
end for;
for osc_2_pad : w_osc
use configuration work.w_osc_conf;
end for;
for osc_3_pad : w_osc
use configuration work.w_osc_conf;
end for;
for pad_dire_pad : w_pad_dire
use configuration work.w_pad_dire_conf;
end for;
for pad_dirli_pad : w_pad_dir
use configuration work.w_pad_dir_conf;
end for;
end for;
end pad_pads_e_conf;
--
-- End of Generated Configuration pad_pads_e_conf
--
--
--!End of Configuration/ies
-- --------------------------------------------------------------
|
library ieee;
use ieee.std_logic_1164.all;
library ieee;
use ieee.numeric_std.all;
entity extend_mask is
port (
clk : in std_logic;
ra0_addr : in std_logic_vector(4 downto 0);
ra0_data : out std_logic_vector(20 downto 0)
);
end extend_mask;
architecture augh of extend_mask is
-- Embedded RAM
type ram_type is array (0 to 19) of std_logic_vector(20 downto 0);
signal ram : ram_type := (
"111111111111111111110", "111111111111111111100", "111111111111111111000", "111111111111111110000",
"111111111111111100000", "111111111111111000000", "111111111111110000000", "111111111111100000000",
"111111111111000000000", "111111111110000000000", "111111111100000000000", "111111111000000000000",
"111111110000000000000", "111111100000000000000", "111111000000000000000", "111110000000000000000",
"111100000000000000000", "111000000000000000000", "110000000000000000000", "100000000000000000000"
);
-- Little utility functions to make VHDL syntactically correct
-- with the syntax to_integer(unsigned(vector)) when 'vector' is a std_logic.
-- This happens when accessing arrays with <= 2 cells, for example.
function to_integer(B: std_logic) return integer is
variable V: std_logic_vector(0 to 0);
begin
V(0) := B;
return to_integer(unsigned(V));
end;
function to_integer(V: std_logic_vector) return integer is
begin
return to_integer(unsigned(V));
end;
begin
-- The component is a ROM.
-- There is no Write side.
-- The Read side (the outputs)
ra0_data <= ram( to_integer(ra0_addr) ) when to_integer(ra0_addr) < 20 else (others => '-');
end architecture;
|
library ieee;
use ieee.std_logic_1164.all;
library ieee;
use ieee.numeric_std.all;
entity extend_mask is
port (
clk : in std_logic;
ra0_addr : in std_logic_vector(4 downto 0);
ra0_data : out std_logic_vector(20 downto 0)
);
end extend_mask;
architecture augh of extend_mask is
-- Embedded RAM
type ram_type is array (0 to 19) of std_logic_vector(20 downto 0);
signal ram : ram_type := (
"111111111111111111110", "111111111111111111100", "111111111111111111000", "111111111111111110000",
"111111111111111100000", "111111111111111000000", "111111111111110000000", "111111111111100000000",
"111111111111000000000", "111111111110000000000", "111111111100000000000", "111111111000000000000",
"111111110000000000000", "111111100000000000000", "111111000000000000000", "111110000000000000000",
"111100000000000000000", "111000000000000000000", "110000000000000000000", "100000000000000000000"
);
-- Little utility functions to make VHDL syntactically correct
-- with the syntax to_integer(unsigned(vector)) when 'vector' is a std_logic.
-- This happens when accessing arrays with <= 2 cells, for example.
function to_integer(B: std_logic) return integer is
variable V: std_logic_vector(0 to 0);
begin
V(0) := B;
return to_integer(unsigned(V));
end;
function to_integer(V: std_logic_vector) return integer is
begin
return to_integer(unsigned(V));
end;
begin
-- The component is a ROM.
-- There is no Write side.
-- The Read side (the outputs)
ra0_data <= ram( to_integer(ra0_addr) ) when to_integer(ra0_addr) < 20 else (others => '-');
end architecture;
|
library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
entity memory_depth_one is
port (
address: in unsigned(0 downto 0);
output: out std_logic
);
end entity;
architecture arch of memory_depth_one is
constant store: std_logic_vector(0 downto 0) := "0";
begin
output <= store(to_integer(address));
end arch;
|
entity protected1 is
end entity;
architecture test of protected1 is
type SharedCounter is protected
procedure increment (N: Integer := 1);
procedure decrement (N: Integer := 1);
impure function value return Integer;
end protected SharedCounter;
type SharedCounter is protected body
variable counter: Integer := 0;
variable dummy: Integer;
procedure increment (N: Integer := 1) is
begin
counter := counter + N;
end procedure increment;
procedure decrement (N: Integer := 1) is
begin
counter := counter - N;
end procedure decrement;
impure function value return Integer is
begin
return counter;
end function value;
end protected body;
shared variable x : SharedCounter;
begin
process is
begin
assert x.value = 0;
x.increment;
report "value is now " & integer'image(x.value);
x.increment(2);
assert x.value = 3;
wait;
end process;
process is
begin
wait for 1 ns;
assert x.value = 3;
x.decrement;
assert x.value = 2;
wait;
end process;
end architecture;
|
entity protected1 is
end entity;
architecture test of protected1 is
type SharedCounter is protected
procedure increment (N: Integer := 1);
procedure decrement (N: Integer := 1);
impure function value return Integer;
end protected SharedCounter;
type SharedCounter is protected body
variable counter: Integer := 0;
variable dummy: Integer;
procedure increment (N: Integer := 1) is
begin
counter := counter + N;
end procedure increment;
procedure decrement (N: Integer := 1) is
begin
counter := counter - N;
end procedure decrement;
impure function value return Integer is
begin
return counter;
end function value;
end protected body;
shared variable x : SharedCounter;
begin
process is
begin
assert x.value = 0;
x.increment;
report "value is now " & integer'image(x.value);
x.increment(2);
assert x.value = 3;
wait;
end process;
process is
begin
wait for 1 ns;
assert x.value = 3;
x.decrement;
assert x.value = 2;
wait;
end process;
end architecture;
|
entity protected1 is
end entity;
architecture test of protected1 is
type SharedCounter is protected
procedure increment (N: Integer := 1);
procedure decrement (N: Integer := 1);
impure function value return Integer;
end protected SharedCounter;
type SharedCounter is protected body
variable counter: Integer := 0;
variable dummy: Integer;
procedure increment (N: Integer := 1) is
begin
counter := counter + N;
end procedure increment;
procedure decrement (N: Integer := 1) is
begin
counter := counter - N;
end procedure decrement;
impure function value return Integer is
begin
return counter;
end function value;
end protected body;
shared variable x : SharedCounter;
begin
process is
begin
assert x.value = 0;
x.increment;
report "value is now " & integer'image(x.value);
x.increment(2);
assert x.value = 3;
wait;
end process;
process is
begin
wait for 1 ns;
assert x.value = 3;
x.decrement;
assert x.value = 2;
wait;
end process;
end architecture;
|
entity protected1 is
end entity;
architecture test of protected1 is
type SharedCounter is protected
procedure increment (N: Integer := 1);
procedure decrement (N: Integer := 1);
impure function value return Integer;
end protected SharedCounter;
type SharedCounter is protected body
variable counter: Integer := 0;
variable dummy: Integer;
procedure increment (N: Integer := 1) is
begin
counter := counter + N;
end procedure increment;
procedure decrement (N: Integer := 1) is
begin
counter := counter - N;
end procedure decrement;
impure function value return Integer is
begin
return counter;
end function value;
end protected body;
shared variable x : SharedCounter;
begin
process is
begin
assert x.value = 0;
x.increment;
report "value is now " & integer'image(x.value);
x.increment(2);
assert x.value = 3;
wait;
end process;
process is
begin
wait for 1 ns;
assert x.value = 3;
x.decrement;
assert x.value = 2;
wait;
end process;
end architecture;
|
entity protected1 is
end entity;
architecture test of protected1 is
type SharedCounter is protected
procedure increment (N: Integer := 1);
procedure decrement (N: Integer := 1);
impure function value return Integer;
end protected SharedCounter;
type SharedCounter is protected body
variable counter: Integer := 0;
variable dummy: Integer;
procedure increment (N: Integer := 1) is
begin
counter := counter + N;
end procedure increment;
procedure decrement (N: Integer := 1) is
begin
counter := counter - N;
end procedure decrement;
impure function value return Integer is
begin
return counter;
end function value;
end protected body;
shared variable x : SharedCounter;
begin
process is
begin
assert x.value = 0;
x.increment;
report "value is now " & integer'image(x.value);
x.increment(2);
assert x.value = 3;
wait;
end process;
process is
begin
wait for 1 ns;
assert x.value = 3;
x.decrement;
assert x.value = 2;
wait;
end process;
end architecture;
|
--------------------------------------------------------------------------------
-- LGPL v2.1, Copyright (c) 2013 Johannes Walter <johannes@wltr.io>
--
-- Description:
-- Send synchronous serial data over 3 wires.
--------------------------------------------------------------------------------
library ieee;
use ieee.std_logic_1164.all;
library work;
use work.lfsr_pkg.all;
entity serial_3wire_tx is
generic (
-- Data bit width
data_width_g : positive := 32;
-- Number of clock cycles per bit
num_ticks_g : positive := 16);
port (
-- Clock and resets
clk_i : in std_ulogic;
rst_asy_n_i : in std_ulogic;
rst_syn_i : in std_ulogic;
-- Interface
data_i : in std_ulogic_vector(data_width_g - 1 downto 0);
data_en_i : in std_ulogic;
busy_o : out std_ulogic;
done_o : out std_ulogic;
-- Transmission lines
tx_frame_o : out std_ulogic;
tx_bit_en_o : out std_ulogic;
tx_o : out std_ulogic);
end entity serial_3wire_tx;
architecture rtl of serial_3wire_tx is
------------------------------------------------------------------------------
-- Types and Constants
------------------------------------------------------------------------------
-- Using odd parity detects empty frames as errors
constant parity_init_c : std_ulogic := '1';
-- LFSR counter bit length
constant len_c : natural := lfsr_length(data_width_g + 1);
-- LFSR counter initial values
constant seed_c : std_ulogic_vector(len_c - 1 downto 0) := lfsr_seed(len_c);
-- FSM states
type state_t is (IDLE, EN_HIGH, EN_LOW);
-- FSM registers
type reg_t is record
state : state_t;
count : std_ulogic_vector(len_c - 1 downto 0);
data : std_ulogic_vector(data_width_g - 1 downto 0);
parity : std_ulogic;
frame : std_ulogic;
bit_en : std_ulogic;
done : std_ulogic;
end record reg_t;
-- FSM initial state
constant init_c : reg_t := (
state => IDLE,
count => seed_c,
data => (others => '0'),
parity => parity_init_c,
frame => '0',
bit_en => '0',
done => '0');
------------------------------------------------------------------------------
-- Internal Registers
------------------------------------------------------------------------------
signal reg : reg_t := init_c;
------------------------------------------------------------------------------
-- Internal Wires
------------------------------------------------------------------------------
signal next_reg : reg_t;
signal strobe_en : std_ulogic;
signal bit_strobe : std_ulogic;
begin -- architecture rtl
------------------------------------------------------------------------------
-- Outputs
------------------------------------------------------------------------------
busy_o <= reg.frame;
done_o <= reg.done;
tx_frame_o <= reg.frame;
tx_bit_en_o <= reg.bit_en;
tx_o <= reg.data(reg.data'low);
------------------------------------------------------------------------------
-- Instances
------------------------------------------------------------------------------
lfsr_strobe_gen_inst : entity work.lfsr_strobe_generator
generic map (
period_g => num_ticks_g / 2,
preset_value_g => 0)
port map (
clk_i => clk_i,
rst_asy_n_i => rst_asy_n_i,
rst_syn_i => rst_syn_i,
en_i => strobe_en,
pre_i => '0',
strobe_o => bit_strobe);
------------------------------------------------------------------------------
-- Registers
------------------------------------------------------------------------------
-- FSM registering
regs : process (clk_i, rst_asy_n_i) is
procedure reset is
begin
reg <= init_c;
end procedure reset;
begin -- process regs
if rst_asy_n_i = '0' then
reset;
elsif rising_edge(clk_i) then
if rst_syn_i = '1' then
reset;
else
reg <= next_reg;
end if;
end if;
end process regs;
------------------------------------------------------------------------------
-- Combinatorics
------------------------------------------------------------------------------
-- FSM combinatorics
comb : process (reg, data_i, data_en_i, bit_strobe) is
begin -- process comb
-- Defaults
next_reg <= reg;
strobe_en <= '1';
next_reg.done <= init_c.done;
case reg.state is
when IDLE =>
strobe_en <= '0';
-- Wait for data
if data_en_i = '1' then
-- Start transmission
next_reg.data <= data_i;
next_reg.frame <= '1';
next_reg.state <= EN_LOW;
end if;
when EN_LOW =>
-- Bit enable is low
if bit_strobe = '1' then
-- Set bit enable high after a specific number of clock cycles
next_reg.bit_en <= '1';
next_reg.state <= EN_HIGH;
end if;
when EN_HIGH =>
-- Bit enable is high
if bit_strobe = '1' then
if reg.count = lfsr_shift(seed_c, data_width_g) then
-- Reset if all bits were sent
next_reg <= init_c;
next_reg.done <= '1';
else
if reg.count = lfsr_shift(seed_c, data_width_g - 1) then
-- Attach parity bit at the end of every transmission
next_reg.data(next_reg.data'low) <= reg.parity xor reg.data(reg.data'low);
else
-- Calculate parity bit
next_reg.parity <= reg.parity xor reg.data(reg.data'low);
-- Transmit next data bit
next_reg.data <= '0' & reg.data(reg.data'high downto reg.data'low + 1);
end if;
next_reg.count <= lfsr_shift(reg.count);
-- Set bit enable low after a specific number of clock cycles
next_reg.bit_en <= '0';
next_reg.state <= EN_LOW;
end if;
end if;
end case;
end process comb;
end architecture rtl;
|
-- --------------------------------------------------------------------
--
-- Copyright © 2008 by IEEE. All rights reserved.
--
-- This source file is an essential part of IEEE Std 1076-2008,
-- IEEE Standard VHDL Language Reference Manual. This source file may not be
-- copied, sold, or included with software that is sold without written
-- permission from the IEEE Standards Department. This source file may be
-- copied for individual use between licensed users. This source file is
-- provided on an AS IS basis. The IEEE disclaims ANY WARRANTY EXPRESS OR
-- IMPLIED INCLUDING ANY WARRANTY OF MERCHANTABILITY AND FITNESS FOR USE
-- FOR A PARTICULAR PURPOSE. The user of the source file shall indemnify
-- and hold IEEE harmless from any damages or liability arising out of the
-- use thereof.
--
-- Title : Fixed-point package (Generic package body)
-- :
-- Library : This package shall be compiled into a library
-- : symbolically named IEEE.
-- :
-- Developers: Accellera VHDL-TC and IEEE P1076 Working Group
-- :
-- Purpose : This packages defines basic binary fixed point arithmetic
-- : arithmetic functions
-- :
-- Note : This package may be modified to include additional data
-- : required by tools, but it must in no way change the
-- : external interfaces or simulation behavior of the
-- : description. It is permissible to add comments and/or
-- : attributes to the package declarations, but not to change
-- : or delete any original lines of the package declaration.
-- : The package body may be changed only in accordance with
-- : the terms of Clause 16 of this standard.
-- :
-- --------------------------------------------------------------------
-- $Revision: 1220 $
-- $Date: 2008-04-10 17:16:09 +0930 (Thu, 10 Apr 2008) $
-- --------------------------------------------------------------------
library IEEE;
use IEEE.MATH_REAL.all;
package body fixed_generic_pkg is
-- Author David Bishop (dbishop@vhdl.org)
-- Other contributers: Jim Lewis, Yannick Grugni, Ryan W. Hilton
-- null array constants
constant NAUF : UNRESOLVED_ufixed (0 downto 1) := (others => '0');
constant NASF : UNRESOLVED_sfixed (0 downto 1) := (others => '0');
constant NSLV : STD_ULOGIC_VECTOR (0 downto 1) := (others => '0');
-- This differed constant will tell you if the package body is synthesizable
-- or implemented as real numbers, set to "true" if synthesizable.
constant fixedsynth_or_real : BOOLEAN := true;
-- Special version of "minimum" to do some boundary checking without errors
function mins (l, r : INTEGER)
return INTEGER is
begin -- function mins
if (L = INTEGER'low or R = INTEGER'low) then
return 0; -- error condition, silent
end if;
return minimum (L, R);
end function mins;
-- Special version of "minimum" to do some boundary checking with errors
function mine (l, r : INTEGER)
return INTEGER is
begin -- function mine
if (L = INTEGER'low or R = INTEGER'low) then
report fixed_generic_pkg'instance_name
& " Unbounded number passed, was a literal used?"
severity error;
return 0;
end if;
return minimum (L, R);
end function mine;
-- The following functions are used only internally. Every function
-- calls "cleanvec" either directly or indirectly.
-- purpose: Fixes "downto" problem and resolves meta states
function cleanvec (
arg : UNRESOLVED_sfixed) -- input
return UNRESOLVED_sfixed
is
constant left_index : INTEGER := maximum(arg'left, arg'right);
constant right_index : INTEGER := mins(arg'left, arg'right);
variable result : UNRESOLVED_sfixed (arg'range);
begin -- function cleanvec
assert not (arg'ascending and (arg'low /= INTEGER'low))
report fixed_generic_pkg'instance_name
& " Vector passed using a ""to"" range, expected is ""downto"""
severity error;
return arg;
end function cleanvec;
-- purpose: Fixes "downto" problem and resolves meta states
function cleanvec (
arg : UNRESOLVED_ufixed) -- input
return UNRESOLVED_ufixed
is
constant left_index : INTEGER := maximum(arg'left, arg'right);
constant right_index : INTEGER := mins(arg'left, arg'right);
variable result : UNRESOLVED_ufixed (arg'range);
begin -- function cleanvec
assert not (arg'ascending and (arg'low /= INTEGER'low))
report fixed_generic_pkg'instance_name
& " Vector passed using a ""to"" range, expected is ""downto"""
severity error;
return arg;
end function cleanvec;
-- Type convert a "unsigned" into a "ufixed", used internally
function to_fixed (
arg : UNRESOLVED_UNSIGNED; -- shifted vector
constant left_index : INTEGER;
constant right_index : INTEGER)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (left_index downto right_index);
begin -- function to_fixed
result := UNRESOLVED_ufixed(arg);
return result;
end function to_fixed;
-- Type convert a "signed" into an "sfixed", used internally
function to_fixed (
arg : UNRESOLVED_SIGNED; -- shifted vector
constant left_index : INTEGER;
constant right_index : INTEGER)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (left_index downto right_index);
begin -- function to_fixed
result := UNRESOLVED_sfixed(arg);
return result;
end function to_fixed;
-- Type convert a "ufixed" into an "unsigned", used internally
function to_uns (
arg : UNRESOLVED_ufixed) -- fp vector
return UNRESOLVED_UNSIGNED
is
subtype t is UNRESOLVED_UNSIGNED(arg'high - arg'low downto 0);
variable slv : t;
begin -- function to_uns
slv := t(arg);
return slv;
end function to_uns;
-- Type convert an "sfixed" into a "signed", used internally
function to_s (
arg : UNRESOLVED_sfixed) -- fp vector
return UNRESOLVED_SIGNED
is
subtype t is UNRESOLVED_SIGNED(arg'high - arg'low downto 0);
variable slv : t;
begin -- function to_s
slv := t(arg);
return slv;
end function to_s;
-- adds 1 to the LSB of the number
procedure round_up (arg : in UNRESOLVED_ufixed;
result : out UNRESOLVED_ufixed;
overflowx : out BOOLEAN) is
variable arguns, resuns : UNRESOLVED_UNSIGNED (arg'high-arg'low+1 downto 0)
:= (others => '0');
begin -- round_up
arguns (arguns'high-1 downto 0) := to_uns (arg);
resuns := arguns + 1;
result := to_fixed(resuns(arg'high-arg'low
downto 0), arg'high, arg'low);
overflowx := (resuns(resuns'high) = '1');
end procedure round_up;
-- adds 1 to the LSB of the number
procedure round_up (arg : in UNRESOLVED_sfixed;
result : out UNRESOLVED_sfixed;
overflowx : out BOOLEAN) is
variable args, ress : UNRESOLVED_SIGNED (arg'high-arg'low+1 downto 0);
begin -- round_up
args (args'high-1 downto 0) := to_s (arg);
args(args'high) := arg(arg'high); -- sign extend
ress := args + 1;
result := to_fixed(ress (ress'high-1
downto 0), arg'high, arg'low);
overflowx := ((arg(arg'high) /= ress(ress'high-1))
and (or (STD_ULOGIC_VECTOR(ress)) /= '0'));
end procedure round_up;
-- Rounding - Performs a "round_nearest" (IEEE 754) which rounds up
-- when the remainder is > 0.5. If the remainder IS 0.5 then if the
-- bottom bit is a "1" it is rounded, otherwise it remains the same.
function round_fixed (arg : UNRESOLVED_ufixed;
remainder : UNRESOLVED_ufixed;
overflow_style : fixed_overflow_style_type := fixed_overflow_style)
return UNRESOLVED_ufixed
is
variable rounds : BOOLEAN;
variable round_overflow : BOOLEAN;
variable result : UNRESOLVED_ufixed (arg'range);
begin
rounds := false;
if (remainder'length > 1) then
if (remainder (remainder'high) = '1') then
rounds := (arg(arg'low) = '1')
or (or (to_sulv(remainder(remainder'high-1 downto
remainder'low))) = '1');
end if;
else
rounds := (arg(arg'low) = '1') and (remainder (remainder'high) = '1');
end if;
if rounds then
round_up(arg => arg,
result => result,
overflowx => round_overflow);
else
result := arg;
end if;
if (overflow_style = fixed_saturate) and round_overflow then
result := saturate (result'high, result'low);
end if;
return result;
end function round_fixed;
-- Rounding case statement
function round_fixed (arg : UNRESOLVED_sfixed;
remainder : UNRESOLVED_sfixed;
overflow_style : fixed_overflow_style_type := fixed_overflow_style)
return UNRESOLVED_sfixed
is
variable rounds : BOOLEAN;
variable round_overflow : BOOLEAN;
variable result : UNRESOLVED_sfixed (arg'range);
begin
rounds := false;
if (remainder'length > 1) then
if (remainder (remainder'high) = '1') then
rounds := (arg(arg'low) = '1')
or (or (to_sulv(remainder(remainder'high-1 downto
remainder'low))) = '1');
end if;
else
rounds := (arg(arg'low) = '1') and (remainder (remainder'high) = '1');
end if;
if rounds then
round_up(arg => arg,
result => result,
overflowx => round_overflow);
else
result := arg;
end if;
if round_overflow then
if (overflow_style = fixed_saturate) then
if arg(arg'high) = '0' then
result := saturate (result'high, result'low);
else
result := not saturate (result'high, result'low);
end if;
-- Sign bit not fixed when wrapping
end if;
end if;
return result;
end function round_fixed;
-- converts an sfixed into a ufixed. The output is the same length as the
-- input, because abs("1000") = "1000" = 8.
function to_ufixed (
arg : UNRESOLVED_sfixed)
return UNRESOLVED_ufixed
is
constant left_index : INTEGER := arg'high;
constant right_index : INTEGER := mine(arg'low, arg'low);
variable xarg : UNRESOLVED_sfixed(left_index+1 downto right_index);
variable result : UNRESOLVED_ufixed(left_index downto right_index);
begin
if arg'length < 1 then
return NAUF;
end if;
xarg := abs(arg);
result := UNRESOLVED_ufixed (xarg (left_index downto right_index));
return result;
end function to_ufixed;
-----------------------------------------------------------------------------
-- Visible functions
-----------------------------------------------------------------------------
-- Conversion functions. These are needed for synthesis where typically
-- the only input and output type is a std_logic_vector.
function to_sulv (
arg : UNRESOLVED_ufixed) -- fixed point vector
return STD_ULOGIC_VECTOR
is
subtype result_subtype is STD_ULOGIC_VECTOR (arg'length-1 downto 0);
variable result : result_subtype;
begin
if arg'length < 1 then
return NSLV;
end if;
result := result_subtype (arg);
return result;
end function to_sulv;
function to_sulv (
arg : UNRESOLVED_sfixed) -- fixed point vector
return STD_ULOGIC_VECTOR
is
subtype result_subtype is STD_ULOGIC_VECTOR (arg'length-1 downto 0);
variable result : result_subtype;
--variable result : STD_ULOGIC_VECTOR (arg'length-1 downto 0);
begin
if arg'length < 1 then
return NSLV;
end if;
--result := STD_ULOGIC_VECTOR (arg);
result := result_subtype (arg);
return result;
end function to_sulv;
function to_slv (
arg : UNRESOLVED_ufixed) -- fixed point vector
return STD_LOGIC_VECTOR is
begin
return to_sulv(arg);
end function to_slv;
function to_slv (
arg : UNRESOLVED_sfixed) -- fixed point vector
return STD_LOGIC_VECTOR is
begin
return to_sulv(arg);
end function to_slv;
function to_ufixed (
arg : STD_ULOGIC_VECTOR; -- shifted vector
constant left_index : INTEGER;
constant right_index : INTEGER)
return unresolved_ufixed
is
variable result : UNRESOLVED_ufixed (left_index downto right_index);
begin
if (arg'length < 1 or right_index > left_index) then
return NAUF;
end if;
if (arg'length /= result'length) then
report fixed_generic_pkg'instance_name & "TO_UFIXED(SLV) "
& "Vector lengths do not match. Input length is "
& INTEGER'image(arg'length) & " and output will be "
& INTEGER'image(result'length) & " wide."
severity error;
return NAUF;
else
result := to_fixed (arg => UNRESOLVED_UNSIGNED(arg),
left_index => left_index,
right_index => right_index);
return result;
end if;
end function to_ufixed;
function to_sfixed (
arg : STD_ULOGIC_VECTOR; -- shifted vector
constant left_index : INTEGER;
constant right_index : INTEGER)
return unresolved_sfixed
is
variable result : UNRESOLVED_sfixed (left_index downto right_index);
begin
if (arg'length < 1 or right_index > left_index) then
return NASF;
end if;
if (arg'length /= result'length) then
report fixed_generic_pkg'instance_name & "TO_SFIXED(SLV) "
& "Vector lengths do not match. Input length is "
& INTEGER'image(arg'length) & " and output will be "
& INTEGER'image(result'length) & " wide."
severity error;
return NASF;
else
result := to_fixed (arg => UNRESOLVED_SIGNED(arg),
left_index => left_index,
right_index => right_index);
return result;
end if;
end function to_sfixed;
-- Two's complement number, Grows the vector by 1 bit.
-- because "abs (1000.000) = 01000.000" or abs(-16) = 16.
function "abs" (
arg : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed
is
constant left_index : INTEGER := arg'high;
constant right_index : INTEGER := mine(arg'low, arg'low);
variable ressns : UNRESOLVED_SIGNED (arg'length downto 0);
variable result : UNRESOLVED_sfixed (left_index+1 downto right_index);
begin
if (arg'length < 1 or result'length < 1) then
return NASF;
end if;
ressns (arg'length-1 downto 0) := to_s (cleanvec (arg));
ressns (arg'length) := ressns (arg'length-1); -- expand sign bit
result := to_fixed (abs(ressns), left_index+1, right_index);
return result;
end function "abs";
-- also grows the vector by 1 bit.
function "-" (
arg : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed
is
constant left_index : INTEGER := arg'high+1;
constant right_index : INTEGER := mine(arg'low, arg'low);
variable ressns : UNRESOLVED_SIGNED (arg'length downto 0);
variable result : UNRESOLVED_sfixed (left_index downto right_index);
begin
if (arg'length < 1 or result'length < 1) then
return NASF;
end if;
ressns (arg'length-1 downto 0) := to_s (cleanvec(arg));
ressns (arg'length) := ressns (arg'length-1); -- expand sign bit
result := to_fixed (-ressns, left_index, right_index);
return result;
end function "-";
-- Addition
function "+" (
l, r : UNRESOLVED_ufixed) -- ufixed(a downto b) + ufixed(c downto d) =
return UNRESOLVED_ufixed -- ufixed(max(a,c)+1 downto min(b,d))
is
constant left_index : INTEGER := maximum(l'high, r'high)+1;
constant right_index : INTEGER := mine(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
variable result : UNRESOLVED_ufixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_UNSIGNED (left_index-right_index
downto 0);
variable result_slv : UNRESOLVED_UNSIGNED (left_index-right_index
downto 0);
begin
if (l'length < 1 or r'length < 1 or result'length < 1) then
return NAUF;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_uns (lresize);
rslv := to_uns (rresize);
result_slv := lslv + rslv;
result := to_fixed(result_slv, left_index, right_index);
return result;
end function "+";
function "+" (
l, r : UNRESOLVED_sfixed) -- sfixed(a downto b) + sfixed(c downto d) =
return UNRESOLVED_sfixed -- sfixed(max(a,c)+1 downto min(b,d))
is
constant left_index : INTEGER := maximum(l'high, r'high)+1;
constant right_index : INTEGER := mine(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
variable result : UNRESOLVED_sfixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_SIGNED (left_index-right_index downto 0);
variable result_slv : UNRESOLVED_SIGNED (left_index-right_index downto 0);
begin
if (l'length < 1 or r'length < 1 or result'length < 1) then
return NASF;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_s (lresize);
rslv := to_s (rresize);
result_slv := lslv + rslv;
result := to_fixed(result_slv, left_index, right_index);
return result;
end function "+";
-- Subtraction
function "-" (
l, r : UNRESOLVED_ufixed) -- ufixed(a downto b) - ufixed(c downto d) =
return UNRESOLVED_ufixed -- ufixed(max(a,c)+1 downto min(b,d))
is
constant left_index : INTEGER := maximum(l'high, r'high)+1;
constant right_index : INTEGER := mine(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
variable result : UNRESOLVED_ufixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_UNSIGNED (left_index-right_index
downto 0);
variable result_slv : UNRESOLVED_UNSIGNED (left_index-right_index
downto 0);
begin
if (l'length < 1 or r'length < 1 or result'length < 1) then
return NAUF;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_uns (lresize);
rslv := to_uns (rresize);
result_slv := lslv - rslv;
result := to_fixed(result_slv, left_index, right_index);
return result;
end function "-";
function "-" (
l, r : UNRESOLVED_sfixed) -- sfixed(a downto b) - sfixed(c downto d) =
return UNRESOLVED_sfixed -- sfixed(max(a,c)+1 downto min(b,d))
is
constant left_index : INTEGER := maximum(l'high, r'high)+1;
constant right_index : INTEGER := mine(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
variable result : UNRESOLVED_sfixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_SIGNED (left_index-right_index downto 0);
variable result_slv : UNRESOLVED_SIGNED (left_index-right_index downto 0);
begin
if (l'length < 1 or r'length < 1 or result'length < 1) then
return NASF;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_s (lresize);
rslv := to_s (rresize);
result_slv := lslv - rslv;
result := to_fixed(result_slv, left_index, right_index);
return result;
end function "-";
function "*" (
l, r : UNRESOLVED_ufixed) -- ufixed(a downto b) * ufixed(c downto d) =
return UNRESOLVED_ufixed -- ufixed(a+c+1 downto b+d)
is
variable lslv : UNRESOLVED_UNSIGNED (l'length-1 downto 0);
variable rslv : UNRESOLVED_UNSIGNED (r'length-1 downto 0);
variable result_slv : UNRESOLVED_UNSIGNED (r'length+l'length-1 downto 0);
variable result : UNRESOLVED_ufixed (l'high + r'high+1 downto
mine(l'low, l'low) + mine(r'low, r'low));
begin
if (l'length < 1 or r'length < 1 or
result'length /= result_slv'length) then
return NAUF;
end if;
lslv := to_uns (cleanvec(l));
rslv := to_uns (cleanvec(r));
result_slv := lslv * rslv;
result := to_fixed (result_slv, result'high, result'low);
return result;
end function "*";
function "*" (
l, r : UNRESOLVED_sfixed) -- sfixed(a downto b) * sfixed(c downto d) =
return UNRESOLVED_sfixed -- sfixed(a+c+1 downto b+d)
is
variable lslv : UNRESOLVED_SIGNED (l'length-1 downto 0);
variable rslv : UNRESOLVED_SIGNED (r'length-1 downto 0);
variable result_slv : UNRESOLVED_SIGNED (r'length+l'length-1 downto 0);
variable result : UNRESOLVED_sfixed (l'high + r'high+1 downto
mine(l'low, l'low) + mine(r'low, r'low));
begin
if (l'length < 1 or r'length < 1 or
result'length /= result_slv'length) then
return NASF;
end if;
lslv := to_s (cleanvec(l));
rslv := to_s (cleanvec(r));
result_slv := lslv * rslv;
result := to_fixed (result_slv, result'high, result'low);
return result;
end function "*";
function "/" (
l, r : UNRESOLVED_ufixed) -- ufixed(a downto b) / ufixed(c downto d) =
return UNRESOLVED_ufixed is -- ufixed(a-d downto b-c-1)
begin
return divide (l, r);
end function "/";
function "/" (
l, r : UNRESOLVED_sfixed) -- sfixed(a downto b) / sfixed(c downto d) =
return UNRESOLVED_sfixed is -- sfixed(a-d+1 downto b-c)
begin
return divide (l, r);
end function "/";
-- This version of divide gives the user more control
-- ufixed(a downto b) / ufixed(c downto d) = ufixed(a-d downto b-c-1)
function divide (
l, r : UNRESOLVED_ufixed;
constant round_style : fixed_round_style_type := fixed_round_style;
constant guard_bits : NATURAL := fixed_guard_bits)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (l'high - mine(r'low, r'low) downto
mine (l'low, l'low) - r'high -1);
variable dresult : UNRESOLVED_ufixed (result'high downto result'low -guard_bits);
variable lresize : UNRESOLVED_ufixed (l'high downto l'high - dresult'length+1);
variable lslv : UNRESOLVED_UNSIGNED (lresize'length-1 downto 0);
variable rslv : UNRESOLVED_UNSIGNED (r'length-1 downto 0);
variable result_slv : UNRESOLVED_UNSIGNED (lresize'length-1 downto 0);
begin
if (l'length < 1 or r'length < 1 or
mins(r'low, r'low) /= r'low or mins(l'low, l'low) /= l'low) then
return NAUF;
end if;
lresize := resize (arg => l,
left_index => lresize'high,
right_index => lresize'low,
overflow_style => fixed_wrap, -- vector only grows
round_style => fixed_truncate);
lslv := to_uns (cleanvec (lresize));
rslv := to_uns (cleanvec (r));
if (rslv = 0) then
report fixed_generic_pkg'instance_name
& "DIVIDE(ufixed) Division by zero" severity error;
result := saturate (result'high, result'low); -- saturate
else
result_slv := lslv / rslv;
dresult := to_fixed (result_slv, dresult'high, dresult'low);
result := resize (arg => dresult,
left_index => result'high,
right_index => result'low,
overflow_style => fixed_wrap, -- overflow impossible
round_style => round_style);
end if;
return result;
end function divide;
-- sfixed(a downto b) / sfixed(c downto d) = sfixed(a-d+1 downto b-c)
function divide (
l, r : UNRESOLVED_sfixed;
constant round_style : fixed_round_style_type := fixed_round_style;
constant guard_bits : NATURAL := fixed_guard_bits)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (l'high - mine(r'low, r'low) + 1 downto
mine (l'low, l'low) - r'high);
variable dresult : UNRESOLVED_sfixed (result'high downto result'low-guard_bits);
variable lresize : UNRESOLVED_sfixed (l'high+1 downto l'high+1 -dresult'length+1);
variable lslv : UNRESOLVED_SIGNED (lresize'length-1 downto 0);
variable rslv : UNRESOLVED_SIGNED (r'length-1 downto 0);
variable result_slv : UNRESOLVED_SIGNED (lresize'length-1 downto 0);
begin
if (l'length < 1 or r'length < 1 or
mins(r'low, r'low) /= r'low or mins(l'low, l'low) /= l'low) then
return NASF;
end if;
lresize := resize (arg => l,
left_index => lresize'high,
right_index => lresize'low,
overflow_style => fixed_wrap, -- vector only grows
round_style => fixed_truncate);
lslv := to_s (cleanvec (lresize));
rslv := to_s (cleanvec (r));
if (rslv = 0) then
report fixed_generic_pkg'instance_name
& "DIVIDE(sfixed) Division by zero" severity error;
result := saturate (result'high, result'low);
else
result_slv := lslv / rslv;
dresult := to_fixed (result_slv, dresult'high, dresult'low);
result := resize (arg => dresult,
left_index => result'high,
right_index => result'low,
overflow_style => fixed_wrap, -- overflow impossible
round_style => round_style);
end if;
return result;
end function divide;
-- 1 / ufixed(a downto b) = ufixed(-b downto -a-1)
function reciprocal (
arg : UNRESOLVED_ufixed; -- fixed point input
constant round_style : fixed_round_style_type := fixed_round_style;
constant guard_bits : NATURAL := fixed_guard_bits)
return UNRESOLVED_ufixed
is
constant one : UNRESOLVED_ufixed (0 downto 0) := "1";
begin
return divide (l => one,
r => arg,
round_style => round_style,
guard_bits => guard_bits);
end function reciprocal;
-- 1 / sfixed(a downto b) = sfixed(-b+1 downto -a)
function reciprocal (
arg : UNRESOLVED_sfixed; -- fixed point input
constant round_style : fixed_round_style_type := fixed_round_style;
constant guard_bits : NATURAL := fixed_guard_bits)
return UNRESOLVED_sfixed
is
constant one : UNRESOLVED_sfixed (1 downto 0) := "01"; -- extra bit.
variable resultx : UNRESOLVED_sfixed (-mine(arg'low, arg'low)+2 downto -arg'high);
begin
if (arg'length < 1 or resultx'length < 1) then
return NASF;
else
resultx := divide (l => one,
r => arg,
round_style => round_style,
guard_bits => guard_bits);
return resultx (resultx'high-1 downto resultx'low); -- remove extra bit
end if;
end function reciprocal;
-- ufixed (a downto b) rem ufixed (c downto d)
-- = ufixed (min(a,c) downto min(b,d))
function "rem" (
l, r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return remainder (l, r);
end function "rem";
-- remainder
-- sfixed (a downto b) rem sfixed (c downto d)
-- = sfixed (min(a,c) downto min(b,d))
function "rem" (
l, r : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed is
begin
return remainder (l, r);
end function "rem";
-- ufixed (a downto b) rem ufixed (c downto d)
-- = ufixed (min(a,c) downto min(b,d))
function remainder (
l, r : UNRESOLVED_ufixed; -- fixed point input
constant round_style : fixed_round_style_type := fixed_round_style;
constant guard_bits : NATURAL := fixed_guard_bits)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (minimum(l'high, r'high) downto
mine(l'low, r'low));
constant rlow : integer := mins(r'low, r'low);
variable lresize : UNRESOLVED_ufixed (maximum(l'high, r'low) downto
rlow-guard_bits);
variable rresize : UNRESOLVED_ufixed (r'high downto rlow-guard_bits);
variable dresult : UNRESOLVED_ufixed (rresize'range);
variable lslv : UNRESOLVED_UNSIGNED (lresize'length-1 downto 0);
variable rslv : UNRESOLVED_UNSIGNED (rresize'length-1 downto 0);
variable result_slv : UNRESOLVED_UNSIGNED (rslv'range);
begin
if (l'length < 1 or r'length < 1 or
mins(r'low, r'low) /= r'low or mins(l'low, l'low) /= l'low) then
return NAUF;
end if;
lresize := resize (arg => l,
left_index => lresize'high,
right_index => lresize'low,
overflow_style => fixed_wrap, -- vector only grows
round_style => fixed_truncate);
lslv := to_uns (lresize);
rresize := resize (arg => r,
left_index => rresize'high,
right_index => rresize'low,
overflow_style => fixed_wrap, -- vector only grows
round_style => fixed_truncate);
rslv := to_uns (rresize);
if (rslv = 0) then
report fixed_generic_pkg'instance_name
& "remainder(ufixed) Division by zero" severity error;
result := saturate (result'high, result'low); -- saturate
else
if (r'low <= l'high) then
result_slv := lslv rem rslv;
dresult := to_fixed (result_slv, dresult'high, dresult'low);
result := resize (arg => dresult,
left_index => result'high,
right_index => result'low,
overflow_style => fixed_wrap, -- can't overflow
round_style => round_style);
end if;
if l'low < r'low then
result(mins(r'low-1, l'high) downto l'low) :=
cleanvec(l(mins(r'low-1, l'high) downto l'low));
end if;
end if;
return result;
end function remainder;
-- remainder
-- sfixed (a downto b) rem sfixed (c downto d)
-- = sfixed (min(a,c) downto min(b,d))
function remainder (
l, r : UNRESOLVED_sfixed; -- fixed point input
constant round_style : fixed_round_style_type := fixed_round_style;
constant guard_bits : NATURAL := fixed_guard_bits)
return UNRESOLVED_sfixed
is
variable l_abs : UNRESOLVED_ufixed (l'range);
variable r_abs : UNRESOLVED_ufixed (r'range);
variable result : UNRESOLVED_sfixed (minimum(r'high, l'high) downto
mine(r'low, l'low));
variable neg_result : UNRESOLVED_sfixed (minimum(r'high, l'high)+1 downto
mins(r'low, l'low));
begin
if (l'length < 1 or r'length < 1 or
mins(r'low, r'low) /= r'low or mins(l'low, l'low) /= l'low) then
return NASF;
end if;
l_abs := to_ufixed (l);
r_abs := to_ufixed (r);
result := UNRESOLVED_sfixed (remainder (
l => l_abs,
r => r_abs,
round_style => round_style));
neg_result := -result;
if l(l'high) = '1' then
result := neg_result(result'range);
end if;
return result;
end function remainder;
-- modulo
-- ufixed (a downto b) mod ufixed (c downto d)
-- = ufixed (min(a,c) downto min(b, d))
function "mod" (
l, r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return modulo (l, r);
end function "mod";
-- sfixed (a downto b) mod sfixed (c downto d)
-- = sfixed (c downto min(b, d))
function "mod" (
l, r : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed is
begin
return modulo(l, r);
end function "mod";
-- modulo
-- ufixed (a downto b) mod ufixed (c downto d)
-- = ufixed (min(a,c) downto min(b, d))
function modulo (
l, r : UNRESOLVED_ufixed; -- fixed point input
constant round_style : fixed_round_style_type := fixed_round_style;
constant guard_bits : NATURAL := fixed_guard_bits)
return UNRESOLVED_ufixed is
begin
return remainder(l => l,
r => r,
round_style => round_style,
guard_bits => guard_bits);
end function modulo;
-- sfixed (a downto b) mod sfixed (c downto d)
-- = sfixed (c downto min(b, d))
function modulo (
l, r : UNRESOLVED_sfixed; -- fixed point input
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style;
constant guard_bits : NATURAL := fixed_guard_bits)
return UNRESOLVED_sfixed
is
variable l_abs : UNRESOLVED_ufixed (l'range);
variable r_abs : UNRESOLVED_ufixed (r'range);
variable result : UNRESOLVED_sfixed (r'high downto
mine(r'low, l'low));
variable dresult : UNRESOLVED_sfixed (minimum(r'high, l'high)+1 downto
mins(r'low, l'low));
variable dresult_not_zero : BOOLEAN;
begin
if (l'length < 1 or r'length < 1 or
mins(r'low, r'low) /= r'low or mins(l'low, l'low) /= l'low) then
return NASF;
end if;
l_abs := to_ufixed (l);
r_abs := to_ufixed (r);
dresult := "0" & UNRESOLVED_sfixed(remainder (l => l_abs,
r => r_abs,
round_style => round_style));
if (to_s(dresult) = 0) then
dresult_not_zero := false;
else
dresult_not_zero := true;
end if;
if to_x01(l(l'high)) = '1' and to_x01(r(r'high)) = '0'
and dresult_not_zero then
result := resize (arg => r - dresult,
left_index => result'high,
right_index => result'low,
overflow_style => overflow_style,
round_style => round_style);
elsif to_x01(l(l'high)) = '1' and to_x01(r(r'high)) = '1' then
result := resize (arg => -dresult,
left_index => result'high,
right_index => result'low,
overflow_style => overflow_style,
round_style => round_style);
elsif to_x01(l(l'high)) = '0' and to_x01(r(r'high)) = '1'
and dresult_not_zero then
result := resize (arg => dresult + r,
left_index => result'high,
right_index => result'low,
overflow_style => overflow_style,
round_style => round_style);
else
result := resize (arg => dresult,
left_index => result'high,
right_index => result'low,
overflow_style => overflow_style,
round_style => round_style);
end if;
return result;
end function modulo;
-- Procedure for those who need an "accumulator" function
procedure add_carry (
L, R : in UNRESOLVED_ufixed;
c_in : in STD_ULOGIC;
result : out UNRESOLVED_ufixed;
c_out : out STD_ULOGIC) is
constant left_index : INTEGER := maximum(l'high, r'high)+1;
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_UNSIGNED (left_index-right_index
downto 0);
variable result_slv : UNRESOLVED_UNSIGNED (left_index-right_index
downto 0);
variable cx : UNRESOLVED_UNSIGNED (0 downto 0); -- Carry in
begin
if (l'length < 1 or r'length < 1) then
result := NAUF;
c_out := '0';
else
cx (0) := c_in;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_uns (lresize);
rslv := to_uns (rresize);
result_slv := lslv + rslv + cx;
c_out := result_slv(left_index);
result := to_fixed(result_slv (left_index-right_index-1 downto 0),
left_index-1, right_index);
end if;
end procedure add_carry;
procedure add_carry (
L, R : in UNRESOLVED_sfixed;
c_in : in STD_ULOGIC;
result : out UNRESOLVED_sfixed;
c_out : out STD_ULOGIC) is
constant left_index : INTEGER := maximum(l'high, r'high)+1;
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_SIGNED (left_index-right_index
downto 0);
variable result_slv : UNRESOLVED_SIGNED (left_index-right_index
downto 0);
variable cx : UNRESOLVED_SIGNED (1 downto 0); -- Carry in
begin
if (l'length < 1 or r'length < 1) then
result := NASF;
c_out := '0';
else
cx (1) := '0';
cx (0) := c_in;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_s (lresize);
rslv := to_s (rresize);
result_slv := lslv + rslv + cx;
c_out := result_slv(left_index);
result := to_fixed(result_slv (left_index-right_index-1 downto 0),
left_index-1, right_index);
end if;
end procedure add_carry;
-- Scales the result by a power of 2. Width of input = width of output with
-- the decimal point moved.
function scalb (y : UNRESOLVED_ufixed; N : INTEGER)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (y'high+N downto y'low+N);
begin
if y'length < 1 then
return NAUF;
else
result := y;
return result;
end if;
end function scalb;
function scalb (y : UNRESOLVED_ufixed; N : UNRESOLVED_SIGNED)
return UNRESOLVED_ufixed is
begin
return scalb (y => y,
N => to_integer(N));
end function scalb;
function scalb (y : UNRESOLVED_sfixed; N : INTEGER)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (y'high+N downto y'low+N);
begin
if y'length < 1 then
return NASF;
else
result := y;
return result;
end if;
end function scalb;
function scalb (y : UNRESOLVED_sfixed; N : UNRESOLVED_SIGNED)
return UNRESOLVED_sfixed is
begin
return scalb (y => y,
N => to_integer(N));
end function scalb;
function Is_Negative (arg : UNRESOLVED_sfixed) return BOOLEAN is
begin
if to_X01(arg(arg'high)) = '1' then
return true;
else
return false;
end if;
end function Is_Negative;
function find_rightmost (arg : UNRESOLVED_ufixed; y : STD_ULOGIC)
return INTEGER is
begin
for_loop : for i in arg'reverse_range loop
if arg(i) ?= y then
return i;
end if;
end loop;
return arg'high+1; -- return out of bounds 'high
end function find_rightmost;
function find_leftmost (arg : UNRESOLVED_ufixed; y : STD_ULOGIC)
return INTEGER is
begin
for_loop : for i in arg'range loop
if arg(i) ?= y then
return i;
end if;
end loop;
return arg'low-1; -- return out of bounds 'low
end function find_leftmost;
function find_rightmost (arg : UNRESOLVED_sfixed; y : STD_ULOGIC)
return INTEGER is
begin
for_loop : for i in arg'reverse_range loop
if arg(i) ?= y then
return i;
end if;
end loop;
return arg'high+1; -- return out of bounds 'high
end function find_rightmost;
function find_leftmost (arg : UNRESOLVED_sfixed; y : STD_ULOGIC)
return INTEGER is
begin
for_loop : for i in arg'range loop
if arg(i) ?= y then
return i;
end if;
end loop;
return arg'low-1; -- return out of bounds 'low
end function find_leftmost;
function "sll" (ARG : UNRESOLVED_ufixed; COUNT : INTEGER)
return UNRESOLVED_ufixed
is
variable argslv : UNRESOLVED_UNSIGNED (arg'length-1 downto 0);
variable result : UNRESOLVED_ufixed (arg'range);
begin
argslv := to_uns (arg);
argslv := argslv sll COUNT;
result := to_fixed (argslv, result'high, result'low);
return result;
end function "sll";
function "srl" (ARG : UNRESOLVED_ufixed; COUNT : INTEGER)
return UNRESOLVED_ufixed
is
variable argslv : UNRESOLVED_UNSIGNED (arg'length-1 downto 0);
variable result : UNRESOLVED_ufixed (arg'range);
begin
argslv := to_uns (arg);
argslv := argslv srl COUNT;
result := to_fixed (argslv, result'high, result'low);
return result;
end function "srl";
function "rol" (ARG : UNRESOLVED_ufixed; COUNT : INTEGER)
return UNRESOLVED_ufixed
is
variable argslv : UNRESOLVED_UNSIGNED (arg'length-1 downto 0);
variable result : UNRESOLVED_ufixed (arg'range);
begin
argslv := to_uns (arg);
argslv := argslv rol COUNT;
result := to_fixed (argslv, result'high, result'low);
return result;
end function "rol";
function "ror" (ARG : UNRESOLVED_ufixed; COUNT : INTEGER)
return UNRESOLVED_ufixed
is
variable argslv : UNRESOLVED_UNSIGNED (arg'length-1 downto 0);
variable result : UNRESOLVED_ufixed (arg'range);
begin
argslv := to_uns (arg);
argslv := argslv ror COUNT;
result := to_fixed (argslv, result'high, result'low);
return result;
end function "ror";
function "sla" (ARG : UNRESOLVED_ufixed; COUNT : INTEGER)
return UNRESOLVED_ufixed
is
variable argslv : UNRESOLVED_UNSIGNED (arg'length-1 downto 0);
variable result : UNRESOLVED_ufixed (arg'range);
begin
argslv := to_uns (arg);
-- Arithmetic shift on an unsigned is a logical shift
argslv := argslv sll COUNT;
result := to_fixed (argslv, result'high, result'low);
return result;
end function "sla";
function "sra" (ARG : UNRESOLVED_ufixed; COUNT : INTEGER)
return UNRESOLVED_ufixed
is
variable argslv : UNRESOLVED_UNSIGNED (arg'length-1 downto 0);
variable result : UNRESOLVED_ufixed (arg'range);
begin
argslv := to_uns (arg);
-- Arithmetic shift on an unsigned is a logical shift
argslv := argslv srl COUNT;
result := to_fixed (argslv, result'high, result'low);
return result;
end function "sra";
function "sll" (ARG : UNRESOLVED_sfixed; COUNT : INTEGER)
return UNRESOLVED_sfixed
is
variable argslv : UNRESOLVED_SIGNED (arg'length-1 downto 0);
variable result : UNRESOLVED_sfixed (arg'range);
begin
argslv := to_s (arg);
argslv := argslv sll COUNT;
result := to_fixed (argslv, result'high, result'low);
return result;
end function "sll";
function "srl" (ARG : UNRESOLVED_sfixed; COUNT : INTEGER)
return UNRESOLVED_sfixed
is
variable argslv : UNRESOLVED_SIGNED (arg'length-1 downto 0);
variable result : UNRESOLVED_sfixed (arg'range);
begin
argslv := to_s (arg);
argslv := argslv srl COUNT;
result := to_fixed (argslv, result'high, result'low);
return result;
end function "srl";
function "rol" (ARG : UNRESOLVED_sfixed; COUNT : INTEGER)
return UNRESOLVED_sfixed
is
variable argslv : UNRESOLVED_SIGNED (arg'length-1 downto 0);
variable result : UNRESOLVED_sfixed (arg'range);
begin
argslv := to_s (arg);
argslv := argslv rol COUNT;
result := to_fixed (argslv, result'high, result'low);
return result;
end function "rol";
function "ror" (ARG : UNRESOLVED_sfixed; COUNT : INTEGER)
return UNRESOLVED_sfixed
is
variable argslv : UNRESOLVED_SIGNED (arg'length-1 downto 0);
variable result : UNRESOLVED_sfixed (arg'range);
begin
argslv := to_s (arg);
argslv := argslv ror COUNT;
result := to_fixed (argslv, result'high, result'low);
return result;
end function "ror";
function "sla" (ARG : UNRESOLVED_sfixed; COUNT : INTEGER)
return UNRESOLVED_sfixed
is
variable argslv : UNRESOLVED_SIGNED (arg'length-1 downto 0);
variable result : UNRESOLVED_sfixed (arg'range);
begin
argslv := to_s (arg);
if COUNT > 0 then
-- Arithmetic shift left on a 2's complement number is a logic shift
argslv := argslv sll COUNT;
else
argslv := argslv sra -COUNT;
end if;
result := to_fixed (argslv, result'high, result'low);
return result;
end function "sla";
function "sra" (ARG : UNRESOLVED_sfixed; COUNT : INTEGER)
return UNRESOLVED_sfixed
is
variable argslv : UNRESOLVED_SIGNED (arg'length-1 downto 0);
variable result : UNRESOLVED_sfixed (arg'range);
begin
argslv := to_s (arg);
if COUNT > 0 then
argslv := argslv sra COUNT;
else
-- Arithmetic shift left on a 2's complement number is a logic shift
argslv := argslv sll -COUNT;
end if;
result := to_fixed (argslv, result'high, result'low);
return result;
end function "sra";
-- Because some people want the older functions.
function SHIFT_LEFT (ARG : UNRESOLVED_ufixed; COUNT : NATURAL)
return UNRESOLVED_ufixed is
begin
if (ARG'length < 1) then
return NAUF;
end if;
return ARG sla COUNT;
end function SHIFT_LEFT;
function SHIFT_RIGHT (ARG : UNRESOLVED_ufixed; COUNT : NATURAL)
return UNRESOLVED_ufixed is
begin
if (ARG'length < 1) then
return NAUF;
end if;
return ARG sra COUNT;
end function SHIFT_RIGHT;
function SHIFT_LEFT (ARG : UNRESOLVED_sfixed; COUNT : NATURAL)
return UNRESOLVED_sfixed is
begin
if (ARG'length < 1) then
return NASF;
end if;
return ARG sla COUNT;
end function SHIFT_LEFT;
function SHIFT_RIGHT (ARG : UNRESOLVED_sfixed; COUNT : NATURAL)
return UNRESOLVED_sfixed is
begin
if (ARG'length < 1) then
return NASF;
end if;
return ARG sra COUNT;
end function SHIFT_RIGHT;
----------------------------------------------------------------------------
-- logical functions
----------------------------------------------------------------------------
function "not" (L : UNRESOLVED_ufixed) return UNRESOLVED_ufixed is
variable RESULT : STD_ULOGIC_VECTOR(L'length-1 downto 0); -- force downto
begin
RESULT := not to_sulv(L);
return to_ufixed(RESULT, L'high, L'low);
end function "not";
function "and" (L, R : UNRESOLVED_ufixed) return UNRESOLVED_ufixed is
variable RESULT : STD_ULOGIC_VECTOR(L'length-1 downto 0); -- force downto
begin
if (L'high = R'high and L'low = R'low) then
RESULT := to_sulv(L) and to_sulv(R);
else
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """and"": Range error L'RANGE /= R'RANGE"
severity warning;
RESULT := (others => 'X');
end if;
return to_ufixed(RESULT, L'high, L'low);
end function "and";
function "or" (L, R : UNRESOLVED_ufixed) return UNRESOLVED_ufixed is
variable RESULT : STD_ULOGIC_VECTOR(L'length-1 downto 0); -- force downto
begin
if (L'high = R'high and L'low = R'low) then
RESULT := to_sulv(L) or to_sulv(R);
else
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """or"": Range error L'RANGE /= R'RANGE"
severity warning;
RESULT := (others => 'X');
end if;
return to_ufixed(RESULT, L'high, L'low);
end function "or";
function "nand" (L, R : UNRESOLVED_ufixed) return UNRESOLVED_ufixed is
variable RESULT : STD_ULOGIC_VECTOR(L'length-1 downto 0); -- force downto
begin
if (L'high = R'high and L'low = R'low) then
RESULT := to_sulv(L) nand to_sulv(R);
else
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """nand"": Range error L'RANGE /= R'RANGE"
severity warning;
RESULT := (others => 'X');
end if;
return to_ufixed(RESULT, L'high, L'low);
end function "nand";
function "nor" (L, R : UNRESOLVED_ufixed) return UNRESOLVED_ufixed is
variable RESULT : STD_ULOGIC_VECTOR(L'length-1 downto 0); -- force downto
begin
if (L'high = R'high and L'low = R'low) then
RESULT := to_sulv(L) nor to_sulv(R);
else
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """nor"": Range error L'RANGE /= R'RANGE"
severity warning;
RESULT := (others => 'X');
end if;
return to_ufixed(RESULT, L'high, L'low);
end function "nor";
function "xor" (L, R : UNRESOLVED_ufixed) return UNRESOLVED_ufixed is
variable RESULT : STD_ULOGIC_VECTOR(L'length-1 downto 0); -- force downto
begin
if (L'high = R'high and L'low = R'low) then
RESULT := to_sulv(L) xor to_sulv(R);
else
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """xor"": Range error L'RANGE /= R'RANGE"
severity warning;
RESULT := (others => 'X');
end if;
return to_ufixed(RESULT, L'high, L'low);
end function "xor";
function "xnor" (L, R : UNRESOLVED_ufixed) return UNRESOLVED_ufixed is
variable RESULT : STD_ULOGIC_VECTOR(L'length-1 downto 0); -- force downto
begin
if (L'high = R'high and L'low = R'low) then
RESULT := to_sulv(L) xnor to_sulv(R);
else
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """xnor"": Range error L'RANGE /= R'RANGE"
severity warning;
RESULT := (others => 'X');
end if;
return to_ufixed(RESULT, L'high, L'low);
end function "xnor";
function "not" (L : UNRESOLVED_sfixed) return UNRESOLVED_sfixed is
variable RESULT : STD_ULOGIC_VECTOR(L'length-1 downto 0); -- force downto
begin
RESULT := not to_sulv(L);
return to_sfixed(RESULT, L'high, L'low);
end function "not";
function "and" (L, R : UNRESOLVED_sfixed) return UNRESOLVED_sfixed is
variable RESULT : STD_ULOGIC_VECTOR(L'length-1 downto 0); -- force downto
begin
if (L'high = R'high and L'low = R'low) then
RESULT := to_sulv(L) and to_sulv(R);
else
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """and"": Range error L'RANGE /= R'RANGE"
severity warning;
RESULT := (others => 'X');
end if;
return to_sfixed(RESULT, L'high, L'low);
end function "and";
function "or" (L, R : UNRESOLVED_sfixed) return UNRESOLVED_sfixed is
variable RESULT : STD_ULOGIC_VECTOR(L'length-1 downto 0); -- force downto
begin
if (L'high = R'high and L'low = R'low) then
RESULT := to_sulv(L) or to_sulv(R);
else
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """or"": Range error L'RANGE /= R'RANGE"
severity warning;
RESULT := (others => 'X');
end if;
return to_sfixed(RESULT, L'high, L'low);
end function "or";
function "nand" (L, R : UNRESOLVED_sfixed) return UNRESOLVED_sfixed is
variable RESULT : STD_ULOGIC_VECTOR(L'length-1 downto 0); -- force downto
begin
if (L'high = R'high and L'low = R'low) then
RESULT := to_sulv(L) nand to_sulv(R);
else
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """nand"": Range error L'RANGE /= R'RANGE"
severity warning;
RESULT := (others => 'X');
end if;
return to_sfixed(RESULT, L'high, L'low);
end function "nand";
function "nor" (L, R : UNRESOLVED_sfixed) return UNRESOLVED_sfixed is
variable RESULT : STD_ULOGIC_VECTOR(L'length-1 downto 0); -- force downto
begin
if (L'high = R'high and L'low = R'low) then
RESULT := to_sulv(L) nor to_sulv(R);
else
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """nor"": Range error L'RANGE /= R'RANGE"
severity warning;
RESULT := (others => 'X');
end if;
return to_sfixed(RESULT, L'high, L'low);
end function "nor";
function "xor" (L, R : UNRESOLVED_sfixed) return UNRESOLVED_sfixed is
variable RESULT : STD_ULOGIC_VECTOR(L'length-1 downto 0); -- force downto
begin
if (L'high = R'high and L'low = R'low) then
RESULT := to_sulv(L) xor to_sulv(R);
else
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """xor"": Range error L'RANGE /= R'RANGE"
severity warning;
RESULT := (others => 'X');
end if;
return to_sfixed(RESULT, L'high, L'low);
end function "xor";
function "xnor" (L, R : UNRESOLVED_sfixed) return UNRESOLVED_sfixed is
variable RESULT : STD_ULOGIC_VECTOR(L'length-1 downto 0); -- force downto
begin
if (L'high = R'high and L'low = R'low) then
RESULT := to_sulv(L) xnor to_sulv(R);
else
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """xnor"": Range error L'RANGE /= R'RANGE"
severity warning;
RESULT := (others => 'X');
end if;
return to_sfixed(RESULT, L'high, L'low);
end function "xnor";
-- Vector and std_ulogic functions, same as functions in numeric_std
function "and" (L : STD_ULOGIC; R : UNRESOLVED_ufixed)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (R'range);
begin
for i in result'range loop
result(i) := L and R(i);
end loop;
return result;
end function "and";
function "and" (L : UNRESOLVED_ufixed; R : STD_ULOGIC)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (L'range);
begin
for i in result'range loop
result(i) := L(i) and R;
end loop;
return result;
end function "and";
function "or" (L : STD_ULOGIC; R : UNRESOLVED_ufixed)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (R'range);
begin
for i in result'range loop
result(i) := L or R(i);
end loop;
return result;
end function "or";
function "or" (L : UNRESOLVED_ufixed; R : STD_ULOGIC)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (L'range);
begin
for i in result'range loop
result(i) := L(i) or R;
end loop;
return result;
end function "or";
function "nand" (L : STD_ULOGIC; R : UNRESOLVED_ufixed)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (R'range);
begin
for i in result'range loop
result(i) := L nand R(i);
end loop;
return result;
end function "nand";
function "nand" (L : UNRESOLVED_ufixed; R : STD_ULOGIC)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (L'range);
begin
for i in result'range loop
result(i) := L(i) nand R;
end loop;
return result;
end function "nand";
function "nor" (L : STD_ULOGIC; R : UNRESOLVED_ufixed)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (R'range);
begin
for i in result'range loop
result(i) := L nor R(i);
end loop;
return result;
end function "nor";
function "nor" (L : UNRESOLVED_ufixed; R : STD_ULOGIC)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (L'range);
begin
for i in result'range loop
result(i) := L(i) nor R;
end loop;
return result;
end function "nor";
function "xor" (L : STD_ULOGIC; R : UNRESOLVED_ufixed)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (R'range);
begin
for i in result'range loop
result(i) := L xor R(i);
end loop;
return result;
end function "xor";
function "xor" (L : UNRESOLVED_ufixed; R : STD_ULOGIC)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (L'range);
begin
for i in result'range loop
result(i) := L(i) xor R;
end loop;
return result;
end function "xor";
function "xnor" (L : STD_ULOGIC; R : UNRESOLVED_ufixed)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (R'range);
begin
for i in result'range loop
result(i) := L xnor R(i);
end loop;
return result;
end function "xnor";
function "xnor" (L : UNRESOLVED_ufixed; R : STD_ULOGIC)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (L'range);
begin
for i in result'range loop
result(i) := L(i) xnor R;
end loop;
return result;
end function "xnor";
function "and" (L : STD_ULOGIC; R : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (R'range);
begin
for i in result'range loop
result(i) := L and R(i);
end loop;
return result;
end function "and";
function "and" (L : UNRESOLVED_sfixed; R : STD_ULOGIC)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (L'range);
begin
for i in result'range loop
result(i) := L(i) and R;
end loop;
return result;
end function "and";
function "or" (L : STD_ULOGIC; R : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (R'range);
begin
for i in result'range loop
result(i) := L or R(i);
end loop;
return result;
end function "or";
function "or" (L : UNRESOLVED_sfixed; R : STD_ULOGIC)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (L'range);
begin
for i in result'range loop
result(i) := L(i) or R;
end loop;
return result;
end function "or";
function "nand" (L : STD_ULOGIC; R : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (R'range);
begin
for i in result'range loop
result(i) := L nand R(i);
end loop;
return result;
end function "nand";
function "nand" (L : UNRESOLVED_sfixed; R : STD_ULOGIC)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (L'range);
begin
for i in result'range loop
result(i) := L(i) nand R;
end loop;
return result;
end function "nand";
function "nor" (L : STD_ULOGIC; R : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (R'range);
begin
for i in result'range loop
result(i) := L nor R(i);
end loop;
return result;
end function "nor";
function "nor" (L : UNRESOLVED_sfixed; R : STD_ULOGIC)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (L'range);
begin
for i in result'range loop
result(i) := L(i) nor R;
end loop;
return result;
end function "nor";
function "xor" (L : STD_ULOGIC; R : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (R'range);
begin
for i in result'range loop
result(i) := L xor R(i);
end loop;
return result;
end function "xor";
function "xor" (L : UNRESOLVED_sfixed; R : STD_ULOGIC)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (L'range);
begin
for i in result'range loop
result(i) := L(i) xor R;
end loop;
return result;
end function "xor";
function "xnor" (L : STD_ULOGIC; R : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (R'range);
begin
for i in result'range loop
result(i) := L xnor R(i);
end loop;
return result;
end function "xnor";
function "xnor" (L : UNRESOLVED_sfixed; R : STD_ULOGIC)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (L'range);
begin
for i in result'range loop
result(i) := L(i) xnor R;
end loop;
return result;
end function "xnor";
-- Reduction operators
function "and" (l : UNRESOLVED_ufixed) return STD_ULOGIC is
begin
return and to_sulv(l);
end function "and";
function "nand" (l : UNRESOLVED_ufixed) return STD_ULOGIC is
begin
return nand to_sulv(l);
end function "nand";
function "or" (l : UNRESOLVED_ufixed) return STD_ULOGIC is
begin
return or to_sulv(l);
end function "or";
function "nor" (l : UNRESOLVED_ufixed) return STD_ULOGIC is
begin
return nor to_sulv(l);
end function "nor";
function "xor" (l : UNRESOLVED_ufixed) return STD_ULOGIC is
begin
return xor to_sulv(l);
end function "xor";
function "xnor" (l : UNRESOLVED_ufixed) return STD_ULOGIC is
begin
return xnor to_sulv(l);
end function "xnor";
function "and" (l : UNRESOLVED_sfixed) return STD_ULOGIC is
begin
return and to_sulv(l);
end function "and";
function "nand" (l : UNRESOLVED_sfixed) return STD_ULOGIC is
begin
return nand to_sulv(l);
end function "nand";
function "or" (l : UNRESOLVED_sfixed) return STD_ULOGIC is
begin
return or to_sulv(l);
end function "or";
function "nor" (l : UNRESOLVED_sfixed) return STD_ULOGIC is
begin
return nor to_sulv(l);
end function "nor";
function "xor" (l : UNRESOLVED_sfixed) return STD_ULOGIC is
begin
return xor to_sulv(l);
end function "xor";
function "xnor" (l : UNRESOLVED_sfixed) return STD_ULOGIC is
begin
return xnor to_sulv(l);
end function "xnor";
-- End reduction operators
function "?=" (L, R : UNRESOLVED_ufixed) return STD_ULOGIC is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_UNSIGNED (lresize'length-1 downto 0);
begin -- ?=
if ((L'length < 1) or (R'length < 1)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """?="": null detected, returning X"
severity warning;
return 'X';
else
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_uns (lresize);
rslv := to_uns (rresize);
return lslv ?= rslv;
end if;
end function "?=";
function "?/=" (L, R : UNRESOLVED_ufixed) return STD_ULOGIC is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_UNSIGNED (lresize'length-1 downto 0);
begin -- ?/=
if ((L'length < 1) or (R'length < 1)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """?/="": null detected, returning X"
severity warning;
return 'X';
else
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_uns (lresize);
rslv := to_uns (rresize);
return lslv ?/= rslv;
end if;
end function "?/=";
function "?>" (L, R : UNRESOLVED_ufixed) return STD_ULOGIC is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_UNSIGNED (lresize'length-1 downto 0);
begin -- ?>
if ((l'length < 1) or (r'length < 1)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """?>"": null detected, returning X"
severity warning;
return 'X';
else
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_uns (lresize);
rslv := to_uns (rresize);
return lslv ?> rslv;
end if;
end function "?>";
function "?>=" (L, R : UNRESOLVED_ufixed) return STD_ULOGIC is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_UNSIGNED (lresize'length-1 downto 0);
begin -- ?>=
if ((l'length < 1) or (r'length < 1)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """?>="": null detected, returning X"
severity warning;
return 'X';
else
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_uns (lresize);
rslv := to_uns (rresize);
return lslv ?>= rslv;
end if;
end function "?>=";
function "?<" (L, R : UNRESOLVED_ufixed) return STD_ULOGIC is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_UNSIGNED (lresize'length-1 downto 0);
begin -- ?<
if ((l'length < 1) or (r'length < 1)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """?<"": null detected, returning X"
severity warning;
return 'X';
else
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_uns (lresize);
rslv := to_uns (rresize);
return lslv ?< rslv;
end if;
end function "?<";
function "?<=" (L, R : UNRESOLVED_ufixed) return STD_ULOGIC is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_UNSIGNED (lresize'length-1 downto 0);
begin -- ?<=
if ((l'length < 1) or (r'length < 1)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """?<="": null detected, returning X"
severity warning;
return 'X';
else
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_uns (lresize);
rslv := to_uns (rresize);
return lslv ?<= rslv;
end if;
end function "?<=";
function "?=" (L, R : UNRESOLVED_sfixed) return STD_ULOGIC is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_SIGNED (lresize'length-1 downto 0);
begin -- ?=
if ((L'length < 1) or (R'length < 1)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """?="": null detected, returning X"
severity warning;
return 'X';
else
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_s (lresize);
rslv := to_s (rresize);
return lslv ?= rslv;
end if;
end function "?=";
function "?/=" (L, R : UNRESOLVED_sfixed) return STD_ULOGIC is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_SIGNED (lresize'length-1 downto 0);
begin -- ?/=
if ((L'length < 1) or (R'length < 1)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """?/="": null detected, returning X"
severity warning;
return 'X';
else
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_s (lresize);
rslv := to_s (rresize);
return lslv ?/= rslv;
end if;
end function "?/=";
function "?>" (L, R : UNRESOLVED_sfixed) return STD_ULOGIC is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_SIGNED (lresize'length-1 downto 0);
begin -- ?>
if ((l'length < 1) or (r'length < 1)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """?>"": null detected, returning X"
severity warning;
return 'X';
else
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_s (lresize);
rslv := to_s (rresize);
return lslv ?> rslv;
end if;
end function "?>";
function "?>=" (L, R : UNRESOLVED_sfixed) return STD_ULOGIC is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_SIGNED (lresize'length-1 downto 0);
begin -- ?>=
if ((l'length < 1) or (r'length < 1)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """?>="": null detected, returning X"
severity warning;
return 'X';
else
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_s (lresize);
rslv := to_s (rresize);
return lslv ?>= rslv;
end if;
end function "?>=";
function "?<" (L, R : UNRESOLVED_sfixed) return STD_ULOGIC is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_SIGNED (lresize'length-1 downto 0);
begin -- ?<
if ((l'length < 1) or (r'length < 1)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """?<"": null detected, returning X"
severity warning;
return 'X';
else
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_s (lresize);
rslv := to_s (rresize);
return lslv ?< rslv;
end if;
end function "?<";
function "?<=" (L, R : UNRESOLVED_sfixed) return STD_ULOGIC is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_SIGNED (lresize'length-1 downto 0);
begin -- ?<=
if ((l'length < 1) or (r'length < 1)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """?<="": null detected, returning X"
severity warning;
return 'X';
else
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_s (lresize);
rslv := to_s (rresize);
return lslv ?<= rslv;
end if;
end function "?<=";
-- Match function, similar to "std_match" from numeric_std
function std_match (L, R : UNRESOLVED_ufixed) return BOOLEAN is
begin
if (L'high = R'high and L'low = R'low) then
return std_match(to_sulv(L), to_sulv(R));
else
assert NO_WARNING
report fixed_generic_pkg'instance_name
& "STD_MATCH: L'RANGE /= R'RANGE, returning FALSE"
severity warning;
return false;
end if;
end function std_match;
function std_match (L, R : UNRESOLVED_sfixed) return BOOLEAN is
begin
if (L'high = R'high and L'low = R'low) then
return std_match(to_sulv(L), to_sulv(R));
else
assert NO_WARNING
report fixed_generic_pkg'instance_name
& "STD_MATCH: L'RANGE /= R'RANGE, returning FALSE"
severity warning;
return false;
end if;
end function std_match;
-- compare functions
function "=" (
l, r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN
is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_UNSIGNED (lresize'length-1 downto 0);
begin
if (l'length < 1 or r'length < 1) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """="": null argument detected, returning FALSE"
severity warning;
return false;
elsif (Is_X(l) or Is_X(r)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """="": metavalue detected, returning FALSE"
severity warning;
return false;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_uns (lresize);
rslv := to_uns (rresize);
return lslv = rslv;
end function "=";
function "=" (
l, r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN
is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_SIGNED (lresize'length-1 downto 0);
begin
if (l'length < 1 or r'length < 1) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """="": null argument detected, returning FALSE"
severity warning;
return false;
elsif (Is_X(l) or Is_X(r)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """="": metavalue detected, returning FALSE"
severity warning;
return false;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_s (lresize);
rslv := to_s (rresize);
return lslv = rslv;
end function "=";
function "/=" (
l, r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN
is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_UNSIGNED (lresize'length-1 downto 0);
begin
if (l'length < 1 or r'length < 1) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """/="": null argument detected, returning TRUE"
severity warning;
return true;
elsif (Is_X(l) or Is_X(r)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """/="": metavalue detected, returning TRUE"
severity warning;
return true;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_uns (lresize);
rslv := to_uns (rresize);
return lslv /= rslv;
end function "/=";
function "/=" (
l, r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN
is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_SIGNED (lresize'length-1 downto 0);
begin
if (l'length < 1 or r'length < 1) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """/="": null argument detected, returning TRUE"
severity warning;
return true;
elsif (Is_X(l) or Is_X(r)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """/="": metavalue detected, returning TRUE"
severity warning;
return true;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_s (lresize);
rslv := to_s (rresize);
return lslv /= rslv;
end function "/=";
function ">" (
l, r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN
is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_UNSIGNED (lresize'length-1 downto 0);
begin
if (l'length < 1 or r'length < 1) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """>"": null argument detected, returning FALSE"
severity warning;
return false;
elsif (Is_X(l) or Is_X(r)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """>"": metavalue detected, returning FALSE"
severity warning;
return false;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_uns (lresize);
rslv := to_uns (rresize);
return lslv > rslv;
end function ">";
function ">" (
l, r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN
is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_SIGNED (lresize'length-1 downto 0);
begin
if (l'length < 1 or r'length < 1) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """>"": null argument detected, returning FALSE"
severity warning;
return false;
elsif (Is_X(l) or Is_X(r)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """>"": metavalue detected, returning FALSE"
severity warning;
return false;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_s (lresize);
rslv := to_s (rresize);
return lslv > rslv;
end function ">";
function "<" (
l, r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN
is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_UNSIGNED (lresize'length-1 downto 0);
begin
if (l'length < 1 or r'length < 1) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """<"": null argument detected, returning FALSE"
severity warning;
return false;
elsif (Is_X(l) or Is_X(r)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """<"": metavalue detected, returning FALSE"
severity warning;
return false;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_uns (lresize);
rslv := to_uns (rresize);
return lslv < rslv;
end function "<";
function "<" (
l, r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN
is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_SIGNED (lresize'length-1 downto 0);
begin
if (l'length < 1 or r'length < 1) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """<"": null argument detected, returning FALSE"
severity warning;
return false;
elsif (Is_X(l) or Is_X(r)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """<"": metavalue detected, returning FALSE"
severity warning;
return false;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_s (lresize);
rslv := to_s (rresize);
return lslv < rslv;
end function "<";
function ">=" (
l, r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN
is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_UNSIGNED (lresize'length-1 downto 0);
begin
if (l'length < 1 or r'length < 1) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """>="": null argument detected, returning FALSE"
severity warning;
return false;
elsif (Is_X(l) or Is_X(r)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """>="": metavalue detected, returning FALSE"
severity warning;
return false;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_uns (lresize);
rslv := to_uns (rresize);
return lslv >= rslv;
end function ">=";
function ">=" (
l, r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN
is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_SIGNED (lresize'length-1 downto 0);
begin
if (l'length < 1 or r'length < 1) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """>="": null argument detected, returning FALSE"
severity warning;
return false;
elsif (Is_X(l) or Is_X(r)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """>="": metavalue detected, returning FALSE"
severity warning;
return false;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_s (lresize);
rslv := to_s (rresize);
return lslv >= rslv;
end function ">=";
function "<=" (
l, r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN
is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_UNSIGNED (lresize'length-1 downto 0);
begin
if (l'length < 1 or r'length < 1) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """<="": null argument detected, returning FALSE"
severity warning;
return false;
elsif (Is_X(l) or Is_X(r)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """<="": metavalue detected, returning FALSE"
severity warning;
return false;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_uns (lresize);
rslv := to_uns (rresize);
return lslv <= rslv;
end function "<=";
function "<=" (
l, r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN
is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_SIGNED (lresize'length-1 downto 0);
begin
if (l'length < 1 or r'length < 1) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """<="": null argument detected, returning FALSE"
severity warning;
return false;
elsif (Is_X(l) or Is_X(r)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """<="": metavalue detected, returning FALSE"
severity warning;
return false;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_s (lresize);
rslv := to_s (rresize);
return lslv <= rslv;
end function "<=";
-- overloads of the default maximum and minimum functions
function maximum (l, r : UNRESOLVED_ufixed) return UNRESOLVED_ufixed is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
begin
if (l'length < 1 or r'length < 1) then
return NAUF;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
return to_fixed(maximum(to_uns(lresize), to_uns(rresize)),
left_index, right_index);
end function maximum;
function maximum (l, r : UNRESOLVED_sfixed) return UNRESOLVED_sfixed is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
begin
if (l'length < 1 or r'length < 1) then
return NASF;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
return to_fixed(maximum(to_s(lresize), to_s(rresize)),
left_index, right_index);
end function maximum;
function minimum (l, r : UNRESOLVED_ufixed) return UNRESOLVED_ufixed is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
begin
if (l'length < 1 or r'length < 1) then
return NAUF;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
return to_fixed(minimum(to_uns(lresize), to_uns(rresize)),
left_index, right_index);
end function minimum;
function minimum (l, r : UNRESOLVED_sfixed) return UNRESOLVED_sfixed is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
begin
if (l'length < 1 or r'length < 1) then
return NASF;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
return to_fixed(minimum(to_s(lresize), to_s(rresize)),
left_index, right_index);
end function minimum;
function to_ufixed (
arg : NATURAL; -- integer
constant left_index : INTEGER; -- left index (high index)
constant right_index : INTEGER := 0; -- right index
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_ufixed
is
constant fw : INTEGER := mins (right_index, right_index); -- catch literals
variable result : UNRESOLVED_ufixed (left_index downto fw);
variable sresult : UNRESOLVED_ufixed (left_index downto 0) :=
(others => '0'); -- integer portion
variable argx : NATURAL; -- internal version of arg
begin
if (result'length < 1) then
return NAUF;
end if;
if arg /= 0 then
argx := arg;
for I in 0 to sresult'left loop
if (argx mod 2) = 0 then
sresult(I) := '0';
else
sresult(I) := '1';
end if;
argx := argx/2;
end loop;
if argx /= 0 then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& "TO_UFIXED(NATURAL): vector truncated"
severity warning;
if overflow_style = fixed_saturate then
return saturate (left_index, right_index);
end if;
end if;
result := resize (arg => sresult,
left_index => left_index,
right_index => right_index,
round_style => round_style,
overflow_style => overflow_style);
else
result := (others => '0');
end if;
return result;
end function to_ufixed;
function to_sfixed (
arg : INTEGER; -- integer
constant left_index : INTEGER; -- left index (high index)
constant right_index : INTEGER := 0; -- right index
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_sfixed
is
constant fw : INTEGER := mins (right_index, right_index); -- catch literals
variable result : UNRESOLVED_sfixed (left_index downto fw);
variable sresult : UNRESOLVED_sfixed (left_index downto 0) :=
(others => '0'); -- integer portion
variable argx : INTEGER; -- internal version of arg
variable sign : STD_ULOGIC; -- sign of input
begin
if (result'length < 1) then -- null range
return NASF;
end if;
if arg /= 0 then
if (arg < 0) then
sign := '1';
argx := -(arg + 1);
else
sign := '0';
argx := arg;
end if;
for I in 0 to sresult'left loop
if (argx mod 2) = 0 then
sresult(I) := sign;
else
sresult(I) := not sign;
end if;
argx := argx/2;
end loop;
if argx /= 0 or left_index < 0 or sign /= sresult(sresult'left) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& "TO_SFIXED(INTEGER): vector truncated"
severity warning;
if overflow_style = fixed_saturate then -- saturate
if arg < 0 then
result := not saturate (result'high, result'low); -- underflow
else
result := saturate (result'high, result'low); -- overflow
end if;
return result;
end if;
end if;
result := resize (arg => sresult,
left_index => left_index,
right_index => right_index,
round_style => round_style,
overflow_style => overflow_style);
else
result := (others => '0');
end if;
return result;
end function to_sfixed;
function to_ufixed (
arg : REAL; -- real
constant left_index : INTEGER; -- left index (high index)
constant right_index : INTEGER; -- right index
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style;
constant guard_bits : NATURAL := fixed_guard_bits) -- # of guard bits
return UNRESOLVED_ufixed
is
constant fw : INTEGER := mins (right_index, right_index); -- catch literals
variable result : UNRESOLVED_ufixed (left_index downto fw) :=
(others => '0');
variable Xresult : UNRESOLVED_ufixed (left_index downto
fw-guard_bits) :=
(others => '0');
variable presult : REAL;
begin
-- If negative or null range, return.
if (left_index < fw) then
return NAUF;
end if;
if (arg < 0.0) then
report fixed_generic_pkg'instance_name
& "TO_UFIXED: Negative argument passed "
& REAL'image(arg) severity error;
return result;
end if;
presult := arg;
if presult >= (2.0**(left_index+1)) then
assert NO_WARNING report fixed_generic_pkg'instance_name
& "TO_UFIXED(REAL): vector truncated"
severity warning;
if overflow_style = fixed_wrap then
presult := presult mod (2.0**(left_index+1)); -- wrap
else
return saturate (result'high, result'low);
end if;
end if;
for i in Xresult'range loop
if presult >= 2.0**i then
Xresult(i) := '1';
presult := presult - 2.0**i;
else
Xresult(i) := '0';
end if;
end loop;
if guard_bits > 0 and round_style = fixed_round then
result := round_fixed (arg => Xresult (left_index
downto right_index),
remainder => Xresult (right_index-1 downto
right_index-guard_bits),
overflow_style => overflow_style);
else
result := Xresult (result'range);
end if;
return result;
end function to_ufixed;
function to_sfixed (
arg : REAL; -- real
constant left_index : INTEGER; -- left index (high index)
constant right_index : INTEGER; -- right index
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style;
constant guard_bits : NATURAL := fixed_guard_bits) -- # of guard bits
return UNRESOLVED_sfixed
is
constant fw : INTEGER := mins (right_index, right_index); -- catch literals
variable result : UNRESOLVED_sfixed (left_index downto fw) :=
(others => '0');
variable Xresult : UNRESOLVED_sfixed (left_index+1 downto fw-guard_bits) :=
(others => '0');
variable presult : REAL;
begin
if (left_index < fw) then -- null range
return NASF;
end if;
if (arg >= (2.0**left_index) or arg < -(2.0**left_index)) then
assert NO_WARNING report fixed_generic_pkg'instance_name
& "TO_SFIXED(REAL): vector truncated"
severity warning;
if overflow_style = fixed_saturate then
if arg < 0.0 then -- saturate
result := not saturate (result'high, result'low); -- underflow
else
result := saturate (result'high, result'low); -- overflow
end if;
return result;
else
presult := abs(arg) mod (2.0**(left_index+1)); -- wrap
end if;
else
presult := abs(arg);
end if;
for i in Xresult'range loop
if presult >= 2.0**i then
Xresult(i) := '1';
presult := presult - 2.0**i;
else
Xresult(i) := '0';
end if;
end loop;
if arg < 0.0 then
Xresult := to_fixed(-to_s(Xresult), Xresult'high, Xresult'low);
end if;
if guard_bits > 0 and round_style = fixed_round then
result := round_fixed (arg => Xresult (left_index
downto right_index),
remainder => Xresult (right_index-1 downto
right_index-guard_bits),
overflow_style => overflow_style);
else
result := Xresult (result'range);
end if;
return result;
end function to_sfixed;
function to_ufixed (
arg : UNRESOLVED_UNSIGNED; -- unsigned
constant left_index : INTEGER; -- left index (high index)
constant right_index : INTEGER := 0; -- right index
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_ufixed
is
constant ARG_LEFT : INTEGER := ARG'length-1;
alias XARG : UNRESOLVED_UNSIGNED(ARG_LEFT downto 0) is ARG;
variable result : UNRESOLVED_ufixed (left_index downto right_index);
begin
if arg'length < 1 or (left_index < right_index) then
return NAUF;
end if;
result := resize (arg => UNRESOLVED_ufixed (XARG),
left_index => left_index,
right_index => right_index,
round_style => round_style,
overflow_style => overflow_style);
return result;
end function to_ufixed;
-- converted version
function to_ufixed (
arg : UNRESOLVED_UNSIGNED) -- unsigned
return UNRESOLVED_ufixed
is
constant ARG_LEFT : INTEGER := ARG'length-1;
alias XARG : UNRESOLVED_UNSIGNED(ARG_LEFT downto 0) is ARG;
begin
if arg'length < 1 then
return NAUF;
end if;
return UNRESOLVED_ufixed(xarg);
end function to_ufixed;
function to_sfixed (
arg : UNRESOLVED_SIGNED; -- signed
constant left_index : INTEGER; -- left index (high index)
constant right_index : INTEGER := 0; -- right index
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_sfixed
is
constant ARG_LEFT : INTEGER := ARG'length-1;
alias XARG : UNRESOLVED_SIGNED(ARG_LEFT downto 0) is ARG;
variable result : UNRESOLVED_sfixed (left_index downto right_index);
begin
if arg'length < 1 or (left_index < right_index) then
return NASF;
end if;
result := resize (arg => UNRESOLVED_sfixed (XARG),
left_index => left_index,
right_index => right_index,
round_style => round_style,
overflow_style => overflow_style);
return result;
end function to_sfixed;
-- converted version
function to_sfixed (
arg : UNRESOLVED_SIGNED) -- signed
return UNRESOLVED_sfixed
is
constant ARG_LEFT : INTEGER := ARG'length-1;
alias XARG : UNRESOLVED_SIGNED(ARG_LEFT downto 0) is ARG;
begin
if arg'length < 1 then
return NASF;
end if;
return UNRESOLVED_sfixed(xarg);
end function to_sfixed;
function to_sfixed (arg : UNRESOLVED_ufixed) return UNRESOLVED_sfixed is
variable result : UNRESOLVED_sfixed (arg'high+1 downto arg'low);
begin
if arg'length < 1 then
return NASF;
end if;
result (arg'high downto arg'low) := UNRESOLVED_sfixed(cleanvec(arg));
result (arg'high+1) := '0';
return result;
end function to_sfixed;
-- Because of the fairly complicated sizing rules in the fixed point
-- packages these functions are provided to compute the result ranges
-- Example:
-- signal uf1 : ufixed (3 downto -3);
-- signal uf2 : ufixed (4 downto -2);
-- signal uf1multuf2 : ufixed (ufixed_high (3, -3, '*', 4, -2) downto
-- ufixed_low (3, -3, '*', 4, -2));
-- uf1multuf2 <= uf1 * uf2;
-- Valid characters: '+', '-', '*', '/', 'r' or 'R' (rem), 'm' or 'M' (mod),
-- '1' (reciprocal), 'A', 'a' (abs), 'N', 'n' (-sfixed)
function ufixed_high (left_index, right_index : INTEGER;
operation : CHARACTER := 'X';
left_index2, right_index2 : INTEGER := 0)
return INTEGER is
begin
case operation is
when '+'| '-' => return maximum (left_index, left_index2) + 1;
when '*' => return left_index + left_index2 + 1;
when '/' => return left_index - right_index2;
when '1' => return -right_index; -- reciprocal
when 'R'|'r' => return mins (left_index, left_index2); -- "rem"
when 'M'|'m' => return mins (left_index, left_index2); -- "mod"
when others => return left_index; -- For abs and default
end case;
end function ufixed_high;
function ufixed_low (left_index, right_index : INTEGER;
operation : CHARACTER := 'X';
left_index2, right_index2 : INTEGER := 0)
return INTEGER is
begin
case operation is
when '+'| '-' => return mins (right_index, right_index2);
when '*' => return right_index + right_index2;
when '/' => return right_index - left_index2 - 1;
when '1' => return -left_index - 1; -- reciprocal
when 'R'|'r' => return mins (right_index, right_index2); -- "rem"
when 'M'|'m' => return mins (right_index, right_index2); -- "mod"
when others => return right_index; -- for abs and default
end case;
end function ufixed_low;
function sfixed_high (left_index, right_index : INTEGER;
operation : CHARACTER := 'X';
left_index2, right_index2 : INTEGER := 0)
return INTEGER is
begin
case operation is
when '+'| '-' => return maximum (left_index, left_index2) + 1;
when '*' => return left_index + left_index2 + 1;
when '/' => return left_index - right_index2 + 1;
when '1' => return -right_index + 1; -- reciprocal
when 'R'|'r' => return mins (left_index, left_index2); -- "rem"
when 'M'|'m' => return left_index2; -- "mod"
when 'A'|'a' => return left_index + 1; -- "abs"
when 'N'|'n' => return left_index + 1; -- -sfixed
when others => return left_index;
end case;
end function sfixed_high;
function sfixed_low (left_index, right_index : INTEGER;
operation : CHARACTER := 'X';
left_index2, right_index2 : INTEGER := 0)
return INTEGER is
begin
case operation is
when '+'| '-' => return mins (right_index, right_index2);
when '*' => return right_index + right_index2;
when '/' => return right_index - left_index2;
when '1' => return -left_index; -- reciprocal
when 'R'|'r' => return mins (right_index, right_index2); -- "rem"
when 'M'|'m' => return mins (right_index, right_index2); -- "mod"
when others => return right_index; -- default for abs, neg and default
end case;
end function sfixed_low;
-- Same as above, but using the "size_res" input only for their ranges:
-- signal uf1multuf2 : ufixed (ufixed_high (uf1, '*', uf2) downto
-- ufixed_low (uf1, '*', uf2));
-- uf1multuf2 <= uf1 * uf2;
function ufixed_high (size_res : UNRESOLVED_ufixed;
operation : CHARACTER := 'X';
size_res2 : UNRESOLVED_ufixed)
return INTEGER is
begin
return ufixed_high (left_index => size_res'high,
right_index => size_res'low,
operation => operation,
left_index2 => size_res2'high,
right_index2 => size_res2'low);
end function ufixed_high;
function ufixed_low (size_res : UNRESOLVED_ufixed;
operation : CHARACTER := 'X';
size_res2 : UNRESOLVED_ufixed)
return INTEGER is
begin
return ufixed_low (left_index => size_res'high,
right_index => size_res'low,
operation => operation,
left_index2 => size_res2'high,
right_index2 => size_res2'low);
end function ufixed_low;
function sfixed_high (size_res : UNRESOLVED_sfixed;
operation : CHARACTER := 'X';
size_res2 : UNRESOLVED_sfixed)
return INTEGER is
begin
return sfixed_high (left_index => size_res'high,
right_index => size_res'low,
operation => operation,
left_index2 => size_res2'high,
right_index2 => size_res2'low);
end function sfixed_high;
function sfixed_low (size_res : UNRESOLVED_sfixed;
operation : CHARACTER := 'X';
size_res2 : UNRESOLVED_sfixed)
return INTEGER is
begin
return sfixed_low (left_index => size_res'high,
right_index => size_res'low,
operation => operation,
left_index2 => size_res2'high,
right_index2 => size_res2'low);
end function sfixed_low;
-- purpose: returns a saturated number
function saturate (
constant left_index : INTEGER;
constant right_index : INTEGER)
return UNRESOLVED_ufixed
is
constant sat : UNRESOLVED_ufixed (left_index downto right_index) :=
(others => '1');
begin
return sat;
end function saturate;
-- purpose: returns a saturated number
function saturate (
constant left_index : INTEGER;
constant right_index : INTEGER)
return UNRESOLVED_sfixed
is
variable sat : UNRESOLVED_sfixed (left_index downto right_index) :=
(others => '1');
begin
-- saturate positive, to saturate negative, just do "not saturate()"
sat (left_index) := '0';
return sat;
end function saturate;
function saturate (
size_res : UNRESOLVED_ufixed) -- only the size of this is used
return UNRESOLVED_ufixed is
begin
return saturate (size_res'high, size_res'low);
end function saturate;
function saturate (
size_res : UNRESOLVED_sfixed) -- only the size of this is used
return UNRESOLVED_sfixed is
begin
return saturate (size_res'high, size_res'low);
end function saturate;
-- As a concession to those who use a graphical DSP environment,
-- these functions take parameters in those tools format and create
-- fixed point numbers. These functions are designed to convert from
-- a std_logic_vector to the VHDL fixed point format using the conventions
-- of these packages. In a pure VHDL environment you should use the
-- "to_ufixed" and "to_sfixed" routines.
-- Unsigned fixed point
function to_UFix (
arg : STD_ULOGIC_VECTOR;
width : NATURAL; -- width of vector
fraction : NATURAL) -- width of fraction
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (width-fraction-1 downto -fraction);
begin
if (arg'length /= result'length) then
report fixed_generic_pkg'instance_name
& "TO_UFIX (STD_ULOGIC_VECTOR) "
& "Vector lengths do not match. Input length is "
& INTEGER'image(arg'length) & " and output will be "
& INTEGER'image(result'length) & " wide."
severity error;
return NAUF;
else
result := to_ufixed (arg, result'high, result'low);
return result;
end if;
end function to_UFix;
-- signed fixed point
function to_SFix (
arg : STD_ULOGIC_VECTOR;
width : NATURAL; -- width of vector
fraction : NATURAL) -- width of fraction
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (width-fraction-1 downto -fraction);
begin
if (arg'length /= result'length) then
report fixed_generic_pkg'instance_name
& "TO_SFIX (STD_ULOGIC_VECTOR) "
& "Vector lengths do not match. Input length is "
& INTEGER'image(arg'length) & " and output will be "
& INTEGER'image(result'length) & " wide."
severity error;
return NASF;
else
result := to_sfixed (arg, result'high, result'low);
return result;
end if;
end function to_SFix;
-- finding the bounds of a number. These functions can be used like this:
-- signal xxx : ufixed (7 downto -3);
-- -- Which is the same as "ufixed (UFix_high (11,3) downto UFix_low(11,3))"
-- signal yyy : ufixed (UFix_high (11, 3, "+", 11, 3)
-- downto UFix_low(11, 3, "+", 11, 3));
-- Where "11" is the width of xxx (xxx'length),
-- and 3 is the lower bound (abs (xxx'low))
-- In a pure VHDL environment use "ufixed_high" and "ufixed_low"
function ufix_high (
width, fraction : NATURAL;
operation : CHARACTER := 'X';
width2, fraction2 : NATURAL := 0)
return INTEGER is
begin
return ufixed_high (left_index => width - 1 - fraction,
right_index => -fraction,
operation => operation,
left_index2 => width2 - 1 - fraction2,
right_index2 => -fraction2);
end function ufix_high;
function ufix_low (
width, fraction : NATURAL;
operation : CHARACTER := 'X';
width2, fraction2 : NATURAL := 0)
return INTEGER is
begin
return ufixed_low (left_index => width - 1 - fraction,
right_index => -fraction,
operation => operation,
left_index2 => width2 - 1 - fraction2,
right_index2 => -fraction2);
end function ufix_low;
function sfix_high (
width, fraction : NATURAL;
operation : CHARACTER := 'X';
width2, fraction2 : NATURAL := 0)
return INTEGER is
begin
return sfixed_high (left_index => width - fraction,
right_index => -fraction,
operation => operation,
left_index2 => width2 - fraction2,
right_index2 => -fraction2);
end function sfix_high;
function sfix_low (
width, fraction : NATURAL;
operation : CHARACTER := 'X';
width2, fraction2 : NATURAL := 0)
return INTEGER is
begin
return sfixed_low (left_index => width - fraction,
right_index => -fraction,
operation => operation,
left_index2 => width2 - fraction2,
right_index2 => -fraction2);
end function sfix_low;
function to_unsigned (
arg : UNRESOLVED_ufixed; -- ufixed point input
constant size : NATURAL; -- length of output
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_UNSIGNED is
begin
return to_uns(resize (arg => arg,
left_index => size-1,
right_index => 0,
round_style => round_style,
overflow_style => overflow_style));
end function to_unsigned;
function to_unsigned (
arg : UNRESOLVED_ufixed; -- ufixed point input
size_res : UNRESOLVED_UNSIGNED; -- length of output
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_UNSIGNED is
begin
return to_unsigned (arg => arg,
size => size_res'length,
round_style => round_style,
overflow_style => overflow_style);
end function to_unsigned;
function to_signed (
arg : UNRESOLVED_sfixed; -- sfixed point input
constant size : NATURAL; -- length of output
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_SIGNED is
begin
return to_s(resize (arg => arg,
left_index => size-1,
right_index => 0,
round_style => round_style,
overflow_style => overflow_style));
end function to_signed;
function to_signed (
arg : UNRESOLVED_sfixed; -- sfixed point input
size_res : UNRESOLVED_SIGNED; -- used for length of output
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_SIGNED is
begin
return to_signed (arg => arg,
size => size_res'length,
round_style => round_style,
overflow_style => overflow_style);
end function to_signed;
function to_real (
arg : UNRESOLVED_ufixed) -- ufixed point input
return REAL
is
constant left_index : INTEGER := arg'high;
constant right_index : INTEGER := arg'low;
variable result : REAL; -- result
variable arg_int : UNRESOLVED_ufixed (left_index downto right_index);
begin
if (arg'length < 1) then
return 0.0;
end if;
arg_int := to_x01(cleanvec(arg));
if (Is_X(arg_int)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& "TO_REAL (ufixed): metavalue detected, returning 0.0"
severity warning;
return 0.0;
end if;
result := 0.0;
for i in arg_int'range loop
if (arg_int(i) = '1') then
result := result + (2.0**i);
end if;
end loop;
return result;
end function to_real;
function to_real (
arg : UNRESOLVED_sfixed) -- ufixed point input
return REAL
is
constant left_index : INTEGER := arg'high;
constant right_index : INTEGER := arg'low;
variable result : REAL; -- result
variable arg_int : UNRESOLVED_sfixed (left_index downto right_index);
-- unsigned version of argument
variable arg_uns : UNRESOLVED_ufixed (left_index downto right_index);
-- absolute of argument
begin
if (arg'length < 1) then
return 0.0;
end if;
arg_int := to_x01(cleanvec(arg));
if (Is_X(arg_int)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& "TO_REAL (sfixed): metavalue detected, returning 0.0"
severity warning;
return 0.0;
end if;
arg_uns := to_ufixed (arg_int);
result := to_real (arg_uns);
if (arg_int(arg_int'high) = '1') then
result := -result;
end if;
return result;
end function to_real;
function to_integer (
arg : UNRESOLVED_ufixed; -- fixed point input
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return NATURAL
is
constant left_index : INTEGER := arg'high;
variable arg_uns : UNRESOLVED_UNSIGNED (left_index+1 downto 0)
:= (others => '0');
begin
if (arg'length < 1) then
return 0;
end if;
if (Is_X (arg)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& "TO_INTEGER (ufixed): metavalue detected, returning 0"
severity warning;
return 0;
end if;
if (left_index < -1) then
return 0;
end if;
arg_uns := to_uns(resize (arg => arg,
left_index => arg_uns'high,
right_index => 0,
round_style => round_style,
overflow_style => overflow_style));
return to_integer (arg_uns);
end function to_integer;
function to_integer (
arg : UNRESOLVED_sfixed; -- fixed point input
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return INTEGER
is
constant left_index : INTEGER := arg'high;
constant right_index : INTEGER := arg'low;
variable arg_s : UNRESOLVED_SIGNED (left_index+1 downto 0);
begin
if (arg'length < 1) then
return 0;
end if;
if (Is_X (arg)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& "TO_INTEGER (sfixed): metavalue detected, returning 0"
severity warning;
return 0;
end if;
if (left_index < -1) then
return 0;
end if;
arg_s := to_s(resize (arg => arg,
left_index => arg_s'high,
right_index => 0,
round_style => round_style,
overflow_style => overflow_style));
return to_integer (arg_s);
end function to_integer;
function to_01 (
s : UNRESOLVED_ufixed; -- ufixed point input
constant XMAP : STD_ULOGIC := '0') -- Map x to
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (s'range); -- result
begin
if (s'length < 1) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& "TO_01(ufixed): null detected, returning NULL"
severity warning;
return NAUF;
end if;
return to_fixed (to_01(to_uns(s), XMAP), s'high, s'low);
end function to_01;
function to_01 (
s : UNRESOLVED_sfixed; -- sfixed point input
constant XMAP : STD_ULOGIC := '0') -- Map x to
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (s'range);
begin
if (s'length < 1) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& "TO_01(sfixed): null detected, returning NULL"
severity warning;
return NASF;
end if;
return to_fixed (to_01(to_s(s), XMAP), s'high, s'low);
end function to_01;
function Is_X (
arg : UNRESOLVED_ufixed)
return BOOLEAN
is
variable argslv : STD_ULOGIC_VECTOR (arg'length-1 downto 0); -- slv
begin
argslv := to_sulv(arg);
return Is_X (argslv);
end function Is_X;
function Is_X (
arg : UNRESOLVED_sfixed)
return BOOLEAN
is
variable argslv : STD_ULOGIC_VECTOR (arg'length-1 downto 0); -- slv
begin
argslv := to_sulv(arg);
return Is_X (argslv);
end function Is_X;
function To_X01 (
arg : UNRESOLVED_ufixed)
return UNRESOLVED_ufixed is
begin
return to_ufixed (To_X01(to_sulv(arg)), arg'high, arg'low);
end function To_X01;
function to_X01 (
arg : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed is
begin
return to_sfixed (To_X01(to_sulv(arg)), arg'high, arg'low);
end function To_X01;
function To_X01Z (
arg : UNRESOLVED_ufixed)
return UNRESOLVED_ufixed is
begin
return to_ufixed (To_X01Z(to_sulv(arg)), arg'high, arg'low);
end function To_X01Z;
function to_X01Z (
arg : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed is
begin
return to_sfixed (To_X01Z(to_sulv(arg)), arg'high, arg'low);
end function To_X01Z;
function To_UX01 (
arg : UNRESOLVED_ufixed)
return UNRESOLVED_ufixed is
begin
return to_ufixed (To_UX01(to_sulv(arg)), arg'high, arg'low);
end function To_UX01;
function to_UX01 (
arg : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed is
begin
return to_sfixed (To_UX01(to_sulv(arg)), arg'high, arg'low);
end function To_UX01;
function resize (
arg : UNRESOLVED_ufixed; -- input
constant left_index : INTEGER; -- integer portion
constant right_index : INTEGER; -- size of fraction
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_ufixed
is
constant arghigh : INTEGER := maximum (arg'high, arg'low);
constant arglow : INTEGER := mine (arg'high, arg'low);
variable invec : UNRESOLVED_ufixed (arghigh downto arglow);
variable result : UNRESOLVED_ufixed(left_index downto right_index) :=
(others => '0');
variable needs_rounding : BOOLEAN := false;
begin -- resize
if (arg'length < 1) or (result'length < 1) then
return NAUF;
elsif (invec'length < 1) then
return result; -- string literal value
else
invec := cleanvec(arg);
if (right_index > arghigh) then -- return top zeros
needs_rounding := (round_style = fixed_round) and
(right_index = arghigh+1);
elsif (left_index < arglow) then -- return overflow
if (overflow_style = fixed_saturate) and
(or(to_sulv(invec)) = '1') then
result := saturate (result'high, result'low); -- saturate
end if;
elsif (arghigh > left_index) then
-- wrap or saturate?
if (overflow_style = fixed_saturate and
or (to_sulv(invec(arghigh downto left_index+1))) = '1')
then
result := saturate (result'high, result'low); -- saturate
else
if (arglow >= right_index) then
result (left_index downto arglow) :=
invec(left_index downto arglow);
else
result (left_index downto right_index) :=
invec (left_index downto right_index);
needs_rounding := (round_style = fixed_round); -- round
end if;
end if;
else -- arghigh <= integer width
if (arglow >= right_index) then
result (arghigh downto arglow) := invec;
else
result (arghigh downto right_index) :=
invec (arghigh downto right_index);
needs_rounding := (round_style = fixed_round); -- round
end if;
end if;
-- Round result
if needs_rounding then
result := round_fixed (arg => result,
remainder => invec (right_index-1
downto arglow),
overflow_style => overflow_style);
end if;
return result;
end if;
end function resize;
function resize (
arg : UNRESOLVED_sfixed; -- input
constant left_index : INTEGER; -- integer portion
constant right_index : INTEGER; -- size of fraction
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_sfixed
is
constant arghigh : INTEGER := maximum (arg'high, arg'low);
constant arglow : INTEGER := mine (arg'high, arg'low);
variable invec : UNRESOLVED_sfixed (arghigh downto arglow);
variable result : UNRESOLVED_sfixed(left_index downto right_index) :=
(others => '0');
variable reduced : STD_ULOGIC;
variable needs_rounding : BOOLEAN := false; -- rounding
begin -- resize
if (arg'length < 1) or (result'length < 1) then
return NASF;
elsif (invec'length < 1) then
return result; -- string literal value
else
invec := cleanvec(arg);
if (right_index > arghigh) then -- return top zeros
if (arg'low /= INTEGER'low) then -- check for a literal
result := (others => arg(arghigh)); -- sign extend
end if;
needs_rounding := (round_style = fixed_round) and
(right_index = arghigh+1);
elsif (left_index < arglow) then -- return overflow
if (overflow_style = fixed_saturate) then
reduced := or (to_sulv(invec));
if (reduced = '1') then
if (invec(arghigh) = '0') then
-- saturate POSITIVE
result := saturate (result'high, result'low);
else
-- saturate negative
result := not saturate (result'high, result'low);
end if;
-- else return 0 (input was 0)
end if;
-- else return 0 (wrap)
end if;
elsif (arghigh > left_index) then
if (invec(arghigh) = '0') then
reduced := or (to_sulv(invec(arghigh-1 downto
left_index)));
if overflow_style = fixed_saturate and reduced = '1' then
-- saturate positive
result := saturate (result'high, result'low);
else
if (right_index > arglow) then
result := invec (left_index downto right_index);
needs_rounding := (round_style = fixed_round);
else
result (left_index downto arglow) :=
invec (left_index downto arglow);
end if;
end if;
else
reduced := and (to_sulv(invec(arghigh-1 downto
left_index)));
if overflow_style = fixed_saturate and reduced = '0' then
result := not saturate (result'high, result'low);
else
if (right_index > arglow) then
result := invec (left_index downto right_index);
needs_rounding := (round_style = fixed_round);
else
result (left_index downto arglow) :=
invec (left_index downto arglow);
end if;
end if;
end if;
else -- arghigh <= integer width
if (arglow >= right_index) then
result (arghigh downto arglow) := invec;
else
result (arghigh downto right_index) :=
invec (arghigh downto right_index);
needs_rounding := (round_style = fixed_round); -- round
end if;
if (left_index > arghigh) then -- sign extend
result(left_index downto arghigh+1) := (others => invec(arghigh));
end if;
end if;
-- Round result
if (needs_rounding) then
result := round_fixed (arg => result,
remainder => invec (right_index-1
downto arglow),
overflow_style => overflow_style);
end if;
return result;
end if;
end function resize;
-- size_res functions
-- These functions compute the size from a passed variable named "size_res"
-- The only part of this variable used it it's size, it is never passed
-- to a lower level routine.
function to_ufixed (
arg : STD_ULOGIC_VECTOR; -- shifted vector
size_res : UNRESOLVED_ufixed) -- for size only
return UNRESOLVED_ufixed
is
constant fw : INTEGER := mine (size_res'low, size_res'low); -- catch literals
variable result : UNRESOLVED_ufixed (size_res'left downto fw);
begin
if (result'length < 1 or arg'length < 1) then
return NAUF;
else
result := to_ufixed (arg => arg,
left_index => size_res'high,
right_index => size_res'low);
return result;
end if;
end function to_ufixed;
function to_sfixed (
arg : STD_ULOGIC_VECTOR; -- shifted vector
size_res : UNRESOLVED_sfixed) -- for size only
return UNRESOLVED_sfixed
is
constant fw : INTEGER := mine (size_res'low, size_res'low); -- catch literals
variable result : UNRESOLVED_sfixed (size_res'left downto fw);
begin
if (result'length < 1 or arg'length < 1) then
return NASF;
else
result := to_sfixed (arg => arg,
left_index => size_res'high,
right_index => size_res'low);
return result;
end if;
end function to_sfixed;
function to_ufixed (
arg : NATURAL; -- integer
size_res : UNRESOLVED_ufixed; -- for size only
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_ufixed
is
constant fw : INTEGER := mine (size_res'low, size_res'low); -- catch literals
variable result : UNRESOLVED_ufixed (size_res'left downto fw);
begin
if (result'length < 1) then
return NAUF;
else
result := to_ufixed (arg => arg,
left_index => size_res'high,
right_index => size_res'low,
round_style => round_style,
overflow_style => overflow_style);
return result;
end if;
end function to_ufixed;
function to_sfixed (
arg : INTEGER; -- integer
size_res : UNRESOLVED_sfixed; -- for size only
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_sfixed
is
constant fw : INTEGER := mine (size_res'low, size_res'low); -- catch literals
variable result : UNRESOLVED_sfixed (size_res'left downto fw);
begin
if (result'length < 1) then
return NASF;
else
result := to_sfixed (arg => arg,
left_index => size_res'high,
right_index => size_res'low,
round_style => round_style,
overflow_style => overflow_style);
return result;
end if;
end function to_sfixed;
function to_ufixed (
arg : REAL; -- real
size_res : UNRESOLVED_ufixed; -- for size only
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style;
constant guard_bits : NATURAL := fixed_guard_bits) -- # of guard bits
return UNRESOLVED_ufixed
is
constant fw : INTEGER := mine (size_res'low, size_res'low); -- catch literals
variable result : UNRESOLVED_ufixed (size_res'left downto fw);
begin
if (result'length < 1) then
return NAUF;
else
result := to_ufixed (arg => arg,
left_index => size_res'high,
right_index => size_res'low,
guard_bits => guard_bits,
round_style => round_style,
overflow_style => overflow_style);
return result;
end if;
end function to_ufixed;
function to_sfixed (
arg : REAL; -- real
size_res : UNRESOLVED_sfixed; -- for size only
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style;
constant guard_bits : NATURAL := fixed_guard_bits) -- # of guard bits
return UNRESOLVED_sfixed
is
constant fw : INTEGER := mine (size_res'low, size_res'low); -- catch literals
variable result : UNRESOLVED_sfixed (size_res'left downto fw);
begin
if (result'length < 1) then
return NASF;
else
result := to_sfixed (arg => arg,
left_index => size_res'high,
right_index => size_res'low,
guard_bits => guard_bits,
round_style => round_style,
overflow_style => overflow_style);
return result;
end if;
end function to_sfixed;
function to_ufixed (
arg : UNRESOLVED_UNSIGNED; -- unsigned
size_res : UNRESOLVED_ufixed; -- for size only
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_ufixed
is
constant fw : INTEGER := mine (size_res'low, size_res'low); -- catch literals
variable result : UNRESOLVED_ufixed (size_res'left downto fw);
begin
if (result'length < 1 or arg'length < 1) then
return NAUF;
else
result := to_ufixed (arg => arg,
left_index => size_res'high,
right_index => size_res'low,
round_style => round_style,
overflow_style => overflow_style);
return result;
end if;
end function to_ufixed;
function to_sfixed (
arg : UNRESOLVED_SIGNED; -- signed
size_res : UNRESOLVED_sfixed; -- for size only
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_sfixed
is
constant fw : INTEGER := mine (size_res'low, size_res'low); -- catch literals
variable result : UNRESOLVED_sfixed (size_res'left downto fw);
begin
if (result'length < 1 or arg'length < 1) then
return NASF;
else
result := to_sfixed (arg => arg,
left_index => size_res'high,
right_index => size_res'low,
round_style => round_style,
overflow_style => overflow_style);
return result;
end if;
end function to_sfixed;
function resize (
arg : UNRESOLVED_ufixed; -- input
size_res : UNRESOLVED_ufixed; -- for size only
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_ufixed
is
constant fw : INTEGER := mine (size_res'low, size_res'low); -- catch literals
variable result : UNRESOLVED_ufixed (size_res'high downto fw);
begin
if (result'length < 1 or arg'length < 1) then
return NAUF;
else
result := resize (arg => arg,
left_index => size_res'high,
right_index => size_res'low,
round_style => round_style,
overflow_style => overflow_style);
return result;
end if;
end function resize;
function resize (
arg : UNRESOLVED_sfixed; -- input
size_res : UNRESOLVED_sfixed; -- for size only
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_sfixed
is
constant fw : INTEGER := mine (size_res'low, size_res'low); -- catch literals
variable result : UNRESOLVED_sfixed (size_res'high downto fw);
begin
if (result'length < 1 or arg'length < 1) then
return NASF;
else
result := resize (arg => arg,
left_index => size_res'high,
right_index => size_res'low,
round_style => round_style,
overflow_style => overflow_style);
return result;
end if;
end function resize;
-- Overloaded math functions for real
function "+" (
l : UNRESOLVED_ufixed; -- fixed point input
r : REAL)
return UNRESOLVED_ufixed is
begin
return (l + to_ufixed (r, l'high, l'low));
end function "+";
function "+" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return (to_ufixed (l, r'high, r'low) + r);
end function "+";
function "+" (
l : UNRESOLVED_sfixed; -- fixed point input
r : REAL)
return UNRESOLVED_sfixed is
begin
return (l + to_sfixed (r, l'high, l'low));
end function "+";
function "+" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed is
begin
return (to_sfixed (l, r'high, r'low) + r);
end function "+";
function "-" (
l : UNRESOLVED_ufixed; -- fixed point input
r : REAL)
return UNRESOLVED_ufixed is
begin
return (l - to_ufixed (r, l'high, l'low));
end function "-";
function "-" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return (to_ufixed (l, r'high, r'low) - r);
end function "-";
function "-" (
l : UNRESOLVED_sfixed; -- fixed point input
r : REAL)
return UNRESOLVED_sfixed is
begin
return (l - to_sfixed (r, l'high, l'low));
end function "-";
function "-" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed is
begin
return (to_sfixed (l, r'high, r'low) - r);
end function "-";
function "*" (
l : UNRESOLVED_ufixed; -- fixed point input
r : REAL)
return UNRESOLVED_ufixed is
begin
return (l * to_ufixed (r, l'high, l'low));
end function "*";
function "*" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return (to_ufixed (l, r'high, r'low) * r);
end function "*";
function "*" (
l : UNRESOLVED_sfixed; -- fixed point input
r : REAL)
return UNRESOLVED_sfixed is
begin
return (l * to_sfixed (r, l'high, l'low));
end function "*";
function "*" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed is
begin
return (to_sfixed (l, r'high, r'low) * r);
end function "*";
function "/" (
l : UNRESOLVED_ufixed; -- fixed point input
r : REAL)
return UNRESOLVED_ufixed is
begin
return (l / to_ufixed (r, l'high, l'low));
end function "/";
function "/" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return (to_ufixed (l, r'high, r'low) / r);
end function "/";
function "/" (
l : UNRESOLVED_sfixed; -- fixed point input
r : REAL)
return UNRESOLVED_sfixed is
begin
return (l / to_sfixed (r, l'high, l'low));
end function "/";
function "/" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed is
begin
return (to_sfixed (l, r'high, r'low) / r);
end function "/";
function "rem" (
l : UNRESOLVED_ufixed; -- fixed point input
r : REAL)
return UNRESOLVED_ufixed is
begin
return (l rem to_ufixed (r, l'high, l'low));
end function "rem";
function "rem" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return (to_ufixed (l, r'high, r'low) rem r);
end function "rem";
function "rem" (
l : UNRESOLVED_sfixed; -- fixed point input
r : REAL)
return UNRESOLVED_sfixed is
begin
return (l rem to_sfixed (r, l'high, l'low));
end function "rem";
function "rem" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed is
begin
return (to_sfixed (l, r'high, r'low) rem r);
end function "rem";
function "mod" (
l : UNRESOLVED_ufixed; -- fixed point input
r : REAL)
return UNRESOLVED_ufixed is
begin
return (l mod to_ufixed (r, l'high, l'low));
end function "mod";
function "mod" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return (to_ufixed (l, r'high, r'low) mod r);
end function "mod";
function "mod" (
l : UNRESOLVED_sfixed; -- fixed point input
r : REAL)
return UNRESOLVED_sfixed is
begin
return (l mod to_sfixed (r, l'high, l'low));
end function "mod";
function "mod" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed is
begin
return (to_sfixed (l, r'high, r'low) mod r);
end function "mod";
-- Overloaded math functions for integers
function "+" (
l : UNRESOLVED_ufixed; -- fixed point input
r : NATURAL)
return UNRESOLVED_ufixed is
begin
return (l + to_ufixed (r, l'high, 0));
end function "+";
function "+" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return (to_ufixed (l, r'high, 0) + r);
end function "+";
function "+" (
l : UNRESOLVED_sfixed; -- fixed point input
r : INTEGER)
return UNRESOLVED_sfixed is
begin
return (l + to_sfixed (r, l'high, 0));
end function "+";
function "+" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed is
begin
return (to_sfixed (l, r'high, 0) + r);
end function "+";
-- Overloaded functions
function "-" (
l : UNRESOLVED_ufixed; -- fixed point input
r : NATURAL)
return UNRESOLVED_ufixed is
begin
return (l - to_ufixed (r, l'high, 0));
end function "-";
function "-" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return (to_ufixed (l, r'high, 0) - r);
end function "-";
function "-" (
l : UNRESOLVED_sfixed; -- fixed point input
r : INTEGER)
return UNRESOLVED_sfixed is
begin
return (l - to_sfixed (r, l'high, 0));
end function "-";
function "-" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed is
begin
return (to_sfixed (l, r'high, 0) - r);
end function "-";
-- Overloaded functions
function "*" (
l : UNRESOLVED_ufixed; -- fixed point input
r : NATURAL)
return UNRESOLVED_ufixed is
begin
return (l * to_ufixed (r, l'high, 0));
end function "*";
function "*" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return (to_ufixed (l, r'high, 0) * r);
end function "*";
function "*" (
l : UNRESOLVED_sfixed; -- fixed point input
r : INTEGER)
return UNRESOLVED_sfixed is
begin
return (l * to_sfixed (r, l'high, 0));
end function "*";
function "*" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed is
begin
return (to_sfixed (l, r'high, 0) * r);
end function "*";
-- Overloaded functions
function "/" (
l : UNRESOLVED_ufixed; -- fixed point input
r : NATURAL)
return UNRESOLVED_ufixed is
begin
return (l / to_ufixed (r, l'high, 0));
end function "/";
function "/" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return (to_ufixed (l, r'high, 0) / r);
end function "/";
function "/" (
l : UNRESOLVED_sfixed; -- fixed point input
r : INTEGER)
return UNRESOLVED_sfixed is
begin
return (l / to_sfixed (r, l'high, 0));
end function "/";
function "/" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed is
begin
return (to_sfixed (l, r'high, 0) / r);
end function "/";
function "rem" (
l : UNRESOLVED_ufixed; -- fixed point input
r : NATURAL)
return UNRESOLVED_ufixed is
begin
return (l rem to_ufixed (r, l'high, 0));
end function "rem";
function "rem" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return (to_ufixed (l, r'high, 0) rem r);
end function "rem";
function "rem" (
l : UNRESOLVED_sfixed; -- fixed point input
r : INTEGER)
return UNRESOLVED_sfixed is
begin
return (l rem to_sfixed (r, l'high, 0));
end function "rem";
function "rem" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed is
begin
return (to_sfixed (l, r'high, 0) rem r);
end function "rem";
function "mod" (
l : UNRESOLVED_ufixed; -- fixed point input
r : NATURAL)
return UNRESOLVED_ufixed is
begin
return (l mod to_ufixed (r, l'high, 0));
end function "mod";
function "mod" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return (to_ufixed (l, r'high, 0) mod r);
end function "mod";
function "mod" (
l : UNRESOLVED_sfixed; -- fixed point input
r : INTEGER)
return UNRESOLVED_sfixed is
begin
return (l mod to_sfixed (r, l'high, 0));
end function "mod";
function "mod" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed is
begin
return (to_sfixed (l, r'high, 0) mod r);
end function "mod";
-- overloaded ufixed compare functions with integer
function "=" (
l : UNRESOLVED_ufixed;
r : NATURAL) -- fixed point input
return BOOLEAN is
begin
return (l = to_ufixed (r, l'high, l'low));
end function "=";
function "/=" (
l : UNRESOLVED_ufixed;
r : NATURAL) -- fixed point input
return BOOLEAN is
begin
return (l /= to_ufixed (r, l'high, l'low));
end function "/=";
function ">=" (
l : UNRESOLVED_ufixed;
r : NATURAL) -- fixed point input
return BOOLEAN is
begin
return (l >= to_ufixed (r, l'high, l'low));
end function ">=";
function "<=" (
l : UNRESOLVED_ufixed;
r : NATURAL) -- fixed point input
return BOOLEAN is
begin
return (l <= to_ufixed (r, l'high, l'low));
end function "<=";
function ">" (
l : UNRESOLVED_ufixed;
r : NATURAL) -- fixed point input
return BOOLEAN is
begin
return (l > to_ufixed (r, l'high, l'low));
end function ">";
function "<" (
l : UNRESOLVED_ufixed;
r : NATURAL) -- fixed point input
return BOOLEAN is
begin
return (l < to_ufixed (r, l'high, l'low));
end function "<";
function "?=" (
l : UNRESOLVED_ufixed;
r : NATURAL) -- fixed point input
return STD_ULOGIC is
begin
return (l ?= to_ufixed (r, l'high, l'low));
end function "?=";
function "?/=" (
l : UNRESOLVED_ufixed;
r : NATURAL) -- fixed point input
return STD_ULOGIC is
begin
return (l ?/= to_ufixed (r, l'high, l'low));
end function "?/=";
function "?>=" (
l : UNRESOLVED_ufixed;
r : NATURAL) -- fixed point input
return STD_ULOGIC is
begin
return (l ?>= to_ufixed (r, l'high, l'low));
end function "?>=";
function "?<=" (
l : UNRESOLVED_ufixed;
r : NATURAL) -- fixed point input
return STD_ULOGIC is
begin
return (l ?<= to_ufixed (r, l'high, l'low));
end function "?<=";
function "?>" (
l : UNRESOLVED_ufixed;
r : NATURAL) -- fixed point input
return STD_ULOGIC is
begin
return (l ?> to_ufixed (r, l'high, l'low));
end function "?>";
function "?<" (
l : UNRESOLVED_ufixed;
r : NATURAL) -- fixed point input
return STD_ULOGIC is
begin
return (l ?< to_ufixed (r, l'high, l'low));
end function "?<";
function maximum (
l : UNRESOLVED_ufixed; -- fixed point input
r : NATURAL)
return UNRESOLVED_ufixed is
begin
return maximum (l, to_ufixed (r, l'high, l'low));
end function maximum;
function minimum (
l : UNRESOLVED_ufixed; -- fixed point input
r : NATURAL)
return UNRESOLVED_ufixed is
begin
return minimum (l, to_ufixed (r, l'high, l'low));
end function minimum;
-- NATURAL to ufixed
function "=" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN is
begin
return (to_ufixed (l, r'high, r'low) = r);
end function "=";
function "/=" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN is
begin
return (to_ufixed (l, r'high, r'low) /= r);
end function "/=";
function ">=" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN is
begin
return (to_ufixed (l, r'high, r'low) >= r);
end function ">=";
function "<=" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN is
begin
return (to_ufixed (l, r'high, r'low) <= r);
end function "<=";
function ">" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN is
begin
return (to_ufixed (l, r'high, r'low) > r);
end function ">";
function "<" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN is
begin
return (to_ufixed (l, r'high, r'low) < r);
end function "<";
function "?=" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_ufixed (l, r'high, r'low) ?= r);
end function "?=";
function "?/=" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_ufixed (l, r'high, r'low) ?/= r);
end function "?/=";
function "?>=" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_ufixed (l, r'high, r'low) ?>= r);
end function "?>=";
function "?<=" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_ufixed (l, r'high, r'low) ?<= r);
end function "?<=";
function "?>" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_ufixed (l, r'high, r'low) ?> r);
end function "?>";
function "?<" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_ufixed (l, r'high, r'low) ?< r);
end function "?<";
function maximum (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return maximum (to_ufixed (l, r'high, r'low), r);
end function maximum;
function minimum (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return minimum (to_ufixed (l, r'high, r'low), r);
end function minimum;
-- overloaded ufixed compare functions with real
function "=" (
l : UNRESOLVED_ufixed;
r : REAL)
return BOOLEAN is
begin
return (l = to_ufixed (r, l'high, l'low));
end function "=";
function "/=" (
l : UNRESOLVED_ufixed;
r : REAL)
return BOOLEAN is
begin
return (l /= to_ufixed (r, l'high, l'low));
end function "/=";
function ">=" (
l : UNRESOLVED_ufixed;
r : REAL)
return BOOLEAN is
begin
return (l >= to_ufixed (r, l'high, l'low));
end function ">=";
function "<=" (
l : UNRESOLVED_ufixed;
r : REAL)
return BOOLEAN is
begin
return (l <= to_ufixed (r, l'high, l'low));
end function "<=";
function ">" (
l : UNRESOLVED_ufixed;
r : REAL)
return BOOLEAN is
begin
return (l > to_ufixed (r, l'high, l'low));
end function ">";
function "<" (
l : UNRESOLVED_ufixed;
r : REAL)
return BOOLEAN is
begin
return (l < to_ufixed (r, l'high, l'low));
end function "<";
function "?=" (
l : UNRESOLVED_ufixed;
r : REAL)
return STD_ULOGIC is
begin
return (l ?= to_ufixed (r, l'high, l'low));
end function "?=";
function "?/=" (
l : UNRESOLVED_ufixed;
r : REAL)
return STD_ULOGIC is
begin
return (l ?/= to_ufixed (r, l'high, l'low));
end function "?/=";
function "?>=" (
l : UNRESOLVED_ufixed;
r : REAL)
return STD_ULOGIC is
begin
return (l ?>= to_ufixed (r, l'high, l'low));
end function "?>=";
function "?<=" (
l : UNRESOLVED_ufixed;
r : REAL)
return STD_ULOGIC is
begin
return (l ?<= to_ufixed (r, l'high, l'low));
end function "?<=";
function "?>" (
l : UNRESOLVED_ufixed;
r : REAL)
return STD_ULOGIC is
begin
return (l ?> to_ufixed (r, l'high, l'low));
end function "?>";
function "?<" (
l : UNRESOLVED_ufixed;
r : REAL)
return STD_ULOGIC is
begin
return (l ?< to_ufixed (r, l'high, l'low));
end function "?<";
function maximum (
l : UNRESOLVED_ufixed;
r : REAL)
return UNRESOLVED_ufixed is
begin
return maximum (l, to_ufixed (r, l'high, l'low));
end function maximum;
function minimum (
l : UNRESOLVED_ufixed;
r : REAL)
return UNRESOLVED_ufixed is
begin
return minimum (l, to_ufixed (r, l'high, l'low));
end function minimum;
-- real and ufixed
function "=" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN is
begin
return (to_ufixed (l, r'high, r'low) = r);
end function "=";
function "/=" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN is
begin
return (to_ufixed (l, r'high, r'low) /= r);
end function "/=";
function ">=" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN is
begin
return (to_ufixed (l, r'high, r'low) >= r);
end function ">=";
function "<=" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN is
begin
return (to_ufixed (l, r'high, r'low) <= r);
end function "<=";
function ">" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN is
begin
return (to_ufixed (l, r'high, r'low) > r);
end function ">";
function "<" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN is
begin
return (to_ufixed (l, r'high, r'low) < r);
end function "<";
function "?=" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_ufixed (l, r'high, r'low) ?= r);
end function "?=";
function "?/=" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_ufixed (l, r'high, r'low) ?/= r);
end function "?/=";
function "?>=" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_ufixed (l, r'high, r'low) ?>= r);
end function "?>=";
function "?<=" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_ufixed (l, r'high, r'low) ?<= r);
end function "?<=";
function "?>" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_ufixed (l, r'high, r'low) ?> r);
end function "?>";
function "?<" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_ufixed (l, r'high, r'low) ?< r);
end function "?<";
function maximum (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return maximum (to_ufixed (l, r'high, r'low), r);
end function maximum;
function minimum (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return minimum (to_ufixed (l, r'high, r'low), r);
end function minimum;
-- overloaded sfixed compare functions with integer
function "=" (
l : UNRESOLVED_sfixed;
r : INTEGER)
return BOOLEAN is
begin
return (l = to_sfixed (r, l'high, l'low));
end function "=";
function "/=" (
l : UNRESOLVED_sfixed;
r : INTEGER)
return BOOLEAN is
begin
return (l /= to_sfixed (r, l'high, l'low));
end function "/=";
function ">=" (
l : UNRESOLVED_sfixed;
r : INTEGER)
return BOOLEAN is
begin
return (l >= to_sfixed (r, l'high, l'low));
end function ">=";
function "<=" (
l : UNRESOLVED_sfixed;
r : INTEGER)
return BOOLEAN is
begin
return (l <= to_sfixed (r, l'high, l'low));
end function "<=";
function ">" (
l : UNRESOLVED_sfixed;
r : INTEGER)
return BOOLEAN is
begin
return (l > to_sfixed (r, l'high, l'low));
end function ">";
function "<" (
l : UNRESOLVED_sfixed;
r : INTEGER)
return BOOLEAN is
begin
return (l < to_sfixed (r, l'high, l'low));
end function "<";
function "?=" (
l : UNRESOLVED_sfixed;
r : INTEGER)
return STD_ULOGIC is
begin
return (l ?= to_sfixed (r, l'high, l'low));
end function "?=";
function "?/=" (
l : UNRESOLVED_sfixed;
r : INTEGER)
return STD_ULOGIC is
begin
return (l ?/= to_sfixed (r, l'high, l'low));
end function "?/=";
function "?>=" (
l : UNRESOLVED_sfixed;
r : INTEGER)
return STD_ULOGIC is
begin
return (l ?>= to_sfixed (r, l'high, l'low));
end function "?>=";
function "?<=" (
l : UNRESOLVED_sfixed;
r : INTEGER)
return STD_ULOGIC is
begin
return (l ?<= to_sfixed (r, l'high, l'low));
end function "?<=";
function "?>" (
l : UNRESOLVED_sfixed;
r : INTEGER)
return STD_ULOGIC is
begin
return (l ?> to_sfixed (r, l'high, l'low));
end function "?>";
function "?<" (
l : UNRESOLVED_sfixed;
r : INTEGER)
return STD_ULOGIC is
begin
return (l ?< to_sfixed (r, l'high, l'low));
end function "?<";
function maximum (
l : UNRESOLVED_sfixed;
r : INTEGER)
return UNRESOLVED_sfixed is
begin
return maximum (l, to_sfixed (r, l'high, l'low));
end function maximum;
function minimum (
l : UNRESOLVED_sfixed;
r : INTEGER)
return UNRESOLVED_sfixed is
begin
return minimum (l, to_sfixed (r, l'high, l'low));
end function minimum;
-- integer and sfixed
function "=" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN is
begin
return (to_sfixed (l, r'high, r'low) = r);
end function "=";
function "/=" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN is
begin
return (to_sfixed (l, r'high, r'low) /= r);
end function "/=";
function ">=" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN is
begin
return (to_sfixed (l, r'high, r'low) >= r);
end function ">=";
function "<=" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN is
begin
return (to_sfixed (l, r'high, r'low) <= r);
end function "<=";
function ">" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN is
begin
return (to_sfixed (l, r'high, r'low) > r);
end function ">";
function "<" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN is
begin
return (to_sfixed (l, r'high, r'low) < r);
end function "<";
function "?=" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_sfixed (l, r'high, r'low) ?= r);
end function "?=";
function "?/=" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_sfixed (l, r'high, r'low) ?/= r);
end function "?/=";
function "?>=" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_sfixed (l, r'high, r'low) ?>= r);
end function "?>=";
function "?<=" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_sfixed (l, r'high, r'low) ?<= r);
end function "?<=";
function "?>" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_sfixed (l, r'high, r'low) ?> r);
end function "?>";
function "?<" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_sfixed (l, r'high, r'low) ?< r);
end function "?<";
function maximum (
l : INTEGER;
r : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed is
begin
return maximum (to_sfixed (l, r'high, r'low), r);
end function maximum;
function minimum (
l : INTEGER;
r : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed is
begin
return minimum (to_sfixed (l, r'high, r'low), r);
end function minimum;
-- overloaded sfixed compare functions with real
function "=" (
l : UNRESOLVED_sfixed;
r : REAL)
return BOOLEAN is
begin
return (l = to_sfixed (r, l'high, l'low));
end function "=";
function "/=" (
l : UNRESOLVED_sfixed;
r : REAL)
return BOOLEAN is
begin
return (l /= to_sfixed (r, l'high, l'low));
end function "/=";
function ">=" (
l : UNRESOLVED_sfixed;
r : REAL)
return BOOLEAN is
begin
return (l >= to_sfixed (r, l'high, l'low));
end function ">=";
function "<=" (
l : UNRESOLVED_sfixed;
r : REAL)
return BOOLEAN is
begin
return (l <= to_sfixed (r, l'high, l'low));
end function "<=";
function ">" (
l : UNRESOLVED_sfixed;
r : REAL)
return BOOLEAN is
begin
return (l > to_sfixed (r, l'high, l'low));
end function ">";
function "<" (
l : UNRESOLVED_sfixed;
r : REAL)
return BOOLEAN is
begin
return (l < to_sfixed (r, l'high, l'low));
end function "<";
function "?=" (
l : UNRESOLVED_sfixed;
r : REAL)
return STD_ULOGIC is
begin
return (l ?= to_sfixed (r, l'high, l'low));
end function "?=";
function "?/=" (
l : UNRESOLVED_sfixed;
r : REAL)
return STD_ULOGIC is
begin
return (l ?/= to_sfixed (r, l'high, l'low));
end function "?/=";
function "?>=" (
l : UNRESOLVED_sfixed;
r : REAL)
return STD_ULOGIC is
begin
return (l ?>= to_sfixed (r, l'high, l'low));
end function "?>=";
function "?<=" (
l : UNRESOLVED_sfixed;
r : REAL)
return STD_ULOGIC is
begin
return (l ?<= to_sfixed (r, l'high, l'low));
end function "?<=";
function "?>" (
l : UNRESOLVED_sfixed;
r : REAL)
return STD_ULOGIC is
begin
return (l ?> to_sfixed (r, l'high, l'low));
end function "?>";
function "?<" (
l : UNRESOLVED_sfixed;
r : REAL)
return STD_ULOGIC is
begin
return (l ?< to_sfixed (r, l'high, l'low));
end function "?<";
function maximum (
l : UNRESOLVED_sfixed;
r : REAL)
return UNRESOLVED_sfixed is
begin
return maximum (l, to_sfixed (r, l'high, l'low));
end function maximum;
function minimum (
l : UNRESOLVED_sfixed;
r : REAL)
return UNRESOLVED_sfixed is
begin
return minimum (l, to_sfixed (r, l'high, l'low));
end function minimum;
-- REAL and sfixed
function "=" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN is
begin
return (to_sfixed (l, r'high, r'low) = r);
end function "=";
function "/=" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN is
begin
return (to_sfixed (l, r'high, r'low) /= r);
end function "/=";
function ">=" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN is
begin
return (to_sfixed (l, r'high, r'low) >= r);
end function ">=";
function "<=" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN is
begin
return (to_sfixed (l, r'high, r'low) <= r);
end function "<=";
function ">" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN is
begin
return (to_sfixed (l, r'high, r'low) > r);
end function ">";
function "<" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN is
begin
return (to_sfixed (l, r'high, r'low) < r);
end function "<";
function "?=" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_sfixed (l, r'high, r'low) ?= r);
end function "?=";
function "?/=" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_sfixed (l, r'high, r'low) ?/= r);
end function "?/=";
function "?>=" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_sfixed (l, r'high, r'low) ?>= r);
end function "?>=";
function "?<=" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_sfixed (l, r'high, r'low) ?<= r);
end function "?<=";
function "?>" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_sfixed (l, r'high, r'low) ?> r);
end function "?>";
function "?<" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_sfixed (l, r'high, r'low) ?< r);
end function "?<";
function maximum (
l : REAL;
r : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed is
begin
return maximum (to_sfixed (l, r'high, r'low), r);
end function maximum;
function minimum (
l : REAL;
r : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed is
begin
return minimum (to_sfixed (l, r'high, r'low), r);
end function minimum;
-- copied from std_logic_textio
type MVL9plus is ('U', 'X', '0', '1', 'Z', 'W', 'L', 'H', '-', error);
type char_indexed_by_MVL9 is array (STD_ULOGIC) of CHARACTER;
type MVL9_indexed_by_char is array (CHARACTER) of STD_ULOGIC;
type MVL9plus_indexed_by_char is array (CHARACTER) of MVL9plus;
constant MVL9_to_char : char_indexed_by_MVL9 := "UX01ZWLH-";
constant char_to_MVL9 : MVL9_indexed_by_char :=
('U' => 'U', 'X' => 'X', '0' => '0', '1' => '1', 'Z' => 'Z',
'W' => 'W', 'L' => 'L', 'H' => 'H', '-' => '-', others => 'U');
constant char_to_MVL9plus : MVL9plus_indexed_by_char :=
('U' => 'U', 'X' => 'X', '0' => '0', '1' => '1', 'Z' => 'Z',
'W' => 'W', 'L' => 'L', 'H' => 'H', '-' => '-', others => error);
constant NBSP : CHARACTER := CHARACTER'val(160); -- space character
constant NUS : STRING(2 to 1) := (others => ' ');
-- purpose: Skips white space
procedure skip_whitespace (
L : inout LINE) is
variable readOk : BOOLEAN;
variable c : CHARACTER;
begin
while L /= null and L.all'length /= 0 loop
c := l (l'left);
if (c = ' ' or c = NBSP or c = HT) then
read (l, c, readOk);
else
exit;
end if;
end loop;
end procedure skip_whitespace;
-- purpose: writes fixed point into a line
procedure write (
L : inout LINE; -- input line
VALUE : in UNRESOLVED_ufixed; -- fixed point input
JUSTIFIED : in SIDE := right;
FIELD : in WIDTH := 0) is
variable s : STRING(1 to value'length +1) := (others => ' ');
variable sindx : INTEGER;
begin -- function write Example: 0011.1100
sindx := 1;
for i in value'high downto value'low loop
if i = -1 then
s(sindx) := '.';
sindx := sindx + 1;
end if;
s(sindx) := MVL9_to_char(STD_ULOGIC(value(i)));
sindx := sindx + 1;
end loop;
write(l, s, justified, field);
end procedure write;
-- purpose: writes fixed point into a line
procedure write (
L : inout LINE; -- input line
VALUE : in UNRESOLVED_sfixed; -- fixed point input
JUSTIFIED : in SIDE := right;
FIELD : in WIDTH := 0) is
variable s : STRING(1 to value'length +1);
variable sindx : INTEGER;
begin -- function write Example: 0011.1100
sindx := 1;
for i in value'high downto value'low loop
if i = -1 then
s(sindx) := '.';
sindx := sindx + 1;
end if;
s(sindx) := MVL9_to_char(STD_ULOGIC(value(i)));
sindx := sindx + 1;
end loop;
write(l, s, justified, field);
end procedure write;
procedure READ(L : inout LINE;
VALUE : out UNRESOLVED_ufixed) is
-- Possible data: 00000.0000000
-- 000000000000
variable c : CHARACTER;
variable readOk : BOOLEAN;
variable i : INTEGER; -- index variable
variable mv : ufixed (VALUE'range);
variable lastu : BOOLEAN := false; -- last character was an "_"
variable founddot : BOOLEAN := false; -- found a "."
begin -- READ
VALUE := (VALUE'range => 'U');
Skip_whitespace (L);
if VALUE'length > 0 then -- non Null input string
read (l, c, readOk);
i := value'high;
while i >= VALUE'low loop
if readOk = false then -- Bail out if there was a bad read
report fixed_generic_pkg'instance_name & "READ(ufixed) "
& "End of string encountered"
severity error;
return;
elsif c = '_' then
if i = value'high then
report fixed_generic_pkg'instance_name & "READ(ufixed) "
& "String begins with an ""_""" severity error;
return;
elsif lastu then
report fixed_generic_pkg'instance_name & "READ(ufixed) "
& "Two underscores detected in input string ""__"""
severity error;
return;
else
lastu := true;
end if;
elsif c = '.' then -- binary point
if founddot then
report fixed_generic_pkg'instance_name & "READ(ufixed) "
& "Two binary points found in input string" severity error;
return;
elsif i /= -1 then -- Seperator in the wrong spot
report fixed_generic_pkg'instance_name & "READ(ufixed) "
& "Decimal point does not match number format "
severity error;
return;
end if;
founddot := true;
lastu := false;
elsif c = ' ' or c = NBSP or c = HT then -- reading done.
report fixed_generic_pkg'instance_name & "READ(ufixed) "
& "Short read, Space encounted in input string"
severity error;
return;
elsif char_to_MVL9plus(c) = error then
report fixed_generic_pkg'instance_name & "READ(ufixed) "
& "Character '" &
c & "' read, expected STD_ULOGIC literal."
severity error;
return;
else
mv(i) := char_to_MVL9(c);
i := i - 1;
if i < mv'low then
VALUE := mv;
return;
end if;
lastu := false;
end if;
read(L, c, readOk);
end loop;
end if;
end procedure READ;
procedure READ(L : inout LINE;
VALUE : out UNRESOLVED_ufixed;
GOOD : out BOOLEAN) is
-- Possible data: 00000.0000000
-- 000000000000
variable c : CHARACTER;
variable readOk : BOOLEAN;
variable mv : ufixed (VALUE'range);
variable i : INTEGER; -- index variable
variable lastu : BOOLEAN := false; -- last character was an "_"
variable founddot : BOOLEAN := false; -- found a "."
begin -- READ
VALUE := (VALUE'range => 'U');
Skip_whitespace (L);
if VALUE'length > 0 then
read (l, c, readOk);
i := value'high;
GOOD := false;
while i >= VALUE'low loop
if not readOk then -- Bail out if there was a bad read
return;
elsif c = '_' then
if i = value'high then -- Begins with an "_"
return;
elsif lastu then -- "__" detected
return;
else
lastu := true;
end if;
elsif c = '.' then -- binary point
if founddot then
return;
elsif i /= -1 then -- Seperator in the wrong spot
return;
end if;
founddot := true;
lastu := false;
elsif (char_to_MVL9plus(c) = error) then -- Illegal character/short read
return;
else
mv(i) := char_to_MVL9(c);
i := i - 1;
if i < mv'low then -- reading done
GOOD := true;
VALUE := mv;
return;
end if;
lastu := false;
end if;
read(L, c, readOk);
end loop;
else
GOOD := true; -- read into a null array
end if;
end procedure READ;
procedure READ(L : inout LINE;
VALUE : out UNRESOLVED_sfixed) is
variable c : CHARACTER;
variable readOk : BOOLEAN;
variable i : INTEGER; -- index variable
variable mv : sfixed (VALUE'range);
variable lastu : BOOLEAN := false; -- last character was an "_"
variable founddot : BOOLEAN := false; -- found a "."
begin -- READ
VALUE := (VALUE'range => 'U');
Skip_whitespace (L);
if VALUE'length > 0 then -- non Null input string
read (l, c, readOk);
i := value'high;
while i >= VALUE'low loop
if readOk = false then -- Bail out if there was a bad read
report fixed_generic_pkg'instance_name & "READ(sfixed) "
& "End of string encountered"
severity error;
return;
elsif c = '_' then
if i = value'high then
report fixed_generic_pkg'instance_name & "READ(sfixed) "
& "String begins with an ""_""" severity error;
return;
elsif lastu then
report fixed_generic_pkg'instance_name & "READ(sfixed) "
& "Two underscores detected in input string ""__"""
severity error;
return;
else
lastu := true;
end if;
elsif c = '.' then -- binary point
if founddot then
report fixed_generic_pkg'instance_name & "READ(sfixed) "
& "Two binary points found in input string" severity error;
return;
elsif i /= -1 then -- Seperator in the wrong spot
report fixed_generic_pkg'instance_name & "READ(sfixed) "
& "Decimal point does not match number format "
severity error;
return;
end if;
founddot := true;
lastu := false;
elsif c = ' ' or c = NBSP or c = HT then -- reading done.
report fixed_generic_pkg'instance_name & "READ(sfixed) "
& "Short read, Space encounted in input string"
severity error;
return;
elsif char_to_MVL9plus(c) = error then
report fixed_generic_pkg'instance_name & "READ(sfixed) "
& "Character '" &
c & "' read, expected STD_ULOGIC literal."
severity error;
return;
else
mv(i) := char_to_MVL9(c);
i := i - 1;
if i < mv'low then
VALUE := mv;
return;
end if;
lastu := false;
end if;
read(L, c, readOk);
end loop;
end if;
end procedure READ;
procedure READ(L : inout LINE;
VALUE : out UNRESOLVED_sfixed;
GOOD : out BOOLEAN) is
variable value_ufixed : UNRESOLVED_ufixed (VALUE'range);
begin -- READ
READ (L => L, VALUE => value_ufixed, GOOD => GOOD);
VALUE := UNRESOLVED_sfixed (value_ufixed);
end procedure READ;
-- octal read and write
procedure owrite (
L : inout LINE; -- input line
VALUE : in UNRESOLVED_ufixed; -- fixed point input
JUSTIFIED : in SIDE := right;
FIELD : in WIDTH := 0) is
begin -- Example 03.30
write (L => L,
VALUE => to_ostring (VALUE),
JUSTIFIED => JUSTIFIED,
FIELD => FIELD);
end procedure owrite;
procedure owrite (
L : inout LINE; -- input line
VALUE : in UNRESOLVED_sfixed; -- fixed point input
JUSTIFIED : in SIDE := right;
FIELD : in WIDTH := 0) is
begin -- Example 03.30
write (L => L,
VALUE => to_ostring (VALUE),
JUSTIFIED => JUSTIFIED,
FIELD => FIELD);
end procedure owrite;
-- Note that for Octal and Hex read, you can not start with a ".",
-- the read is for numbers formatted "A.BC". These routines go to
-- the nearest bounds, so "F.E" will fit into an sfixed (2 downto -3).
procedure Char2TriBits (C : CHARACTER;
RESULT : out STD_ULOGIC_VECTOR(2 downto 0);
GOOD : out BOOLEAN;
ISSUE_ERROR : in BOOLEAN) is
begin
case c is
when '0' => result := o"0"; good := true;
when '1' => result := o"1"; good := true;
when '2' => result := o"2"; good := true;
when '3' => result := o"3"; good := true;
when '4' => result := o"4"; good := true;
when '5' => result := o"5"; good := true;
when '6' => result := o"6"; good := true;
when '7' => result := o"7"; good := true;
when 'Z' => result := "ZZZ"; good := true;
when 'X' => result := "XXX"; good := true;
when others =>
assert not ISSUE_ERROR
report fixed_generic_pkg'instance_name
& "OREAD Error: Read a '" & c &
"', expected an Octal character (0-7)."
severity error;
result := "UUU";
good := false;
end case;
end procedure Char2TriBits;
-- purpose: Routines common to the OREAD routines
procedure OREAD_common (
L : inout LINE;
slv : out STD_ULOGIC_VECTOR;
igood : out BOOLEAN;
idex : out INTEGER;
constant bpoint : in INTEGER; -- binary point
constant message : in BOOLEAN;
constant smath : in BOOLEAN) is
-- purpose: error message routine
procedure errmes (
constant mess : in STRING) is -- error message
begin
if message then
if smath then
report fixed_generic_pkg'instance_name
& "OREAD(sfixed) "
& mess
severity error;
else
report fixed_generic_pkg'instance_name
& "OREAD(ufixed) "
& mess
severity error;
end if;
end if;
end procedure errmes;
variable xgood : BOOLEAN;
variable nybble : STD_ULOGIC_VECTOR (2 downto 0); -- 3 bits
variable c : CHARACTER;
variable i : INTEGER;
variable lastu : BOOLEAN := false; -- last character was an "_"
variable founddot : BOOLEAN := false; -- found a dot.
begin
Skip_whitespace (L);
if slv'length > 0 then
i := slv'high;
read (l, c, xgood);
while i > 0 loop
if xgood = false then
errmes ("Error: end of string encountered");
exit;
elsif c = '_' then
if i = slv'length then
errmes ("Error: String begins with an ""_""");
xgood := false;
exit;
elsif lastu then
errmes ("Error: Two underscores detected in input string ""__""");
xgood := false;
exit;
else
lastu := true;
end if;
elsif (c = '.') then
if (i + 1 /= bpoint) then
errmes ("encountered ""."" at wrong index");
xgood := false;
exit;
elsif i = slv'length then
errmes ("encounted a ""."" at the beginning of the line");
xgood := false;
exit;
elsif founddot then
errmes ("Two ""."" encounted in input string");
xgood := false;
exit;
end if;
founddot := true;
lastu := false;
else
Char2triBits(c, nybble, xgood, message);
if not xgood then
exit;
end if;
slv (i downto i-2) := nybble;
i := i - 3;
lastu := false;
end if;
if i > 0 then
read (L, c, xgood);
end if;
end loop;
idex := i;
igood := xgood;
else
igood := true; -- read into a null array
idex := -1;
end if;
end procedure OREAD_common;
-- Note that for Octal and Hex read, you can not start with a ".",
-- the read is for numbers formatted "A.BC". These routines go to
-- the nearest bounds, so "F.E" will fit into an sfixed (2 downto -3).
procedure OREAD (L : inout LINE;
VALUE : out UNRESOLVED_ufixed) is
constant hbv : INTEGER := (((maximum(3, (VALUE'high+1))+2)/3)*3)-1;
constant lbv : INTEGER := ((mine(0, VALUE'low)-2)/3)*3;
variable slv : STD_ULOGIC_VECTOR (hbv-lbv downto 0); -- high bits
variable valuex : UNRESOLVED_ufixed (hbv downto lbv);
variable igood : BOOLEAN;
variable i : INTEGER;
begin
VALUE := (VALUE'range => 'U');
OREAD_common ( L => L,
slv => slv,
igood => igood,
idex => i,
bpoint => -lbv,
message => true,
smath => false);
if igood then -- We did not get another error
if not ((i = -1) and -- We read everything, and high bits 0
(or (slv(hbv-lbv downto VALUE'high+1-lbv)) = '0')) then
report fixed_generic_pkg'instance_name
& "OREAD(ufixed): Vector truncated."
severity error;
else
if (or (slv(VALUE'low-lbv-1 downto 0)) = '1') then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& "OREAD(ufixed): Vector truncated"
severity warning;
end if;
valuex := to_ufixed (slv, hbv, lbv);
VALUE := valuex (VALUE'range);
end if;
end if;
end procedure OREAD;
procedure OREAD(L : inout LINE;
VALUE : out UNRESOLVED_ufixed;
GOOD : out BOOLEAN) is
constant hbv : INTEGER := (((maximum(3, (VALUE'high+1))+2)/3)*3)-1;
constant lbv : INTEGER := ((mine(0, VALUE'low)-2)/3)*3;
variable slv : STD_ULOGIC_VECTOR (hbv-lbv downto 0); -- high bits
variable valuex : UNRESOLVED_ufixed (hbv downto lbv);
variable igood : BOOLEAN;
variable i : INTEGER;
begin
VALUE := (VALUE'range => 'U');
OREAD_common ( L => L,
slv => slv,
igood => igood,
idex => i,
bpoint => -lbv,
message => false,
smath => false);
if (igood and -- We did not get another error
(i = -1) and -- We read everything, and high bits 0
(or (slv(hbv-lbv downto VALUE'high+1-lbv)) = '0')) then
valuex := to_ufixed (slv, hbv, lbv);
VALUE := valuex (VALUE'range);
good := true;
else
good := false;
end if;
end procedure OREAD;
procedure OREAD(L : inout LINE;
VALUE : out UNRESOLVED_sfixed) is
constant hbv : INTEGER := (((maximum(3, (VALUE'high+1))+2)/3)*3)-1;
constant lbv : INTEGER := ((mine(0, VALUE'low)-2)/3)*3;
variable slv : STD_ULOGIC_VECTOR (hbv-lbv downto 0); -- high bits
variable valuex : UNRESOLVED_sfixed (hbv downto lbv);
variable igood : BOOLEAN;
variable i : INTEGER;
begin
VALUE := (VALUE'range => 'U');
OREAD_common ( L => L,
slv => slv,
igood => igood,
idex => i,
bpoint => -lbv,
message => true,
smath => true);
if igood then -- We did not get another error
if not ((i = -1) and -- We read everything
((slv(VALUE'high-lbv) = '0' and -- sign bits = extra bits
or (slv(hbv-lbv downto VALUE'high+1-lbv)) = '0') or
(slv(VALUE'high-lbv) = '1' and
and (slv(hbv-lbv downto VALUE'high+1-lbv)) = '1'))) then
report fixed_generic_pkg'instance_name
& "OREAD(sfixed): Vector truncated."
severity error;
else
if (or (slv(VALUE'low-lbv-1 downto 0)) = '1') then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& "OREAD(sfixed): Vector truncated"
severity warning;
end if;
valuex := to_sfixed (slv, hbv, lbv);
VALUE := valuex (VALUE'range);
end if;
end if;
end procedure OREAD;
procedure OREAD(L : inout LINE;
VALUE : out UNRESOLVED_sfixed;
GOOD : out BOOLEAN) is
constant hbv : INTEGER := (((maximum(3, (VALUE'high+1))+2)/3)*3)-1;
constant lbv : INTEGER := ((mine(0, VALUE'low)-2)/3)*3;
variable slv : STD_ULOGIC_VECTOR (hbv-lbv downto 0); -- high bits
variable valuex : UNRESOLVED_sfixed (hbv downto lbv);
variable igood : BOOLEAN;
variable i : INTEGER;
begin
VALUE := (VALUE'range => 'U');
OREAD_common ( L => L,
slv => slv,
igood => igood,
idex => i,
bpoint => -lbv,
message => false,
smath => true);
if (igood -- We did not get another error
and (i = -1) -- We read everything
and ((slv(VALUE'high-lbv) = '0' and -- sign bits = extra bits
or (slv(hbv-lbv downto VALUE'high+1-lbv)) = '0') or
(slv(VALUE'high-lbv) = '1' and
and (slv(hbv-lbv downto VALUE'high+1-lbv)) = '1'))) then
valuex := to_sfixed (slv, hbv, lbv);
VALUE := valuex (VALUE'range);
good := true;
else
good := false;
end if;
end procedure OREAD;
-- hex read and write
procedure hwrite (
L : inout LINE; -- input line
VALUE : in UNRESOLVED_ufixed; -- fixed point input
JUSTIFIED : in SIDE := right;
FIELD : in WIDTH := 0) is
begin -- Example 03.30
write (L => L,
VALUE => to_hstring (VALUE),
JUSTIFIED => JUSTIFIED,
FIELD => FIELD);
end procedure hwrite;
-- purpose: writes fixed point into a line
procedure hwrite (
L : inout LINE; -- input line
VALUE : in UNRESOLVED_sfixed; -- fixed point input
JUSTIFIED : in SIDE := right;
FIELD : in WIDTH := 0) is
begin -- Example 03.30
write (L => L,
VALUE => to_hstring (VALUE),
JUSTIFIED => JUSTIFIED,
FIELD => FIELD);
end procedure hwrite;
-- Hex Read and Write procedures for STD_ULOGIC_VECTOR.
-- Modified from the original to be more forgiving.
procedure Char2QuadBits (C : CHARACTER;
RESULT : out STD_ULOGIC_VECTOR(3 downto 0);
GOOD : out BOOLEAN;
ISSUE_ERROR : in BOOLEAN) is
begin
case c is
when '0' => result := x"0"; good := true;
when '1' => result := x"1"; good := true;
when '2' => result := x"2"; good := true;
when '3' => result := x"3"; good := true;
when '4' => result := x"4"; good := true;
when '5' => result := x"5"; good := true;
when '6' => result := x"6"; good := true;
when '7' => result := x"7"; good := true;
when '8' => result := x"8"; good := true;
when '9' => result := x"9"; good := true;
when 'A' | 'a' => result := x"A"; good := true;
when 'B' | 'b' => result := x"B"; good := true;
when 'C' | 'c' => result := x"C"; good := true;
when 'D' | 'd' => result := x"D"; good := true;
when 'E' | 'e' => result := x"E"; good := true;
when 'F' | 'f' => result := x"F"; good := true;
when 'Z' => result := "ZZZZ"; good := true;
when 'X' => result := "XXXX"; good := true;
when others =>
assert not ISSUE_ERROR
report fixed_generic_pkg'instance_name
& "HREAD Error: Read a '" & c &
"', expected a Hex character (0-F)."
severity error;
result := "UUUU";
good := false;
end case;
end procedure Char2QuadBits;
-- purpose: Routines common to the HREAD routines
procedure HREAD_common (
L : inout LINE;
slv : out STD_ULOGIC_VECTOR;
igood : out BOOLEAN;
idex : out INTEGER;
constant bpoint : in INTEGER; -- binary point
constant message : in BOOLEAN;
constant smath : in BOOLEAN) is
-- purpose: error message routine
procedure errmes (
constant mess : in STRING) is -- error message
begin
if message then
if smath then
report fixed_generic_pkg'instance_name
& "HREAD(sfixed) "
& mess
severity error;
else
report fixed_generic_pkg'instance_name
& "HREAD(ufixed) "
& mess
severity error;
end if;
end if;
end procedure errmes;
variable xgood : BOOLEAN;
variable nybble : STD_ULOGIC_VECTOR (3 downto 0); -- 4 bits
variable c : CHARACTER;
variable i : INTEGER;
variable lastu : BOOLEAN := false; -- last character was an "_"
variable founddot : BOOLEAN := false; -- found a dot.
begin
Skip_whitespace (L);
if slv'length > 0 then
i := slv'high;
read (l, c, xgood);
while i > 0 loop
if xgood = false then
errmes ("Error: end of string encountered");
exit;
elsif c = '_' then
if i = slv'length then
errmes ("Error: String begins with an ""_""");
xgood := false;
exit;
elsif lastu then
errmes ("Error: Two underscores detected in input string ""__""");
xgood := false;
exit;
else
lastu := true;
end if;
elsif (c = '.') then
if (i + 1 /= bpoint) then
errmes ("encountered ""."" at wrong index");
xgood := false;
exit;
elsif i = slv'length then
errmes ("encounted a ""."" at the beginning of the line");
xgood := false;
exit;
elsif founddot then
errmes ("Two ""."" encounted in input string");
xgood := false;
exit;
end if;
founddot := true;
lastu := false;
else
Char2QuadBits(c, nybble, xgood, message);
if not xgood then
exit;
end if;
slv (i downto i-3) := nybble;
i := i - 4;
lastu := false;
end if;
if i > 0 then
read (L, c, xgood);
end if;
end loop;
idex := i;
igood := xgood;
else
idex := -1;
igood := true; -- read null string
end if;
end procedure HREAD_common;
procedure HREAD(L : inout LINE;
VALUE : out UNRESOLVED_ufixed) is
constant hbv : INTEGER := (((maximum(4, (VALUE'high+1))+3)/4)*4)-1;
constant lbv : INTEGER := ((mine(0, VALUE'low)-3)/4)*4;
variable slv : STD_ULOGIC_VECTOR (hbv-lbv downto 0); -- high bits
variable valuex : UNRESOLVED_ufixed (hbv downto lbv);
variable igood : BOOLEAN;
variable i : INTEGER;
begin
VALUE := (VALUE'range => 'U');
HREAD_common ( L => L,
slv => slv,
igood => igood,
idex => i,
bpoint => -lbv,
message => false,
smath => false);
if igood then
if not ((i = -1) and -- We read everything, and high bits 0
(or (slv(hbv-lbv downto VALUE'high+1-lbv)) = '0')) then
report fixed_generic_pkg'instance_name
& "HREAD(ufixed): Vector truncated."
severity error;
else
if (or (slv(VALUE'low-lbv-1 downto 0)) = '1') then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& "HREAD(ufixed): Vector truncated"
severity warning;
end if;
valuex := to_ufixed (slv, hbv, lbv);
VALUE := valuex (VALUE'range);
end if;
end if;
end procedure HREAD;
procedure HREAD(L : inout LINE;
VALUE : out UNRESOLVED_ufixed;
GOOD : out BOOLEAN) is
constant hbv : INTEGER := (((maximum(4, (VALUE'high+1))+3)/4)*4)-1;
constant lbv : INTEGER := ((mine(0, VALUE'low)-3)/4)*4;
variable slv : STD_ULOGIC_VECTOR (hbv-lbv downto 0); -- high bits
variable valuex : UNRESOLVED_ufixed (hbv downto lbv);
variable igood : BOOLEAN;
variable i : INTEGER;
begin
VALUE := (VALUE'range => 'U');
HREAD_common ( L => L,
slv => slv,
igood => igood,
idex => i,
bpoint => -lbv,
message => false,
smath => false);
if (igood and -- We did not get another error
(i = -1) and -- We read everything, and high bits 0
(or (slv(hbv-lbv downto VALUE'high+1-lbv)) = '0')) then
valuex := to_ufixed (slv, hbv, lbv);
VALUE := valuex (VALUE'range);
good := true;
else
good := false;
end if;
end procedure HREAD;
procedure HREAD(L : inout LINE;
VALUE : out UNRESOLVED_sfixed) is
constant hbv : INTEGER := (((maximum(4, (VALUE'high+1))+3)/4)*4)-1;
constant lbv : INTEGER := ((mine(0, VALUE'low)-3)/4)*4;
variable slv : STD_ULOGIC_VECTOR (hbv-lbv downto 0); -- high bits
variable valuex : UNRESOLVED_sfixed (hbv downto lbv);
variable igood : BOOLEAN;
variable i : INTEGER;
begin
VALUE := (VALUE'range => 'U');
HREAD_common ( L => L,
slv => slv,
igood => igood,
idex => i,
bpoint => -lbv,
message => true,
smath => true);
if igood then -- We did not get another error
if not ((i = -1) -- We read everything
and ((slv(VALUE'high-lbv) = '0' and -- sign bits = extra bits
or (slv(hbv-lbv downto VALUE'high+1-lbv)) = '0') or
(slv(VALUE'high-lbv) = '1' and
and (slv(hbv-lbv downto VALUE'high+1-lbv)) = '1'))) then
report fixed_generic_pkg'instance_name
& "HREAD(sfixed): Vector truncated."
severity error;
else
if (or (slv(VALUE'low-lbv-1 downto 0)) = '1') then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& "HREAD(sfixed): Vector truncated"
severity warning;
end if;
valuex := to_sfixed (slv, hbv, lbv);
VALUE := valuex (VALUE'range);
end if;
end if;
end procedure HREAD;
procedure HREAD(L : inout LINE;
VALUE : out UNRESOLVED_sfixed;
GOOD : out BOOLEAN) is
constant hbv : INTEGER := (((maximum(4, (VALUE'high+1))+3)/4)*4)-1;
constant lbv : INTEGER := ((mine(0, VALUE'low)-3)/4)*4;
variable slv : STD_ULOGIC_VECTOR (hbv-lbv downto 0); -- high bits
variable valuex : UNRESOLVED_sfixed (hbv downto lbv);
variable igood : BOOLEAN;
variable i : INTEGER;
begin
VALUE := (VALUE'range => 'U');
HREAD_common ( L => L,
slv => slv,
igood => igood,
idex => i,
bpoint => -lbv,
message => false,
smath => true);
if (igood and -- We did not get another error
(i = -1) and -- We read everything
((slv(VALUE'high-lbv) = '0' and -- sign bits = extra bits
or (slv(hbv-lbv downto VALUE'high+1-lbv)) = '0') or
(slv(VALUE'high-lbv) = '1' and
and (slv(hbv-lbv downto VALUE'high+1-lbv)) = '1'))) then
valuex := to_sfixed (slv, hbv, lbv);
VALUE := valuex (VALUE'range);
good := true;
else
good := false;
end if;
end procedure HREAD;
-- To_string functions. Useful in "report" statements.
-- Example: report "result was " & to_string(result);
function to_string (value : UNRESOLVED_ufixed) return STRING is
variable s : STRING(1 to value'length +1) := (others => ' ');
variable subval : UNRESOLVED_ufixed (value'high downto -1);
variable sindx : INTEGER;
begin
if value'length < 1 then
return NUS;
else
if value'high < 0 then
if value(value'high) = 'Z' then
return to_string (resize (sfixed(value), 0, value'low));
else
return to_string (resize (value, 0, value'low));
end if;
elsif value'low >= 0 then
if Is_X (value(value'low)) then
subval := (others => value(value'low));
subval (value'range) := value;
return to_string(subval);
else
return to_string (resize (value, value'high, -1));
end if;
else
sindx := 1;
for i in value'high downto value'low loop
if i = -1 then
s(sindx) := '.';
sindx := sindx + 1;
end if;
s(sindx) := MVL9_to_char(STD_ULOGIC(value(i)));
sindx := sindx + 1;
end loop;
return s;
end if;
end if;
end function to_string;
function to_string (value : UNRESOLVED_sfixed) return STRING is
variable s : STRING(1 to value'length + 1) := (others => ' ');
variable subval : UNRESOLVED_sfixed (value'high downto -1);
variable sindx : INTEGER;
begin
if value'length < 1 then
return NUS;
else
if value'high < 0 then
return to_string (resize (value, 0, value'low));
elsif value'low >= 0 then
if Is_X (value(value'low)) then
subval := (others => value(value'low));
subval (value'range) := value;
return to_string(subval);
else
return to_string (resize (value, value'high, -1));
end if;
else
sindx := 1;
for i in value'high downto value'low loop
if i = -1 then
s(sindx) := '.';
sindx := sindx + 1;
end if;
s(sindx) := MVL9_to_char(STD_ULOGIC(value(i)));
sindx := sindx + 1;
end loop;
return s;
end if;
end if;
end function to_string;
function to_ostring (value : UNRESOLVED_ufixed) return STRING is
constant lne : INTEGER := (-VALUE'low+2)/3;
variable subval : UNRESOLVED_ufixed (value'high downto -3);
variable lpad : STD_ULOGIC_VECTOR (0 to (lne*3 + VALUE'low) -1);
variable slv : STD_ULOGIC_VECTOR (value'length-1 downto 0);
begin
if value'length < 1 then
return NUS;
else
if value'high < 0 then
if value(value'high) = 'Z' then
return to_ostring (resize (sfixed(value), 2, value'low));
else
return to_ostring (resize (value, 2, value'low));
end if;
elsif value'low >= 0 then
if Is_X (value(value'low)) then
subval := (others => value(value'low));
subval (value'range) := value;
return to_ostring(subval);
else
return to_ostring (resize (value, value'high, -3));
end if;
else
slv := to_sulv (value);
if Is_X (value (value'low)) then
lpad := (others => value (value'low));
else
lpad := (others => '0');
end if;
return to_ostring(slv(slv'high downto slv'high-VALUE'high))
& "."
& to_ostring(slv(slv'high-VALUE'high-1 downto 0) & lpad);
end if;
end if;
end function to_ostring;
function to_hstring (value : UNRESOLVED_ufixed) return STRING is
constant lne : INTEGER := (-VALUE'low+3)/4;
variable subval : UNRESOLVED_ufixed (value'high downto -4);
variable lpad : STD_ULOGIC_VECTOR (0 to (lne*4 + VALUE'low) -1);
variable slv : STD_ULOGIC_VECTOR (value'length-1 downto 0);
begin
if value'length < 1 then
return NUS;
else
if value'high < 0 then
if value(value'high) = 'Z' then
return to_hstring (resize (sfixed(value), 3, value'low));
else
return to_hstring (resize (value, 3, value'low));
end if;
elsif value'low >= 0 then
if Is_X (value(value'low)) then
subval := (others => value(value'low));
subval (value'range) := value;
return to_hstring(subval);
else
return to_hstring (resize (value, value'high, -4));
end if;
else
slv := to_sulv (value);
if Is_X (value (value'low)) then
lpad := (others => value(value'low));
else
lpad := (others => '0');
end if;
return to_hstring(slv(slv'high downto slv'high-VALUE'high))
& "."
& to_hstring(slv(slv'high-VALUE'high-1 downto 0)&lpad);
end if;
end if;
end function to_hstring;
function to_ostring (value : UNRESOLVED_sfixed) return STRING is
constant ne : INTEGER := ((value'high+1)+2)/3;
variable pad : STD_ULOGIC_VECTOR(0 to (ne*3 - (value'high+1)) - 1);
constant lne : INTEGER := (-VALUE'low+2)/3;
variable subval : UNRESOLVED_sfixed (value'high downto -3);
variable lpad : STD_ULOGIC_VECTOR (0 to (lne*3 + VALUE'low) -1);
variable slv : STD_ULOGIC_VECTOR (VALUE'high - VALUE'low downto 0);
begin
if value'length < 1 then
return NUS;
else
if value'high < 0 then
return to_ostring (resize (value, 2, value'low));
elsif value'low >= 0 then
if Is_X (value(value'low)) then
subval := (others => value(value'low));
subval (value'range) := value;
return to_ostring(subval);
else
return to_ostring (resize (value, value'high, -3));
end if;
else
pad := (others => value(value'high));
slv := to_sulv (value);
if Is_X (value (value'low)) then
lpad := (others => value(value'low));
else
lpad := (others => '0');
end if;
return to_ostring(pad & slv(slv'high downto slv'high-VALUE'high))
& "."
& to_ostring(slv(slv'high-VALUE'high-1 downto 0) & lpad);
end if;
end if;
end function to_ostring;
function to_hstring (value : UNRESOLVED_sfixed) return STRING is
constant ne : INTEGER := ((value'high+1)+3)/4;
variable pad : STD_ULOGIC_VECTOR(0 to (ne*4 - (value'high+1)) - 1);
constant lne : INTEGER := (-VALUE'low+3)/4;
variable subval : UNRESOLVED_sfixed (value'high downto -4);
variable lpad : STD_ULOGIC_VECTOR (0 to (lne*4 + VALUE'low) -1);
variable slv : STD_ULOGIC_VECTOR (value'length-1 downto 0);
begin
if value'length < 1 then
return NUS;
else
if value'high < 0 then
return to_hstring (resize (value, 3, value'low));
elsif value'low >= 0 then
if Is_X (value(value'low)) then
subval := (others => value(value'low));
subval (value'range) := value;
return to_hstring(subval);
else
return to_hstring (resize (value, value'high, -4));
end if;
else
slv := to_sulv (value);
pad := (others => value(value'high));
if Is_X (value (value'low)) then
lpad := (others => value(value'low));
else
lpad := (others => '0');
end if;
return to_hstring(pad & slv(slv'high downto slv'high-VALUE'high))
& "."
& to_hstring(slv(slv'high-VALUE'high-1 downto 0) & lpad);
end if;
end if;
end function to_hstring;
-- From string functions allow you to convert a string into a fixed
-- point number. Example:
-- signal uf1 : ufixed (3 downto -3);
-- uf1 <= from_string ("0110.100", uf1'high, uf1'low); -- 6.5
-- The "." is optional in this syntax, however it exist and is
-- in the wrong location an error is produced. Overflow will
-- result in saturation.
function from_string (
bstring : STRING; -- binary string
constant left_index : INTEGER;
constant right_index : INTEGER)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (left_index downto right_index);
variable L : LINE;
variable good : BOOLEAN;
begin
L := new STRING'(bstring);
read (L, result, good);
deallocate (L);
assert (good)
report fixed_generic_pkg'instance_name
& "from_string: Bad string "& bstring severity error;
return result;
end function from_string;
-- Octal and hex conversions work as follows:
-- uf1 <= from_hstring ("6.8", 3, -3); -- 6.5 (bottom zeros dropped)
-- uf1 <= from_ostring ("06.4", 3, -3); -- 6.5 (top zeros dropped)
function from_ostring (
ostring : STRING; -- Octal string
constant left_index : INTEGER;
constant right_index : INTEGER)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (left_index downto right_index);
variable L : LINE;
variable good : BOOLEAN;
begin
L := new STRING'(ostring);
oread (L, result, good);
deallocate (L);
assert (good)
report fixed_generic_pkg'instance_name
& "from_ostring: Bad string "& ostring severity error;
return result;
end function from_ostring;
function from_hstring (
hstring : STRING; -- hex string
constant left_index : INTEGER;
constant right_index : INTEGER)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (left_index downto right_index);
variable L : LINE;
variable good : BOOLEAN;
begin
L := new STRING'(hstring);
hread (L, result, good);
deallocate (L);
assert (good)
report fixed_generic_pkg'instance_name
& "from_hstring: Bad string "& hstring severity error;
return result;
end function from_hstring;
function from_string (
bstring : STRING; -- binary string
constant left_index : INTEGER;
constant right_index : INTEGER)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (left_index downto right_index);
variable L : LINE;
variable good : BOOLEAN;
begin
L := new STRING'(bstring);
read (L, result, good);
deallocate (L);
assert (good)
report fixed_generic_pkg'instance_name
& "from_string: Bad string "& bstring severity error;
return result;
end function from_string;
function from_ostring (
ostring : STRING; -- Octal string
constant left_index : INTEGER;
constant right_index : INTEGER)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (left_index downto right_index);
variable L : LINE;
variable good : BOOLEAN;
begin
L := new STRING'(ostring);
oread (L, result, good);
deallocate (L);
assert (good)
report fixed_generic_pkg'instance_name
& "from_ostring: Bad string "& ostring severity error;
return result;
end function from_ostring;
function from_hstring (
hstring : STRING; -- hex string
constant left_index : INTEGER;
constant right_index : INTEGER)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (left_index downto right_index);
variable L : LINE;
variable good : BOOLEAN;
begin
L := new STRING'(hstring);
hread (L, result, good);
deallocate (L);
assert (good)
report fixed_generic_pkg'instance_name
& "from_hstring: Bad string "& hstring severity error;
return result;
end function from_hstring;
-- Same as above, "size_res" is used for it's range only.
function from_string (
bstring : STRING; -- binary string
size_res : UNRESOLVED_ufixed)
return UNRESOLVED_ufixed is
begin
return from_string (bstring, size_res'high, size_res'low);
end function from_string;
function from_ostring (
ostring : STRING; -- Octal string
size_res : UNRESOLVED_ufixed)
return UNRESOLVED_ufixed is
begin
return from_ostring (ostring, size_res'high, size_res'low);
end function from_ostring;
function from_hstring (
hstring : STRING; -- hex string
size_res : UNRESOLVED_ufixed)
return UNRESOLVED_ufixed is
begin
return from_hstring(hstring, size_res'high, size_res'low);
end function from_hstring;
function from_string (
bstring : STRING; -- binary string
size_res : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed is
begin
return from_string (bstring, size_res'high, size_res'low);
end function from_string;
function from_ostring (
ostring : STRING; -- Octal string
size_res : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed is
begin
return from_ostring (ostring, size_res'high, size_res'low);
end function from_ostring;
function from_hstring (
hstring : STRING; -- hex string
size_res : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed is
begin
return from_hstring (hstring, size_res'high, size_res'low);
end function from_hstring;
-- Direct conversion functions. Example:
-- signal uf1 : ufixed (3 downto -3);
-- uf1 <= from_string ("0110.100"); -- 6.5
-- In this case the "." is not optional, and the size of
-- the output must match exactly.
-- purpose: Calculate the string boundaries
procedure calculate_string_boundry (
arg : in STRING; -- input string
left_index : out INTEGER; -- left
right_index : out INTEGER) is -- right
-- examples "10001.111" would return +4, -3
-- "07X.44" would return +2, -2 (then the octal routine would multiply)
-- "A_B_._C" would return +1, -1 (then the hex routine would multiply)
alias xarg : STRING (arg'length downto 1) is arg; -- make it downto range
variable l, r : INTEGER; -- internal indexes
variable founddot : BOOLEAN := false;
begin
if arg'length > 0 then
l := xarg'high - 1;
r := 0;
for i in xarg'range loop
if xarg(i) = '_' then
if r = 0 then
l := l - 1;
else
r := r + 1;
end if;
elsif xarg(i) = ' ' or xarg(i) = NBSP or xarg(i) = HT then
report fixed_generic_pkg'instance_name
& "Found a space in the input STRING " & xarg
severity error;
elsif xarg(i) = '.' then
if founddot then
report fixed_generic_pkg'instance_name
& "Found two binary points in input string " & xarg
severity error;
else
l := l - i;
r := -i + 1;
founddot := true;
end if;
end if;
end loop;
left_index := l;
right_index := r;
else
left_index := 0;
right_index := 0;
end if;
end procedure calculate_string_boundry;
-- Direct conversion functions. Example:
-- signal uf1 : ufixed (3 downto -3);
-- uf1 <= from_string ("0110.100"); -- 6.5
-- In this case the "." is not optional, and the size of
-- the output must match exactly.
function from_string (
bstring : STRING) -- binary string
return UNRESOLVED_ufixed
is
variable left_index, right_index : INTEGER;
begin
calculate_string_boundry (bstring, left_index, right_index);
return from_string (bstring, left_index, right_index);
end function from_string;
-- Direct octal and hex conversion functions. In this case
-- the string lengths must match. Example:
-- signal sf1 := sfixed (5 downto -3);
-- sf1 <= from_ostring ("71.4") -- -6.5
function from_ostring (
ostring : STRING) -- Octal string
return UNRESOLVED_ufixed
is
variable left_index, right_index : INTEGER;
begin
calculate_string_boundry (ostring, left_index, right_index);
return from_ostring (ostring, ((left_index+1)*3)-1, right_index*3);
end function from_ostring;
function from_hstring (
hstring : STRING) -- hex string
return UNRESOLVED_ufixed
is
variable left_index, right_index : INTEGER;
begin
calculate_string_boundry (hstring, left_index, right_index);
return from_hstring (hstring, ((left_index+1)*4)-1, right_index*4);
end function from_hstring;
function from_string (
bstring : STRING) -- binary string
return UNRESOLVED_sfixed
is
variable left_index, right_index : INTEGER;
begin
calculate_string_boundry (bstring, left_index, right_index);
return from_string (bstring, left_index, right_index);
end function from_string;
function from_ostring (
ostring : STRING) -- Octal string
return UNRESOLVED_sfixed
is
variable left_index, right_index : INTEGER;
begin
calculate_string_boundry (ostring, left_index, right_index);
return from_ostring (ostring, ((left_index+1)*3)-1, right_index*3);
end function from_ostring;
function from_hstring (
hstring : STRING) -- hex string
return UNRESOLVED_sfixed
is
variable left_index, right_index : INTEGER;
begin
calculate_string_boundry (hstring, left_index, right_index);
return from_hstring (hstring, ((left_index+1)*4)-1, right_index*4);
end function from_hstring;
end package body fixed_generic_pkg;
|
-- --------------------------------------------------------------------
--
-- Copyright © 2008 by IEEE. All rights reserved.
--
-- This source file is an essential part of IEEE Std 1076-2008,
-- IEEE Standard VHDL Language Reference Manual. This source file may not be
-- copied, sold, or included with software that is sold without written
-- permission from the IEEE Standards Department. This source file may be
-- copied for individual use between licensed users. This source file is
-- provided on an AS IS basis. The IEEE disclaims ANY WARRANTY EXPRESS OR
-- IMPLIED INCLUDING ANY WARRANTY OF MERCHANTABILITY AND FITNESS FOR USE
-- FOR A PARTICULAR PURPOSE. The user of the source file shall indemnify
-- and hold IEEE harmless from any damages or liability arising out of the
-- use thereof.
--
-- Title : Fixed-point package (Generic package body)
-- :
-- Library : This package shall be compiled into a library
-- : symbolically named IEEE.
-- :
-- Developers: Accellera VHDL-TC and IEEE P1076 Working Group
-- :
-- Purpose : This packages defines basic binary fixed point arithmetic
-- : arithmetic functions
-- :
-- Note : This package may be modified to include additional data
-- : required by tools, but it must in no way change the
-- : external interfaces or simulation behavior of the
-- : description. It is permissible to add comments and/or
-- : attributes to the package declarations, but not to change
-- : or delete any original lines of the package declaration.
-- : The package body may be changed only in accordance with
-- : the terms of Clause 16 of this standard.
-- :
-- --------------------------------------------------------------------
-- $Revision: 1220 $
-- $Date: 2008-04-10 17:16:09 +0930 (Thu, 10 Apr 2008) $
-- --------------------------------------------------------------------
library IEEE;
use IEEE.MATH_REAL.all;
package body fixed_generic_pkg is
-- Author David Bishop (dbishop@vhdl.org)
-- Other contributers: Jim Lewis, Yannick Grugni, Ryan W. Hilton
-- null array constants
constant NAUF : UNRESOLVED_ufixed (0 downto 1) := (others => '0');
constant NASF : UNRESOLVED_sfixed (0 downto 1) := (others => '0');
constant NSLV : STD_ULOGIC_VECTOR (0 downto 1) := (others => '0');
-- This differed constant will tell you if the package body is synthesizable
-- or implemented as real numbers, set to "true" if synthesizable.
constant fixedsynth_or_real : BOOLEAN := true;
-- Special version of "minimum" to do some boundary checking without errors
function mins (l, r : INTEGER)
return INTEGER is
begin -- function mins
if (L = INTEGER'low or R = INTEGER'low) then
return 0; -- error condition, silent
end if;
return minimum (L, R);
end function mins;
-- Special version of "minimum" to do some boundary checking with errors
function mine (l, r : INTEGER)
return INTEGER is
begin -- function mine
if (L = INTEGER'low or R = INTEGER'low) then
report fixed_generic_pkg'instance_name
& " Unbounded number passed, was a literal used?"
severity error;
return 0;
end if;
return minimum (L, R);
end function mine;
-- The following functions are used only internally. Every function
-- calls "cleanvec" either directly or indirectly.
-- purpose: Fixes "downto" problem and resolves meta states
function cleanvec (
arg : UNRESOLVED_sfixed) -- input
return UNRESOLVED_sfixed
is
constant left_index : INTEGER := maximum(arg'left, arg'right);
constant right_index : INTEGER := mins(arg'left, arg'right);
variable result : UNRESOLVED_sfixed (arg'range);
begin -- function cleanvec
assert not (arg'ascending and (arg'low /= INTEGER'low))
report fixed_generic_pkg'instance_name
& " Vector passed using a ""to"" range, expected is ""downto"""
severity error;
return arg;
end function cleanvec;
-- purpose: Fixes "downto" problem and resolves meta states
function cleanvec (
arg : UNRESOLVED_ufixed) -- input
return UNRESOLVED_ufixed
is
constant left_index : INTEGER := maximum(arg'left, arg'right);
constant right_index : INTEGER := mins(arg'left, arg'right);
variable result : UNRESOLVED_ufixed (arg'range);
begin -- function cleanvec
assert not (arg'ascending and (arg'low /= INTEGER'low))
report fixed_generic_pkg'instance_name
& " Vector passed using a ""to"" range, expected is ""downto"""
severity error;
return arg;
end function cleanvec;
-- Type convert a "unsigned" into a "ufixed", used internally
function to_fixed (
arg : UNRESOLVED_UNSIGNED; -- shifted vector
constant left_index : INTEGER;
constant right_index : INTEGER)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (left_index downto right_index);
begin -- function to_fixed
result := UNRESOLVED_ufixed(arg);
return result;
end function to_fixed;
-- Type convert a "signed" into an "sfixed", used internally
function to_fixed (
arg : UNRESOLVED_SIGNED; -- shifted vector
constant left_index : INTEGER;
constant right_index : INTEGER)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (left_index downto right_index);
begin -- function to_fixed
result := UNRESOLVED_sfixed(arg);
return result;
end function to_fixed;
-- Type convert a "ufixed" into an "unsigned", used internally
function to_uns (
arg : UNRESOLVED_ufixed) -- fp vector
return UNRESOLVED_UNSIGNED
is
subtype t is UNRESOLVED_UNSIGNED(arg'high - arg'low downto 0);
variable slv : t;
begin -- function to_uns
slv := t(arg);
return slv;
end function to_uns;
-- Type convert an "sfixed" into a "signed", used internally
function to_s (
arg : UNRESOLVED_sfixed) -- fp vector
return UNRESOLVED_SIGNED
is
subtype t is UNRESOLVED_SIGNED(arg'high - arg'low downto 0);
variable slv : t;
begin -- function to_s
slv := t(arg);
return slv;
end function to_s;
-- adds 1 to the LSB of the number
procedure round_up (arg : in UNRESOLVED_ufixed;
result : out UNRESOLVED_ufixed;
overflowx : out BOOLEAN) is
variable arguns, resuns : UNRESOLVED_UNSIGNED (arg'high-arg'low+1 downto 0)
:= (others => '0');
begin -- round_up
arguns (arguns'high-1 downto 0) := to_uns (arg);
resuns := arguns + 1;
result := to_fixed(resuns(arg'high-arg'low
downto 0), arg'high, arg'low);
overflowx := (resuns(resuns'high) = '1');
end procedure round_up;
-- adds 1 to the LSB of the number
procedure round_up (arg : in UNRESOLVED_sfixed;
result : out UNRESOLVED_sfixed;
overflowx : out BOOLEAN) is
variable args, ress : UNRESOLVED_SIGNED (arg'high-arg'low+1 downto 0);
begin -- round_up
args (args'high-1 downto 0) := to_s (arg);
args(args'high) := arg(arg'high); -- sign extend
ress := args + 1;
result := to_fixed(ress (ress'high-1
downto 0), arg'high, arg'low);
overflowx := ((arg(arg'high) /= ress(ress'high-1))
and (or (STD_ULOGIC_VECTOR(ress)) /= '0'));
end procedure round_up;
-- Rounding - Performs a "round_nearest" (IEEE 754) which rounds up
-- when the remainder is > 0.5. If the remainder IS 0.5 then if the
-- bottom bit is a "1" it is rounded, otherwise it remains the same.
function round_fixed (arg : UNRESOLVED_ufixed;
remainder : UNRESOLVED_ufixed;
overflow_style : fixed_overflow_style_type := fixed_overflow_style)
return UNRESOLVED_ufixed
is
variable rounds : BOOLEAN;
variable round_overflow : BOOLEAN;
variable result : UNRESOLVED_ufixed (arg'range);
begin
rounds := false;
if (remainder'length > 1) then
if (remainder (remainder'high) = '1') then
rounds := (arg(arg'low) = '1')
or (or (to_sulv(remainder(remainder'high-1 downto
remainder'low))) = '1');
end if;
else
rounds := (arg(arg'low) = '1') and (remainder (remainder'high) = '1');
end if;
if rounds then
round_up(arg => arg,
result => result,
overflowx => round_overflow);
else
result := arg;
end if;
if (overflow_style = fixed_saturate) and round_overflow then
result := saturate (result'high, result'low);
end if;
return result;
end function round_fixed;
-- Rounding case statement
function round_fixed (arg : UNRESOLVED_sfixed;
remainder : UNRESOLVED_sfixed;
overflow_style : fixed_overflow_style_type := fixed_overflow_style)
return UNRESOLVED_sfixed
is
variable rounds : BOOLEAN;
variable round_overflow : BOOLEAN;
variable result : UNRESOLVED_sfixed (arg'range);
begin
rounds := false;
if (remainder'length > 1) then
if (remainder (remainder'high) = '1') then
rounds := (arg(arg'low) = '1')
or (or (to_sulv(remainder(remainder'high-1 downto
remainder'low))) = '1');
end if;
else
rounds := (arg(arg'low) = '1') and (remainder (remainder'high) = '1');
end if;
if rounds then
round_up(arg => arg,
result => result,
overflowx => round_overflow);
else
result := arg;
end if;
if round_overflow then
if (overflow_style = fixed_saturate) then
if arg(arg'high) = '0' then
result := saturate (result'high, result'low);
else
result := not saturate (result'high, result'low);
end if;
-- Sign bit not fixed when wrapping
end if;
end if;
return result;
end function round_fixed;
-- converts an sfixed into a ufixed. The output is the same length as the
-- input, because abs("1000") = "1000" = 8.
function to_ufixed (
arg : UNRESOLVED_sfixed)
return UNRESOLVED_ufixed
is
constant left_index : INTEGER := arg'high;
constant right_index : INTEGER := mine(arg'low, arg'low);
variable xarg : UNRESOLVED_sfixed(left_index+1 downto right_index);
variable result : UNRESOLVED_ufixed(left_index downto right_index);
begin
if arg'length < 1 then
return NAUF;
end if;
xarg := abs(arg);
result := UNRESOLVED_ufixed (xarg (left_index downto right_index));
return result;
end function to_ufixed;
-----------------------------------------------------------------------------
-- Visible functions
-----------------------------------------------------------------------------
-- Conversion functions. These are needed for synthesis where typically
-- the only input and output type is a std_logic_vector.
function to_sulv (
arg : UNRESOLVED_ufixed) -- fixed point vector
return STD_ULOGIC_VECTOR
is
subtype result_subtype is STD_ULOGIC_VECTOR (arg'length-1 downto 0);
variable result : result_subtype;
begin
if arg'length < 1 then
return NSLV;
end if;
result := result_subtype (arg);
return result;
end function to_sulv;
function to_sulv (
arg : UNRESOLVED_sfixed) -- fixed point vector
return STD_ULOGIC_VECTOR
is
subtype result_subtype is STD_ULOGIC_VECTOR (arg'length-1 downto 0);
variable result : result_subtype;
--variable result : STD_ULOGIC_VECTOR (arg'length-1 downto 0);
begin
if arg'length < 1 then
return NSLV;
end if;
--result := STD_ULOGIC_VECTOR (arg);
result := result_subtype (arg);
return result;
end function to_sulv;
function to_slv (
arg : UNRESOLVED_ufixed) -- fixed point vector
return STD_LOGIC_VECTOR is
begin
return to_sulv(arg);
end function to_slv;
function to_slv (
arg : UNRESOLVED_sfixed) -- fixed point vector
return STD_LOGIC_VECTOR is
begin
return to_sulv(arg);
end function to_slv;
function to_ufixed (
arg : STD_ULOGIC_VECTOR; -- shifted vector
constant left_index : INTEGER;
constant right_index : INTEGER)
return unresolved_ufixed
is
variable result : UNRESOLVED_ufixed (left_index downto right_index);
begin
if (arg'length < 1 or right_index > left_index) then
return NAUF;
end if;
if (arg'length /= result'length) then
report fixed_generic_pkg'instance_name & "TO_UFIXED(SLV) "
& "Vector lengths do not match. Input length is "
& INTEGER'image(arg'length) & " and output will be "
& INTEGER'image(result'length) & " wide."
severity error;
return NAUF;
else
result := to_fixed (arg => UNRESOLVED_UNSIGNED(arg),
left_index => left_index,
right_index => right_index);
return result;
end if;
end function to_ufixed;
function to_sfixed (
arg : STD_ULOGIC_VECTOR; -- shifted vector
constant left_index : INTEGER;
constant right_index : INTEGER)
return unresolved_sfixed
is
variable result : UNRESOLVED_sfixed (left_index downto right_index);
begin
if (arg'length < 1 or right_index > left_index) then
return NASF;
end if;
if (arg'length /= result'length) then
report fixed_generic_pkg'instance_name & "TO_SFIXED(SLV) "
& "Vector lengths do not match. Input length is "
& INTEGER'image(arg'length) & " and output will be "
& INTEGER'image(result'length) & " wide."
severity error;
return NASF;
else
result := to_fixed (arg => UNRESOLVED_SIGNED(arg),
left_index => left_index,
right_index => right_index);
return result;
end if;
end function to_sfixed;
-- Two's complement number, Grows the vector by 1 bit.
-- because "abs (1000.000) = 01000.000" or abs(-16) = 16.
function "abs" (
arg : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed
is
constant left_index : INTEGER := arg'high;
constant right_index : INTEGER := mine(arg'low, arg'low);
variable ressns : UNRESOLVED_SIGNED (arg'length downto 0);
variable result : UNRESOLVED_sfixed (left_index+1 downto right_index);
begin
if (arg'length < 1 or result'length < 1) then
return NASF;
end if;
ressns (arg'length-1 downto 0) := to_s (cleanvec (arg));
ressns (arg'length) := ressns (arg'length-1); -- expand sign bit
result := to_fixed (abs(ressns), left_index+1, right_index);
return result;
end function "abs";
-- also grows the vector by 1 bit.
function "-" (
arg : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed
is
constant left_index : INTEGER := arg'high+1;
constant right_index : INTEGER := mine(arg'low, arg'low);
variable ressns : UNRESOLVED_SIGNED (arg'length downto 0);
variable result : UNRESOLVED_sfixed (left_index downto right_index);
begin
if (arg'length < 1 or result'length < 1) then
return NASF;
end if;
ressns (arg'length-1 downto 0) := to_s (cleanvec(arg));
ressns (arg'length) := ressns (arg'length-1); -- expand sign bit
result := to_fixed (-ressns, left_index, right_index);
return result;
end function "-";
-- Addition
function "+" (
l, r : UNRESOLVED_ufixed) -- ufixed(a downto b) + ufixed(c downto d) =
return UNRESOLVED_ufixed -- ufixed(max(a,c)+1 downto min(b,d))
is
constant left_index : INTEGER := maximum(l'high, r'high)+1;
constant right_index : INTEGER := mine(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
variable result : UNRESOLVED_ufixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_UNSIGNED (left_index-right_index
downto 0);
variable result_slv : UNRESOLVED_UNSIGNED (left_index-right_index
downto 0);
begin
if (l'length < 1 or r'length < 1 or result'length < 1) then
return NAUF;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_uns (lresize);
rslv := to_uns (rresize);
result_slv := lslv + rslv;
result := to_fixed(result_slv, left_index, right_index);
return result;
end function "+";
function "+" (
l, r : UNRESOLVED_sfixed) -- sfixed(a downto b) + sfixed(c downto d) =
return UNRESOLVED_sfixed -- sfixed(max(a,c)+1 downto min(b,d))
is
constant left_index : INTEGER := maximum(l'high, r'high)+1;
constant right_index : INTEGER := mine(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
variable result : UNRESOLVED_sfixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_SIGNED (left_index-right_index downto 0);
variable result_slv : UNRESOLVED_SIGNED (left_index-right_index downto 0);
begin
if (l'length < 1 or r'length < 1 or result'length < 1) then
return NASF;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_s (lresize);
rslv := to_s (rresize);
result_slv := lslv + rslv;
result := to_fixed(result_slv, left_index, right_index);
return result;
end function "+";
-- Subtraction
function "-" (
l, r : UNRESOLVED_ufixed) -- ufixed(a downto b) - ufixed(c downto d) =
return UNRESOLVED_ufixed -- ufixed(max(a,c)+1 downto min(b,d))
is
constant left_index : INTEGER := maximum(l'high, r'high)+1;
constant right_index : INTEGER := mine(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
variable result : UNRESOLVED_ufixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_UNSIGNED (left_index-right_index
downto 0);
variable result_slv : UNRESOLVED_UNSIGNED (left_index-right_index
downto 0);
begin
if (l'length < 1 or r'length < 1 or result'length < 1) then
return NAUF;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_uns (lresize);
rslv := to_uns (rresize);
result_slv := lslv - rslv;
result := to_fixed(result_slv, left_index, right_index);
return result;
end function "-";
function "-" (
l, r : UNRESOLVED_sfixed) -- sfixed(a downto b) - sfixed(c downto d) =
return UNRESOLVED_sfixed -- sfixed(max(a,c)+1 downto min(b,d))
is
constant left_index : INTEGER := maximum(l'high, r'high)+1;
constant right_index : INTEGER := mine(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
variable result : UNRESOLVED_sfixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_SIGNED (left_index-right_index downto 0);
variable result_slv : UNRESOLVED_SIGNED (left_index-right_index downto 0);
begin
if (l'length < 1 or r'length < 1 or result'length < 1) then
return NASF;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_s (lresize);
rslv := to_s (rresize);
result_slv := lslv - rslv;
result := to_fixed(result_slv, left_index, right_index);
return result;
end function "-";
function "*" (
l, r : UNRESOLVED_ufixed) -- ufixed(a downto b) * ufixed(c downto d) =
return UNRESOLVED_ufixed -- ufixed(a+c+1 downto b+d)
is
variable lslv : UNRESOLVED_UNSIGNED (l'length-1 downto 0);
variable rslv : UNRESOLVED_UNSIGNED (r'length-1 downto 0);
variable result_slv : UNRESOLVED_UNSIGNED (r'length+l'length-1 downto 0);
variable result : UNRESOLVED_ufixed (l'high + r'high+1 downto
mine(l'low, l'low) + mine(r'low, r'low));
begin
if (l'length < 1 or r'length < 1 or
result'length /= result_slv'length) then
return NAUF;
end if;
lslv := to_uns (cleanvec(l));
rslv := to_uns (cleanvec(r));
result_slv := lslv * rslv;
result := to_fixed (result_slv, result'high, result'low);
return result;
end function "*";
function "*" (
l, r : UNRESOLVED_sfixed) -- sfixed(a downto b) * sfixed(c downto d) =
return UNRESOLVED_sfixed -- sfixed(a+c+1 downto b+d)
is
variable lslv : UNRESOLVED_SIGNED (l'length-1 downto 0);
variable rslv : UNRESOLVED_SIGNED (r'length-1 downto 0);
variable result_slv : UNRESOLVED_SIGNED (r'length+l'length-1 downto 0);
variable result : UNRESOLVED_sfixed (l'high + r'high+1 downto
mine(l'low, l'low) + mine(r'low, r'low));
begin
if (l'length < 1 or r'length < 1 or
result'length /= result_slv'length) then
return NASF;
end if;
lslv := to_s (cleanvec(l));
rslv := to_s (cleanvec(r));
result_slv := lslv * rslv;
result := to_fixed (result_slv, result'high, result'low);
return result;
end function "*";
function "/" (
l, r : UNRESOLVED_ufixed) -- ufixed(a downto b) / ufixed(c downto d) =
return UNRESOLVED_ufixed is -- ufixed(a-d downto b-c-1)
begin
return divide (l, r);
end function "/";
function "/" (
l, r : UNRESOLVED_sfixed) -- sfixed(a downto b) / sfixed(c downto d) =
return UNRESOLVED_sfixed is -- sfixed(a-d+1 downto b-c)
begin
return divide (l, r);
end function "/";
-- This version of divide gives the user more control
-- ufixed(a downto b) / ufixed(c downto d) = ufixed(a-d downto b-c-1)
function divide (
l, r : UNRESOLVED_ufixed;
constant round_style : fixed_round_style_type := fixed_round_style;
constant guard_bits : NATURAL := fixed_guard_bits)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (l'high - mine(r'low, r'low) downto
mine (l'low, l'low) - r'high -1);
variable dresult : UNRESOLVED_ufixed (result'high downto result'low -guard_bits);
variable lresize : UNRESOLVED_ufixed (l'high downto l'high - dresult'length+1);
variable lslv : UNRESOLVED_UNSIGNED (lresize'length-1 downto 0);
variable rslv : UNRESOLVED_UNSIGNED (r'length-1 downto 0);
variable result_slv : UNRESOLVED_UNSIGNED (lresize'length-1 downto 0);
begin
if (l'length < 1 or r'length < 1 or
mins(r'low, r'low) /= r'low or mins(l'low, l'low) /= l'low) then
return NAUF;
end if;
lresize := resize (arg => l,
left_index => lresize'high,
right_index => lresize'low,
overflow_style => fixed_wrap, -- vector only grows
round_style => fixed_truncate);
lslv := to_uns (cleanvec (lresize));
rslv := to_uns (cleanvec (r));
if (rslv = 0) then
report fixed_generic_pkg'instance_name
& "DIVIDE(ufixed) Division by zero" severity error;
result := saturate (result'high, result'low); -- saturate
else
result_slv := lslv / rslv;
dresult := to_fixed (result_slv, dresult'high, dresult'low);
result := resize (arg => dresult,
left_index => result'high,
right_index => result'low,
overflow_style => fixed_wrap, -- overflow impossible
round_style => round_style);
end if;
return result;
end function divide;
-- sfixed(a downto b) / sfixed(c downto d) = sfixed(a-d+1 downto b-c)
function divide (
l, r : UNRESOLVED_sfixed;
constant round_style : fixed_round_style_type := fixed_round_style;
constant guard_bits : NATURAL := fixed_guard_bits)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (l'high - mine(r'low, r'low) + 1 downto
mine (l'low, l'low) - r'high);
variable dresult : UNRESOLVED_sfixed (result'high downto result'low-guard_bits);
variable lresize : UNRESOLVED_sfixed (l'high+1 downto l'high+1 -dresult'length+1);
variable lslv : UNRESOLVED_SIGNED (lresize'length-1 downto 0);
variable rslv : UNRESOLVED_SIGNED (r'length-1 downto 0);
variable result_slv : UNRESOLVED_SIGNED (lresize'length-1 downto 0);
begin
if (l'length < 1 or r'length < 1 or
mins(r'low, r'low) /= r'low or mins(l'low, l'low) /= l'low) then
return NASF;
end if;
lresize := resize (arg => l,
left_index => lresize'high,
right_index => lresize'low,
overflow_style => fixed_wrap, -- vector only grows
round_style => fixed_truncate);
lslv := to_s (cleanvec (lresize));
rslv := to_s (cleanvec (r));
if (rslv = 0) then
report fixed_generic_pkg'instance_name
& "DIVIDE(sfixed) Division by zero" severity error;
result := saturate (result'high, result'low);
else
result_slv := lslv / rslv;
dresult := to_fixed (result_slv, dresult'high, dresult'low);
result := resize (arg => dresult,
left_index => result'high,
right_index => result'low,
overflow_style => fixed_wrap, -- overflow impossible
round_style => round_style);
end if;
return result;
end function divide;
-- 1 / ufixed(a downto b) = ufixed(-b downto -a-1)
function reciprocal (
arg : UNRESOLVED_ufixed; -- fixed point input
constant round_style : fixed_round_style_type := fixed_round_style;
constant guard_bits : NATURAL := fixed_guard_bits)
return UNRESOLVED_ufixed
is
constant one : UNRESOLVED_ufixed (0 downto 0) := "1";
begin
return divide (l => one,
r => arg,
round_style => round_style,
guard_bits => guard_bits);
end function reciprocal;
-- 1 / sfixed(a downto b) = sfixed(-b+1 downto -a)
function reciprocal (
arg : UNRESOLVED_sfixed; -- fixed point input
constant round_style : fixed_round_style_type := fixed_round_style;
constant guard_bits : NATURAL := fixed_guard_bits)
return UNRESOLVED_sfixed
is
constant one : UNRESOLVED_sfixed (1 downto 0) := "01"; -- extra bit.
variable resultx : UNRESOLVED_sfixed (-mine(arg'low, arg'low)+2 downto -arg'high);
begin
if (arg'length < 1 or resultx'length < 1) then
return NASF;
else
resultx := divide (l => one,
r => arg,
round_style => round_style,
guard_bits => guard_bits);
return resultx (resultx'high-1 downto resultx'low); -- remove extra bit
end if;
end function reciprocal;
-- ufixed (a downto b) rem ufixed (c downto d)
-- = ufixed (min(a,c) downto min(b,d))
function "rem" (
l, r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return remainder (l, r);
end function "rem";
-- remainder
-- sfixed (a downto b) rem sfixed (c downto d)
-- = sfixed (min(a,c) downto min(b,d))
function "rem" (
l, r : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed is
begin
return remainder (l, r);
end function "rem";
-- ufixed (a downto b) rem ufixed (c downto d)
-- = ufixed (min(a,c) downto min(b,d))
function remainder (
l, r : UNRESOLVED_ufixed; -- fixed point input
constant round_style : fixed_round_style_type := fixed_round_style;
constant guard_bits : NATURAL := fixed_guard_bits)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (minimum(l'high, r'high) downto
mine(l'low, r'low));
constant rlow : integer := mins(r'low, r'low);
variable lresize : UNRESOLVED_ufixed (maximum(l'high, r'low) downto
rlow-guard_bits);
variable rresize : UNRESOLVED_ufixed (r'high downto rlow-guard_bits);
variable dresult : UNRESOLVED_ufixed (rresize'range);
variable lslv : UNRESOLVED_UNSIGNED (lresize'length-1 downto 0);
variable rslv : UNRESOLVED_UNSIGNED (rresize'length-1 downto 0);
variable result_slv : UNRESOLVED_UNSIGNED (rslv'range);
begin
if (l'length < 1 or r'length < 1 or
mins(r'low, r'low) /= r'low or mins(l'low, l'low) /= l'low) then
return NAUF;
end if;
lresize := resize (arg => l,
left_index => lresize'high,
right_index => lresize'low,
overflow_style => fixed_wrap, -- vector only grows
round_style => fixed_truncate);
lslv := to_uns (lresize);
rresize := resize (arg => r,
left_index => rresize'high,
right_index => rresize'low,
overflow_style => fixed_wrap, -- vector only grows
round_style => fixed_truncate);
rslv := to_uns (rresize);
if (rslv = 0) then
report fixed_generic_pkg'instance_name
& "remainder(ufixed) Division by zero" severity error;
result := saturate (result'high, result'low); -- saturate
else
if (r'low <= l'high) then
result_slv := lslv rem rslv;
dresult := to_fixed (result_slv, dresult'high, dresult'low);
result := resize (arg => dresult,
left_index => result'high,
right_index => result'low,
overflow_style => fixed_wrap, -- can't overflow
round_style => round_style);
end if;
if l'low < r'low then
result(mins(r'low-1, l'high) downto l'low) :=
cleanvec(l(mins(r'low-1, l'high) downto l'low));
end if;
end if;
return result;
end function remainder;
-- remainder
-- sfixed (a downto b) rem sfixed (c downto d)
-- = sfixed (min(a,c) downto min(b,d))
function remainder (
l, r : UNRESOLVED_sfixed; -- fixed point input
constant round_style : fixed_round_style_type := fixed_round_style;
constant guard_bits : NATURAL := fixed_guard_bits)
return UNRESOLVED_sfixed
is
variable l_abs : UNRESOLVED_ufixed (l'range);
variable r_abs : UNRESOLVED_ufixed (r'range);
variable result : UNRESOLVED_sfixed (minimum(r'high, l'high) downto
mine(r'low, l'low));
variable neg_result : UNRESOLVED_sfixed (minimum(r'high, l'high)+1 downto
mins(r'low, l'low));
begin
if (l'length < 1 or r'length < 1 or
mins(r'low, r'low) /= r'low or mins(l'low, l'low) /= l'low) then
return NASF;
end if;
l_abs := to_ufixed (l);
r_abs := to_ufixed (r);
result := UNRESOLVED_sfixed (remainder (
l => l_abs,
r => r_abs,
round_style => round_style));
neg_result := -result;
if l(l'high) = '1' then
result := neg_result(result'range);
end if;
return result;
end function remainder;
-- modulo
-- ufixed (a downto b) mod ufixed (c downto d)
-- = ufixed (min(a,c) downto min(b, d))
function "mod" (
l, r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return modulo (l, r);
end function "mod";
-- sfixed (a downto b) mod sfixed (c downto d)
-- = sfixed (c downto min(b, d))
function "mod" (
l, r : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed is
begin
return modulo(l, r);
end function "mod";
-- modulo
-- ufixed (a downto b) mod ufixed (c downto d)
-- = ufixed (min(a,c) downto min(b, d))
function modulo (
l, r : UNRESOLVED_ufixed; -- fixed point input
constant round_style : fixed_round_style_type := fixed_round_style;
constant guard_bits : NATURAL := fixed_guard_bits)
return UNRESOLVED_ufixed is
begin
return remainder(l => l,
r => r,
round_style => round_style,
guard_bits => guard_bits);
end function modulo;
-- sfixed (a downto b) mod sfixed (c downto d)
-- = sfixed (c downto min(b, d))
function modulo (
l, r : UNRESOLVED_sfixed; -- fixed point input
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style;
constant guard_bits : NATURAL := fixed_guard_bits)
return UNRESOLVED_sfixed
is
variable l_abs : UNRESOLVED_ufixed (l'range);
variable r_abs : UNRESOLVED_ufixed (r'range);
variable result : UNRESOLVED_sfixed (r'high downto
mine(r'low, l'low));
variable dresult : UNRESOLVED_sfixed (minimum(r'high, l'high)+1 downto
mins(r'low, l'low));
variable dresult_not_zero : BOOLEAN;
begin
if (l'length < 1 or r'length < 1 or
mins(r'low, r'low) /= r'low or mins(l'low, l'low) /= l'low) then
return NASF;
end if;
l_abs := to_ufixed (l);
r_abs := to_ufixed (r);
dresult := "0" & UNRESOLVED_sfixed(remainder (l => l_abs,
r => r_abs,
round_style => round_style));
if (to_s(dresult) = 0) then
dresult_not_zero := false;
else
dresult_not_zero := true;
end if;
if to_x01(l(l'high)) = '1' and to_x01(r(r'high)) = '0'
and dresult_not_zero then
result := resize (arg => r - dresult,
left_index => result'high,
right_index => result'low,
overflow_style => overflow_style,
round_style => round_style);
elsif to_x01(l(l'high)) = '1' and to_x01(r(r'high)) = '1' then
result := resize (arg => -dresult,
left_index => result'high,
right_index => result'low,
overflow_style => overflow_style,
round_style => round_style);
elsif to_x01(l(l'high)) = '0' and to_x01(r(r'high)) = '1'
and dresult_not_zero then
result := resize (arg => dresult + r,
left_index => result'high,
right_index => result'low,
overflow_style => overflow_style,
round_style => round_style);
else
result := resize (arg => dresult,
left_index => result'high,
right_index => result'low,
overflow_style => overflow_style,
round_style => round_style);
end if;
return result;
end function modulo;
-- Procedure for those who need an "accumulator" function
procedure add_carry (
L, R : in UNRESOLVED_ufixed;
c_in : in STD_ULOGIC;
result : out UNRESOLVED_ufixed;
c_out : out STD_ULOGIC) is
constant left_index : INTEGER := maximum(l'high, r'high)+1;
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_UNSIGNED (left_index-right_index
downto 0);
variable result_slv : UNRESOLVED_UNSIGNED (left_index-right_index
downto 0);
variable cx : UNRESOLVED_UNSIGNED (0 downto 0); -- Carry in
begin
if (l'length < 1 or r'length < 1) then
result := NAUF;
c_out := '0';
else
cx (0) := c_in;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_uns (lresize);
rslv := to_uns (rresize);
result_slv := lslv + rslv + cx;
c_out := result_slv(left_index);
result := to_fixed(result_slv (left_index-right_index-1 downto 0),
left_index-1, right_index);
end if;
end procedure add_carry;
procedure add_carry (
L, R : in UNRESOLVED_sfixed;
c_in : in STD_ULOGIC;
result : out UNRESOLVED_sfixed;
c_out : out STD_ULOGIC) is
constant left_index : INTEGER := maximum(l'high, r'high)+1;
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_SIGNED (left_index-right_index
downto 0);
variable result_slv : UNRESOLVED_SIGNED (left_index-right_index
downto 0);
variable cx : UNRESOLVED_SIGNED (1 downto 0); -- Carry in
begin
if (l'length < 1 or r'length < 1) then
result := NASF;
c_out := '0';
else
cx (1) := '0';
cx (0) := c_in;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_s (lresize);
rslv := to_s (rresize);
result_slv := lslv + rslv + cx;
c_out := result_slv(left_index);
result := to_fixed(result_slv (left_index-right_index-1 downto 0),
left_index-1, right_index);
end if;
end procedure add_carry;
-- Scales the result by a power of 2. Width of input = width of output with
-- the decimal point moved.
function scalb (y : UNRESOLVED_ufixed; N : INTEGER)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (y'high+N downto y'low+N);
begin
if y'length < 1 then
return NAUF;
else
result := y;
return result;
end if;
end function scalb;
function scalb (y : UNRESOLVED_ufixed; N : UNRESOLVED_SIGNED)
return UNRESOLVED_ufixed is
begin
return scalb (y => y,
N => to_integer(N));
end function scalb;
function scalb (y : UNRESOLVED_sfixed; N : INTEGER)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (y'high+N downto y'low+N);
begin
if y'length < 1 then
return NASF;
else
result := y;
return result;
end if;
end function scalb;
function scalb (y : UNRESOLVED_sfixed; N : UNRESOLVED_SIGNED)
return UNRESOLVED_sfixed is
begin
return scalb (y => y,
N => to_integer(N));
end function scalb;
function Is_Negative (arg : UNRESOLVED_sfixed) return BOOLEAN is
begin
if to_X01(arg(arg'high)) = '1' then
return true;
else
return false;
end if;
end function Is_Negative;
function find_rightmost (arg : UNRESOLVED_ufixed; y : STD_ULOGIC)
return INTEGER is
begin
for_loop : for i in arg'reverse_range loop
if arg(i) ?= y then
return i;
end if;
end loop;
return arg'high+1; -- return out of bounds 'high
end function find_rightmost;
function find_leftmost (arg : UNRESOLVED_ufixed; y : STD_ULOGIC)
return INTEGER is
begin
for_loop : for i in arg'range loop
if arg(i) ?= y then
return i;
end if;
end loop;
return arg'low-1; -- return out of bounds 'low
end function find_leftmost;
function find_rightmost (arg : UNRESOLVED_sfixed; y : STD_ULOGIC)
return INTEGER is
begin
for_loop : for i in arg'reverse_range loop
if arg(i) ?= y then
return i;
end if;
end loop;
return arg'high+1; -- return out of bounds 'high
end function find_rightmost;
function find_leftmost (arg : UNRESOLVED_sfixed; y : STD_ULOGIC)
return INTEGER is
begin
for_loop : for i in arg'range loop
if arg(i) ?= y then
return i;
end if;
end loop;
return arg'low-1; -- return out of bounds 'low
end function find_leftmost;
function "sll" (ARG : UNRESOLVED_ufixed; COUNT : INTEGER)
return UNRESOLVED_ufixed
is
variable argslv : UNRESOLVED_UNSIGNED (arg'length-1 downto 0);
variable result : UNRESOLVED_ufixed (arg'range);
begin
argslv := to_uns (arg);
argslv := argslv sll COUNT;
result := to_fixed (argslv, result'high, result'low);
return result;
end function "sll";
function "srl" (ARG : UNRESOLVED_ufixed; COUNT : INTEGER)
return UNRESOLVED_ufixed
is
variable argslv : UNRESOLVED_UNSIGNED (arg'length-1 downto 0);
variable result : UNRESOLVED_ufixed (arg'range);
begin
argslv := to_uns (arg);
argslv := argslv srl COUNT;
result := to_fixed (argslv, result'high, result'low);
return result;
end function "srl";
function "rol" (ARG : UNRESOLVED_ufixed; COUNT : INTEGER)
return UNRESOLVED_ufixed
is
variable argslv : UNRESOLVED_UNSIGNED (arg'length-1 downto 0);
variable result : UNRESOLVED_ufixed (arg'range);
begin
argslv := to_uns (arg);
argslv := argslv rol COUNT;
result := to_fixed (argslv, result'high, result'low);
return result;
end function "rol";
function "ror" (ARG : UNRESOLVED_ufixed; COUNT : INTEGER)
return UNRESOLVED_ufixed
is
variable argslv : UNRESOLVED_UNSIGNED (arg'length-1 downto 0);
variable result : UNRESOLVED_ufixed (arg'range);
begin
argslv := to_uns (arg);
argslv := argslv ror COUNT;
result := to_fixed (argslv, result'high, result'low);
return result;
end function "ror";
function "sla" (ARG : UNRESOLVED_ufixed; COUNT : INTEGER)
return UNRESOLVED_ufixed
is
variable argslv : UNRESOLVED_UNSIGNED (arg'length-1 downto 0);
variable result : UNRESOLVED_ufixed (arg'range);
begin
argslv := to_uns (arg);
-- Arithmetic shift on an unsigned is a logical shift
argslv := argslv sll COUNT;
result := to_fixed (argslv, result'high, result'low);
return result;
end function "sla";
function "sra" (ARG : UNRESOLVED_ufixed; COUNT : INTEGER)
return UNRESOLVED_ufixed
is
variable argslv : UNRESOLVED_UNSIGNED (arg'length-1 downto 0);
variable result : UNRESOLVED_ufixed (arg'range);
begin
argslv := to_uns (arg);
-- Arithmetic shift on an unsigned is a logical shift
argslv := argslv srl COUNT;
result := to_fixed (argslv, result'high, result'low);
return result;
end function "sra";
function "sll" (ARG : UNRESOLVED_sfixed; COUNT : INTEGER)
return UNRESOLVED_sfixed
is
variable argslv : UNRESOLVED_SIGNED (arg'length-1 downto 0);
variable result : UNRESOLVED_sfixed (arg'range);
begin
argslv := to_s (arg);
argslv := argslv sll COUNT;
result := to_fixed (argslv, result'high, result'low);
return result;
end function "sll";
function "srl" (ARG : UNRESOLVED_sfixed; COUNT : INTEGER)
return UNRESOLVED_sfixed
is
variable argslv : UNRESOLVED_SIGNED (arg'length-1 downto 0);
variable result : UNRESOLVED_sfixed (arg'range);
begin
argslv := to_s (arg);
argslv := argslv srl COUNT;
result := to_fixed (argslv, result'high, result'low);
return result;
end function "srl";
function "rol" (ARG : UNRESOLVED_sfixed; COUNT : INTEGER)
return UNRESOLVED_sfixed
is
variable argslv : UNRESOLVED_SIGNED (arg'length-1 downto 0);
variable result : UNRESOLVED_sfixed (arg'range);
begin
argslv := to_s (arg);
argslv := argslv rol COUNT;
result := to_fixed (argslv, result'high, result'low);
return result;
end function "rol";
function "ror" (ARG : UNRESOLVED_sfixed; COUNT : INTEGER)
return UNRESOLVED_sfixed
is
variable argslv : UNRESOLVED_SIGNED (arg'length-1 downto 0);
variable result : UNRESOLVED_sfixed (arg'range);
begin
argslv := to_s (arg);
argslv := argslv ror COUNT;
result := to_fixed (argslv, result'high, result'low);
return result;
end function "ror";
function "sla" (ARG : UNRESOLVED_sfixed; COUNT : INTEGER)
return UNRESOLVED_sfixed
is
variable argslv : UNRESOLVED_SIGNED (arg'length-1 downto 0);
variable result : UNRESOLVED_sfixed (arg'range);
begin
argslv := to_s (arg);
if COUNT > 0 then
-- Arithmetic shift left on a 2's complement number is a logic shift
argslv := argslv sll COUNT;
else
argslv := argslv sra -COUNT;
end if;
result := to_fixed (argslv, result'high, result'low);
return result;
end function "sla";
function "sra" (ARG : UNRESOLVED_sfixed; COUNT : INTEGER)
return UNRESOLVED_sfixed
is
variable argslv : UNRESOLVED_SIGNED (arg'length-1 downto 0);
variable result : UNRESOLVED_sfixed (arg'range);
begin
argslv := to_s (arg);
if COUNT > 0 then
argslv := argslv sra COUNT;
else
-- Arithmetic shift left on a 2's complement number is a logic shift
argslv := argslv sll -COUNT;
end if;
result := to_fixed (argslv, result'high, result'low);
return result;
end function "sra";
-- Because some people want the older functions.
function SHIFT_LEFT (ARG : UNRESOLVED_ufixed; COUNT : NATURAL)
return UNRESOLVED_ufixed is
begin
if (ARG'length < 1) then
return NAUF;
end if;
return ARG sla COUNT;
end function SHIFT_LEFT;
function SHIFT_RIGHT (ARG : UNRESOLVED_ufixed; COUNT : NATURAL)
return UNRESOLVED_ufixed is
begin
if (ARG'length < 1) then
return NAUF;
end if;
return ARG sra COUNT;
end function SHIFT_RIGHT;
function SHIFT_LEFT (ARG : UNRESOLVED_sfixed; COUNT : NATURAL)
return UNRESOLVED_sfixed is
begin
if (ARG'length < 1) then
return NASF;
end if;
return ARG sla COUNT;
end function SHIFT_LEFT;
function SHIFT_RIGHT (ARG : UNRESOLVED_sfixed; COUNT : NATURAL)
return UNRESOLVED_sfixed is
begin
if (ARG'length < 1) then
return NASF;
end if;
return ARG sra COUNT;
end function SHIFT_RIGHT;
----------------------------------------------------------------------------
-- logical functions
----------------------------------------------------------------------------
function "not" (L : UNRESOLVED_ufixed) return UNRESOLVED_ufixed is
variable RESULT : STD_ULOGIC_VECTOR(L'length-1 downto 0); -- force downto
begin
RESULT := not to_sulv(L);
return to_ufixed(RESULT, L'high, L'low);
end function "not";
function "and" (L, R : UNRESOLVED_ufixed) return UNRESOLVED_ufixed is
variable RESULT : STD_ULOGIC_VECTOR(L'length-1 downto 0); -- force downto
begin
if (L'high = R'high and L'low = R'low) then
RESULT := to_sulv(L) and to_sulv(R);
else
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """and"": Range error L'RANGE /= R'RANGE"
severity warning;
RESULT := (others => 'X');
end if;
return to_ufixed(RESULT, L'high, L'low);
end function "and";
function "or" (L, R : UNRESOLVED_ufixed) return UNRESOLVED_ufixed is
variable RESULT : STD_ULOGIC_VECTOR(L'length-1 downto 0); -- force downto
begin
if (L'high = R'high and L'low = R'low) then
RESULT := to_sulv(L) or to_sulv(R);
else
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """or"": Range error L'RANGE /= R'RANGE"
severity warning;
RESULT := (others => 'X');
end if;
return to_ufixed(RESULT, L'high, L'low);
end function "or";
function "nand" (L, R : UNRESOLVED_ufixed) return UNRESOLVED_ufixed is
variable RESULT : STD_ULOGIC_VECTOR(L'length-1 downto 0); -- force downto
begin
if (L'high = R'high and L'low = R'low) then
RESULT := to_sulv(L) nand to_sulv(R);
else
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """nand"": Range error L'RANGE /= R'RANGE"
severity warning;
RESULT := (others => 'X');
end if;
return to_ufixed(RESULT, L'high, L'low);
end function "nand";
function "nor" (L, R : UNRESOLVED_ufixed) return UNRESOLVED_ufixed is
variable RESULT : STD_ULOGIC_VECTOR(L'length-1 downto 0); -- force downto
begin
if (L'high = R'high and L'low = R'low) then
RESULT := to_sulv(L) nor to_sulv(R);
else
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """nor"": Range error L'RANGE /= R'RANGE"
severity warning;
RESULT := (others => 'X');
end if;
return to_ufixed(RESULT, L'high, L'low);
end function "nor";
function "xor" (L, R : UNRESOLVED_ufixed) return UNRESOLVED_ufixed is
variable RESULT : STD_ULOGIC_VECTOR(L'length-1 downto 0); -- force downto
begin
if (L'high = R'high and L'low = R'low) then
RESULT := to_sulv(L) xor to_sulv(R);
else
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """xor"": Range error L'RANGE /= R'RANGE"
severity warning;
RESULT := (others => 'X');
end if;
return to_ufixed(RESULT, L'high, L'low);
end function "xor";
function "xnor" (L, R : UNRESOLVED_ufixed) return UNRESOLVED_ufixed is
variable RESULT : STD_ULOGIC_VECTOR(L'length-1 downto 0); -- force downto
begin
if (L'high = R'high and L'low = R'low) then
RESULT := to_sulv(L) xnor to_sulv(R);
else
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """xnor"": Range error L'RANGE /= R'RANGE"
severity warning;
RESULT := (others => 'X');
end if;
return to_ufixed(RESULT, L'high, L'low);
end function "xnor";
function "not" (L : UNRESOLVED_sfixed) return UNRESOLVED_sfixed is
variable RESULT : STD_ULOGIC_VECTOR(L'length-1 downto 0); -- force downto
begin
RESULT := not to_sulv(L);
return to_sfixed(RESULT, L'high, L'low);
end function "not";
function "and" (L, R : UNRESOLVED_sfixed) return UNRESOLVED_sfixed is
variable RESULT : STD_ULOGIC_VECTOR(L'length-1 downto 0); -- force downto
begin
if (L'high = R'high and L'low = R'low) then
RESULT := to_sulv(L) and to_sulv(R);
else
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """and"": Range error L'RANGE /= R'RANGE"
severity warning;
RESULT := (others => 'X');
end if;
return to_sfixed(RESULT, L'high, L'low);
end function "and";
function "or" (L, R : UNRESOLVED_sfixed) return UNRESOLVED_sfixed is
variable RESULT : STD_ULOGIC_VECTOR(L'length-1 downto 0); -- force downto
begin
if (L'high = R'high and L'low = R'low) then
RESULT := to_sulv(L) or to_sulv(R);
else
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """or"": Range error L'RANGE /= R'RANGE"
severity warning;
RESULT := (others => 'X');
end if;
return to_sfixed(RESULT, L'high, L'low);
end function "or";
function "nand" (L, R : UNRESOLVED_sfixed) return UNRESOLVED_sfixed is
variable RESULT : STD_ULOGIC_VECTOR(L'length-1 downto 0); -- force downto
begin
if (L'high = R'high and L'low = R'low) then
RESULT := to_sulv(L) nand to_sulv(R);
else
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """nand"": Range error L'RANGE /= R'RANGE"
severity warning;
RESULT := (others => 'X');
end if;
return to_sfixed(RESULT, L'high, L'low);
end function "nand";
function "nor" (L, R : UNRESOLVED_sfixed) return UNRESOLVED_sfixed is
variable RESULT : STD_ULOGIC_VECTOR(L'length-1 downto 0); -- force downto
begin
if (L'high = R'high and L'low = R'low) then
RESULT := to_sulv(L) nor to_sulv(R);
else
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """nor"": Range error L'RANGE /= R'RANGE"
severity warning;
RESULT := (others => 'X');
end if;
return to_sfixed(RESULT, L'high, L'low);
end function "nor";
function "xor" (L, R : UNRESOLVED_sfixed) return UNRESOLVED_sfixed is
variable RESULT : STD_ULOGIC_VECTOR(L'length-1 downto 0); -- force downto
begin
if (L'high = R'high and L'low = R'low) then
RESULT := to_sulv(L) xor to_sulv(R);
else
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """xor"": Range error L'RANGE /= R'RANGE"
severity warning;
RESULT := (others => 'X');
end if;
return to_sfixed(RESULT, L'high, L'low);
end function "xor";
function "xnor" (L, R : UNRESOLVED_sfixed) return UNRESOLVED_sfixed is
variable RESULT : STD_ULOGIC_VECTOR(L'length-1 downto 0); -- force downto
begin
if (L'high = R'high and L'low = R'low) then
RESULT := to_sulv(L) xnor to_sulv(R);
else
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """xnor"": Range error L'RANGE /= R'RANGE"
severity warning;
RESULT := (others => 'X');
end if;
return to_sfixed(RESULT, L'high, L'low);
end function "xnor";
-- Vector and std_ulogic functions, same as functions in numeric_std
function "and" (L : STD_ULOGIC; R : UNRESOLVED_ufixed)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (R'range);
begin
for i in result'range loop
result(i) := L and R(i);
end loop;
return result;
end function "and";
function "and" (L : UNRESOLVED_ufixed; R : STD_ULOGIC)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (L'range);
begin
for i in result'range loop
result(i) := L(i) and R;
end loop;
return result;
end function "and";
function "or" (L : STD_ULOGIC; R : UNRESOLVED_ufixed)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (R'range);
begin
for i in result'range loop
result(i) := L or R(i);
end loop;
return result;
end function "or";
function "or" (L : UNRESOLVED_ufixed; R : STD_ULOGIC)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (L'range);
begin
for i in result'range loop
result(i) := L(i) or R;
end loop;
return result;
end function "or";
function "nand" (L : STD_ULOGIC; R : UNRESOLVED_ufixed)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (R'range);
begin
for i in result'range loop
result(i) := L nand R(i);
end loop;
return result;
end function "nand";
function "nand" (L : UNRESOLVED_ufixed; R : STD_ULOGIC)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (L'range);
begin
for i in result'range loop
result(i) := L(i) nand R;
end loop;
return result;
end function "nand";
function "nor" (L : STD_ULOGIC; R : UNRESOLVED_ufixed)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (R'range);
begin
for i in result'range loop
result(i) := L nor R(i);
end loop;
return result;
end function "nor";
function "nor" (L : UNRESOLVED_ufixed; R : STD_ULOGIC)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (L'range);
begin
for i in result'range loop
result(i) := L(i) nor R;
end loop;
return result;
end function "nor";
function "xor" (L : STD_ULOGIC; R : UNRESOLVED_ufixed)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (R'range);
begin
for i in result'range loop
result(i) := L xor R(i);
end loop;
return result;
end function "xor";
function "xor" (L : UNRESOLVED_ufixed; R : STD_ULOGIC)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (L'range);
begin
for i in result'range loop
result(i) := L(i) xor R;
end loop;
return result;
end function "xor";
function "xnor" (L : STD_ULOGIC; R : UNRESOLVED_ufixed)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (R'range);
begin
for i in result'range loop
result(i) := L xnor R(i);
end loop;
return result;
end function "xnor";
function "xnor" (L : UNRESOLVED_ufixed; R : STD_ULOGIC)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (L'range);
begin
for i in result'range loop
result(i) := L(i) xnor R;
end loop;
return result;
end function "xnor";
function "and" (L : STD_ULOGIC; R : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (R'range);
begin
for i in result'range loop
result(i) := L and R(i);
end loop;
return result;
end function "and";
function "and" (L : UNRESOLVED_sfixed; R : STD_ULOGIC)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (L'range);
begin
for i in result'range loop
result(i) := L(i) and R;
end loop;
return result;
end function "and";
function "or" (L : STD_ULOGIC; R : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (R'range);
begin
for i in result'range loop
result(i) := L or R(i);
end loop;
return result;
end function "or";
function "or" (L : UNRESOLVED_sfixed; R : STD_ULOGIC)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (L'range);
begin
for i in result'range loop
result(i) := L(i) or R;
end loop;
return result;
end function "or";
function "nand" (L : STD_ULOGIC; R : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (R'range);
begin
for i in result'range loop
result(i) := L nand R(i);
end loop;
return result;
end function "nand";
function "nand" (L : UNRESOLVED_sfixed; R : STD_ULOGIC)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (L'range);
begin
for i in result'range loop
result(i) := L(i) nand R;
end loop;
return result;
end function "nand";
function "nor" (L : STD_ULOGIC; R : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (R'range);
begin
for i in result'range loop
result(i) := L nor R(i);
end loop;
return result;
end function "nor";
function "nor" (L : UNRESOLVED_sfixed; R : STD_ULOGIC)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (L'range);
begin
for i in result'range loop
result(i) := L(i) nor R;
end loop;
return result;
end function "nor";
function "xor" (L : STD_ULOGIC; R : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (R'range);
begin
for i in result'range loop
result(i) := L xor R(i);
end loop;
return result;
end function "xor";
function "xor" (L : UNRESOLVED_sfixed; R : STD_ULOGIC)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (L'range);
begin
for i in result'range loop
result(i) := L(i) xor R;
end loop;
return result;
end function "xor";
function "xnor" (L : STD_ULOGIC; R : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (R'range);
begin
for i in result'range loop
result(i) := L xnor R(i);
end loop;
return result;
end function "xnor";
function "xnor" (L : UNRESOLVED_sfixed; R : STD_ULOGIC)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (L'range);
begin
for i in result'range loop
result(i) := L(i) xnor R;
end loop;
return result;
end function "xnor";
-- Reduction operators
function "and" (l : UNRESOLVED_ufixed) return STD_ULOGIC is
begin
return and to_sulv(l);
end function "and";
function "nand" (l : UNRESOLVED_ufixed) return STD_ULOGIC is
begin
return nand to_sulv(l);
end function "nand";
function "or" (l : UNRESOLVED_ufixed) return STD_ULOGIC is
begin
return or to_sulv(l);
end function "or";
function "nor" (l : UNRESOLVED_ufixed) return STD_ULOGIC is
begin
return nor to_sulv(l);
end function "nor";
function "xor" (l : UNRESOLVED_ufixed) return STD_ULOGIC is
begin
return xor to_sulv(l);
end function "xor";
function "xnor" (l : UNRESOLVED_ufixed) return STD_ULOGIC is
begin
return xnor to_sulv(l);
end function "xnor";
function "and" (l : UNRESOLVED_sfixed) return STD_ULOGIC is
begin
return and to_sulv(l);
end function "and";
function "nand" (l : UNRESOLVED_sfixed) return STD_ULOGIC is
begin
return nand to_sulv(l);
end function "nand";
function "or" (l : UNRESOLVED_sfixed) return STD_ULOGIC is
begin
return or to_sulv(l);
end function "or";
function "nor" (l : UNRESOLVED_sfixed) return STD_ULOGIC is
begin
return nor to_sulv(l);
end function "nor";
function "xor" (l : UNRESOLVED_sfixed) return STD_ULOGIC is
begin
return xor to_sulv(l);
end function "xor";
function "xnor" (l : UNRESOLVED_sfixed) return STD_ULOGIC is
begin
return xnor to_sulv(l);
end function "xnor";
-- End reduction operators
function "?=" (L, R : UNRESOLVED_ufixed) return STD_ULOGIC is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_UNSIGNED (lresize'length-1 downto 0);
begin -- ?=
if ((L'length < 1) or (R'length < 1)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """?="": null detected, returning X"
severity warning;
return 'X';
else
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_uns (lresize);
rslv := to_uns (rresize);
return lslv ?= rslv;
end if;
end function "?=";
function "?/=" (L, R : UNRESOLVED_ufixed) return STD_ULOGIC is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_UNSIGNED (lresize'length-1 downto 0);
begin -- ?/=
if ((L'length < 1) or (R'length < 1)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """?/="": null detected, returning X"
severity warning;
return 'X';
else
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_uns (lresize);
rslv := to_uns (rresize);
return lslv ?/= rslv;
end if;
end function "?/=";
function "?>" (L, R : UNRESOLVED_ufixed) return STD_ULOGIC is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_UNSIGNED (lresize'length-1 downto 0);
begin -- ?>
if ((l'length < 1) or (r'length < 1)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """?>"": null detected, returning X"
severity warning;
return 'X';
else
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_uns (lresize);
rslv := to_uns (rresize);
return lslv ?> rslv;
end if;
end function "?>";
function "?>=" (L, R : UNRESOLVED_ufixed) return STD_ULOGIC is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_UNSIGNED (lresize'length-1 downto 0);
begin -- ?>=
if ((l'length < 1) or (r'length < 1)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """?>="": null detected, returning X"
severity warning;
return 'X';
else
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_uns (lresize);
rslv := to_uns (rresize);
return lslv ?>= rslv;
end if;
end function "?>=";
function "?<" (L, R : UNRESOLVED_ufixed) return STD_ULOGIC is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_UNSIGNED (lresize'length-1 downto 0);
begin -- ?<
if ((l'length < 1) or (r'length < 1)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """?<"": null detected, returning X"
severity warning;
return 'X';
else
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_uns (lresize);
rslv := to_uns (rresize);
return lslv ?< rslv;
end if;
end function "?<";
function "?<=" (L, R : UNRESOLVED_ufixed) return STD_ULOGIC is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_UNSIGNED (lresize'length-1 downto 0);
begin -- ?<=
if ((l'length < 1) or (r'length < 1)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """?<="": null detected, returning X"
severity warning;
return 'X';
else
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_uns (lresize);
rslv := to_uns (rresize);
return lslv ?<= rslv;
end if;
end function "?<=";
function "?=" (L, R : UNRESOLVED_sfixed) return STD_ULOGIC is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_SIGNED (lresize'length-1 downto 0);
begin -- ?=
if ((L'length < 1) or (R'length < 1)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """?="": null detected, returning X"
severity warning;
return 'X';
else
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_s (lresize);
rslv := to_s (rresize);
return lslv ?= rslv;
end if;
end function "?=";
function "?/=" (L, R : UNRESOLVED_sfixed) return STD_ULOGIC is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_SIGNED (lresize'length-1 downto 0);
begin -- ?/=
if ((L'length < 1) or (R'length < 1)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """?/="": null detected, returning X"
severity warning;
return 'X';
else
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_s (lresize);
rslv := to_s (rresize);
return lslv ?/= rslv;
end if;
end function "?/=";
function "?>" (L, R : UNRESOLVED_sfixed) return STD_ULOGIC is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_SIGNED (lresize'length-1 downto 0);
begin -- ?>
if ((l'length < 1) or (r'length < 1)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """?>"": null detected, returning X"
severity warning;
return 'X';
else
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_s (lresize);
rslv := to_s (rresize);
return lslv ?> rslv;
end if;
end function "?>";
function "?>=" (L, R : UNRESOLVED_sfixed) return STD_ULOGIC is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_SIGNED (lresize'length-1 downto 0);
begin -- ?>=
if ((l'length < 1) or (r'length < 1)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """?>="": null detected, returning X"
severity warning;
return 'X';
else
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_s (lresize);
rslv := to_s (rresize);
return lslv ?>= rslv;
end if;
end function "?>=";
function "?<" (L, R : UNRESOLVED_sfixed) return STD_ULOGIC is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_SIGNED (lresize'length-1 downto 0);
begin -- ?<
if ((l'length < 1) or (r'length < 1)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """?<"": null detected, returning X"
severity warning;
return 'X';
else
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_s (lresize);
rslv := to_s (rresize);
return lslv ?< rslv;
end if;
end function "?<";
function "?<=" (L, R : UNRESOLVED_sfixed) return STD_ULOGIC is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_SIGNED (lresize'length-1 downto 0);
begin -- ?<=
if ((l'length < 1) or (r'length < 1)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """?<="": null detected, returning X"
severity warning;
return 'X';
else
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_s (lresize);
rslv := to_s (rresize);
return lslv ?<= rslv;
end if;
end function "?<=";
-- Match function, similar to "std_match" from numeric_std
function std_match (L, R : UNRESOLVED_ufixed) return BOOLEAN is
begin
if (L'high = R'high and L'low = R'low) then
return std_match(to_sulv(L), to_sulv(R));
else
assert NO_WARNING
report fixed_generic_pkg'instance_name
& "STD_MATCH: L'RANGE /= R'RANGE, returning FALSE"
severity warning;
return false;
end if;
end function std_match;
function std_match (L, R : UNRESOLVED_sfixed) return BOOLEAN is
begin
if (L'high = R'high and L'low = R'low) then
return std_match(to_sulv(L), to_sulv(R));
else
assert NO_WARNING
report fixed_generic_pkg'instance_name
& "STD_MATCH: L'RANGE /= R'RANGE, returning FALSE"
severity warning;
return false;
end if;
end function std_match;
-- compare functions
function "=" (
l, r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN
is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_UNSIGNED (lresize'length-1 downto 0);
begin
if (l'length < 1 or r'length < 1) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """="": null argument detected, returning FALSE"
severity warning;
return false;
elsif (Is_X(l) or Is_X(r)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """="": metavalue detected, returning FALSE"
severity warning;
return false;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_uns (lresize);
rslv := to_uns (rresize);
return lslv = rslv;
end function "=";
function "=" (
l, r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN
is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_SIGNED (lresize'length-1 downto 0);
begin
if (l'length < 1 or r'length < 1) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """="": null argument detected, returning FALSE"
severity warning;
return false;
elsif (Is_X(l) or Is_X(r)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """="": metavalue detected, returning FALSE"
severity warning;
return false;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_s (lresize);
rslv := to_s (rresize);
return lslv = rslv;
end function "=";
function "/=" (
l, r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN
is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_UNSIGNED (lresize'length-1 downto 0);
begin
if (l'length < 1 or r'length < 1) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """/="": null argument detected, returning TRUE"
severity warning;
return true;
elsif (Is_X(l) or Is_X(r)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """/="": metavalue detected, returning TRUE"
severity warning;
return true;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_uns (lresize);
rslv := to_uns (rresize);
return lslv /= rslv;
end function "/=";
function "/=" (
l, r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN
is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_SIGNED (lresize'length-1 downto 0);
begin
if (l'length < 1 or r'length < 1) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """/="": null argument detected, returning TRUE"
severity warning;
return true;
elsif (Is_X(l) or Is_X(r)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """/="": metavalue detected, returning TRUE"
severity warning;
return true;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_s (lresize);
rslv := to_s (rresize);
return lslv /= rslv;
end function "/=";
function ">" (
l, r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN
is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_UNSIGNED (lresize'length-1 downto 0);
begin
if (l'length < 1 or r'length < 1) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """>"": null argument detected, returning FALSE"
severity warning;
return false;
elsif (Is_X(l) or Is_X(r)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """>"": metavalue detected, returning FALSE"
severity warning;
return false;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_uns (lresize);
rslv := to_uns (rresize);
return lslv > rslv;
end function ">";
function ">" (
l, r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN
is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_SIGNED (lresize'length-1 downto 0);
begin
if (l'length < 1 or r'length < 1) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """>"": null argument detected, returning FALSE"
severity warning;
return false;
elsif (Is_X(l) or Is_X(r)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """>"": metavalue detected, returning FALSE"
severity warning;
return false;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_s (lresize);
rslv := to_s (rresize);
return lslv > rslv;
end function ">";
function "<" (
l, r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN
is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_UNSIGNED (lresize'length-1 downto 0);
begin
if (l'length < 1 or r'length < 1) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """<"": null argument detected, returning FALSE"
severity warning;
return false;
elsif (Is_X(l) or Is_X(r)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """<"": metavalue detected, returning FALSE"
severity warning;
return false;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_uns (lresize);
rslv := to_uns (rresize);
return lslv < rslv;
end function "<";
function "<" (
l, r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN
is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_SIGNED (lresize'length-1 downto 0);
begin
if (l'length < 1 or r'length < 1) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """<"": null argument detected, returning FALSE"
severity warning;
return false;
elsif (Is_X(l) or Is_X(r)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """<"": metavalue detected, returning FALSE"
severity warning;
return false;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_s (lresize);
rslv := to_s (rresize);
return lslv < rslv;
end function "<";
function ">=" (
l, r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN
is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_UNSIGNED (lresize'length-1 downto 0);
begin
if (l'length < 1 or r'length < 1) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """>="": null argument detected, returning FALSE"
severity warning;
return false;
elsif (Is_X(l) or Is_X(r)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """>="": metavalue detected, returning FALSE"
severity warning;
return false;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_uns (lresize);
rslv := to_uns (rresize);
return lslv >= rslv;
end function ">=";
function ">=" (
l, r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN
is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_SIGNED (lresize'length-1 downto 0);
begin
if (l'length < 1 or r'length < 1) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """>="": null argument detected, returning FALSE"
severity warning;
return false;
elsif (Is_X(l) or Is_X(r)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """>="": metavalue detected, returning FALSE"
severity warning;
return false;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_s (lresize);
rslv := to_s (rresize);
return lslv >= rslv;
end function ">=";
function "<=" (
l, r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN
is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_UNSIGNED (lresize'length-1 downto 0);
begin
if (l'length < 1 or r'length < 1) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """<="": null argument detected, returning FALSE"
severity warning;
return false;
elsif (Is_X(l) or Is_X(r)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """<="": metavalue detected, returning FALSE"
severity warning;
return false;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_uns (lresize);
rslv := to_uns (rresize);
return lslv <= rslv;
end function "<=";
function "<=" (
l, r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN
is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_SIGNED (lresize'length-1 downto 0);
begin
if (l'length < 1 or r'length < 1) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """<="": null argument detected, returning FALSE"
severity warning;
return false;
elsif (Is_X(l) or Is_X(r)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """<="": metavalue detected, returning FALSE"
severity warning;
return false;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_s (lresize);
rslv := to_s (rresize);
return lslv <= rslv;
end function "<=";
-- overloads of the default maximum and minimum functions
function maximum (l, r : UNRESOLVED_ufixed) return UNRESOLVED_ufixed is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
begin
if (l'length < 1 or r'length < 1) then
return NAUF;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
return to_fixed(maximum(to_uns(lresize), to_uns(rresize)),
left_index, right_index);
end function maximum;
function maximum (l, r : UNRESOLVED_sfixed) return UNRESOLVED_sfixed is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
begin
if (l'length < 1 or r'length < 1) then
return NASF;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
return to_fixed(maximum(to_s(lresize), to_s(rresize)),
left_index, right_index);
end function maximum;
function minimum (l, r : UNRESOLVED_ufixed) return UNRESOLVED_ufixed is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
begin
if (l'length < 1 or r'length < 1) then
return NAUF;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
return to_fixed(minimum(to_uns(lresize), to_uns(rresize)),
left_index, right_index);
end function minimum;
function minimum (l, r : UNRESOLVED_sfixed) return UNRESOLVED_sfixed is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
begin
if (l'length < 1 or r'length < 1) then
return NASF;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
return to_fixed(minimum(to_s(lresize), to_s(rresize)),
left_index, right_index);
end function minimum;
function to_ufixed (
arg : NATURAL; -- integer
constant left_index : INTEGER; -- left index (high index)
constant right_index : INTEGER := 0; -- right index
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_ufixed
is
constant fw : INTEGER := mins (right_index, right_index); -- catch literals
variable result : UNRESOLVED_ufixed (left_index downto fw);
variable sresult : UNRESOLVED_ufixed (left_index downto 0) :=
(others => '0'); -- integer portion
variable argx : NATURAL; -- internal version of arg
begin
if (result'length < 1) then
return NAUF;
end if;
if arg /= 0 then
argx := arg;
for I in 0 to sresult'left loop
if (argx mod 2) = 0 then
sresult(I) := '0';
else
sresult(I) := '1';
end if;
argx := argx/2;
end loop;
if argx /= 0 then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& "TO_UFIXED(NATURAL): vector truncated"
severity warning;
if overflow_style = fixed_saturate then
return saturate (left_index, right_index);
end if;
end if;
result := resize (arg => sresult,
left_index => left_index,
right_index => right_index,
round_style => round_style,
overflow_style => overflow_style);
else
result := (others => '0');
end if;
return result;
end function to_ufixed;
function to_sfixed (
arg : INTEGER; -- integer
constant left_index : INTEGER; -- left index (high index)
constant right_index : INTEGER := 0; -- right index
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_sfixed
is
constant fw : INTEGER := mins (right_index, right_index); -- catch literals
variable result : UNRESOLVED_sfixed (left_index downto fw);
variable sresult : UNRESOLVED_sfixed (left_index downto 0) :=
(others => '0'); -- integer portion
variable argx : INTEGER; -- internal version of arg
variable sign : STD_ULOGIC; -- sign of input
begin
if (result'length < 1) then -- null range
return NASF;
end if;
if arg /= 0 then
if (arg < 0) then
sign := '1';
argx := -(arg + 1);
else
sign := '0';
argx := arg;
end if;
for I in 0 to sresult'left loop
if (argx mod 2) = 0 then
sresult(I) := sign;
else
sresult(I) := not sign;
end if;
argx := argx/2;
end loop;
if argx /= 0 or left_index < 0 or sign /= sresult(sresult'left) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& "TO_SFIXED(INTEGER): vector truncated"
severity warning;
if overflow_style = fixed_saturate then -- saturate
if arg < 0 then
result := not saturate (result'high, result'low); -- underflow
else
result := saturate (result'high, result'low); -- overflow
end if;
return result;
end if;
end if;
result := resize (arg => sresult,
left_index => left_index,
right_index => right_index,
round_style => round_style,
overflow_style => overflow_style);
else
result := (others => '0');
end if;
return result;
end function to_sfixed;
function to_ufixed (
arg : REAL; -- real
constant left_index : INTEGER; -- left index (high index)
constant right_index : INTEGER; -- right index
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style;
constant guard_bits : NATURAL := fixed_guard_bits) -- # of guard bits
return UNRESOLVED_ufixed
is
constant fw : INTEGER := mins (right_index, right_index); -- catch literals
variable result : UNRESOLVED_ufixed (left_index downto fw) :=
(others => '0');
variable Xresult : UNRESOLVED_ufixed (left_index downto
fw-guard_bits) :=
(others => '0');
variable presult : REAL;
begin
-- If negative or null range, return.
if (left_index < fw) then
return NAUF;
end if;
if (arg < 0.0) then
report fixed_generic_pkg'instance_name
& "TO_UFIXED: Negative argument passed "
& REAL'image(arg) severity error;
return result;
end if;
presult := arg;
if presult >= (2.0**(left_index+1)) then
assert NO_WARNING report fixed_generic_pkg'instance_name
& "TO_UFIXED(REAL): vector truncated"
severity warning;
if overflow_style = fixed_wrap then
presult := presult mod (2.0**(left_index+1)); -- wrap
else
return saturate (result'high, result'low);
end if;
end if;
for i in Xresult'range loop
if presult >= 2.0**i then
Xresult(i) := '1';
presult := presult - 2.0**i;
else
Xresult(i) := '0';
end if;
end loop;
if guard_bits > 0 and round_style = fixed_round then
result := round_fixed (arg => Xresult (left_index
downto right_index),
remainder => Xresult (right_index-1 downto
right_index-guard_bits),
overflow_style => overflow_style);
else
result := Xresult (result'range);
end if;
return result;
end function to_ufixed;
function to_sfixed (
arg : REAL; -- real
constant left_index : INTEGER; -- left index (high index)
constant right_index : INTEGER; -- right index
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style;
constant guard_bits : NATURAL := fixed_guard_bits) -- # of guard bits
return UNRESOLVED_sfixed
is
constant fw : INTEGER := mins (right_index, right_index); -- catch literals
variable result : UNRESOLVED_sfixed (left_index downto fw) :=
(others => '0');
variable Xresult : UNRESOLVED_sfixed (left_index+1 downto fw-guard_bits) :=
(others => '0');
variable presult : REAL;
begin
if (left_index < fw) then -- null range
return NASF;
end if;
if (arg >= (2.0**left_index) or arg < -(2.0**left_index)) then
assert NO_WARNING report fixed_generic_pkg'instance_name
& "TO_SFIXED(REAL): vector truncated"
severity warning;
if overflow_style = fixed_saturate then
if arg < 0.0 then -- saturate
result := not saturate (result'high, result'low); -- underflow
else
result := saturate (result'high, result'low); -- overflow
end if;
return result;
else
presult := abs(arg) mod (2.0**(left_index+1)); -- wrap
end if;
else
presult := abs(arg);
end if;
for i in Xresult'range loop
if presult >= 2.0**i then
Xresult(i) := '1';
presult := presult - 2.0**i;
else
Xresult(i) := '0';
end if;
end loop;
if arg < 0.0 then
Xresult := to_fixed(-to_s(Xresult), Xresult'high, Xresult'low);
end if;
if guard_bits > 0 and round_style = fixed_round then
result := round_fixed (arg => Xresult (left_index
downto right_index),
remainder => Xresult (right_index-1 downto
right_index-guard_bits),
overflow_style => overflow_style);
else
result := Xresult (result'range);
end if;
return result;
end function to_sfixed;
function to_ufixed (
arg : UNRESOLVED_UNSIGNED; -- unsigned
constant left_index : INTEGER; -- left index (high index)
constant right_index : INTEGER := 0; -- right index
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_ufixed
is
constant ARG_LEFT : INTEGER := ARG'length-1;
alias XARG : UNRESOLVED_UNSIGNED(ARG_LEFT downto 0) is ARG;
variable result : UNRESOLVED_ufixed (left_index downto right_index);
begin
if arg'length < 1 or (left_index < right_index) then
return NAUF;
end if;
result := resize (arg => UNRESOLVED_ufixed (XARG),
left_index => left_index,
right_index => right_index,
round_style => round_style,
overflow_style => overflow_style);
return result;
end function to_ufixed;
-- converted version
function to_ufixed (
arg : UNRESOLVED_UNSIGNED) -- unsigned
return UNRESOLVED_ufixed
is
constant ARG_LEFT : INTEGER := ARG'length-1;
alias XARG : UNRESOLVED_UNSIGNED(ARG_LEFT downto 0) is ARG;
begin
if arg'length < 1 then
return NAUF;
end if;
return UNRESOLVED_ufixed(xarg);
end function to_ufixed;
function to_sfixed (
arg : UNRESOLVED_SIGNED; -- signed
constant left_index : INTEGER; -- left index (high index)
constant right_index : INTEGER := 0; -- right index
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_sfixed
is
constant ARG_LEFT : INTEGER := ARG'length-1;
alias XARG : UNRESOLVED_SIGNED(ARG_LEFT downto 0) is ARG;
variable result : UNRESOLVED_sfixed (left_index downto right_index);
begin
if arg'length < 1 or (left_index < right_index) then
return NASF;
end if;
result := resize (arg => UNRESOLVED_sfixed (XARG),
left_index => left_index,
right_index => right_index,
round_style => round_style,
overflow_style => overflow_style);
return result;
end function to_sfixed;
-- converted version
function to_sfixed (
arg : UNRESOLVED_SIGNED) -- signed
return UNRESOLVED_sfixed
is
constant ARG_LEFT : INTEGER := ARG'length-1;
alias XARG : UNRESOLVED_SIGNED(ARG_LEFT downto 0) is ARG;
begin
if arg'length < 1 then
return NASF;
end if;
return UNRESOLVED_sfixed(xarg);
end function to_sfixed;
function to_sfixed (arg : UNRESOLVED_ufixed) return UNRESOLVED_sfixed is
variable result : UNRESOLVED_sfixed (arg'high+1 downto arg'low);
begin
if arg'length < 1 then
return NASF;
end if;
result (arg'high downto arg'low) := UNRESOLVED_sfixed(cleanvec(arg));
result (arg'high+1) := '0';
return result;
end function to_sfixed;
-- Because of the fairly complicated sizing rules in the fixed point
-- packages these functions are provided to compute the result ranges
-- Example:
-- signal uf1 : ufixed (3 downto -3);
-- signal uf2 : ufixed (4 downto -2);
-- signal uf1multuf2 : ufixed (ufixed_high (3, -3, '*', 4, -2) downto
-- ufixed_low (3, -3, '*', 4, -2));
-- uf1multuf2 <= uf1 * uf2;
-- Valid characters: '+', '-', '*', '/', 'r' or 'R' (rem), 'm' or 'M' (mod),
-- '1' (reciprocal), 'A', 'a' (abs), 'N', 'n' (-sfixed)
function ufixed_high (left_index, right_index : INTEGER;
operation : CHARACTER := 'X';
left_index2, right_index2 : INTEGER := 0)
return INTEGER is
begin
case operation is
when '+'| '-' => return maximum (left_index, left_index2) + 1;
when '*' => return left_index + left_index2 + 1;
when '/' => return left_index - right_index2;
when '1' => return -right_index; -- reciprocal
when 'R'|'r' => return mins (left_index, left_index2); -- "rem"
when 'M'|'m' => return mins (left_index, left_index2); -- "mod"
when others => return left_index; -- For abs and default
end case;
end function ufixed_high;
function ufixed_low (left_index, right_index : INTEGER;
operation : CHARACTER := 'X';
left_index2, right_index2 : INTEGER := 0)
return INTEGER is
begin
case operation is
when '+'| '-' => return mins (right_index, right_index2);
when '*' => return right_index + right_index2;
when '/' => return right_index - left_index2 - 1;
when '1' => return -left_index - 1; -- reciprocal
when 'R'|'r' => return mins (right_index, right_index2); -- "rem"
when 'M'|'m' => return mins (right_index, right_index2); -- "mod"
when others => return right_index; -- for abs and default
end case;
end function ufixed_low;
function sfixed_high (left_index, right_index : INTEGER;
operation : CHARACTER := 'X';
left_index2, right_index2 : INTEGER := 0)
return INTEGER is
begin
case operation is
when '+'| '-' => return maximum (left_index, left_index2) + 1;
when '*' => return left_index + left_index2 + 1;
when '/' => return left_index - right_index2 + 1;
when '1' => return -right_index + 1; -- reciprocal
when 'R'|'r' => return mins (left_index, left_index2); -- "rem"
when 'M'|'m' => return left_index2; -- "mod"
when 'A'|'a' => return left_index + 1; -- "abs"
when 'N'|'n' => return left_index + 1; -- -sfixed
when others => return left_index;
end case;
end function sfixed_high;
function sfixed_low (left_index, right_index : INTEGER;
operation : CHARACTER := 'X';
left_index2, right_index2 : INTEGER := 0)
return INTEGER is
begin
case operation is
when '+'| '-' => return mins (right_index, right_index2);
when '*' => return right_index + right_index2;
when '/' => return right_index - left_index2;
when '1' => return -left_index; -- reciprocal
when 'R'|'r' => return mins (right_index, right_index2); -- "rem"
when 'M'|'m' => return mins (right_index, right_index2); -- "mod"
when others => return right_index; -- default for abs, neg and default
end case;
end function sfixed_low;
-- Same as above, but using the "size_res" input only for their ranges:
-- signal uf1multuf2 : ufixed (ufixed_high (uf1, '*', uf2) downto
-- ufixed_low (uf1, '*', uf2));
-- uf1multuf2 <= uf1 * uf2;
function ufixed_high (size_res : UNRESOLVED_ufixed;
operation : CHARACTER := 'X';
size_res2 : UNRESOLVED_ufixed)
return INTEGER is
begin
return ufixed_high (left_index => size_res'high,
right_index => size_res'low,
operation => operation,
left_index2 => size_res2'high,
right_index2 => size_res2'low);
end function ufixed_high;
function ufixed_low (size_res : UNRESOLVED_ufixed;
operation : CHARACTER := 'X';
size_res2 : UNRESOLVED_ufixed)
return INTEGER is
begin
return ufixed_low (left_index => size_res'high,
right_index => size_res'low,
operation => operation,
left_index2 => size_res2'high,
right_index2 => size_res2'low);
end function ufixed_low;
function sfixed_high (size_res : UNRESOLVED_sfixed;
operation : CHARACTER := 'X';
size_res2 : UNRESOLVED_sfixed)
return INTEGER is
begin
return sfixed_high (left_index => size_res'high,
right_index => size_res'low,
operation => operation,
left_index2 => size_res2'high,
right_index2 => size_res2'low);
end function sfixed_high;
function sfixed_low (size_res : UNRESOLVED_sfixed;
operation : CHARACTER := 'X';
size_res2 : UNRESOLVED_sfixed)
return INTEGER is
begin
return sfixed_low (left_index => size_res'high,
right_index => size_res'low,
operation => operation,
left_index2 => size_res2'high,
right_index2 => size_res2'low);
end function sfixed_low;
-- purpose: returns a saturated number
function saturate (
constant left_index : INTEGER;
constant right_index : INTEGER)
return UNRESOLVED_ufixed
is
constant sat : UNRESOLVED_ufixed (left_index downto right_index) :=
(others => '1');
begin
return sat;
end function saturate;
-- purpose: returns a saturated number
function saturate (
constant left_index : INTEGER;
constant right_index : INTEGER)
return UNRESOLVED_sfixed
is
variable sat : UNRESOLVED_sfixed (left_index downto right_index) :=
(others => '1');
begin
-- saturate positive, to saturate negative, just do "not saturate()"
sat (left_index) := '0';
return sat;
end function saturate;
function saturate (
size_res : UNRESOLVED_ufixed) -- only the size of this is used
return UNRESOLVED_ufixed is
begin
return saturate (size_res'high, size_res'low);
end function saturate;
function saturate (
size_res : UNRESOLVED_sfixed) -- only the size of this is used
return UNRESOLVED_sfixed is
begin
return saturate (size_res'high, size_res'low);
end function saturate;
-- As a concession to those who use a graphical DSP environment,
-- these functions take parameters in those tools format and create
-- fixed point numbers. These functions are designed to convert from
-- a std_logic_vector to the VHDL fixed point format using the conventions
-- of these packages. In a pure VHDL environment you should use the
-- "to_ufixed" and "to_sfixed" routines.
-- Unsigned fixed point
function to_UFix (
arg : STD_ULOGIC_VECTOR;
width : NATURAL; -- width of vector
fraction : NATURAL) -- width of fraction
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (width-fraction-1 downto -fraction);
begin
if (arg'length /= result'length) then
report fixed_generic_pkg'instance_name
& "TO_UFIX (STD_ULOGIC_VECTOR) "
& "Vector lengths do not match. Input length is "
& INTEGER'image(arg'length) & " and output will be "
& INTEGER'image(result'length) & " wide."
severity error;
return NAUF;
else
result := to_ufixed (arg, result'high, result'low);
return result;
end if;
end function to_UFix;
-- signed fixed point
function to_SFix (
arg : STD_ULOGIC_VECTOR;
width : NATURAL; -- width of vector
fraction : NATURAL) -- width of fraction
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (width-fraction-1 downto -fraction);
begin
if (arg'length /= result'length) then
report fixed_generic_pkg'instance_name
& "TO_SFIX (STD_ULOGIC_VECTOR) "
& "Vector lengths do not match. Input length is "
& INTEGER'image(arg'length) & " and output will be "
& INTEGER'image(result'length) & " wide."
severity error;
return NASF;
else
result := to_sfixed (arg, result'high, result'low);
return result;
end if;
end function to_SFix;
-- finding the bounds of a number. These functions can be used like this:
-- signal xxx : ufixed (7 downto -3);
-- -- Which is the same as "ufixed (UFix_high (11,3) downto UFix_low(11,3))"
-- signal yyy : ufixed (UFix_high (11, 3, "+", 11, 3)
-- downto UFix_low(11, 3, "+", 11, 3));
-- Where "11" is the width of xxx (xxx'length),
-- and 3 is the lower bound (abs (xxx'low))
-- In a pure VHDL environment use "ufixed_high" and "ufixed_low"
function ufix_high (
width, fraction : NATURAL;
operation : CHARACTER := 'X';
width2, fraction2 : NATURAL := 0)
return INTEGER is
begin
return ufixed_high (left_index => width - 1 - fraction,
right_index => -fraction,
operation => operation,
left_index2 => width2 - 1 - fraction2,
right_index2 => -fraction2);
end function ufix_high;
function ufix_low (
width, fraction : NATURAL;
operation : CHARACTER := 'X';
width2, fraction2 : NATURAL := 0)
return INTEGER is
begin
return ufixed_low (left_index => width - 1 - fraction,
right_index => -fraction,
operation => operation,
left_index2 => width2 - 1 - fraction2,
right_index2 => -fraction2);
end function ufix_low;
function sfix_high (
width, fraction : NATURAL;
operation : CHARACTER := 'X';
width2, fraction2 : NATURAL := 0)
return INTEGER is
begin
return sfixed_high (left_index => width - fraction,
right_index => -fraction,
operation => operation,
left_index2 => width2 - fraction2,
right_index2 => -fraction2);
end function sfix_high;
function sfix_low (
width, fraction : NATURAL;
operation : CHARACTER := 'X';
width2, fraction2 : NATURAL := 0)
return INTEGER is
begin
return sfixed_low (left_index => width - fraction,
right_index => -fraction,
operation => operation,
left_index2 => width2 - fraction2,
right_index2 => -fraction2);
end function sfix_low;
function to_unsigned (
arg : UNRESOLVED_ufixed; -- ufixed point input
constant size : NATURAL; -- length of output
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_UNSIGNED is
begin
return to_uns(resize (arg => arg,
left_index => size-1,
right_index => 0,
round_style => round_style,
overflow_style => overflow_style));
end function to_unsigned;
function to_unsigned (
arg : UNRESOLVED_ufixed; -- ufixed point input
size_res : UNRESOLVED_UNSIGNED; -- length of output
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_UNSIGNED is
begin
return to_unsigned (arg => arg,
size => size_res'length,
round_style => round_style,
overflow_style => overflow_style);
end function to_unsigned;
function to_signed (
arg : UNRESOLVED_sfixed; -- sfixed point input
constant size : NATURAL; -- length of output
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_SIGNED is
begin
return to_s(resize (arg => arg,
left_index => size-1,
right_index => 0,
round_style => round_style,
overflow_style => overflow_style));
end function to_signed;
function to_signed (
arg : UNRESOLVED_sfixed; -- sfixed point input
size_res : UNRESOLVED_SIGNED; -- used for length of output
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_SIGNED is
begin
return to_signed (arg => arg,
size => size_res'length,
round_style => round_style,
overflow_style => overflow_style);
end function to_signed;
function to_real (
arg : UNRESOLVED_ufixed) -- ufixed point input
return REAL
is
constant left_index : INTEGER := arg'high;
constant right_index : INTEGER := arg'low;
variable result : REAL; -- result
variable arg_int : UNRESOLVED_ufixed (left_index downto right_index);
begin
if (arg'length < 1) then
return 0.0;
end if;
arg_int := to_x01(cleanvec(arg));
if (Is_X(arg_int)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& "TO_REAL (ufixed): metavalue detected, returning 0.0"
severity warning;
return 0.0;
end if;
result := 0.0;
for i in arg_int'range loop
if (arg_int(i) = '1') then
result := result + (2.0**i);
end if;
end loop;
return result;
end function to_real;
function to_real (
arg : UNRESOLVED_sfixed) -- ufixed point input
return REAL
is
constant left_index : INTEGER := arg'high;
constant right_index : INTEGER := arg'low;
variable result : REAL; -- result
variable arg_int : UNRESOLVED_sfixed (left_index downto right_index);
-- unsigned version of argument
variable arg_uns : UNRESOLVED_ufixed (left_index downto right_index);
-- absolute of argument
begin
if (arg'length < 1) then
return 0.0;
end if;
arg_int := to_x01(cleanvec(arg));
if (Is_X(arg_int)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& "TO_REAL (sfixed): metavalue detected, returning 0.0"
severity warning;
return 0.0;
end if;
arg_uns := to_ufixed (arg_int);
result := to_real (arg_uns);
if (arg_int(arg_int'high) = '1') then
result := -result;
end if;
return result;
end function to_real;
function to_integer (
arg : UNRESOLVED_ufixed; -- fixed point input
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return NATURAL
is
constant left_index : INTEGER := arg'high;
variable arg_uns : UNRESOLVED_UNSIGNED (left_index+1 downto 0)
:= (others => '0');
begin
if (arg'length < 1) then
return 0;
end if;
if (Is_X (arg)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& "TO_INTEGER (ufixed): metavalue detected, returning 0"
severity warning;
return 0;
end if;
if (left_index < -1) then
return 0;
end if;
arg_uns := to_uns(resize (arg => arg,
left_index => arg_uns'high,
right_index => 0,
round_style => round_style,
overflow_style => overflow_style));
return to_integer (arg_uns);
end function to_integer;
function to_integer (
arg : UNRESOLVED_sfixed; -- fixed point input
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return INTEGER
is
constant left_index : INTEGER := arg'high;
constant right_index : INTEGER := arg'low;
variable arg_s : UNRESOLVED_SIGNED (left_index+1 downto 0);
begin
if (arg'length < 1) then
return 0;
end if;
if (Is_X (arg)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& "TO_INTEGER (sfixed): metavalue detected, returning 0"
severity warning;
return 0;
end if;
if (left_index < -1) then
return 0;
end if;
arg_s := to_s(resize (arg => arg,
left_index => arg_s'high,
right_index => 0,
round_style => round_style,
overflow_style => overflow_style));
return to_integer (arg_s);
end function to_integer;
function to_01 (
s : UNRESOLVED_ufixed; -- ufixed point input
constant XMAP : STD_ULOGIC := '0') -- Map x to
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (s'range); -- result
begin
if (s'length < 1) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& "TO_01(ufixed): null detected, returning NULL"
severity warning;
return NAUF;
end if;
return to_fixed (to_01(to_uns(s), XMAP), s'high, s'low);
end function to_01;
function to_01 (
s : UNRESOLVED_sfixed; -- sfixed point input
constant XMAP : STD_ULOGIC := '0') -- Map x to
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (s'range);
begin
if (s'length < 1) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& "TO_01(sfixed): null detected, returning NULL"
severity warning;
return NASF;
end if;
return to_fixed (to_01(to_s(s), XMAP), s'high, s'low);
end function to_01;
function Is_X (
arg : UNRESOLVED_ufixed)
return BOOLEAN
is
variable argslv : STD_ULOGIC_VECTOR (arg'length-1 downto 0); -- slv
begin
argslv := to_sulv(arg);
return Is_X (argslv);
end function Is_X;
function Is_X (
arg : UNRESOLVED_sfixed)
return BOOLEAN
is
variable argslv : STD_ULOGIC_VECTOR (arg'length-1 downto 0); -- slv
begin
argslv := to_sulv(arg);
return Is_X (argslv);
end function Is_X;
function To_X01 (
arg : UNRESOLVED_ufixed)
return UNRESOLVED_ufixed is
begin
return to_ufixed (To_X01(to_sulv(arg)), arg'high, arg'low);
end function To_X01;
function to_X01 (
arg : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed is
begin
return to_sfixed (To_X01(to_sulv(arg)), arg'high, arg'low);
end function To_X01;
function To_X01Z (
arg : UNRESOLVED_ufixed)
return UNRESOLVED_ufixed is
begin
return to_ufixed (To_X01Z(to_sulv(arg)), arg'high, arg'low);
end function To_X01Z;
function to_X01Z (
arg : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed is
begin
return to_sfixed (To_X01Z(to_sulv(arg)), arg'high, arg'low);
end function To_X01Z;
function To_UX01 (
arg : UNRESOLVED_ufixed)
return UNRESOLVED_ufixed is
begin
return to_ufixed (To_UX01(to_sulv(arg)), arg'high, arg'low);
end function To_UX01;
function to_UX01 (
arg : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed is
begin
return to_sfixed (To_UX01(to_sulv(arg)), arg'high, arg'low);
end function To_UX01;
function resize (
arg : UNRESOLVED_ufixed; -- input
constant left_index : INTEGER; -- integer portion
constant right_index : INTEGER; -- size of fraction
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_ufixed
is
constant arghigh : INTEGER := maximum (arg'high, arg'low);
constant arglow : INTEGER := mine (arg'high, arg'low);
variable invec : UNRESOLVED_ufixed (arghigh downto arglow);
variable result : UNRESOLVED_ufixed(left_index downto right_index) :=
(others => '0');
variable needs_rounding : BOOLEAN := false;
begin -- resize
if (arg'length < 1) or (result'length < 1) then
return NAUF;
elsif (invec'length < 1) then
return result; -- string literal value
else
invec := cleanvec(arg);
if (right_index > arghigh) then -- return top zeros
needs_rounding := (round_style = fixed_round) and
(right_index = arghigh+1);
elsif (left_index < arglow) then -- return overflow
if (overflow_style = fixed_saturate) and
(or(to_sulv(invec)) = '1') then
result := saturate (result'high, result'low); -- saturate
end if;
elsif (arghigh > left_index) then
-- wrap or saturate?
if (overflow_style = fixed_saturate and
or (to_sulv(invec(arghigh downto left_index+1))) = '1')
then
result := saturate (result'high, result'low); -- saturate
else
if (arglow >= right_index) then
result (left_index downto arglow) :=
invec(left_index downto arglow);
else
result (left_index downto right_index) :=
invec (left_index downto right_index);
needs_rounding := (round_style = fixed_round); -- round
end if;
end if;
else -- arghigh <= integer width
if (arglow >= right_index) then
result (arghigh downto arglow) := invec;
else
result (arghigh downto right_index) :=
invec (arghigh downto right_index);
needs_rounding := (round_style = fixed_round); -- round
end if;
end if;
-- Round result
if needs_rounding then
result := round_fixed (arg => result,
remainder => invec (right_index-1
downto arglow),
overflow_style => overflow_style);
end if;
return result;
end if;
end function resize;
function resize (
arg : UNRESOLVED_sfixed; -- input
constant left_index : INTEGER; -- integer portion
constant right_index : INTEGER; -- size of fraction
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_sfixed
is
constant arghigh : INTEGER := maximum (arg'high, arg'low);
constant arglow : INTEGER := mine (arg'high, arg'low);
variable invec : UNRESOLVED_sfixed (arghigh downto arglow);
variable result : UNRESOLVED_sfixed(left_index downto right_index) :=
(others => '0');
variable reduced : STD_ULOGIC;
variable needs_rounding : BOOLEAN := false; -- rounding
begin -- resize
if (arg'length < 1) or (result'length < 1) then
return NASF;
elsif (invec'length < 1) then
return result; -- string literal value
else
invec := cleanvec(arg);
if (right_index > arghigh) then -- return top zeros
if (arg'low /= INTEGER'low) then -- check for a literal
result := (others => arg(arghigh)); -- sign extend
end if;
needs_rounding := (round_style = fixed_round) and
(right_index = arghigh+1);
elsif (left_index < arglow) then -- return overflow
if (overflow_style = fixed_saturate) then
reduced := or (to_sulv(invec));
if (reduced = '1') then
if (invec(arghigh) = '0') then
-- saturate POSITIVE
result := saturate (result'high, result'low);
else
-- saturate negative
result := not saturate (result'high, result'low);
end if;
-- else return 0 (input was 0)
end if;
-- else return 0 (wrap)
end if;
elsif (arghigh > left_index) then
if (invec(arghigh) = '0') then
reduced := or (to_sulv(invec(arghigh-1 downto
left_index)));
if overflow_style = fixed_saturate and reduced = '1' then
-- saturate positive
result := saturate (result'high, result'low);
else
if (right_index > arglow) then
result := invec (left_index downto right_index);
needs_rounding := (round_style = fixed_round);
else
result (left_index downto arglow) :=
invec (left_index downto arglow);
end if;
end if;
else
reduced := and (to_sulv(invec(arghigh-1 downto
left_index)));
if overflow_style = fixed_saturate and reduced = '0' then
result := not saturate (result'high, result'low);
else
if (right_index > arglow) then
result := invec (left_index downto right_index);
needs_rounding := (round_style = fixed_round);
else
result (left_index downto arglow) :=
invec (left_index downto arglow);
end if;
end if;
end if;
else -- arghigh <= integer width
if (arglow >= right_index) then
result (arghigh downto arglow) := invec;
else
result (arghigh downto right_index) :=
invec (arghigh downto right_index);
needs_rounding := (round_style = fixed_round); -- round
end if;
if (left_index > arghigh) then -- sign extend
result(left_index downto arghigh+1) := (others => invec(arghigh));
end if;
end if;
-- Round result
if (needs_rounding) then
result := round_fixed (arg => result,
remainder => invec (right_index-1
downto arglow),
overflow_style => overflow_style);
end if;
return result;
end if;
end function resize;
-- size_res functions
-- These functions compute the size from a passed variable named "size_res"
-- The only part of this variable used it it's size, it is never passed
-- to a lower level routine.
function to_ufixed (
arg : STD_ULOGIC_VECTOR; -- shifted vector
size_res : UNRESOLVED_ufixed) -- for size only
return UNRESOLVED_ufixed
is
constant fw : INTEGER := mine (size_res'low, size_res'low); -- catch literals
variable result : UNRESOLVED_ufixed (size_res'left downto fw);
begin
if (result'length < 1 or arg'length < 1) then
return NAUF;
else
result := to_ufixed (arg => arg,
left_index => size_res'high,
right_index => size_res'low);
return result;
end if;
end function to_ufixed;
function to_sfixed (
arg : STD_ULOGIC_VECTOR; -- shifted vector
size_res : UNRESOLVED_sfixed) -- for size only
return UNRESOLVED_sfixed
is
constant fw : INTEGER := mine (size_res'low, size_res'low); -- catch literals
variable result : UNRESOLVED_sfixed (size_res'left downto fw);
begin
if (result'length < 1 or arg'length < 1) then
return NASF;
else
result := to_sfixed (arg => arg,
left_index => size_res'high,
right_index => size_res'low);
return result;
end if;
end function to_sfixed;
function to_ufixed (
arg : NATURAL; -- integer
size_res : UNRESOLVED_ufixed; -- for size only
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_ufixed
is
constant fw : INTEGER := mine (size_res'low, size_res'low); -- catch literals
variable result : UNRESOLVED_ufixed (size_res'left downto fw);
begin
if (result'length < 1) then
return NAUF;
else
result := to_ufixed (arg => arg,
left_index => size_res'high,
right_index => size_res'low,
round_style => round_style,
overflow_style => overflow_style);
return result;
end if;
end function to_ufixed;
function to_sfixed (
arg : INTEGER; -- integer
size_res : UNRESOLVED_sfixed; -- for size only
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_sfixed
is
constant fw : INTEGER := mine (size_res'low, size_res'low); -- catch literals
variable result : UNRESOLVED_sfixed (size_res'left downto fw);
begin
if (result'length < 1) then
return NASF;
else
result := to_sfixed (arg => arg,
left_index => size_res'high,
right_index => size_res'low,
round_style => round_style,
overflow_style => overflow_style);
return result;
end if;
end function to_sfixed;
function to_ufixed (
arg : REAL; -- real
size_res : UNRESOLVED_ufixed; -- for size only
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style;
constant guard_bits : NATURAL := fixed_guard_bits) -- # of guard bits
return UNRESOLVED_ufixed
is
constant fw : INTEGER := mine (size_res'low, size_res'low); -- catch literals
variable result : UNRESOLVED_ufixed (size_res'left downto fw);
begin
if (result'length < 1) then
return NAUF;
else
result := to_ufixed (arg => arg,
left_index => size_res'high,
right_index => size_res'low,
guard_bits => guard_bits,
round_style => round_style,
overflow_style => overflow_style);
return result;
end if;
end function to_ufixed;
function to_sfixed (
arg : REAL; -- real
size_res : UNRESOLVED_sfixed; -- for size only
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style;
constant guard_bits : NATURAL := fixed_guard_bits) -- # of guard bits
return UNRESOLVED_sfixed
is
constant fw : INTEGER := mine (size_res'low, size_res'low); -- catch literals
variable result : UNRESOLVED_sfixed (size_res'left downto fw);
begin
if (result'length < 1) then
return NASF;
else
result := to_sfixed (arg => arg,
left_index => size_res'high,
right_index => size_res'low,
guard_bits => guard_bits,
round_style => round_style,
overflow_style => overflow_style);
return result;
end if;
end function to_sfixed;
function to_ufixed (
arg : UNRESOLVED_UNSIGNED; -- unsigned
size_res : UNRESOLVED_ufixed; -- for size only
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_ufixed
is
constant fw : INTEGER := mine (size_res'low, size_res'low); -- catch literals
variable result : UNRESOLVED_ufixed (size_res'left downto fw);
begin
if (result'length < 1 or arg'length < 1) then
return NAUF;
else
result := to_ufixed (arg => arg,
left_index => size_res'high,
right_index => size_res'low,
round_style => round_style,
overflow_style => overflow_style);
return result;
end if;
end function to_ufixed;
function to_sfixed (
arg : UNRESOLVED_SIGNED; -- signed
size_res : UNRESOLVED_sfixed; -- for size only
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_sfixed
is
constant fw : INTEGER := mine (size_res'low, size_res'low); -- catch literals
variable result : UNRESOLVED_sfixed (size_res'left downto fw);
begin
if (result'length < 1 or arg'length < 1) then
return NASF;
else
result := to_sfixed (arg => arg,
left_index => size_res'high,
right_index => size_res'low,
round_style => round_style,
overflow_style => overflow_style);
return result;
end if;
end function to_sfixed;
function resize (
arg : UNRESOLVED_ufixed; -- input
size_res : UNRESOLVED_ufixed; -- for size only
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_ufixed
is
constant fw : INTEGER := mine (size_res'low, size_res'low); -- catch literals
variable result : UNRESOLVED_ufixed (size_res'high downto fw);
begin
if (result'length < 1 or arg'length < 1) then
return NAUF;
else
result := resize (arg => arg,
left_index => size_res'high,
right_index => size_res'low,
round_style => round_style,
overflow_style => overflow_style);
return result;
end if;
end function resize;
function resize (
arg : UNRESOLVED_sfixed; -- input
size_res : UNRESOLVED_sfixed; -- for size only
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_sfixed
is
constant fw : INTEGER := mine (size_res'low, size_res'low); -- catch literals
variable result : UNRESOLVED_sfixed (size_res'high downto fw);
begin
if (result'length < 1 or arg'length < 1) then
return NASF;
else
result := resize (arg => arg,
left_index => size_res'high,
right_index => size_res'low,
round_style => round_style,
overflow_style => overflow_style);
return result;
end if;
end function resize;
-- Overloaded math functions for real
function "+" (
l : UNRESOLVED_ufixed; -- fixed point input
r : REAL)
return UNRESOLVED_ufixed is
begin
return (l + to_ufixed (r, l'high, l'low));
end function "+";
function "+" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return (to_ufixed (l, r'high, r'low) + r);
end function "+";
function "+" (
l : UNRESOLVED_sfixed; -- fixed point input
r : REAL)
return UNRESOLVED_sfixed is
begin
return (l + to_sfixed (r, l'high, l'low));
end function "+";
function "+" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed is
begin
return (to_sfixed (l, r'high, r'low) + r);
end function "+";
function "-" (
l : UNRESOLVED_ufixed; -- fixed point input
r : REAL)
return UNRESOLVED_ufixed is
begin
return (l - to_ufixed (r, l'high, l'low));
end function "-";
function "-" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return (to_ufixed (l, r'high, r'low) - r);
end function "-";
function "-" (
l : UNRESOLVED_sfixed; -- fixed point input
r : REAL)
return UNRESOLVED_sfixed is
begin
return (l - to_sfixed (r, l'high, l'low));
end function "-";
function "-" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed is
begin
return (to_sfixed (l, r'high, r'low) - r);
end function "-";
function "*" (
l : UNRESOLVED_ufixed; -- fixed point input
r : REAL)
return UNRESOLVED_ufixed is
begin
return (l * to_ufixed (r, l'high, l'low));
end function "*";
function "*" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return (to_ufixed (l, r'high, r'low) * r);
end function "*";
function "*" (
l : UNRESOLVED_sfixed; -- fixed point input
r : REAL)
return UNRESOLVED_sfixed is
begin
return (l * to_sfixed (r, l'high, l'low));
end function "*";
function "*" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed is
begin
return (to_sfixed (l, r'high, r'low) * r);
end function "*";
function "/" (
l : UNRESOLVED_ufixed; -- fixed point input
r : REAL)
return UNRESOLVED_ufixed is
begin
return (l / to_ufixed (r, l'high, l'low));
end function "/";
function "/" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return (to_ufixed (l, r'high, r'low) / r);
end function "/";
function "/" (
l : UNRESOLVED_sfixed; -- fixed point input
r : REAL)
return UNRESOLVED_sfixed is
begin
return (l / to_sfixed (r, l'high, l'low));
end function "/";
function "/" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed is
begin
return (to_sfixed (l, r'high, r'low) / r);
end function "/";
function "rem" (
l : UNRESOLVED_ufixed; -- fixed point input
r : REAL)
return UNRESOLVED_ufixed is
begin
return (l rem to_ufixed (r, l'high, l'low));
end function "rem";
function "rem" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return (to_ufixed (l, r'high, r'low) rem r);
end function "rem";
function "rem" (
l : UNRESOLVED_sfixed; -- fixed point input
r : REAL)
return UNRESOLVED_sfixed is
begin
return (l rem to_sfixed (r, l'high, l'low));
end function "rem";
function "rem" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed is
begin
return (to_sfixed (l, r'high, r'low) rem r);
end function "rem";
function "mod" (
l : UNRESOLVED_ufixed; -- fixed point input
r : REAL)
return UNRESOLVED_ufixed is
begin
return (l mod to_ufixed (r, l'high, l'low));
end function "mod";
function "mod" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return (to_ufixed (l, r'high, r'low) mod r);
end function "mod";
function "mod" (
l : UNRESOLVED_sfixed; -- fixed point input
r : REAL)
return UNRESOLVED_sfixed is
begin
return (l mod to_sfixed (r, l'high, l'low));
end function "mod";
function "mod" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed is
begin
return (to_sfixed (l, r'high, r'low) mod r);
end function "mod";
-- Overloaded math functions for integers
function "+" (
l : UNRESOLVED_ufixed; -- fixed point input
r : NATURAL)
return UNRESOLVED_ufixed is
begin
return (l + to_ufixed (r, l'high, 0));
end function "+";
function "+" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return (to_ufixed (l, r'high, 0) + r);
end function "+";
function "+" (
l : UNRESOLVED_sfixed; -- fixed point input
r : INTEGER)
return UNRESOLVED_sfixed is
begin
return (l + to_sfixed (r, l'high, 0));
end function "+";
function "+" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed is
begin
return (to_sfixed (l, r'high, 0) + r);
end function "+";
-- Overloaded functions
function "-" (
l : UNRESOLVED_ufixed; -- fixed point input
r : NATURAL)
return UNRESOLVED_ufixed is
begin
return (l - to_ufixed (r, l'high, 0));
end function "-";
function "-" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return (to_ufixed (l, r'high, 0) - r);
end function "-";
function "-" (
l : UNRESOLVED_sfixed; -- fixed point input
r : INTEGER)
return UNRESOLVED_sfixed is
begin
return (l - to_sfixed (r, l'high, 0));
end function "-";
function "-" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed is
begin
return (to_sfixed (l, r'high, 0) - r);
end function "-";
-- Overloaded functions
function "*" (
l : UNRESOLVED_ufixed; -- fixed point input
r : NATURAL)
return UNRESOLVED_ufixed is
begin
return (l * to_ufixed (r, l'high, 0));
end function "*";
function "*" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return (to_ufixed (l, r'high, 0) * r);
end function "*";
function "*" (
l : UNRESOLVED_sfixed; -- fixed point input
r : INTEGER)
return UNRESOLVED_sfixed is
begin
return (l * to_sfixed (r, l'high, 0));
end function "*";
function "*" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed is
begin
return (to_sfixed (l, r'high, 0) * r);
end function "*";
-- Overloaded functions
function "/" (
l : UNRESOLVED_ufixed; -- fixed point input
r : NATURAL)
return UNRESOLVED_ufixed is
begin
return (l / to_ufixed (r, l'high, 0));
end function "/";
function "/" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return (to_ufixed (l, r'high, 0) / r);
end function "/";
function "/" (
l : UNRESOLVED_sfixed; -- fixed point input
r : INTEGER)
return UNRESOLVED_sfixed is
begin
return (l / to_sfixed (r, l'high, 0));
end function "/";
function "/" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed is
begin
return (to_sfixed (l, r'high, 0) / r);
end function "/";
function "rem" (
l : UNRESOLVED_ufixed; -- fixed point input
r : NATURAL)
return UNRESOLVED_ufixed is
begin
return (l rem to_ufixed (r, l'high, 0));
end function "rem";
function "rem" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return (to_ufixed (l, r'high, 0) rem r);
end function "rem";
function "rem" (
l : UNRESOLVED_sfixed; -- fixed point input
r : INTEGER)
return UNRESOLVED_sfixed is
begin
return (l rem to_sfixed (r, l'high, 0));
end function "rem";
function "rem" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed is
begin
return (to_sfixed (l, r'high, 0) rem r);
end function "rem";
function "mod" (
l : UNRESOLVED_ufixed; -- fixed point input
r : NATURAL)
return UNRESOLVED_ufixed is
begin
return (l mod to_ufixed (r, l'high, 0));
end function "mod";
function "mod" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return (to_ufixed (l, r'high, 0) mod r);
end function "mod";
function "mod" (
l : UNRESOLVED_sfixed; -- fixed point input
r : INTEGER)
return UNRESOLVED_sfixed is
begin
return (l mod to_sfixed (r, l'high, 0));
end function "mod";
function "mod" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed is
begin
return (to_sfixed (l, r'high, 0) mod r);
end function "mod";
-- overloaded ufixed compare functions with integer
function "=" (
l : UNRESOLVED_ufixed;
r : NATURAL) -- fixed point input
return BOOLEAN is
begin
return (l = to_ufixed (r, l'high, l'low));
end function "=";
function "/=" (
l : UNRESOLVED_ufixed;
r : NATURAL) -- fixed point input
return BOOLEAN is
begin
return (l /= to_ufixed (r, l'high, l'low));
end function "/=";
function ">=" (
l : UNRESOLVED_ufixed;
r : NATURAL) -- fixed point input
return BOOLEAN is
begin
return (l >= to_ufixed (r, l'high, l'low));
end function ">=";
function "<=" (
l : UNRESOLVED_ufixed;
r : NATURAL) -- fixed point input
return BOOLEAN is
begin
return (l <= to_ufixed (r, l'high, l'low));
end function "<=";
function ">" (
l : UNRESOLVED_ufixed;
r : NATURAL) -- fixed point input
return BOOLEAN is
begin
return (l > to_ufixed (r, l'high, l'low));
end function ">";
function "<" (
l : UNRESOLVED_ufixed;
r : NATURAL) -- fixed point input
return BOOLEAN is
begin
return (l < to_ufixed (r, l'high, l'low));
end function "<";
function "?=" (
l : UNRESOLVED_ufixed;
r : NATURAL) -- fixed point input
return STD_ULOGIC is
begin
return (l ?= to_ufixed (r, l'high, l'low));
end function "?=";
function "?/=" (
l : UNRESOLVED_ufixed;
r : NATURAL) -- fixed point input
return STD_ULOGIC is
begin
return (l ?/= to_ufixed (r, l'high, l'low));
end function "?/=";
function "?>=" (
l : UNRESOLVED_ufixed;
r : NATURAL) -- fixed point input
return STD_ULOGIC is
begin
return (l ?>= to_ufixed (r, l'high, l'low));
end function "?>=";
function "?<=" (
l : UNRESOLVED_ufixed;
r : NATURAL) -- fixed point input
return STD_ULOGIC is
begin
return (l ?<= to_ufixed (r, l'high, l'low));
end function "?<=";
function "?>" (
l : UNRESOLVED_ufixed;
r : NATURAL) -- fixed point input
return STD_ULOGIC is
begin
return (l ?> to_ufixed (r, l'high, l'low));
end function "?>";
function "?<" (
l : UNRESOLVED_ufixed;
r : NATURAL) -- fixed point input
return STD_ULOGIC is
begin
return (l ?< to_ufixed (r, l'high, l'low));
end function "?<";
function maximum (
l : UNRESOLVED_ufixed; -- fixed point input
r : NATURAL)
return UNRESOLVED_ufixed is
begin
return maximum (l, to_ufixed (r, l'high, l'low));
end function maximum;
function minimum (
l : UNRESOLVED_ufixed; -- fixed point input
r : NATURAL)
return UNRESOLVED_ufixed is
begin
return minimum (l, to_ufixed (r, l'high, l'low));
end function minimum;
-- NATURAL to ufixed
function "=" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN is
begin
return (to_ufixed (l, r'high, r'low) = r);
end function "=";
function "/=" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN is
begin
return (to_ufixed (l, r'high, r'low) /= r);
end function "/=";
function ">=" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN is
begin
return (to_ufixed (l, r'high, r'low) >= r);
end function ">=";
function "<=" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN is
begin
return (to_ufixed (l, r'high, r'low) <= r);
end function "<=";
function ">" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN is
begin
return (to_ufixed (l, r'high, r'low) > r);
end function ">";
function "<" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN is
begin
return (to_ufixed (l, r'high, r'low) < r);
end function "<";
function "?=" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_ufixed (l, r'high, r'low) ?= r);
end function "?=";
function "?/=" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_ufixed (l, r'high, r'low) ?/= r);
end function "?/=";
function "?>=" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_ufixed (l, r'high, r'low) ?>= r);
end function "?>=";
function "?<=" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_ufixed (l, r'high, r'low) ?<= r);
end function "?<=";
function "?>" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_ufixed (l, r'high, r'low) ?> r);
end function "?>";
function "?<" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_ufixed (l, r'high, r'low) ?< r);
end function "?<";
function maximum (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return maximum (to_ufixed (l, r'high, r'low), r);
end function maximum;
function minimum (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return minimum (to_ufixed (l, r'high, r'low), r);
end function minimum;
-- overloaded ufixed compare functions with real
function "=" (
l : UNRESOLVED_ufixed;
r : REAL)
return BOOLEAN is
begin
return (l = to_ufixed (r, l'high, l'low));
end function "=";
function "/=" (
l : UNRESOLVED_ufixed;
r : REAL)
return BOOLEAN is
begin
return (l /= to_ufixed (r, l'high, l'low));
end function "/=";
function ">=" (
l : UNRESOLVED_ufixed;
r : REAL)
return BOOLEAN is
begin
return (l >= to_ufixed (r, l'high, l'low));
end function ">=";
function "<=" (
l : UNRESOLVED_ufixed;
r : REAL)
return BOOLEAN is
begin
return (l <= to_ufixed (r, l'high, l'low));
end function "<=";
function ">" (
l : UNRESOLVED_ufixed;
r : REAL)
return BOOLEAN is
begin
return (l > to_ufixed (r, l'high, l'low));
end function ">";
function "<" (
l : UNRESOLVED_ufixed;
r : REAL)
return BOOLEAN is
begin
return (l < to_ufixed (r, l'high, l'low));
end function "<";
function "?=" (
l : UNRESOLVED_ufixed;
r : REAL)
return STD_ULOGIC is
begin
return (l ?= to_ufixed (r, l'high, l'low));
end function "?=";
function "?/=" (
l : UNRESOLVED_ufixed;
r : REAL)
return STD_ULOGIC is
begin
return (l ?/= to_ufixed (r, l'high, l'low));
end function "?/=";
function "?>=" (
l : UNRESOLVED_ufixed;
r : REAL)
return STD_ULOGIC is
begin
return (l ?>= to_ufixed (r, l'high, l'low));
end function "?>=";
function "?<=" (
l : UNRESOLVED_ufixed;
r : REAL)
return STD_ULOGIC is
begin
return (l ?<= to_ufixed (r, l'high, l'low));
end function "?<=";
function "?>" (
l : UNRESOLVED_ufixed;
r : REAL)
return STD_ULOGIC is
begin
return (l ?> to_ufixed (r, l'high, l'low));
end function "?>";
function "?<" (
l : UNRESOLVED_ufixed;
r : REAL)
return STD_ULOGIC is
begin
return (l ?< to_ufixed (r, l'high, l'low));
end function "?<";
function maximum (
l : UNRESOLVED_ufixed;
r : REAL)
return UNRESOLVED_ufixed is
begin
return maximum (l, to_ufixed (r, l'high, l'low));
end function maximum;
function minimum (
l : UNRESOLVED_ufixed;
r : REAL)
return UNRESOLVED_ufixed is
begin
return minimum (l, to_ufixed (r, l'high, l'low));
end function minimum;
-- real and ufixed
function "=" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN is
begin
return (to_ufixed (l, r'high, r'low) = r);
end function "=";
function "/=" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN is
begin
return (to_ufixed (l, r'high, r'low) /= r);
end function "/=";
function ">=" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN is
begin
return (to_ufixed (l, r'high, r'low) >= r);
end function ">=";
function "<=" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN is
begin
return (to_ufixed (l, r'high, r'low) <= r);
end function "<=";
function ">" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN is
begin
return (to_ufixed (l, r'high, r'low) > r);
end function ">";
function "<" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN is
begin
return (to_ufixed (l, r'high, r'low) < r);
end function "<";
function "?=" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_ufixed (l, r'high, r'low) ?= r);
end function "?=";
function "?/=" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_ufixed (l, r'high, r'low) ?/= r);
end function "?/=";
function "?>=" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_ufixed (l, r'high, r'low) ?>= r);
end function "?>=";
function "?<=" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_ufixed (l, r'high, r'low) ?<= r);
end function "?<=";
function "?>" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_ufixed (l, r'high, r'low) ?> r);
end function "?>";
function "?<" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_ufixed (l, r'high, r'low) ?< r);
end function "?<";
function maximum (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return maximum (to_ufixed (l, r'high, r'low), r);
end function maximum;
function minimum (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return minimum (to_ufixed (l, r'high, r'low), r);
end function minimum;
-- overloaded sfixed compare functions with integer
function "=" (
l : UNRESOLVED_sfixed;
r : INTEGER)
return BOOLEAN is
begin
return (l = to_sfixed (r, l'high, l'low));
end function "=";
function "/=" (
l : UNRESOLVED_sfixed;
r : INTEGER)
return BOOLEAN is
begin
return (l /= to_sfixed (r, l'high, l'low));
end function "/=";
function ">=" (
l : UNRESOLVED_sfixed;
r : INTEGER)
return BOOLEAN is
begin
return (l >= to_sfixed (r, l'high, l'low));
end function ">=";
function "<=" (
l : UNRESOLVED_sfixed;
r : INTEGER)
return BOOLEAN is
begin
return (l <= to_sfixed (r, l'high, l'low));
end function "<=";
function ">" (
l : UNRESOLVED_sfixed;
r : INTEGER)
return BOOLEAN is
begin
return (l > to_sfixed (r, l'high, l'low));
end function ">";
function "<" (
l : UNRESOLVED_sfixed;
r : INTEGER)
return BOOLEAN is
begin
return (l < to_sfixed (r, l'high, l'low));
end function "<";
function "?=" (
l : UNRESOLVED_sfixed;
r : INTEGER)
return STD_ULOGIC is
begin
return (l ?= to_sfixed (r, l'high, l'low));
end function "?=";
function "?/=" (
l : UNRESOLVED_sfixed;
r : INTEGER)
return STD_ULOGIC is
begin
return (l ?/= to_sfixed (r, l'high, l'low));
end function "?/=";
function "?>=" (
l : UNRESOLVED_sfixed;
r : INTEGER)
return STD_ULOGIC is
begin
return (l ?>= to_sfixed (r, l'high, l'low));
end function "?>=";
function "?<=" (
l : UNRESOLVED_sfixed;
r : INTEGER)
return STD_ULOGIC is
begin
return (l ?<= to_sfixed (r, l'high, l'low));
end function "?<=";
function "?>" (
l : UNRESOLVED_sfixed;
r : INTEGER)
return STD_ULOGIC is
begin
return (l ?> to_sfixed (r, l'high, l'low));
end function "?>";
function "?<" (
l : UNRESOLVED_sfixed;
r : INTEGER)
return STD_ULOGIC is
begin
return (l ?< to_sfixed (r, l'high, l'low));
end function "?<";
function maximum (
l : UNRESOLVED_sfixed;
r : INTEGER)
return UNRESOLVED_sfixed is
begin
return maximum (l, to_sfixed (r, l'high, l'low));
end function maximum;
function minimum (
l : UNRESOLVED_sfixed;
r : INTEGER)
return UNRESOLVED_sfixed is
begin
return minimum (l, to_sfixed (r, l'high, l'low));
end function minimum;
-- integer and sfixed
function "=" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN is
begin
return (to_sfixed (l, r'high, r'low) = r);
end function "=";
function "/=" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN is
begin
return (to_sfixed (l, r'high, r'low) /= r);
end function "/=";
function ">=" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN is
begin
return (to_sfixed (l, r'high, r'low) >= r);
end function ">=";
function "<=" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN is
begin
return (to_sfixed (l, r'high, r'low) <= r);
end function "<=";
function ">" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN is
begin
return (to_sfixed (l, r'high, r'low) > r);
end function ">";
function "<" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN is
begin
return (to_sfixed (l, r'high, r'low) < r);
end function "<";
function "?=" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_sfixed (l, r'high, r'low) ?= r);
end function "?=";
function "?/=" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_sfixed (l, r'high, r'low) ?/= r);
end function "?/=";
function "?>=" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_sfixed (l, r'high, r'low) ?>= r);
end function "?>=";
function "?<=" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_sfixed (l, r'high, r'low) ?<= r);
end function "?<=";
function "?>" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_sfixed (l, r'high, r'low) ?> r);
end function "?>";
function "?<" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_sfixed (l, r'high, r'low) ?< r);
end function "?<";
function maximum (
l : INTEGER;
r : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed is
begin
return maximum (to_sfixed (l, r'high, r'low), r);
end function maximum;
function minimum (
l : INTEGER;
r : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed is
begin
return minimum (to_sfixed (l, r'high, r'low), r);
end function minimum;
-- overloaded sfixed compare functions with real
function "=" (
l : UNRESOLVED_sfixed;
r : REAL)
return BOOLEAN is
begin
return (l = to_sfixed (r, l'high, l'low));
end function "=";
function "/=" (
l : UNRESOLVED_sfixed;
r : REAL)
return BOOLEAN is
begin
return (l /= to_sfixed (r, l'high, l'low));
end function "/=";
function ">=" (
l : UNRESOLVED_sfixed;
r : REAL)
return BOOLEAN is
begin
return (l >= to_sfixed (r, l'high, l'low));
end function ">=";
function "<=" (
l : UNRESOLVED_sfixed;
r : REAL)
return BOOLEAN is
begin
return (l <= to_sfixed (r, l'high, l'low));
end function "<=";
function ">" (
l : UNRESOLVED_sfixed;
r : REAL)
return BOOLEAN is
begin
return (l > to_sfixed (r, l'high, l'low));
end function ">";
function "<" (
l : UNRESOLVED_sfixed;
r : REAL)
return BOOLEAN is
begin
return (l < to_sfixed (r, l'high, l'low));
end function "<";
function "?=" (
l : UNRESOLVED_sfixed;
r : REAL)
return STD_ULOGIC is
begin
return (l ?= to_sfixed (r, l'high, l'low));
end function "?=";
function "?/=" (
l : UNRESOLVED_sfixed;
r : REAL)
return STD_ULOGIC is
begin
return (l ?/= to_sfixed (r, l'high, l'low));
end function "?/=";
function "?>=" (
l : UNRESOLVED_sfixed;
r : REAL)
return STD_ULOGIC is
begin
return (l ?>= to_sfixed (r, l'high, l'low));
end function "?>=";
function "?<=" (
l : UNRESOLVED_sfixed;
r : REAL)
return STD_ULOGIC is
begin
return (l ?<= to_sfixed (r, l'high, l'low));
end function "?<=";
function "?>" (
l : UNRESOLVED_sfixed;
r : REAL)
return STD_ULOGIC is
begin
return (l ?> to_sfixed (r, l'high, l'low));
end function "?>";
function "?<" (
l : UNRESOLVED_sfixed;
r : REAL)
return STD_ULOGIC is
begin
return (l ?< to_sfixed (r, l'high, l'low));
end function "?<";
function maximum (
l : UNRESOLVED_sfixed;
r : REAL)
return UNRESOLVED_sfixed is
begin
return maximum (l, to_sfixed (r, l'high, l'low));
end function maximum;
function minimum (
l : UNRESOLVED_sfixed;
r : REAL)
return UNRESOLVED_sfixed is
begin
return minimum (l, to_sfixed (r, l'high, l'low));
end function minimum;
-- REAL and sfixed
function "=" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN is
begin
return (to_sfixed (l, r'high, r'low) = r);
end function "=";
function "/=" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN is
begin
return (to_sfixed (l, r'high, r'low) /= r);
end function "/=";
function ">=" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN is
begin
return (to_sfixed (l, r'high, r'low) >= r);
end function ">=";
function "<=" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN is
begin
return (to_sfixed (l, r'high, r'low) <= r);
end function "<=";
function ">" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN is
begin
return (to_sfixed (l, r'high, r'low) > r);
end function ">";
function "<" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN is
begin
return (to_sfixed (l, r'high, r'low) < r);
end function "<";
function "?=" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_sfixed (l, r'high, r'low) ?= r);
end function "?=";
function "?/=" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_sfixed (l, r'high, r'low) ?/= r);
end function "?/=";
function "?>=" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_sfixed (l, r'high, r'low) ?>= r);
end function "?>=";
function "?<=" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_sfixed (l, r'high, r'low) ?<= r);
end function "?<=";
function "?>" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_sfixed (l, r'high, r'low) ?> r);
end function "?>";
function "?<" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_sfixed (l, r'high, r'low) ?< r);
end function "?<";
function maximum (
l : REAL;
r : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed is
begin
return maximum (to_sfixed (l, r'high, r'low), r);
end function maximum;
function minimum (
l : REAL;
r : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed is
begin
return minimum (to_sfixed (l, r'high, r'low), r);
end function minimum;
-- copied from std_logic_textio
type MVL9plus is ('U', 'X', '0', '1', 'Z', 'W', 'L', 'H', '-', error);
type char_indexed_by_MVL9 is array (STD_ULOGIC) of CHARACTER;
type MVL9_indexed_by_char is array (CHARACTER) of STD_ULOGIC;
type MVL9plus_indexed_by_char is array (CHARACTER) of MVL9plus;
constant MVL9_to_char : char_indexed_by_MVL9 := "UX01ZWLH-";
constant char_to_MVL9 : MVL9_indexed_by_char :=
('U' => 'U', 'X' => 'X', '0' => '0', '1' => '1', 'Z' => 'Z',
'W' => 'W', 'L' => 'L', 'H' => 'H', '-' => '-', others => 'U');
constant char_to_MVL9plus : MVL9plus_indexed_by_char :=
('U' => 'U', 'X' => 'X', '0' => '0', '1' => '1', 'Z' => 'Z',
'W' => 'W', 'L' => 'L', 'H' => 'H', '-' => '-', others => error);
constant NBSP : CHARACTER := CHARACTER'val(160); -- space character
constant NUS : STRING(2 to 1) := (others => ' ');
-- purpose: Skips white space
procedure skip_whitespace (
L : inout LINE) is
variable readOk : BOOLEAN;
variable c : CHARACTER;
begin
while L /= null and L.all'length /= 0 loop
c := l (l'left);
if (c = ' ' or c = NBSP or c = HT) then
read (l, c, readOk);
else
exit;
end if;
end loop;
end procedure skip_whitespace;
-- purpose: writes fixed point into a line
procedure write (
L : inout LINE; -- input line
VALUE : in UNRESOLVED_ufixed; -- fixed point input
JUSTIFIED : in SIDE := right;
FIELD : in WIDTH := 0) is
variable s : STRING(1 to value'length +1) := (others => ' ');
variable sindx : INTEGER;
begin -- function write Example: 0011.1100
sindx := 1;
for i in value'high downto value'low loop
if i = -1 then
s(sindx) := '.';
sindx := sindx + 1;
end if;
s(sindx) := MVL9_to_char(STD_ULOGIC(value(i)));
sindx := sindx + 1;
end loop;
write(l, s, justified, field);
end procedure write;
-- purpose: writes fixed point into a line
procedure write (
L : inout LINE; -- input line
VALUE : in UNRESOLVED_sfixed; -- fixed point input
JUSTIFIED : in SIDE := right;
FIELD : in WIDTH := 0) is
variable s : STRING(1 to value'length +1);
variable sindx : INTEGER;
begin -- function write Example: 0011.1100
sindx := 1;
for i in value'high downto value'low loop
if i = -1 then
s(sindx) := '.';
sindx := sindx + 1;
end if;
s(sindx) := MVL9_to_char(STD_ULOGIC(value(i)));
sindx := sindx + 1;
end loop;
write(l, s, justified, field);
end procedure write;
procedure READ(L : inout LINE;
VALUE : out UNRESOLVED_ufixed) is
-- Possible data: 00000.0000000
-- 000000000000
variable c : CHARACTER;
variable readOk : BOOLEAN;
variable i : INTEGER; -- index variable
variable mv : ufixed (VALUE'range);
variable lastu : BOOLEAN := false; -- last character was an "_"
variable founddot : BOOLEAN := false; -- found a "."
begin -- READ
VALUE := (VALUE'range => 'U');
Skip_whitespace (L);
if VALUE'length > 0 then -- non Null input string
read (l, c, readOk);
i := value'high;
while i >= VALUE'low loop
if readOk = false then -- Bail out if there was a bad read
report fixed_generic_pkg'instance_name & "READ(ufixed) "
& "End of string encountered"
severity error;
return;
elsif c = '_' then
if i = value'high then
report fixed_generic_pkg'instance_name & "READ(ufixed) "
& "String begins with an ""_""" severity error;
return;
elsif lastu then
report fixed_generic_pkg'instance_name & "READ(ufixed) "
& "Two underscores detected in input string ""__"""
severity error;
return;
else
lastu := true;
end if;
elsif c = '.' then -- binary point
if founddot then
report fixed_generic_pkg'instance_name & "READ(ufixed) "
& "Two binary points found in input string" severity error;
return;
elsif i /= -1 then -- Seperator in the wrong spot
report fixed_generic_pkg'instance_name & "READ(ufixed) "
& "Decimal point does not match number format "
severity error;
return;
end if;
founddot := true;
lastu := false;
elsif c = ' ' or c = NBSP or c = HT then -- reading done.
report fixed_generic_pkg'instance_name & "READ(ufixed) "
& "Short read, Space encounted in input string"
severity error;
return;
elsif char_to_MVL9plus(c) = error then
report fixed_generic_pkg'instance_name & "READ(ufixed) "
& "Character '" &
c & "' read, expected STD_ULOGIC literal."
severity error;
return;
else
mv(i) := char_to_MVL9(c);
i := i - 1;
if i < mv'low then
VALUE := mv;
return;
end if;
lastu := false;
end if;
read(L, c, readOk);
end loop;
end if;
end procedure READ;
procedure READ(L : inout LINE;
VALUE : out UNRESOLVED_ufixed;
GOOD : out BOOLEAN) is
-- Possible data: 00000.0000000
-- 000000000000
variable c : CHARACTER;
variable readOk : BOOLEAN;
variable mv : ufixed (VALUE'range);
variable i : INTEGER; -- index variable
variable lastu : BOOLEAN := false; -- last character was an "_"
variable founddot : BOOLEAN := false; -- found a "."
begin -- READ
VALUE := (VALUE'range => 'U');
Skip_whitespace (L);
if VALUE'length > 0 then
read (l, c, readOk);
i := value'high;
GOOD := false;
while i >= VALUE'low loop
if not readOk then -- Bail out if there was a bad read
return;
elsif c = '_' then
if i = value'high then -- Begins with an "_"
return;
elsif lastu then -- "__" detected
return;
else
lastu := true;
end if;
elsif c = '.' then -- binary point
if founddot then
return;
elsif i /= -1 then -- Seperator in the wrong spot
return;
end if;
founddot := true;
lastu := false;
elsif (char_to_MVL9plus(c) = error) then -- Illegal character/short read
return;
else
mv(i) := char_to_MVL9(c);
i := i - 1;
if i < mv'low then -- reading done
GOOD := true;
VALUE := mv;
return;
end if;
lastu := false;
end if;
read(L, c, readOk);
end loop;
else
GOOD := true; -- read into a null array
end if;
end procedure READ;
procedure READ(L : inout LINE;
VALUE : out UNRESOLVED_sfixed) is
variable c : CHARACTER;
variable readOk : BOOLEAN;
variable i : INTEGER; -- index variable
variable mv : sfixed (VALUE'range);
variable lastu : BOOLEAN := false; -- last character was an "_"
variable founddot : BOOLEAN := false; -- found a "."
begin -- READ
VALUE := (VALUE'range => 'U');
Skip_whitespace (L);
if VALUE'length > 0 then -- non Null input string
read (l, c, readOk);
i := value'high;
while i >= VALUE'low loop
if readOk = false then -- Bail out if there was a bad read
report fixed_generic_pkg'instance_name & "READ(sfixed) "
& "End of string encountered"
severity error;
return;
elsif c = '_' then
if i = value'high then
report fixed_generic_pkg'instance_name & "READ(sfixed) "
& "String begins with an ""_""" severity error;
return;
elsif lastu then
report fixed_generic_pkg'instance_name & "READ(sfixed) "
& "Two underscores detected in input string ""__"""
severity error;
return;
else
lastu := true;
end if;
elsif c = '.' then -- binary point
if founddot then
report fixed_generic_pkg'instance_name & "READ(sfixed) "
& "Two binary points found in input string" severity error;
return;
elsif i /= -1 then -- Seperator in the wrong spot
report fixed_generic_pkg'instance_name & "READ(sfixed) "
& "Decimal point does not match number format "
severity error;
return;
end if;
founddot := true;
lastu := false;
elsif c = ' ' or c = NBSP or c = HT then -- reading done.
report fixed_generic_pkg'instance_name & "READ(sfixed) "
& "Short read, Space encounted in input string"
severity error;
return;
elsif char_to_MVL9plus(c) = error then
report fixed_generic_pkg'instance_name & "READ(sfixed) "
& "Character '" &
c & "' read, expected STD_ULOGIC literal."
severity error;
return;
else
mv(i) := char_to_MVL9(c);
i := i - 1;
if i < mv'low then
VALUE := mv;
return;
end if;
lastu := false;
end if;
read(L, c, readOk);
end loop;
end if;
end procedure READ;
procedure READ(L : inout LINE;
VALUE : out UNRESOLVED_sfixed;
GOOD : out BOOLEAN) is
variable value_ufixed : UNRESOLVED_ufixed (VALUE'range);
begin -- READ
READ (L => L, VALUE => value_ufixed, GOOD => GOOD);
VALUE := UNRESOLVED_sfixed (value_ufixed);
end procedure READ;
-- octal read and write
procedure owrite (
L : inout LINE; -- input line
VALUE : in UNRESOLVED_ufixed; -- fixed point input
JUSTIFIED : in SIDE := right;
FIELD : in WIDTH := 0) is
begin -- Example 03.30
write (L => L,
VALUE => to_ostring (VALUE),
JUSTIFIED => JUSTIFIED,
FIELD => FIELD);
end procedure owrite;
procedure owrite (
L : inout LINE; -- input line
VALUE : in UNRESOLVED_sfixed; -- fixed point input
JUSTIFIED : in SIDE := right;
FIELD : in WIDTH := 0) is
begin -- Example 03.30
write (L => L,
VALUE => to_ostring (VALUE),
JUSTIFIED => JUSTIFIED,
FIELD => FIELD);
end procedure owrite;
-- Note that for Octal and Hex read, you can not start with a ".",
-- the read is for numbers formatted "A.BC". These routines go to
-- the nearest bounds, so "F.E" will fit into an sfixed (2 downto -3).
procedure Char2TriBits (C : CHARACTER;
RESULT : out STD_ULOGIC_VECTOR(2 downto 0);
GOOD : out BOOLEAN;
ISSUE_ERROR : in BOOLEAN) is
begin
case c is
when '0' => result := o"0"; good := true;
when '1' => result := o"1"; good := true;
when '2' => result := o"2"; good := true;
when '3' => result := o"3"; good := true;
when '4' => result := o"4"; good := true;
when '5' => result := o"5"; good := true;
when '6' => result := o"6"; good := true;
when '7' => result := o"7"; good := true;
when 'Z' => result := "ZZZ"; good := true;
when 'X' => result := "XXX"; good := true;
when others =>
assert not ISSUE_ERROR
report fixed_generic_pkg'instance_name
& "OREAD Error: Read a '" & c &
"', expected an Octal character (0-7)."
severity error;
result := "UUU";
good := false;
end case;
end procedure Char2TriBits;
-- purpose: Routines common to the OREAD routines
procedure OREAD_common (
L : inout LINE;
slv : out STD_ULOGIC_VECTOR;
igood : out BOOLEAN;
idex : out INTEGER;
constant bpoint : in INTEGER; -- binary point
constant message : in BOOLEAN;
constant smath : in BOOLEAN) is
-- purpose: error message routine
procedure errmes (
constant mess : in STRING) is -- error message
begin
if message then
if smath then
report fixed_generic_pkg'instance_name
& "OREAD(sfixed) "
& mess
severity error;
else
report fixed_generic_pkg'instance_name
& "OREAD(ufixed) "
& mess
severity error;
end if;
end if;
end procedure errmes;
variable xgood : BOOLEAN;
variable nybble : STD_ULOGIC_VECTOR (2 downto 0); -- 3 bits
variable c : CHARACTER;
variable i : INTEGER;
variable lastu : BOOLEAN := false; -- last character was an "_"
variable founddot : BOOLEAN := false; -- found a dot.
begin
Skip_whitespace (L);
if slv'length > 0 then
i := slv'high;
read (l, c, xgood);
while i > 0 loop
if xgood = false then
errmes ("Error: end of string encountered");
exit;
elsif c = '_' then
if i = slv'length then
errmes ("Error: String begins with an ""_""");
xgood := false;
exit;
elsif lastu then
errmes ("Error: Two underscores detected in input string ""__""");
xgood := false;
exit;
else
lastu := true;
end if;
elsif (c = '.') then
if (i + 1 /= bpoint) then
errmes ("encountered ""."" at wrong index");
xgood := false;
exit;
elsif i = slv'length then
errmes ("encounted a ""."" at the beginning of the line");
xgood := false;
exit;
elsif founddot then
errmes ("Two ""."" encounted in input string");
xgood := false;
exit;
end if;
founddot := true;
lastu := false;
else
Char2triBits(c, nybble, xgood, message);
if not xgood then
exit;
end if;
slv (i downto i-2) := nybble;
i := i - 3;
lastu := false;
end if;
if i > 0 then
read (L, c, xgood);
end if;
end loop;
idex := i;
igood := xgood;
else
igood := true; -- read into a null array
idex := -1;
end if;
end procedure OREAD_common;
-- Note that for Octal and Hex read, you can not start with a ".",
-- the read is for numbers formatted "A.BC". These routines go to
-- the nearest bounds, so "F.E" will fit into an sfixed (2 downto -3).
procedure OREAD (L : inout LINE;
VALUE : out UNRESOLVED_ufixed) is
constant hbv : INTEGER := (((maximum(3, (VALUE'high+1))+2)/3)*3)-1;
constant lbv : INTEGER := ((mine(0, VALUE'low)-2)/3)*3;
variable slv : STD_ULOGIC_VECTOR (hbv-lbv downto 0); -- high bits
variable valuex : UNRESOLVED_ufixed (hbv downto lbv);
variable igood : BOOLEAN;
variable i : INTEGER;
begin
VALUE := (VALUE'range => 'U');
OREAD_common ( L => L,
slv => slv,
igood => igood,
idex => i,
bpoint => -lbv,
message => true,
smath => false);
if igood then -- We did not get another error
if not ((i = -1) and -- We read everything, and high bits 0
(or (slv(hbv-lbv downto VALUE'high+1-lbv)) = '0')) then
report fixed_generic_pkg'instance_name
& "OREAD(ufixed): Vector truncated."
severity error;
else
if (or (slv(VALUE'low-lbv-1 downto 0)) = '1') then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& "OREAD(ufixed): Vector truncated"
severity warning;
end if;
valuex := to_ufixed (slv, hbv, lbv);
VALUE := valuex (VALUE'range);
end if;
end if;
end procedure OREAD;
procedure OREAD(L : inout LINE;
VALUE : out UNRESOLVED_ufixed;
GOOD : out BOOLEAN) is
constant hbv : INTEGER := (((maximum(3, (VALUE'high+1))+2)/3)*3)-1;
constant lbv : INTEGER := ((mine(0, VALUE'low)-2)/3)*3;
variable slv : STD_ULOGIC_VECTOR (hbv-lbv downto 0); -- high bits
variable valuex : UNRESOLVED_ufixed (hbv downto lbv);
variable igood : BOOLEAN;
variable i : INTEGER;
begin
VALUE := (VALUE'range => 'U');
OREAD_common ( L => L,
slv => slv,
igood => igood,
idex => i,
bpoint => -lbv,
message => false,
smath => false);
if (igood and -- We did not get another error
(i = -1) and -- We read everything, and high bits 0
(or (slv(hbv-lbv downto VALUE'high+1-lbv)) = '0')) then
valuex := to_ufixed (slv, hbv, lbv);
VALUE := valuex (VALUE'range);
good := true;
else
good := false;
end if;
end procedure OREAD;
procedure OREAD(L : inout LINE;
VALUE : out UNRESOLVED_sfixed) is
constant hbv : INTEGER := (((maximum(3, (VALUE'high+1))+2)/3)*3)-1;
constant lbv : INTEGER := ((mine(0, VALUE'low)-2)/3)*3;
variable slv : STD_ULOGIC_VECTOR (hbv-lbv downto 0); -- high bits
variable valuex : UNRESOLVED_sfixed (hbv downto lbv);
variable igood : BOOLEAN;
variable i : INTEGER;
begin
VALUE := (VALUE'range => 'U');
OREAD_common ( L => L,
slv => slv,
igood => igood,
idex => i,
bpoint => -lbv,
message => true,
smath => true);
if igood then -- We did not get another error
if not ((i = -1) and -- We read everything
((slv(VALUE'high-lbv) = '0' and -- sign bits = extra bits
or (slv(hbv-lbv downto VALUE'high+1-lbv)) = '0') or
(slv(VALUE'high-lbv) = '1' and
and (slv(hbv-lbv downto VALUE'high+1-lbv)) = '1'))) then
report fixed_generic_pkg'instance_name
& "OREAD(sfixed): Vector truncated."
severity error;
else
if (or (slv(VALUE'low-lbv-1 downto 0)) = '1') then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& "OREAD(sfixed): Vector truncated"
severity warning;
end if;
valuex := to_sfixed (slv, hbv, lbv);
VALUE := valuex (VALUE'range);
end if;
end if;
end procedure OREAD;
procedure OREAD(L : inout LINE;
VALUE : out UNRESOLVED_sfixed;
GOOD : out BOOLEAN) is
constant hbv : INTEGER := (((maximum(3, (VALUE'high+1))+2)/3)*3)-1;
constant lbv : INTEGER := ((mine(0, VALUE'low)-2)/3)*3;
variable slv : STD_ULOGIC_VECTOR (hbv-lbv downto 0); -- high bits
variable valuex : UNRESOLVED_sfixed (hbv downto lbv);
variable igood : BOOLEAN;
variable i : INTEGER;
begin
VALUE := (VALUE'range => 'U');
OREAD_common ( L => L,
slv => slv,
igood => igood,
idex => i,
bpoint => -lbv,
message => false,
smath => true);
if (igood -- We did not get another error
and (i = -1) -- We read everything
and ((slv(VALUE'high-lbv) = '0' and -- sign bits = extra bits
or (slv(hbv-lbv downto VALUE'high+1-lbv)) = '0') or
(slv(VALUE'high-lbv) = '1' and
and (slv(hbv-lbv downto VALUE'high+1-lbv)) = '1'))) then
valuex := to_sfixed (slv, hbv, lbv);
VALUE := valuex (VALUE'range);
good := true;
else
good := false;
end if;
end procedure OREAD;
-- hex read and write
procedure hwrite (
L : inout LINE; -- input line
VALUE : in UNRESOLVED_ufixed; -- fixed point input
JUSTIFIED : in SIDE := right;
FIELD : in WIDTH := 0) is
begin -- Example 03.30
write (L => L,
VALUE => to_hstring (VALUE),
JUSTIFIED => JUSTIFIED,
FIELD => FIELD);
end procedure hwrite;
-- purpose: writes fixed point into a line
procedure hwrite (
L : inout LINE; -- input line
VALUE : in UNRESOLVED_sfixed; -- fixed point input
JUSTIFIED : in SIDE := right;
FIELD : in WIDTH := 0) is
begin -- Example 03.30
write (L => L,
VALUE => to_hstring (VALUE),
JUSTIFIED => JUSTIFIED,
FIELD => FIELD);
end procedure hwrite;
-- Hex Read and Write procedures for STD_ULOGIC_VECTOR.
-- Modified from the original to be more forgiving.
procedure Char2QuadBits (C : CHARACTER;
RESULT : out STD_ULOGIC_VECTOR(3 downto 0);
GOOD : out BOOLEAN;
ISSUE_ERROR : in BOOLEAN) is
begin
case c is
when '0' => result := x"0"; good := true;
when '1' => result := x"1"; good := true;
when '2' => result := x"2"; good := true;
when '3' => result := x"3"; good := true;
when '4' => result := x"4"; good := true;
when '5' => result := x"5"; good := true;
when '6' => result := x"6"; good := true;
when '7' => result := x"7"; good := true;
when '8' => result := x"8"; good := true;
when '9' => result := x"9"; good := true;
when 'A' | 'a' => result := x"A"; good := true;
when 'B' | 'b' => result := x"B"; good := true;
when 'C' | 'c' => result := x"C"; good := true;
when 'D' | 'd' => result := x"D"; good := true;
when 'E' | 'e' => result := x"E"; good := true;
when 'F' | 'f' => result := x"F"; good := true;
when 'Z' => result := "ZZZZ"; good := true;
when 'X' => result := "XXXX"; good := true;
when others =>
assert not ISSUE_ERROR
report fixed_generic_pkg'instance_name
& "HREAD Error: Read a '" & c &
"', expected a Hex character (0-F)."
severity error;
result := "UUUU";
good := false;
end case;
end procedure Char2QuadBits;
-- purpose: Routines common to the HREAD routines
procedure HREAD_common (
L : inout LINE;
slv : out STD_ULOGIC_VECTOR;
igood : out BOOLEAN;
idex : out INTEGER;
constant bpoint : in INTEGER; -- binary point
constant message : in BOOLEAN;
constant smath : in BOOLEAN) is
-- purpose: error message routine
procedure errmes (
constant mess : in STRING) is -- error message
begin
if message then
if smath then
report fixed_generic_pkg'instance_name
& "HREAD(sfixed) "
& mess
severity error;
else
report fixed_generic_pkg'instance_name
& "HREAD(ufixed) "
& mess
severity error;
end if;
end if;
end procedure errmes;
variable xgood : BOOLEAN;
variable nybble : STD_ULOGIC_VECTOR (3 downto 0); -- 4 bits
variable c : CHARACTER;
variable i : INTEGER;
variable lastu : BOOLEAN := false; -- last character was an "_"
variable founddot : BOOLEAN := false; -- found a dot.
begin
Skip_whitespace (L);
if slv'length > 0 then
i := slv'high;
read (l, c, xgood);
while i > 0 loop
if xgood = false then
errmes ("Error: end of string encountered");
exit;
elsif c = '_' then
if i = slv'length then
errmes ("Error: String begins with an ""_""");
xgood := false;
exit;
elsif lastu then
errmes ("Error: Two underscores detected in input string ""__""");
xgood := false;
exit;
else
lastu := true;
end if;
elsif (c = '.') then
if (i + 1 /= bpoint) then
errmes ("encountered ""."" at wrong index");
xgood := false;
exit;
elsif i = slv'length then
errmes ("encounted a ""."" at the beginning of the line");
xgood := false;
exit;
elsif founddot then
errmes ("Two ""."" encounted in input string");
xgood := false;
exit;
end if;
founddot := true;
lastu := false;
else
Char2QuadBits(c, nybble, xgood, message);
if not xgood then
exit;
end if;
slv (i downto i-3) := nybble;
i := i - 4;
lastu := false;
end if;
if i > 0 then
read (L, c, xgood);
end if;
end loop;
idex := i;
igood := xgood;
else
idex := -1;
igood := true; -- read null string
end if;
end procedure HREAD_common;
procedure HREAD(L : inout LINE;
VALUE : out UNRESOLVED_ufixed) is
constant hbv : INTEGER := (((maximum(4, (VALUE'high+1))+3)/4)*4)-1;
constant lbv : INTEGER := ((mine(0, VALUE'low)-3)/4)*4;
variable slv : STD_ULOGIC_VECTOR (hbv-lbv downto 0); -- high bits
variable valuex : UNRESOLVED_ufixed (hbv downto lbv);
variable igood : BOOLEAN;
variable i : INTEGER;
begin
VALUE := (VALUE'range => 'U');
HREAD_common ( L => L,
slv => slv,
igood => igood,
idex => i,
bpoint => -lbv,
message => false,
smath => false);
if igood then
if not ((i = -1) and -- We read everything, and high bits 0
(or (slv(hbv-lbv downto VALUE'high+1-lbv)) = '0')) then
report fixed_generic_pkg'instance_name
& "HREAD(ufixed): Vector truncated."
severity error;
else
if (or (slv(VALUE'low-lbv-1 downto 0)) = '1') then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& "HREAD(ufixed): Vector truncated"
severity warning;
end if;
valuex := to_ufixed (slv, hbv, lbv);
VALUE := valuex (VALUE'range);
end if;
end if;
end procedure HREAD;
procedure HREAD(L : inout LINE;
VALUE : out UNRESOLVED_ufixed;
GOOD : out BOOLEAN) is
constant hbv : INTEGER := (((maximum(4, (VALUE'high+1))+3)/4)*4)-1;
constant lbv : INTEGER := ((mine(0, VALUE'low)-3)/4)*4;
variable slv : STD_ULOGIC_VECTOR (hbv-lbv downto 0); -- high bits
variable valuex : UNRESOLVED_ufixed (hbv downto lbv);
variable igood : BOOLEAN;
variable i : INTEGER;
begin
VALUE := (VALUE'range => 'U');
HREAD_common ( L => L,
slv => slv,
igood => igood,
idex => i,
bpoint => -lbv,
message => false,
smath => false);
if (igood and -- We did not get another error
(i = -1) and -- We read everything, and high bits 0
(or (slv(hbv-lbv downto VALUE'high+1-lbv)) = '0')) then
valuex := to_ufixed (slv, hbv, lbv);
VALUE := valuex (VALUE'range);
good := true;
else
good := false;
end if;
end procedure HREAD;
procedure HREAD(L : inout LINE;
VALUE : out UNRESOLVED_sfixed) is
constant hbv : INTEGER := (((maximum(4, (VALUE'high+1))+3)/4)*4)-1;
constant lbv : INTEGER := ((mine(0, VALUE'low)-3)/4)*4;
variable slv : STD_ULOGIC_VECTOR (hbv-lbv downto 0); -- high bits
variable valuex : UNRESOLVED_sfixed (hbv downto lbv);
variable igood : BOOLEAN;
variable i : INTEGER;
begin
VALUE := (VALUE'range => 'U');
HREAD_common ( L => L,
slv => slv,
igood => igood,
idex => i,
bpoint => -lbv,
message => true,
smath => true);
if igood then -- We did not get another error
if not ((i = -1) -- We read everything
and ((slv(VALUE'high-lbv) = '0' and -- sign bits = extra bits
or (slv(hbv-lbv downto VALUE'high+1-lbv)) = '0') or
(slv(VALUE'high-lbv) = '1' and
and (slv(hbv-lbv downto VALUE'high+1-lbv)) = '1'))) then
report fixed_generic_pkg'instance_name
& "HREAD(sfixed): Vector truncated."
severity error;
else
if (or (slv(VALUE'low-lbv-1 downto 0)) = '1') then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& "HREAD(sfixed): Vector truncated"
severity warning;
end if;
valuex := to_sfixed (slv, hbv, lbv);
VALUE := valuex (VALUE'range);
end if;
end if;
end procedure HREAD;
procedure HREAD(L : inout LINE;
VALUE : out UNRESOLVED_sfixed;
GOOD : out BOOLEAN) is
constant hbv : INTEGER := (((maximum(4, (VALUE'high+1))+3)/4)*4)-1;
constant lbv : INTEGER := ((mine(0, VALUE'low)-3)/4)*4;
variable slv : STD_ULOGIC_VECTOR (hbv-lbv downto 0); -- high bits
variable valuex : UNRESOLVED_sfixed (hbv downto lbv);
variable igood : BOOLEAN;
variable i : INTEGER;
begin
VALUE := (VALUE'range => 'U');
HREAD_common ( L => L,
slv => slv,
igood => igood,
idex => i,
bpoint => -lbv,
message => false,
smath => true);
if (igood and -- We did not get another error
(i = -1) and -- We read everything
((slv(VALUE'high-lbv) = '0' and -- sign bits = extra bits
or (slv(hbv-lbv downto VALUE'high+1-lbv)) = '0') or
(slv(VALUE'high-lbv) = '1' and
and (slv(hbv-lbv downto VALUE'high+1-lbv)) = '1'))) then
valuex := to_sfixed (slv, hbv, lbv);
VALUE := valuex (VALUE'range);
good := true;
else
good := false;
end if;
end procedure HREAD;
-- To_string functions. Useful in "report" statements.
-- Example: report "result was " & to_string(result);
function to_string (value : UNRESOLVED_ufixed) return STRING is
variable s : STRING(1 to value'length +1) := (others => ' ');
variable subval : UNRESOLVED_ufixed (value'high downto -1);
variable sindx : INTEGER;
begin
if value'length < 1 then
return NUS;
else
if value'high < 0 then
if value(value'high) = 'Z' then
return to_string (resize (sfixed(value), 0, value'low));
else
return to_string (resize (value, 0, value'low));
end if;
elsif value'low >= 0 then
if Is_X (value(value'low)) then
subval := (others => value(value'low));
subval (value'range) := value;
return to_string(subval);
else
return to_string (resize (value, value'high, -1));
end if;
else
sindx := 1;
for i in value'high downto value'low loop
if i = -1 then
s(sindx) := '.';
sindx := sindx + 1;
end if;
s(sindx) := MVL9_to_char(STD_ULOGIC(value(i)));
sindx := sindx + 1;
end loop;
return s;
end if;
end if;
end function to_string;
function to_string (value : UNRESOLVED_sfixed) return STRING is
variable s : STRING(1 to value'length + 1) := (others => ' ');
variable subval : UNRESOLVED_sfixed (value'high downto -1);
variable sindx : INTEGER;
begin
if value'length < 1 then
return NUS;
else
if value'high < 0 then
return to_string (resize (value, 0, value'low));
elsif value'low >= 0 then
if Is_X (value(value'low)) then
subval := (others => value(value'low));
subval (value'range) := value;
return to_string(subval);
else
return to_string (resize (value, value'high, -1));
end if;
else
sindx := 1;
for i in value'high downto value'low loop
if i = -1 then
s(sindx) := '.';
sindx := sindx + 1;
end if;
s(sindx) := MVL9_to_char(STD_ULOGIC(value(i)));
sindx := sindx + 1;
end loop;
return s;
end if;
end if;
end function to_string;
function to_ostring (value : UNRESOLVED_ufixed) return STRING is
constant lne : INTEGER := (-VALUE'low+2)/3;
variable subval : UNRESOLVED_ufixed (value'high downto -3);
variable lpad : STD_ULOGIC_VECTOR (0 to (lne*3 + VALUE'low) -1);
variable slv : STD_ULOGIC_VECTOR (value'length-1 downto 0);
begin
if value'length < 1 then
return NUS;
else
if value'high < 0 then
if value(value'high) = 'Z' then
return to_ostring (resize (sfixed(value), 2, value'low));
else
return to_ostring (resize (value, 2, value'low));
end if;
elsif value'low >= 0 then
if Is_X (value(value'low)) then
subval := (others => value(value'low));
subval (value'range) := value;
return to_ostring(subval);
else
return to_ostring (resize (value, value'high, -3));
end if;
else
slv := to_sulv (value);
if Is_X (value (value'low)) then
lpad := (others => value (value'low));
else
lpad := (others => '0');
end if;
return to_ostring(slv(slv'high downto slv'high-VALUE'high))
& "."
& to_ostring(slv(slv'high-VALUE'high-1 downto 0) & lpad);
end if;
end if;
end function to_ostring;
function to_hstring (value : UNRESOLVED_ufixed) return STRING is
constant lne : INTEGER := (-VALUE'low+3)/4;
variable subval : UNRESOLVED_ufixed (value'high downto -4);
variable lpad : STD_ULOGIC_VECTOR (0 to (lne*4 + VALUE'low) -1);
variable slv : STD_ULOGIC_VECTOR (value'length-1 downto 0);
begin
if value'length < 1 then
return NUS;
else
if value'high < 0 then
if value(value'high) = 'Z' then
return to_hstring (resize (sfixed(value), 3, value'low));
else
return to_hstring (resize (value, 3, value'low));
end if;
elsif value'low >= 0 then
if Is_X (value(value'low)) then
subval := (others => value(value'low));
subval (value'range) := value;
return to_hstring(subval);
else
return to_hstring (resize (value, value'high, -4));
end if;
else
slv := to_sulv (value);
if Is_X (value (value'low)) then
lpad := (others => value(value'low));
else
lpad := (others => '0');
end if;
return to_hstring(slv(slv'high downto slv'high-VALUE'high))
& "."
& to_hstring(slv(slv'high-VALUE'high-1 downto 0)&lpad);
end if;
end if;
end function to_hstring;
function to_ostring (value : UNRESOLVED_sfixed) return STRING is
constant ne : INTEGER := ((value'high+1)+2)/3;
variable pad : STD_ULOGIC_VECTOR(0 to (ne*3 - (value'high+1)) - 1);
constant lne : INTEGER := (-VALUE'low+2)/3;
variable subval : UNRESOLVED_sfixed (value'high downto -3);
variable lpad : STD_ULOGIC_VECTOR (0 to (lne*3 + VALUE'low) -1);
variable slv : STD_ULOGIC_VECTOR (VALUE'high - VALUE'low downto 0);
begin
if value'length < 1 then
return NUS;
else
if value'high < 0 then
return to_ostring (resize (value, 2, value'low));
elsif value'low >= 0 then
if Is_X (value(value'low)) then
subval := (others => value(value'low));
subval (value'range) := value;
return to_ostring(subval);
else
return to_ostring (resize (value, value'high, -3));
end if;
else
pad := (others => value(value'high));
slv := to_sulv (value);
if Is_X (value (value'low)) then
lpad := (others => value(value'low));
else
lpad := (others => '0');
end if;
return to_ostring(pad & slv(slv'high downto slv'high-VALUE'high))
& "."
& to_ostring(slv(slv'high-VALUE'high-1 downto 0) & lpad);
end if;
end if;
end function to_ostring;
function to_hstring (value : UNRESOLVED_sfixed) return STRING is
constant ne : INTEGER := ((value'high+1)+3)/4;
variable pad : STD_ULOGIC_VECTOR(0 to (ne*4 - (value'high+1)) - 1);
constant lne : INTEGER := (-VALUE'low+3)/4;
variable subval : UNRESOLVED_sfixed (value'high downto -4);
variable lpad : STD_ULOGIC_VECTOR (0 to (lne*4 + VALUE'low) -1);
variable slv : STD_ULOGIC_VECTOR (value'length-1 downto 0);
begin
if value'length < 1 then
return NUS;
else
if value'high < 0 then
return to_hstring (resize (value, 3, value'low));
elsif value'low >= 0 then
if Is_X (value(value'low)) then
subval := (others => value(value'low));
subval (value'range) := value;
return to_hstring(subval);
else
return to_hstring (resize (value, value'high, -4));
end if;
else
slv := to_sulv (value);
pad := (others => value(value'high));
if Is_X (value (value'low)) then
lpad := (others => value(value'low));
else
lpad := (others => '0');
end if;
return to_hstring(pad & slv(slv'high downto slv'high-VALUE'high))
& "."
& to_hstring(slv(slv'high-VALUE'high-1 downto 0) & lpad);
end if;
end if;
end function to_hstring;
-- From string functions allow you to convert a string into a fixed
-- point number. Example:
-- signal uf1 : ufixed (3 downto -3);
-- uf1 <= from_string ("0110.100", uf1'high, uf1'low); -- 6.5
-- The "." is optional in this syntax, however it exist and is
-- in the wrong location an error is produced. Overflow will
-- result in saturation.
function from_string (
bstring : STRING; -- binary string
constant left_index : INTEGER;
constant right_index : INTEGER)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (left_index downto right_index);
variable L : LINE;
variable good : BOOLEAN;
begin
L := new STRING'(bstring);
read (L, result, good);
deallocate (L);
assert (good)
report fixed_generic_pkg'instance_name
& "from_string: Bad string "& bstring severity error;
return result;
end function from_string;
-- Octal and hex conversions work as follows:
-- uf1 <= from_hstring ("6.8", 3, -3); -- 6.5 (bottom zeros dropped)
-- uf1 <= from_ostring ("06.4", 3, -3); -- 6.5 (top zeros dropped)
function from_ostring (
ostring : STRING; -- Octal string
constant left_index : INTEGER;
constant right_index : INTEGER)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (left_index downto right_index);
variable L : LINE;
variable good : BOOLEAN;
begin
L := new STRING'(ostring);
oread (L, result, good);
deallocate (L);
assert (good)
report fixed_generic_pkg'instance_name
& "from_ostring: Bad string "& ostring severity error;
return result;
end function from_ostring;
function from_hstring (
hstring : STRING; -- hex string
constant left_index : INTEGER;
constant right_index : INTEGER)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (left_index downto right_index);
variable L : LINE;
variable good : BOOLEAN;
begin
L := new STRING'(hstring);
hread (L, result, good);
deallocate (L);
assert (good)
report fixed_generic_pkg'instance_name
& "from_hstring: Bad string "& hstring severity error;
return result;
end function from_hstring;
function from_string (
bstring : STRING; -- binary string
constant left_index : INTEGER;
constant right_index : INTEGER)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (left_index downto right_index);
variable L : LINE;
variable good : BOOLEAN;
begin
L := new STRING'(bstring);
read (L, result, good);
deallocate (L);
assert (good)
report fixed_generic_pkg'instance_name
& "from_string: Bad string "& bstring severity error;
return result;
end function from_string;
function from_ostring (
ostring : STRING; -- Octal string
constant left_index : INTEGER;
constant right_index : INTEGER)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (left_index downto right_index);
variable L : LINE;
variable good : BOOLEAN;
begin
L := new STRING'(ostring);
oread (L, result, good);
deallocate (L);
assert (good)
report fixed_generic_pkg'instance_name
& "from_ostring: Bad string "& ostring severity error;
return result;
end function from_ostring;
function from_hstring (
hstring : STRING; -- hex string
constant left_index : INTEGER;
constant right_index : INTEGER)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (left_index downto right_index);
variable L : LINE;
variable good : BOOLEAN;
begin
L := new STRING'(hstring);
hread (L, result, good);
deallocate (L);
assert (good)
report fixed_generic_pkg'instance_name
& "from_hstring: Bad string "& hstring severity error;
return result;
end function from_hstring;
-- Same as above, "size_res" is used for it's range only.
function from_string (
bstring : STRING; -- binary string
size_res : UNRESOLVED_ufixed)
return UNRESOLVED_ufixed is
begin
return from_string (bstring, size_res'high, size_res'low);
end function from_string;
function from_ostring (
ostring : STRING; -- Octal string
size_res : UNRESOLVED_ufixed)
return UNRESOLVED_ufixed is
begin
return from_ostring (ostring, size_res'high, size_res'low);
end function from_ostring;
function from_hstring (
hstring : STRING; -- hex string
size_res : UNRESOLVED_ufixed)
return UNRESOLVED_ufixed is
begin
return from_hstring(hstring, size_res'high, size_res'low);
end function from_hstring;
function from_string (
bstring : STRING; -- binary string
size_res : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed is
begin
return from_string (bstring, size_res'high, size_res'low);
end function from_string;
function from_ostring (
ostring : STRING; -- Octal string
size_res : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed is
begin
return from_ostring (ostring, size_res'high, size_res'low);
end function from_ostring;
function from_hstring (
hstring : STRING; -- hex string
size_res : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed is
begin
return from_hstring (hstring, size_res'high, size_res'low);
end function from_hstring;
-- Direct conversion functions. Example:
-- signal uf1 : ufixed (3 downto -3);
-- uf1 <= from_string ("0110.100"); -- 6.5
-- In this case the "." is not optional, and the size of
-- the output must match exactly.
-- purpose: Calculate the string boundaries
procedure calculate_string_boundry (
arg : in STRING; -- input string
left_index : out INTEGER; -- left
right_index : out INTEGER) is -- right
-- examples "10001.111" would return +4, -3
-- "07X.44" would return +2, -2 (then the octal routine would multiply)
-- "A_B_._C" would return +1, -1 (then the hex routine would multiply)
alias xarg : STRING (arg'length downto 1) is arg; -- make it downto range
variable l, r : INTEGER; -- internal indexes
variable founddot : BOOLEAN := false;
begin
if arg'length > 0 then
l := xarg'high - 1;
r := 0;
for i in xarg'range loop
if xarg(i) = '_' then
if r = 0 then
l := l - 1;
else
r := r + 1;
end if;
elsif xarg(i) = ' ' or xarg(i) = NBSP or xarg(i) = HT then
report fixed_generic_pkg'instance_name
& "Found a space in the input STRING " & xarg
severity error;
elsif xarg(i) = '.' then
if founddot then
report fixed_generic_pkg'instance_name
& "Found two binary points in input string " & xarg
severity error;
else
l := l - i;
r := -i + 1;
founddot := true;
end if;
end if;
end loop;
left_index := l;
right_index := r;
else
left_index := 0;
right_index := 0;
end if;
end procedure calculate_string_boundry;
-- Direct conversion functions. Example:
-- signal uf1 : ufixed (3 downto -3);
-- uf1 <= from_string ("0110.100"); -- 6.5
-- In this case the "." is not optional, and the size of
-- the output must match exactly.
function from_string (
bstring : STRING) -- binary string
return UNRESOLVED_ufixed
is
variable left_index, right_index : INTEGER;
begin
calculate_string_boundry (bstring, left_index, right_index);
return from_string (bstring, left_index, right_index);
end function from_string;
-- Direct octal and hex conversion functions. In this case
-- the string lengths must match. Example:
-- signal sf1 := sfixed (5 downto -3);
-- sf1 <= from_ostring ("71.4") -- -6.5
function from_ostring (
ostring : STRING) -- Octal string
return UNRESOLVED_ufixed
is
variable left_index, right_index : INTEGER;
begin
calculate_string_boundry (ostring, left_index, right_index);
return from_ostring (ostring, ((left_index+1)*3)-1, right_index*3);
end function from_ostring;
function from_hstring (
hstring : STRING) -- hex string
return UNRESOLVED_ufixed
is
variable left_index, right_index : INTEGER;
begin
calculate_string_boundry (hstring, left_index, right_index);
return from_hstring (hstring, ((left_index+1)*4)-1, right_index*4);
end function from_hstring;
function from_string (
bstring : STRING) -- binary string
return UNRESOLVED_sfixed
is
variable left_index, right_index : INTEGER;
begin
calculate_string_boundry (bstring, left_index, right_index);
return from_string (bstring, left_index, right_index);
end function from_string;
function from_ostring (
ostring : STRING) -- Octal string
return UNRESOLVED_sfixed
is
variable left_index, right_index : INTEGER;
begin
calculate_string_boundry (ostring, left_index, right_index);
return from_ostring (ostring, ((left_index+1)*3)-1, right_index*3);
end function from_ostring;
function from_hstring (
hstring : STRING) -- hex string
return UNRESOLVED_sfixed
is
variable left_index, right_index : INTEGER;
begin
calculate_string_boundry (hstring, left_index, right_index);
return from_hstring (hstring, ((left_index+1)*4)-1, right_index*4);
end function from_hstring;
end package body fixed_generic_pkg;
|
-- --------------------------------------------------------------------
--
-- Copyright © 2008 by IEEE. All rights reserved.
--
-- This source file is an essential part of IEEE Std 1076-2008,
-- IEEE Standard VHDL Language Reference Manual. This source file may not be
-- copied, sold, or included with software that is sold without written
-- permission from the IEEE Standards Department. This source file may be
-- copied for individual use between licensed users. This source file is
-- provided on an AS IS basis. The IEEE disclaims ANY WARRANTY EXPRESS OR
-- IMPLIED INCLUDING ANY WARRANTY OF MERCHANTABILITY AND FITNESS FOR USE
-- FOR A PARTICULAR PURPOSE. The user of the source file shall indemnify
-- and hold IEEE harmless from any damages or liability arising out of the
-- use thereof.
--
-- Title : Fixed-point package (Generic package body)
-- :
-- Library : This package shall be compiled into a library
-- : symbolically named IEEE.
-- :
-- Developers: Accellera VHDL-TC and IEEE P1076 Working Group
-- :
-- Purpose : This packages defines basic binary fixed point arithmetic
-- : arithmetic functions
-- :
-- Note : This package may be modified to include additional data
-- : required by tools, but it must in no way change the
-- : external interfaces or simulation behavior of the
-- : description. It is permissible to add comments and/or
-- : attributes to the package declarations, but not to change
-- : or delete any original lines of the package declaration.
-- : The package body may be changed only in accordance with
-- : the terms of Clause 16 of this standard.
-- :
-- --------------------------------------------------------------------
-- $Revision: 1220 $
-- $Date: 2008-04-10 17:16:09 +0930 (Thu, 10 Apr 2008) $
-- --------------------------------------------------------------------
library IEEE;
use IEEE.MATH_REAL.all;
package body fixed_generic_pkg is
-- Author David Bishop (dbishop@vhdl.org)
-- Other contributers: Jim Lewis, Yannick Grugni, Ryan W. Hilton
-- null array constants
constant NAUF : UNRESOLVED_ufixed (0 downto 1) := (others => '0');
constant NASF : UNRESOLVED_sfixed (0 downto 1) := (others => '0');
constant NSLV : STD_ULOGIC_VECTOR (0 downto 1) := (others => '0');
-- This differed constant will tell you if the package body is synthesizable
-- or implemented as real numbers, set to "true" if synthesizable.
constant fixedsynth_or_real : BOOLEAN := true;
-- Special version of "minimum" to do some boundary checking without errors
function mins (l, r : INTEGER)
return INTEGER is
begin -- function mins
if (L = INTEGER'low or R = INTEGER'low) then
return 0; -- error condition, silent
end if;
return minimum (L, R);
end function mins;
-- Special version of "minimum" to do some boundary checking with errors
function mine (l, r : INTEGER)
return INTEGER is
begin -- function mine
if (L = INTEGER'low or R = INTEGER'low) then
report fixed_generic_pkg'instance_name
& " Unbounded number passed, was a literal used?"
severity error;
return 0;
end if;
return minimum (L, R);
end function mine;
-- The following functions are used only internally. Every function
-- calls "cleanvec" either directly or indirectly.
-- purpose: Fixes "downto" problem and resolves meta states
function cleanvec (
arg : UNRESOLVED_sfixed) -- input
return UNRESOLVED_sfixed
is
constant left_index : INTEGER := maximum(arg'left, arg'right);
constant right_index : INTEGER := mins(arg'left, arg'right);
variable result : UNRESOLVED_sfixed (arg'range);
begin -- function cleanvec
assert not (arg'ascending and (arg'low /= INTEGER'low))
report fixed_generic_pkg'instance_name
& " Vector passed using a ""to"" range, expected is ""downto"""
severity error;
return arg;
end function cleanvec;
-- purpose: Fixes "downto" problem and resolves meta states
function cleanvec (
arg : UNRESOLVED_ufixed) -- input
return UNRESOLVED_ufixed
is
constant left_index : INTEGER := maximum(arg'left, arg'right);
constant right_index : INTEGER := mins(arg'left, arg'right);
variable result : UNRESOLVED_ufixed (arg'range);
begin -- function cleanvec
assert not (arg'ascending and (arg'low /= INTEGER'low))
report fixed_generic_pkg'instance_name
& " Vector passed using a ""to"" range, expected is ""downto"""
severity error;
return arg;
end function cleanvec;
-- Type convert a "unsigned" into a "ufixed", used internally
function to_fixed (
arg : UNRESOLVED_UNSIGNED; -- shifted vector
constant left_index : INTEGER;
constant right_index : INTEGER)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (left_index downto right_index);
begin -- function to_fixed
result := UNRESOLVED_ufixed(arg);
return result;
end function to_fixed;
-- Type convert a "signed" into an "sfixed", used internally
function to_fixed (
arg : UNRESOLVED_SIGNED; -- shifted vector
constant left_index : INTEGER;
constant right_index : INTEGER)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (left_index downto right_index);
begin -- function to_fixed
result := UNRESOLVED_sfixed(arg);
return result;
end function to_fixed;
-- Type convert a "ufixed" into an "unsigned", used internally
function to_uns (
arg : UNRESOLVED_ufixed) -- fp vector
return UNRESOLVED_UNSIGNED
is
subtype t is UNRESOLVED_UNSIGNED(arg'high - arg'low downto 0);
variable slv : t;
begin -- function to_uns
slv := t(arg);
return slv;
end function to_uns;
-- Type convert an "sfixed" into a "signed", used internally
function to_s (
arg : UNRESOLVED_sfixed) -- fp vector
return UNRESOLVED_SIGNED
is
subtype t is UNRESOLVED_SIGNED(arg'high - arg'low downto 0);
variable slv : t;
begin -- function to_s
slv := t(arg);
return slv;
end function to_s;
-- adds 1 to the LSB of the number
procedure round_up (arg : in UNRESOLVED_ufixed;
result : out UNRESOLVED_ufixed;
overflowx : out BOOLEAN) is
variable arguns, resuns : UNRESOLVED_UNSIGNED (arg'high-arg'low+1 downto 0)
:= (others => '0');
begin -- round_up
arguns (arguns'high-1 downto 0) := to_uns (arg);
resuns := arguns + 1;
result := to_fixed(resuns(arg'high-arg'low
downto 0), arg'high, arg'low);
overflowx := (resuns(resuns'high) = '1');
end procedure round_up;
-- adds 1 to the LSB of the number
procedure round_up (arg : in UNRESOLVED_sfixed;
result : out UNRESOLVED_sfixed;
overflowx : out BOOLEAN) is
variable args, ress : UNRESOLVED_SIGNED (arg'high-arg'low+1 downto 0);
begin -- round_up
args (args'high-1 downto 0) := to_s (arg);
args(args'high) := arg(arg'high); -- sign extend
ress := args + 1;
result := to_fixed(ress (ress'high-1
downto 0), arg'high, arg'low);
overflowx := ((arg(arg'high) /= ress(ress'high-1))
and (or (STD_ULOGIC_VECTOR(ress)) /= '0'));
end procedure round_up;
-- Rounding - Performs a "round_nearest" (IEEE 754) which rounds up
-- when the remainder is > 0.5. If the remainder IS 0.5 then if the
-- bottom bit is a "1" it is rounded, otherwise it remains the same.
function round_fixed (arg : UNRESOLVED_ufixed;
remainder : UNRESOLVED_ufixed;
overflow_style : fixed_overflow_style_type := fixed_overflow_style)
return UNRESOLVED_ufixed
is
variable rounds : BOOLEAN;
variable round_overflow : BOOLEAN;
variable result : UNRESOLVED_ufixed (arg'range);
begin
rounds := false;
if (remainder'length > 1) then
if (remainder (remainder'high) = '1') then
rounds := (arg(arg'low) = '1')
or (or (to_sulv(remainder(remainder'high-1 downto
remainder'low))) = '1');
end if;
else
rounds := (arg(arg'low) = '1') and (remainder (remainder'high) = '1');
end if;
if rounds then
round_up(arg => arg,
result => result,
overflowx => round_overflow);
else
result := arg;
end if;
if (overflow_style = fixed_saturate) and round_overflow then
result := saturate (result'high, result'low);
end if;
return result;
end function round_fixed;
-- Rounding case statement
function round_fixed (arg : UNRESOLVED_sfixed;
remainder : UNRESOLVED_sfixed;
overflow_style : fixed_overflow_style_type := fixed_overflow_style)
return UNRESOLVED_sfixed
is
variable rounds : BOOLEAN;
variable round_overflow : BOOLEAN;
variable result : UNRESOLVED_sfixed (arg'range);
begin
rounds := false;
if (remainder'length > 1) then
if (remainder (remainder'high) = '1') then
rounds := (arg(arg'low) = '1')
or (or (to_sulv(remainder(remainder'high-1 downto
remainder'low))) = '1');
end if;
else
rounds := (arg(arg'low) = '1') and (remainder (remainder'high) = '1');
end if;
if rounds then
round_up(arg => arg,
result => result,
overflowx => round_overflow);
else
result := arg;
end if;
if round_overflow then
if (overflow_style = fixed_saturate) then
if arg(arg'high) = '0' then
result := saturate (result'high, result'low);
else
result := not saturate (result'high, result'low);
end if;
-- Sign bit not fixed when wrapping
end if;
end if;
return result;
end function round_fixed;
-- converts an sfixed into a ufixed. The output is the same length as the
-- input, because abs("1000") = "1000" = 8.
function to_ufixed (
arg : UNRESOLVED_sfixed)
return UNRESOLVED_ufixed
is
constant left_index : INTEGER := arg'high;
constant right_index : INTEGER := mine(arg'low, arg'low);
variable xarg : UNRESOLVED_sfixed(left_index+1 downto right_index);
variable result : UNRESOLVED_ufixed(left_index downto right_index);
begin
if arg'length < 1 then
return NAUF;
end if;
xarg := abs(arg);
result := UNRESOLVED_ufixed (xarg (left_index downto right_index));
return result;
end function to_ufixed;
-----------------------------------------------------------------------------
-- Visible functions
-----------------------------------------------------------------------------
-- Conversion functions. These are needed for synthesis where typically
-- the only input and output type is a std_logic_vector.
function to_sulv (
arg : UNRESOLVED_ufixed) -- fixed point vector
return STD_ULOGIC_VECTOR
is
subtype result_subtype is STD_ULOGIC_VECTOR (arg'length-1 downto 0);
variable result : result_subtype;
begin
if arg'length < 1 then
return NSLV;
end if;
result := result_subtype (arg);
return result;
end function to_sulv;
function to_sulv (
arg : UNRESOLVED_sfixed) -- fixed point vector
return STD_ULOGIC_VECTOR
is
subtype result_subtype is STD_ULOGIC_VECTOR (arg'length-1 downto 0);
variable result : result_subtype;
--variable result : STD_ULOGIC_VECTOR (arg'length-1 downto 0);
begin
if arg'length < 1 then
return NSLV;
end if;
--result := STD_ULOGIC_VECTOR (arg);
result := result_subtype (arg);
return result;
end function to_sulv;
function to_slv (
arg : UNRESOLVED_ufixed) -- fixed point vector
return STD_LOGIC_VECTOR is
begin
return to_sulv(arg);
end function to_slv;
function to_slv (
arg : UNRESOLVED_sfixed) -- fixed point vector
return STD_LOGIC_VECTOR is
begin
return to_sulv(arg);
end function to_slv;
function to_ufixed (
arg : STD_ULOGIC_VECTOR; -- shifted vector
constant left_index : INTEGER;
constant right_index : INTEGER)
return unresolved_ufixed
is
variable result : UNRESOLVED_ufixed (left_index downto right_index);
begin
if (arg'length < 1 or right_index > left_index) then
return NAUF;
end if;
if (arg'length /= result'length) then
report fixed_generic_pkg'instance_name & "TO_UFIXED(SLV) "
& "Vector lengths do not match. Input length is "
& INTEGER'image(arg'length) & " and output will be "
& INTEGER'image(result'length) & " wide."
severity error;
return NAUF;
else
result := to_fixed (arg => UNRESOLVED_UNSIGNED(arg),
left_index => left_index,
right_index => right_index);
return result;
end if;
end function to_ufixed;
function to_sfixed (
arg : STD_ULOGIC_VECTOR; -- shifted vector
constant left_index : INTEGER;
constant right_index : INTEGER)
return unresolved_sfixed
is
variable result : UNRESOLVED_sfixed (left_index downto right_index);
begin
if (arg'length < 1 or right_index > left_index) then
return NASF;
end if;
if (arg'length /= result'length) then
report fixed_generic_pkg'instance_name & "TO_SFIXED(SLV) "
& "Vector lengths do not match. Input length is "
& INTEGER'image(arg'length) & " and output will be "
& INTEGER'image(result'length) & " wide."
severity error;
return NASF;
else
result := to_fixed (arg => UNRESOLVED_SIGNED(arg),
left_index => left_index,
right_index => right_index);
return result;
end if;
end function to_sfixed;
-- Two's complement number, Grows the vector by 1 bit.
-- because "abs (1000.000) = 01000.000" or abs(-16) = 16.
function "abs" (
arg : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed
is
constant left_index : INTEGER := arg'high;
constant right_index : INTEGER := mine(arg'low, arg'low);
variable ressns : UNRESOLVED_SIGNED (arg'length downto 0);
variable result : UNRESOLVED_sfixed (left_index+1 downto right_index);
begin
if (arg'length < 1 or result'length < 1) then
return NASF;
end if;
ressns (arg'length-1 downto 0) := to_s (cleanvec (arg));
ressns (arg'length) := ressns (arg'length-1); -- expand sign bit
result := to_fixed (abs(ressns), left_index+1, right_index);
return result;
end function "abs";
-- also grows the vector by 1 bit.
function "-" (
arg : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed
is
constant left_index : INTEGER := arg'high+1;
constant right_index : INTEGER := mine(arg'low, arg'low);
variable ressns : UNRESOLVED_SIGNED (arg'length downto 0);
variable result : UNRESOLVED_sfixed (left_index downto right_index);
begin
if (arg'length < 1 or result'length < 1) then
return NASF;
end if;
ressns (arg'length-1 downto 0) := to_s (cleanvec(arg));
ressns (arg'length) := ressns (arg'length-1); -- expand sign bit
result := to_fixed (-ressns, left_index, right_index);
return result;
end function "-";
-- Addition
function "+" (
l, r : UNRESOLVED_ufixed) -- ufixed(a downto b) + ufixed(c downto d) =
return UNRESOLVED_ufixed -- ufixed(max(a,c)+1 downto min(b,d))
is
constant left_index : INTEGER := maximum(l'high, r'high)+1;
constant right_index : INTEGER := mine(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
variable result : UNRESOLVED_ufixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_UNSIGNED (left_index-right_index
downto 0);
variable result_slv : UNRESOLVED_UNSIGNED (left_index-right_index
downto 0);
begin
if (l'length < 1 or r'length < 1 or result'length < 1) then
return NAUF;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_uns (lresize);
rslv := to_uns (rresize);
result_slv := lslv + rslv;
result := to_fixed(result_slv, left_index, right_index);
return result;
end function "+";
function "+" (
l, r : UNRESOLVED_sfixed) -- sfixed(a downto b) + sfixed(c downto d) =
return UNRESOLVED_sfixed -- sfixed(max(a,c)+1 downto min(b,d))
is
constant left_index : INTEGER := maximum(l'high, r'high)+1;
constant right_index : INTEGER := mine(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
variable result : UNRESOLVED_sfixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_SIGNED (left_index-right_index downto 0);
variable result_slv : UNRESOLVED_SIGNED (left_index-right_index downto 0);
begin
if (l'length < 1 or r'length < 1 or result'length < 1) then
return NASF;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_s (lresize);
rslv := to_s (rresize);
result_slv := lslv + rslv;
result := to_fixed(result_slv, left_index, right_index);
return result;
end function "+";
-- Subtraction
function "-" (
l, r : UNRESOLVED_ufixed) -- ufixed(a downto b) - ufixed(c downto d) =
return UNRESOLVED_ufixed -- ufixed(max(a,c)+1 downto min(b,d))
is
constant left_index : INTEGER := maximum(l'high, r'high)+1;
constant right_index : INTEGER := mine(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
variable result : UNRESOLVED_ufixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_UNSIGNED (left_index-right_index
downto 0);
variable result_slv : UNRESOLVED_UNSIGNED (left_index-right_index
downto 0);
begin
if (l'length < 1 or r'length < 1 or result'length < 1) then
return NAUF;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_uns (lresize);
rslv := to_uns (rresize);
result_slv := lslv - rslv;
result := to_fixed(result_slv, left_index, right_index);
return result;
end function "-";
function "-" (
l, r : UNRESOLVED_sfixed) -- sfixed(a downto b) - sfixed(c downto d) =
return UNRESOLVED_sfixed -- sfixed(max(a,c)+1 downto min(b,d))
is
constant left_index : INTEGER := maximum(l'high, r'high)+1;
constant right_index : INTEGER := mine(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
variable result : UNRESOLVED_sfixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_SIGNED (left_index-right_index downto 0);
variable result_slv : UNRESOLVED_SIGNED (left_index-right_index downto 0);
begin
if (l'length < 1 or r'length < 1 or result'length < 1) then
return NASF;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_s (lresize);
rslv := to_s (rresize);
result_slv := lslv - rslv;
result := to_fixed(result_slv, left_index, right_index);
return result;
end function "-";
function "*" (
l, r : UNRESOLVED_ufixed) -- ufixed(a downto b) * ufixed(c downto d) =
return UNRESOLVED_ufixed -- ufixed(a+c+1 downto b+d)
is
variable lslv : UNRESOLVED_UNSIGNED (l'length-1 downto 0);
variable rslv : UNRESOLVED_UNSIGNED (r'length-1 downto 0);
variable result_slv : UNRESOLVED_UNSIGNED (r'length+l'length-1 downto 0);
variable result : UNRESOLVED_ufixed (l'high + r'high+1 downto
mine(l'low, l'low) + mine(r'low, r'low));
begin
if (l'length < 1 or r'length < 1 or
result'length /= result_slv'length) then
return NAUF;
end if;
lslv := to_uns (cleanvec(l));
rslv := to_uns (cleanvec(r));
result_slv := lslv * rslv;
result := to_fixed (result_slv, result'high, result'low);
return result;
end function "*";
function "*" (
l, r : UNRESOLVED_sfixed) -- sfixed(a downto b) * sfixed(c downto d) =
return UNRESOLVED_sfixed -- sfixed(a+c+1 downto b+d)
is
variable lslv : UNRESOLVED_SIGNED (l'length-1 downto 0);
variable rslv : UNRESOLVED_SIGNED (r'length-1 downto 0);
variable result_slv : UNRESOLVED_SIGNED (r'length+l'length-1 downto 0);
variable result : UNRESOLVED_sfixed (l'high + r'high+1 downto
mine(l'low, l'low) + mine(r'low, r'low));
begin
if (l'length < 1 or r'length < 1 or
result'length /= result_slv'length) then
return NASF;
end if;
lslv := to_s (cleanvec(l));
rslv := to_s (cleanvec(r));
result_slv := lslv * rslv;
result := to_fixed (result_slv, result'high, result'low);
return result;
end function "*";
function "/" (
l, r : UNRESOLVED_ufixed) -- ufixed(a downto b) / ufixed(c downto d) =
return UNRESOLVED_ufixed is -- ufixed(a-d downto b-c-1)
begin
return divide (l, r);
end function "/";
function "/" (
l, r : UNRESOLVED_sfixed) -- sfixed(a downto b) / sfixed(c downto d) =
return UNRESOLVED_sfixed is -- sfixed(a-d+1 downto b-c)
begin
return divide (l, r);
end function "/";
-- This version of divide gives the user more control
-- ufixed(a downto b) / ufixed(c downto d) = ufixed(a-d downto b-c-1)
function divide (
l, r : UNRESOLVED_ufixed;
constant round_style : fixed_round_style_type := fixed_round_style;
constant guard_bits : NATURAL := fixed_guard_bits)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (l'high - mine(r'low, r'low) downto
mine (l'low, l'low) - r'high -1);
variable dresult : UNRESOLVED_ufixed (result'high downto result'low -guard_bits);
variable lresize : UNRESOLVED_ufixed (l'high downto l'high - dresult'length+1);
variable lslv : UNRESOLVED_UNSIGNED (lresize'length-1 downto 0);
variable rslv : UNRESOLVED_UNSIGNED (r'length-1 downto 0);
variable result_slv : UNRESOLVED_UNSIGNED (lresize'length-1 downto 0);
begin
if (l'length < 1 or r'length < 1 or
mins(r'low, r'low) /= r'low or mins(l'low, l'low) /= l'low) then
return NAUF;
end if;
lresize := resize (arg => l,
left_index => lresize'high,
right_index => lresize'low,
overflow_style => fixed_wrap, -- vector only grows
round_style => fixed_truncate);
lslv := to_uns (cleanvec (lresize));
rslv := to_uns (cleanvec (r));
if (rslv = 0) then
report fixed_generic_pkg'instance_name
& "DIVIDE(ufixed) Division by zero" severity error;
result := saturate (result'high, result'low); -- saturate
else
result_slv := lslv / rslv;
dresult := to_fixed (result_slv, dresult'high, dresult'low);
result := resize (arg => dresult,
left_index => result'high,
right_index => result'low,
overflow_style => fixed_wrap, -- overflow impossible
round_style => round_style);
end if;
return result;
end function divide;
-- sfixed(a downto b) / sfixed(c downto d) = sfixed(a-d+1 downto b-c)
function divide (
l, r : UNRESOLVED_sfixed;
constant round_style : fixed_round_style_type := fixed_round_style;
constant guard_bits : NATURAL := fixed_guard_bits)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (l'high - mine(r'low, r'low) + 1 downto
mine (l'low, l'low) - r'high);
variable dresult : UNRESOLVED_sfixed (result'high downto result'low-guard_bits);
variable lresize : UNRESOLVED_sfixed (l'high+1 downto l'high+1 -dresult'length+1);
variable lslv : UNRESOLVED_SIGNED (lresize'length-1 downto 0);
variable rslv : UNRESOLVED_SIGNED (r'length-1 downto 0);
variable result_slv : UNRESOLVED_SIGNED (lresize'length-1 downto 0);
begin
if (l'length < 1 or r'length < 1 or
mins(r'low, r'low) /= r'low or mins(l'low, l'low) /= l'low) then
return NASF;
end if;
lresize := resize (arg => l,
left_index => lresize'high,
right_index => lresize'low,
overflow_style => fixed_wrap, -- vector only grows
round_style => fixed_truncate);
lslv := to_s (cleanvec (lresize));
rslv := to_s (cleanvec (r));
if (rslv = 0) then
report fixed_generic_pkg'instance_name
& "DIVIDE(sfixed) Division by zero" severity error;
result := saturate (result'high, result'low);
else
result_slv := lslv / rslv;
dresult := to_fixed (result_slv, dresult'high, dresult'low);
result := resize (arg => dresult,
left_index => result'high,
right_index => result'low,
overflow_style => fixed_wrap, -- overflow impossible
round_style => round_style);
end if;
return result;
end function divide;
-- 1 / ufixed(a downto b) = ufixed(-b downto -a-1)
function reciprocal (
arg : UNRESOLVED_ufixed; -- fixed point input
constant round_style : fixed_round_style_type := fixed_round_style;
constant guard_bits : NATURAL := fixed_guard_bits)
return UNRESOLVED_ufixed
is
constant one : UNRESOLVED_ufixed (0 downto 0) := "1";
begin
return divide (l => one,
r => arg,
round_style => round_style,
guard_bits => guard_bits);
end function reciprocal;
-- 1 / sfixed(a downto b) = sfixed(-b+1 downto -a)
function reciprocal (
arg : UNRESOLVED_sfixed; -- fixed point input
constant round_style : fixed_round_style_type := fixed_round_style;
constant guard_bits : NATURAL := fixed_guard_bits)
return UNRESOLVED_sfixed
is
constant one : UNRESOLVED_sfixed (1 downto 0) := "01"; -- extra bit.
variable resultx : UNRESOLVED_sfixed (-mine(arg'low, arg'low)+2 downto -arg'high);
begin
if (arg'length < 1 or resultx'length < 1) then
return NASF;
else
resultx := divide (l => one,
r => arg,
round_style => round_style,
guard_bits => guard_bits);
return resultx (resultx'high-1 downto resultx'low); -- remove extra bit
end if;
end function reciprocal;
-- ufixed (a downto b) rem ufixed (c downto d)
-- = ufixed (min(a,c) downto min(b,d))
function "rem" (
l, r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return remainder (l, r);
end function "rem";
-- remainder
-- sfixed (a downto b) rem sfixed (c downto d)
-- = sfixed (min(a,c) downto min(b,d))
function "rem" (
l, r : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed is
begin
return remainder (l, r);
end function "rem";
-- ufixed (a downto b) rem ufixed (c downto d)
-- = ufixed (min(a,c) downto min(b,d))
function remainder (
l, r : UNRESOLVED_ufixed; -- fixed point input
constant round_style : fixed_round_style_type := fixed_round_style;
constant guard_bits : NATURAL := fixed_guard_bits)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (minimum(l'high, r'high) downto
mine(l'low, r'low));
constant rlow : integer := mins(r'low, r'low);
variable lresize : UNRESOLVED_ufixed (maximum(l'high, r'low) downto
rlow-guard_bits);
variable rresize : UNRESOLVED_ufixed (r'high downto rlow-guard_bits);
variable dresult : UNRESOLVED_ufixed (rresize'range);
variable lslv : UNRESOLVED_UNSIGNED (lresize'length-1 downto 0);
variable rslv : UNRESOLVED_UNSIGNED (rresize'length-1 downto 0);
variable result_slv : UNRESOLVED_UNSIGNED (rslv'range);
begin
if (l'length < 1 or r'length < 1 or
mins(r'low, r'low) /= r'low or mins(l'low, l'low) /= l'low) then
return NAUF;
end if;
lresize := resize (arg => l,
left_index => lresize'high,
right_index => lresize'low,
overflow_style => fixed_wrap, -- vector only grows
round_style => fixed_truncate);
lslv := to_uns (lresize);
rresize := resize (arg => r,
left_index => rresize'high,
right_index => rresize'low,
overflow_style => fixed_wrap, -- vector only grows
round_style => fixed_truncate);
rslv := to_uns (rresize);
if (rslv = 0) then
report fixed_generic_pkg'instance_name
& "remainder(ufixed) Division by zero" severity error;
result := saturate (result'high, result'low); -- saturate
else
if (r'low <= l'high) then
result_slv := lslv rem rslv;
dresult := to_fixed (result_slv, dresult'high, dresult'low);
result := resize (arg => dresult,
left_index => result'high,
right_index => result'low,
overflow_style => fixed_wrap, -- can't overflow
round_style => round_style);
end if;
if l'low < r'low then
result(mins(r'low-1, l'high) downto l'low) :=
cleanvec(l(mins(r'low-1, l'high) downto l'low));
end if;
end if;
return result;
end function remainder;
-- remainder
-- sfixed (a downto b) rem sfixed (c downto d)
-- = sfixed (min(a,c) downto min(b,d))
function remainder (
l, r : UNRESOLVED_sfixed; -- fixed point input
constant round_style : fixed_round_style_type := fixed_round_style;
constant guard_bits : NATURAL := fixed_guard_bits)
return UNRESOLVED_sfixed
is
variable l_abs : UNRESOLVED_ufixed (l'range);
variable r_abs : UNRESOLVED_ufixed (r'range);
variable result : UNRESOLVED_sfixed (minimum(r'high, l'high) downto
mine(r'low, l'low));
variable neg_result : UNRESOLVED_sfixed (minimum(r'high, l'high)+1 downto
mins(r'low, l'low));
begin
if (l'length < 1 or r'length < 1 or
mins(r'low, r'low) /= r'low or mins(l'low, l'low) /= l'low) then
return NASF;
end if;
l_abs := to_ufixed (l);
r_abs := to_ufixed (r);
result := UNRESOLVED_sfixed (remainder (
l => l_abs,
r => r_abs,
round_style => round_style));
neg_result := -result;
if l(l'high) = '1' then
result := neg_result(result'range);
end if;
return result;
end function remainder;
-- modulo
-- ufixed (a downto b) mod ufixed (c downto d)
-- = ufixed (min(a,c) downto min(b, d))
function "mod" (
l, r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return modulo (l, r);
end function "mod";
-- sfixed (a downto b) mod sfixed (c downto d)
-- = sfixed (c downto min(b, d))
function "mod" (
l, r : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed is
begin
return modulo(l, r);
end function "mod";
-- modulo
-- ufixed (a downto b) mod ufixed (c downto d)
-- = ufixed (min(a,c) downto min(b, d))
function modulo (
l, r : UNRESOLVED_ufixed; -- fixed point input
constant round_style : fixed_round_style_type := fixed_round_style;
constant guard_bits : NATURAL := fixed_guard_bits)
return UNRESOLVED_ufixed is
begin
return remainder(l => l,
r => r,
round_style => round_style,
guard_bits => guard_bits);
end function modulo;
-- sfixed (a downto b) mod sfixed (c downto d)
-- = sfixed (c downto min(b, d))
function modulo (
l, r : UNRESOLVED_sfixed; -- fixed point input
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style;
constant guard_bits : NATURAL := fixed_guard_bits)
return UNRESOLVED_sfixed
is
variable l_abs : UNRESOLVED_ufixed (l'range);
variable r_abs : UNRESOLVED_ufixed (r'range);
variable result : UNRESOLVED_sfixed (r'high downto
mine(r'low, l'low));
variable dresult : UNRESOLVED_sfixed (minimum(r'high, l'high)+1 downto
mins(r'low, l'low));
variable dresult_not_zero : BOOLEAN;
begin
if (l'length < 1 or r'length < 1 or
mins(r'low, r'low) /= r'low or mins(l'low, l'low) /= l'low) then
return NASF;
end if;
l_abs := to_ufixed (l);
r_abs := to_ufixed (r);
dresult := "0" & UNRESOLVED_sfixed(remainder (l => l_abs,
r => r_abs,
round_style => round_style));
if (to_s(dresult) = 0) then
dresult_not_zero := false;
else
dresult_not_zero := true;
end if;
if to_x01(l(l'high)) = '1' and to_x01(r(r'high)) = '0'
and dresult_not_zero then
result := resize (arg => r - dresult,
left_index => result'high,
right_index => result'low,
overflow_style => overflow_style,
round_style => round_style);
elsif to_x01(l(l'high)) = '1' and to_x01(r(r'high)) = '1' then
result := resize (arg => -dresult,
left_index => result'high,
right_index => result'low,
overflow_style => overflow_style,
round_style => round_style);
elsif to_x01(l(l'high)) = '0' and to_x01(r(r'high)) = '1'
and dresult_not_zero then
result := resize (arg => dresult + r,
left_index => result'high,
right_index => result'low,
overflow_style => overflow_style,
round_style => round_style);
else
result := resize (arg => dresult,
left_index => result'high,
right_index => result'low,
overflow_style => overflow_style,
round_style => round_style);
end if;
return result;
end function modulo;
-- Procedure for those who need an "accumulator" function
procedure add_carry (
L, R : in UNRESOLVED_ufixed;
c_in : in STD_ULOGIC;
result : out UNRESOLVED_ufixed;
c_out : out STD_ULOGIC) is
constant left_index : INTEGER := maximum(l'high, r'high)+1;
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_UNSIGNED (left_index-right_index
downto 0);
variable result_slv : UNRESOLVED_UNSIGNED (left_index-right_index
downto 0);
variable cx : UNRESOLVED_UNSIGNED (0 downto 0); -- Carry in
begin
if (l'length < 1 or r'length < 1) then
result := NAUF;
c_out := '0';
else
cx (0) := c_in;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_uns (lresize);
rslv := to_uns (rresize);
result_slv := lslv + rslv + cx;
c_out := result_slv(left_index);
result := to_fixed(result_slv (left_index-right_index-1 downto 0),
left_index-1, right_index);
end if;
end procedure add_carry;
procedure add_carry (
L, R : in UNRESOLVED_sfixed;
c_in : in STD_ULOGIC;
result : out UNRESOLVED_sfixed;
c_out : out STD_ULOGIC) is
constant left_index : INTEGER := maximum(l'high, r'high)+1;
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_SIGNED (left_index-right_index
downto 0);
variable result_slv : UNRESOLVED_SIGNED (left_index-right_index
downto 0);
variable cx : UNRESOLVED_SIGNED (1 downto 0); -- Carry in
begin
if (l'length < 1 or r'length < 1) then
result := NASF;
c_out := '0';
else
cx (1) := '0';
cx (0) := c_in;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_s (lresize);
rslv := to_s (rresize);
result_slv := lslv + rslv + cx;
c_out := result_slv(left_index);
result := to_fixed(result_slv (left_index-right_index-1 downto 0),
left_index-1, right_index);
end if;
end procedure add_carry;
-- Scales the result by a power of 2. Width of input = width of output with
-- the decimal point moved.
function scalb (y : UNRESOLVED_ufixed; N : INTEGER)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (y'high+N downto y'low+N);
begin
if y'length < 1 then
return NAUF;
else
result := y;
return result;
end if;
end function scalb;
function scalb (y : UNRESOLVED_ufixed; N : UNRESOLVED_SIGNED)
return UNRESOLVED_ufixed is
begin
return scalb (y => y,
N => to_integer(N));
end function scalb;
function scalb (y : UNRESOLVED_sfixed; N : INTEGER)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (y'high+N downto y'low+N);
begin
if y'length < 1 then
return NASF;
else
result := y;
return result;
end if;
end function scalb;
function scalb (y : UNRESOLVED_sfixed; N : UNRESOLVED_SIGNED)
return UNRESOLVED_sfixed is
begin
return scalb (y => y,
N => to_integer(N));
end function scalb;
function Is_Negative (arg : UNRESOLVED_sfixed) return BOOLEAN is
begin
if to_X01(arg(arg'high)) = '1' then
return true;
else
return false;
end if;
end function Is_Negative;
function find_rightmost (arg : UNRESOLVED_ufixed; y : STD_ULOGIC)
return INTEGER is
begin
for_loop : for i in arg'reverse_range loop
if arg(i) ?= y then
return i;
end if;
end loop;
return arg'high+1; -- return out of bounds 'high
end function find_rightmost;
function find_leftmost (arg : UNRESOLVED_ufixed; y : STD_ULOGIC)
return INTEGER is
begin
for_loop : for i in arg'range loop
if arg(i) ?= y then
return i;
end if;
end loop;
return arg'low-1; -- return out of bounds 'low
end function find_leftmost;
function find_rightmost (arg : UNRESOLVED_sfixed; y : STD_ULOGIC)
return INTEGER is
begin
for_loop : for i in arg'reverse_range loop
if arg(i) ?= y then
return i;
end if;
end loop;
return arg'high+1; -- return out of bounds 'high
end function find_rightmost;
function find_leftmost (arg : UNRESOLVED_sfixed; y : STD_ULOGIC)
return INTEGER is
begin
for_loop : for i in arg'range loop
if arg(i) ?= y then
return i;
end if;
end loop;
return arg'low-1; -- return out of bounds 'low
end function find_leftmost;
function "sll" (ARG : UNRESOLVED_ufixed; COUNT : INTEGER)
return UNRESOLVED_ufixed
is
variable argslv : UNRESOLVED_UNSIGNED (arg'length-1 downto 0);
variable result : UNRESOLVED_ufixed (arg'range);
begin
argslv := to_uns (arg);
argslv := argslv sll COUNT;
result := to_fixed (argslv, result'high, result'low);
return result;
end function "sll";
function "srl" (ARG : UNRESOLVED_ufixed; COUNT : INTEGER)
return UNRESOLVED_ufixed
is
variable argslv : UNRESOLVED_UNSIGNED (arg'length-1 downto 0);
variable result : UNRESOLVED_ufixed (arg'range);
begin
argslv := to_uns (arg);
argslv := argslv srl COUNT;
result := to_fixed (argslv, result'high, result'low);
return result;
end function "srl";
function "rol" (ARG : UNRESOLVED_ufixed; COUNT : INTEGER)
return UNRESOLVED_ufixed
is
variable argslv : UNRESOLVED_UNSIGNED (arg'length-1 downto 0);
variable result : UNRESOLVED_ufixed (arg'range);
begin
argslv := to_uns (arg);
argslv := argslv rol COUNT;
result := to_fixed (argslv, result'high, result'low);
return result;
end function "rol";
function "ror" (ARG : UNRESOLVED_ufixed; COUNT : INTEGER)
return UNRESOLVED_ufixed
is
variable argslv : UNRESOLVED_UNSIGNED (arg'length-1 downto 0);
variable result : UNRESOLVED_ufixed (arg'range);
begin
argslv := to_uns (arg);
argslv := argslv ror COUNT;
result := to_fixed (argslv, result'high, result'low);
return result;
end function "ror";
function "sla" (ARG : UNRESOLVED_ufixed; COUNT : INTEGER)
return UNRESOLVED_ufixed
is
variable argslv : UNRESOLVED_UNSIGNED (arg'length-1 downto 0);
variable result : UNRESOLVED_ufixed (arg'range);
begin
argslv := to_uns (arg);
-- Arithmetic shift on an unsigned is a logical shift
argslv := argslv sll COUNT;
result := to_fixed (argslv, result'high, result'low);
return result;
end function "sla";
function "sra" (ARG : UNRESOLVED_ufixed; COUNT : INTEGER)
return UNRESOLVED_ufixed
is
variable argslv : UNRESOLVED_UNSIGNED (arg'length-1 downto 0);
variable result : UNRESOLVED_ufixed (arg'range);
begin
argslv := to_uns (arg);
-- Arithmetic shift on an unsigned is a logical shift
argslv := argslv srl COUNT;
result := to_fixed (argslv, result'high, result'low);
return result;
end function "sra";
function "sll" (ARG : UNRESOLVED_sfixed; COUNT : INTEGER)
return UNRESOLVED_sfixed
is
variable argslv : UNRESOLVED_SIGNED (arg'length-1 downto 0);
variable result : UNRESOLVED_sfixed (arg'range);
begin
argslv := to_s (arg);
argslv := argslv sll COUNT;
result := to_fixed (argslv, result'high, result'low);
return result;
end function "sll";
function "srl" (ARG : UNRESOLVED_sfixed; COUNT : INTEGER)
return UNRESOLVED_sfixed
is
variable argslv : UNRESOLVED_SIGNED (arg'length-1 downto 0);
variable result : UNRESOLVED_sfixed (arg'range);
begin
argslv := to_s (arg);
argslv := argslv srl COUNT;
result := to_fixed (argslv, result'high, result'low);
return result;
end function "srl";
function "rol" (ARG : UNRESOLVED_sfixed; COUNT : INTEGER)
return UNRESOLVED_sfixed
is
variable argslv : UNRESOLVED_SIGNED (arg'length-1 downto 0);
variable result : UNRESOLVED_sfixed (arg'range);
begin
argslv := to_s (arg);
argslv := argslv rol COUNT;
result := to_fixed (argslv, result'high, result'low);
return result;
end function "rol";
function "ror" (ARG : UNRESOLVED_sfixed; COUNT : INTEGER)
return UNRESOLVED_sfixed
is
variable argslv : UNRESOLVED_SIGNED (arg'length-1 downto 0);
variable result : UNRESOLVED_sfixed (arg'range);
begin
argslv := to_s (arg);
argslv := argslv ror COUNT;
result := to_fixed (argslv, result'high, result'low);
return result;
end function "ror";
function "sla" (ARG : UNRESOLVED_sfixed; COUNT : INTEGER)
return UNRESOLVED_sfixed
is
variable argslv : UNRESOLVED_SIGNED (arg'length-1 downto 0);
variable result : UNRESOLVED_sfixed (arg'range);
begin
argslv := to_s (arg);
if COUNT > 0 then
-- Arithmetic shift left on a 2's complement number is a logic shift
argslv := argslv sll COUNT;
else
argslv := argslv sra -COUNT;
end if;
result := to_fixed (argslv, result'high, result'low);
return result;
end function "sla";
function "sra" (ARG : UNRESOLVED_sfixed; COUNT : INTEGER)
return UNRESOLVED_sfixed
is
variable argslv : UNRESOLVED_SIGNED (arg'length-1 downto 0);
variable result : UNRESOLVED_sfixed (arg'range);
begin
argslv := to_s (arg);
if COUNT > 0 then
argslv := argslv sra COUNT;
else
-- Arithmetic shift left on a 2's complement number is a logic shift
argslv := argslv sll -COUNT;
end if;
result := to_fixed (argslv, result'high, result'low);
return result;
end function "sra";
-- Because some people want the older functions.
function SHIFT_LEFT (ARG : UNRESOLVED_ufixed; COUNT : NATURAL)
return UNRESOLVED_ufixed is
begin
if (ARG'length < 1) then
return NAUF;
end if;
return ARG sla COUNT;
end function SHIFT_LEFT;
function SHIFT_RIGHT (ARG : UNRESOLVED_ufixed; COUNT : NATURAL)
return UNRESOLVED_ufixed is
begin
if (ARG'length < 1) then
return NAUF;
end if;
return ARG sra COUNT;
end function SHIFT_RIGHT;
function SHIFT_LEFT (ARG : UNRESOLVED_sfixed; COUNT : NATURAL)
return UNRESOLVED_sfixed is
begin
if (ARG'length < 1) then
return NASF;
end if;
return ARG sla COUNT;
end function SHIFT_LEFT;
function SHIFT_RIGHT (ARG : UNRESOLVED_sfixed; COUNT : NATURAL)
return UNRESOLVED_sfixed is
begin
if (ARG'length < 1) then
return NASF;
end if;
return ARG sra COUNT;
end function SHIFT_RIGHT;
----------------------------------------------------------------------------
-- logical functions
----------------------------------------------------------------------------
function "not" (L : UNRESOLVED_ufixed) return UNRESOLVED_ufixed is
variable RESULT : STD_ULOGIC_VECTOR(L'length-1 downto 0); -- force downto
begin
RESULT := not to_sulv(L);
return to_ufixed(RESULT, L'high, L'low);
end function "not";
function "and" (L, R : UNRESOLVED_ufixed) return UNRESOLVED_ufixed is
variable RESULT : STD_ULOGIC_VECTOR(L'length-1 downto 0); -- force downto
begin
if (L'high = R'high and L'low = R'low) then
RESULT := to_sulv(L) and to_sulv(R);
else
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """and"": Range error L'RANGE /= R'RANGE"
severity warning;
RESULT := (others => 'X');
end if;
return to_ufixed(RESULT, L'high, L'low);
end function "and";
function "or" (L, R : UNRESOLVED_ufixed) return UNRESOLVED_ufixed is
variable RESULT : STD_ULOGIC_VECTOR(L'length-1 downto 0); -- force downto
begin
if (L'high = R'high and L'low = R'low) then
RESULT := to_sulv(L) or to_sulv(R);
else
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """or"": Range error L'RANGE /= R'RANGE"
severity warning;
RESULT := (others => 'X');
end if;
return to_ufixed(RESULT, L'high, L'low);
end function "or";
function "nand" (L, R : UNRESOLVED_ufixed) return UNRESOLVED_ufixed is
variable RESULT : STD_ULOGIC_VECTOR(L'length-1 downto 0); -- force downto
begin
if (L'high = R'high and L'low = R'low) then
RESULT := to_sulv(L) nand to_sulv(R);
else
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """nand"": Range error L'RANGE /= R'RANGE"
severity warning;
RESULT := (others => 'X');
end if;
return to_ufixed(RESULT, L'high, L'low);
end function "nand";
function "nor" (L, R : UNRESOLVED_ufixed) return UNRESOLVED_ufixed is
variable RESULT : STD_ULOGIC_VECTOR(L'length-1 downto 0); -- force downto
begin
if (L'high = R'high and L'low = R'low) then
RESULT := to_sulv(L) nor to_sulv(R);
else
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """nor"": Range error L'RANGE /= R'RANGE"
severity warning;
RESULT := (others => 'X');
end if;
return to_ufixed(RESULT, L'high, L'low);
end function "nor";
function "xor" (L, R : UNRESOLVED_ufixed) return UNRESOLVED_ufixed is
variable RESULT : STD_ULOGIC_VECTOR(L'length-1 downto 0); -- force downto
begin
if (L'high = R'high and L'low = R'low) then
RESULT := to_sulv(L) xor to_sulv(R);
else
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """xor"": Range error L'RANGE /= R'RANGE"
severity warning;
RESULT := (others => 'X');
end if;
return to_ufixed(RESULT, L'high, L'low);
end function "xor";
function "xnor" (L, R : UNRESOLVED_ufixed) return UNRESOLVED_ufixed is
variable RESULT : STD_ULOGIC_VECTOR(L'length-1 downto 0); -- force downto
begin
if (L'high = R'high and L'low = R'low) then
RESULT := to_sulv(L) xnor to_sulv(R);
else
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """xnor"": Range error L'RANGE /= R'RANGE"
severity warning;
RESULT := (others => 'X');
end if;
return to_ufixed(RESULT, L'high, L'low);
end function "xnor";
function "not" (L : UNRESOLVED_sfixed) return UNRESOLVED_sfixed is
variable RESULT : STD_ULOGIC_VECTOR(L'length-1 downto 0); -- force downto
begin
RESULT := not to_sulv(L);
return to_sfixed(RESULT, L'high, L'low);
end function "not";
function "and" (L, R : UNRESOLVED_sfixed) return UNRESOLVED_sfixed is
variable RESULT : STD_ULOGIC_VECTOR(L'length-1 downto 0); -- force downto
begin
if (L'high = R'high and L'low = R'low) then
RESULT := to_sulv(L) and to_sulv(R);
else
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """and"": Range error L'RANGE /= R'RANGE"
severity warning;
RESULT := (others => 'X');
end if;
return to_sfixed(RESULT, L'high, L'low);
end function "and";
function "or" (L, R : UNRESOLVED_sfixed) return UNRESOLVED_sfixed is
variable RESULT : STD_ULOGIC_VECTOR(L'length-1 downto 0); -- force downto
begin
if (L'high = R'high and L'low = R'low) then
RESULT := to_sulv(L) or to_sulv(R);
else
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """or"": Range error L'RANGE /= R'RANGE"
severity warning;
RESULT := (others => 'X');
end if;
return to_sfixed(RESULT, L'high, L'low);
end function "or";
function "nand" (L, R : UNRESOLVED_sfixed) return UNRESOLVED_sfixed is
variable RESULT : STD_ULOGIC_VECTOR(L'length-1 downto 0); -- force downto
begin
if (L'high = R'high and L'low = R'low) then
RESULT := to_sulv(L) nand to_sulv(R);
else
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """nand"": Range error L'RANGE /= R'RANGE"
severity warning;
RESULT := (others => 'X');
end if;
return to_sfixed(RESULT, L'high, L'low);
end function "nand";
function "nor" (L, R : UNRESOLVED_sfixed) return UNRESOLVED_sfixed is
variable RESULT : STD_ULOGIC_VECTOR(L'length-1 downto 0); -- force downto
begin
if (L'high = R'high and L'low = R'low) then
RESULT := to_sulv(L) nor to_sulv(R);
else
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """nor"": Range error L'RANGE /= R'RANGE"
severity warning;
RESULT := (others => 'X');
end if;
return to_sfixed(RESULT, L'high, L'low);
end function "nor";
function "xor" (L, R : UNRESOLVED_sfixed) return UNRESOLVED_sfixed is
variable RESULT : STD_ULOGIC_VECTOR(L'length-1 downto 0); -- force downto
begin
if (L'high = R'high and L'low = R'low) then
RESULT := to_sulv(L) xor to_sulv(R);
else
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """xor"": Range error L'RANGE /= R'RANGE"
severity warning;
RESULT := (others => 'X');
end if;
return to_sfixed(RESULT, L'high, L'low);
end function "xor";
function "xnor" (L, R : UNRESOLVED_sfixed) return UNRESOLVED_sfixed is
variable RESULT : STD_ULOGIC_VECTOR(L'length-1 downto 0); -- force downto
begin
if (L'high = R'high and L'low = R'low) then
RESULT := to_sulv(L) xnor to_sulv(R);
else
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """xnor"": Range error L'RANGE /= R'RANGE"
severity warning;
RESULT := (others => 'X');
end if;
return to_sfixed(RESULT, L'high, L'low);
end function "xnor";
-- Vector and std_ulogic functions, same as functions in numeric_std
function "and" (L : STD_ULOGIC; R : UNRESOLVED_ufixed)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (R'range);
begin
for i in result'range loop
result(i) := L and R(i);
end loop;
return result;
end function "and";
function "and" (L : UNRESOLVED_ufixed; R : STD_ULOGIC)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (L'range);
begin
for i in result'range loop
result(i) := L(i) and R;
end loop;
return result;
end function "and";
function "or" (L : STD_ULOGIC; R : UNRESOLVED_ufixed)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (R'range);
begin
for i in result'range loop
result(i) := L or R(i);
end loop;
return result;
end function "or";
function "or" (L : UNRESOLVED_ufixed; R : STD_ULOGIC)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (L'range);
begin
for i in result'range loop
result(i) := L(i) or R;
end loop;
return result;
end function "or";
function "nand" (L : STD_ULOGIC; R : UNRESOLVED_ufixed)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (R'range);
begin
for i in result'range loop
result(i) := L nand R(i);
end loop;
return result;
end function "nand";
function "nand" (L : UNRESOLVED_ufixed; R : STD_ULOGIC)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (L'range);
begin
for i in result'range loop
result(i) := L(i) nand R;
end loop;
return result;
end function "nand";
function "nor" (L : STD_ULOGIC; R : UNRESOLVED_ufixed)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (R'range);
begin
for i in result'range loop
result(i) := L nor R(i);
end loop;
return result;
end function "nor";
function "nor" (L : UNRESOLVED_ufixed; R : STD_ULOGIC)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (L'range);
begin
for i in result'range loop
result(i) := L(i) nor R;
end loop;
return result;
end function "nor";
function "xor" (L : STD_ULOGIC; R : UNRESOLVED_ufixed)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (R'range);
begin
for i in result'range loop
result(i) := L xor R(i);
end loop;
return result;
end function "xor";
function "xor" (L : UNRESOLVED_ufixed; R : STD_ULOGIC)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (L'range);
begin
for i in result'range loop
result(i) := L(i) xor R;
end loop;
return result;
end function "xor";
function "xnor" (L : STD_ULOGIC; R : UNRESOLVED_ufixed)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (R'range);
begin
for i in result'range loop
result(i) := L xnor R(i);
end loop;
return result;
end function "xnor";
function "xnor" (L : UNRESOLVED_ufixed; R : STD_ULOGIC)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (L'range);
begin
for i in result'range loop
result(i) := L(i) xnor R;
end loop;
return result;
end function "xnor";
function "and" (L : STD_ULOGIC; R : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (R'range);
begin
for i in result'range loop
result(i) := L and R(i);
end loop;
return result;
end function "and";
function "and" (L : UNRESOLVED_sfixed; R : STD_ULOGIC)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (L'range);
begin
for i in result'range loop
result(i) := L(i) and R;
end loop;
return result;
end function "and";
function "or" (L : STD_ULOGIC; R : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (R'range);
begin
for i in result'range loop
result(i) := L or R(i);
end loop;
return result;
end function "or";
function "or" (L : UNRESOLVED_sfixed; R : STD_ULOGIC)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (L'range);
begin
for i in result'range loop
result(i) := L(i) or R;
end loop;
return result;
end function "or";
function "nand" (L : STD_ULOGIC; R : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (R'range);
begin
for i in result'range loop
result(i) := L nand R(i);
end loop;
return result;
end function "nand";
function "nand" (L : UNRESOLVED_sfixed; R : STD_ULOGIC)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (L'range);
begin
for i in result'range loop
result(i) := L(i) nand R;
end loop;
return result;
end function "nand";
function "nor" (L : STD_ULOGIC; R : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (R'range);
begin
for i in result'range loop
result(i) := L nor R(i);
end loop;
return result;
end function "nor";
function "nor" (L : UNRESOLVED_sfixed; R : STD_ULOGIC)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (L'range);
begin
for i in result'range loop
result(i) := L(i) nor R;
end loop;
return result;
end function "nor";
function "xor" (L : STD_ULOGIC; R : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (R'range);
begin
for i in result'range loop
result(i) := L xor R(i);
end loop;
return result;
end function "xor";
function "xor" (L : UNRESOLVED_sfixed; R : STD_ULOGIC)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (L'range);
begin
for i in result'range loop
result(i) := L(i) xor R;
end loop;
return result;
end function "xor";
function "xnor" (L : STD_ULOGIC; R : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (R'range);
begin
for i in result'range loop
result(i) := L xnor R(i);
end loop;
return result;
end function "xnor";
function "xnor" (L : UNRESOLVED_sfixed; R : STD_ULOGIC)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (L'range);
begin
for i in result'range loop
result(i) := L(i) xnor R;
end loop;
return result;
end function "xnor";
-- Reduction operators
function "and" (l : UNRESOLVED_ufixed) return STD_ULOGIC is
begin
return and to_sulv(l);
end function "and";
function "nand" (l : UNRESOLVED_ufixed) return STD_ULOGIC is
begin
return nand to_sulv(l);
end function "nand";
function "or" (l : UNRESOLVED_ufixed) return STD_ULOGIC is
begin
return or to_sulv(l);
end function "or";
function "nor" (l : UNRESOLVED_ufixed) return STD_ULOGIC is
begin
return nor to_sulv(l);
end function "nor";
function "xor" (l : UNRESOLVED_ufixed) return STD_ULOGIC is
begin
return xor to_sulv(l);
end function "xor";
function "xnor" (l : UNRESOLVED_ufixed) return STD_ULOGIC is
begin
return xnor to_sulv(l);
end function "xnor";
function "and" (l : UNRESOLVED_sfixed) return STD_ULOGIC is
begin
return and to_sulv(l);
end function "and";
function "nand" (l : UNRESOLVED_sfixed) return STD_ULOGIC is
begin
return nand to_sulv(l);
end function "nand";
function "or" (l : UNRESOLVED_sfixed) return STD_ULOGIC is
begin
return or to_sulv(l);
end function "or";
function "nor" (l : UNRESOLVED_sfixed) return STD_ULOGIC is
begin
return nor to_sulv(l);
end function "nor";
function "xor" (l : UNRESOLVED_sfixed) return STD_ULOGIC is
begin
return xor to_sulv(l);
end function "xor";
function "xnor" (l : UNRESOLVED_sfixed) return STD_ULOGIC is
begin
return xnor to_sulv(l);
end function "xnor";
-- End reduction operators
function "?=" (L, R : UNRESOLVED_ufixed) return STD_ULOGIC is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_UNSIGNED (lresize'length-1 downto 0);
begin -- ?=
if ((L'length < 1) or (R'length < 1)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """?="": null detected, returning X"
severity warning;
return 'X';
else
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_uns (lresize);
rslv := to_uns (rresize);
return lslv ?= rslv;
end if;
end function "?=";
function "?/=" (L, R : UNRESOLVED_ufixed) return STD_ULOGIC is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_UNSIGNED (lresize'length-1 downto 0);
begin -- ?/=
if ((L'length < 1) or (R'length < 1)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """?/="": null detected, returning X"
severity warning;
return 'X';
else
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_uns (lresize);
rslv := to_uns (rresize);
return lslv ?/= rslv;
end if;
end function "?/=";
function "?>" (L, R : UNRESOLVED_ufixed) return STD_ULOGIC is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_UNSIGNED (lresize'length-1 downto 0);
begin -- ?>
if ((l'length < 1) or (r'length < 1)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """?>"": null detected, returning X"
severity warning;
return 'X';
else
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_uns (lresize);
rslv := to_uns (rresize);
return lslv ?> rslv;
end if;
end function "?>";
function "?>=" (L, R : UNRESOLVED_ufixed) return STD_ULOGIC is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_UNSIGNED (lresize'length-1 downto 0);
begin -- ?>=
if ((l'length < 1) or (r'length < 1)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """?>="": null detected, returning X"
severity warning;
return 'X';
else
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_uns (lresize);
rslv := to_uns (rresize);
return lslv ?>= rslv;
end if;
end function "?>=";
function "?<" (L, R : UNRESOLVED_ufixed) return STD_ULOGIC is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_UNSIGNED (lresize'length-1 downto 0);
begin -- ?<
if ((l'length < 1) or (r'length < 1)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """?<"": null detected, returning X"
severity warning;
return 'X';
else
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_uns (lresize);
rslv := to_uns (rresize);
return lslv ?< rslv;
end if;
end function "?<";
function "?<=" (L, R : UNRESOLVED_ufixed) return STD_ULOGIC is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_UNSIGNED (lresize'length-1 downto 0);
begin -- ?<=
if ((l'length < 1) or (r'length < 1)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """?<="": null detected, returning X"
severity warning;
return 'X';
else
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_uns (lresize);
rslv := to_uns (rresize);
return lslv ?<= rslv;
end if;
end function "?<=";
function "?=" (L, R : UNRESOLVED_sfixed) return STD_ULOGIC is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_SIGNED (lresize'length-1 downto 0);
begin -- ?=
if ((L'length < 1) or (R'length < 1)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """?="": null detected, returning X"
severity warning;
return 'X';
else
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_s (lresize);
rslv := to_s (rresize);
return lslv ?= rslv;
end if;
end function "?=";
function "?/=" (L, R : UNRESOLVED_sfixed) return STD_ULOGIC is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_SIGNED (lresize'length-1 downto 0);
begin -- ?/=
if ((L'length < 1) or (R'length < 1)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """?/="": null detected, returning X"
severity warning;
return 'X';
else
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_s (lresize);
rslv := to_s (rresize);
return lslv ?/= rslv;
end if;
end function "?/=";
function "?>" (L, R : UNRESOLVED_sfixed) return STD_ULOGIC is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_SIGNED (lresize'length-1 downto 0);
begin -- ?>
if ((l'length < 1) or (r'length < 1)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """?>"": null detected, returning X"
severity warning;
return 'X';
else
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_s (lresize);
rslv := to_s (rresize);
return lslv ?> rslv;
end if;
end function "?>";
function "?>=" (L, R : UNRESOLVED_sfixed) return STD_ULOGIC is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_SIGNED (lresize'length-1 downto 0);
begin -- ?>=
if ((l'length < 1) or (r'length < 1)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """?>="": null detected, returning X"
severity warning;
return 'X';
else
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_s (lresize);
rslv := to_s (rresize);
return lslv ?>= rslv;
end if;
end function "?>=";
function "?<" (L, R : UNRESOLVED_sfixed) return STD_ULOGIC is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_SIGNED (lresize'length-1 downto 0);
begin -- ?<
if ((l'length < 1) or (r'length < 1)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """?<"": null detected, returning X"
severity warning;
return 'X';
else
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_s (lresize);
rslv := to_s (rresize);
return lslv ?< rslv;
end if;
end function "?<";
function "?<=" (L, R : UNRESOLVED_sfixed) return STD_ULOGIC is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_SIGNED (lresize'length-1 downto 0);
begin -- ?<=
if ((l'length < 1) or (r'length < 1)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """?<="": null detected, returning X"
severity warning;
return 'X';
else
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_s (lresize);
rslv := to_s (rresize);
return lslv ?<= rslv;
end if;
end function "?<=";
-- Match function, similar to "std_match" from numeric_std
function std_match (L, R : UNRESOLVED_ufixed) return BOOLEAN is
begin
if (L'high = R'high and L'low = R'low) then
return std_match(to_sulv(L), to_sulv(R));
else
assert NO_WARNING
report fixed_generic_pkg'instance_name
& "STD_MATCH: L'RANGE /= R'RANGE, returning FALSE"
severity warning;
return false;
end if;
end function std_match;
function std_match (L, R : UNRESOLVED_sfixed) return BOOLEAN is
begin
if (L'high = R'high and L'low = R'low) then
return std_match(to_sulv(L), to_sulv(R));
else
assert NO_WARNING
report fixed_generic_pkg'instance_name
& "STD_MATCH: L'RANGE /= R'RANGE, returning FALSE"
severity warning;
return false;
end if;
end function std_match;
-- compare functions
function "=" (
l, r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN
is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_UNSIGNED (lresize'length-1 downto 0);
begin
if (l'length < 1 or r'length < 1) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """="": null argument detected, returning FALSE"
severity warning;
return false;
elsif (Is_X(l) or Is_X(r)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """="": metavalue detected, returning FALSE"
severity warning;
return false;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_uns (lresize);
rslv := to_uns (rresize);
return lslv = rslv;
end function "=";
function "=" (
l, r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN
is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_SIGNED (lresize'length-1 downto 0);
begin
if (l'length < 1 or r'length < 1) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """="": null argument detected, returning FALSE"
severity warning;
return false;
elsif (Is_X(l) or Is_X(r)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """="": metavalue detected, returning FALSE"
severity warning;
return false;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_s (lresize);
rslv := to_s (rresize);
return lslv = rslv;
end function "=";
function "/=" (
l, r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN
is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_UNSIGNED (lresize'length-1 downto 0);
begin
if (l'length < 1 or r'length < 1) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """/="": null argument detected, returning TRUE"
severity warning;
return true;
elsif (Is_X(l) or Is_X(r)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """/="": metavalue detected, returning TRUE"
severity warning;
return true;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_uns (lresize);
rslv := to_uns (rresize);
return lslv /= rslv;
end function "/=";
function "/=" (
l, r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN
is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_SIGNED (lresize'length-1 downto 0);
begin
if (l'length < 1 or r'length < 1) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """/="": null argument detected, returning TRUE"
severity warning;
return true;
elsif (Is_X(l) or Is_X(r)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """/="": metavalue detected, returning TRUE"
severity warning;
return true;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_s (lresize);
rslv := to_s (rresize);
return lslv /= rslv;
end function "/=";
function ">" (
l, r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN
is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_UNSIGNED (lresize'length-1 downto 0);
begin
if (l'length < 1 or r'length < 1) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """>"": null argument detected, returning FALSE"
severity warning;
return false;
elsif (Is_X(l) or Is_X(r)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """>"": metavalue detected, returning FALSE"
severity warning;
return false;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_uns (lresize);
rslv := to_uns (rresize);
return lslv > rslv;
end function ">";
function ">" (
l, r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN
is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_SIGNED (lresize'length-1 downto 0);
begin
if (l'length < 1 or r'length < 1) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """>"": null argument detected, returning FALSE"
severity warning;
return false;
elsif (Is_X(l) or Is_X(r)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """>"": metavalue detected, returning FALSE"
severity warning;
return false;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_s (lresize);
rslv := to_s (rresize);
return lslv > rslv;
end function ">";
function "<" (
l, r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN
is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_UNSIGNED (lresize'length-1 downto 0);
begin
if (l'length < 1 or r'length < 1) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """<"": null argument detected, returning FALSE"
severity warning;
return false;
elsif (Is_X(l) or Is_X(r)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """<"": metavalue detected, returning FALSE"
severity warning;
return false;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_uns (lresize);
rslv := to_uns (rresize);
return lslv < rslv;
end function "<";
function "<" (
l, r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN
is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_SIGNED (lresize'length-1 downto 0);
begin
if (l'length < 1 or r'length < 1) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """<"": null argument detected, returning FALSE"
severity warning;
return false;
elsif (Is_X(l) or Is_X(r)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """<"": metavalue detected, returning FALSE"
severity warning;
return false;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_s (lresize);
rslv := to_s (rresize);
return lslv < rslv;
end function "<";
function ">=" (
l, r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN
is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_UNSIGNED (lresize'length-1 downto 0);
begin
if (l'length < 1 or r'length < 1) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """>="": null argument detected, returning FALSE"
severity warning;
return false;
elsif (Is_X(l) or Is_X(r)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """>="": metavalue detected, returning FALSE"
severity warning;
return false;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_uns (lresize);
rslv := to_uns (rresize);
return lslv >= rslv;
end function ">=";
function ">=" (
l, r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN
is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_SIGNED (lresize'length-1 downto 0);
begin
if (l'length < 1 or r'length < 1) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """>="": null argument detected, returning FALSE"
severity warning;
return false;
elsif (Is_X(l) or Is_X(r)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """>="": metavalue detected, returning FALSE"
severity warning;
return false;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_s (lresize);
rslv := to_s (rresize);
return lslv >= rslv;
end function ">=";
function "<=" (
l, r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN
is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_UNSIGNED (lresize'length-1 downto 0);
begin
if (l'length < 1 or r'length < 1) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """<="": null argument detected, returning FALSE"
severity warning;
return false;
elsif (Is_X(l) or Is_X(r)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """<="": metavalue detected, returning FALSE"
severity warning;
return false;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_uns (lresize);
rslv := to_uns (rresize);
return lslv <= rslv;
end function "<=";
function "<=" (
l, r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN
is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_SIGNED (lresize'length-1 downto 0);
begin
if (l'length < 1 or r'length < 1) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """<="": null argument detected, returning FALSE"
severity warning;
return false;
elsif (Is_X(l) or Is_X(r)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """<="": metavalue detected, returning FALSE"
severity warning;
return false;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_s (lresize);
rslv := to_s (rresize);
return lslv <= rslv;
end function "<=";
-- overloads of the default maximum and minimum functions
function maximum (l, r : UNRESOLVED_ufixed) return UNRESOLVED_ufixed is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
begin
if (l'length < 1 or r'length < 1) then
return NAUF;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
return to_fixed(maximum(to_uns(lresize), to_uns(rresize)),
left_index, right_index);
end function maximum;
function maximum (l, r : UNRESOLVED_sfixed) return UNRESOLVED_sfixed is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
begin
if (l'length < 1 or r'length < 1) then
return NASF;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
return to_fixed(maximum(to_s(lresize), to_s(rresize)),
left_index, right_index);
end function maximum;
function minimum (l, r : UNRESOLVED_ufixed) return UNRESOLVED_ufixed is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
begin
if (l'length < 1 or r'length < 1) then
return NAUF;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
return to_fixed(minimum(to_uns(lresize), to_uns(rresize)),
left_index, right_index);
end function minimum;
function minimum (l, r : UNRESOLVED_sfixed) return UNRESOLVED_sfixed is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
begin
if (l'length < 1 or r'length < 1) then
return NASF;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
return to_fixed(minimum(to_s(lresize), to_s(rresize)),
left_index, right_index);
end function minimum;
function to_ufixed (
arg : NATURAL; -- integer
constant left_index : INTEGER; -- left index (high index)
constant right_index : INTEGER := 0; -- right index
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_ufixed
is
constant fw : INTEGER := mins (right_index, right_index); -- catch literals
variable result : UNRESOLVED_ufixed (left_index downto fw);
variable sresult : UNRESOLVED_ufixed (left_index downto 0) :=
(others => '0'); -- integer portion
variable argx : NATURAL; -- internal version of arg
begin
if (result'length < 1) then
return NAUF;
end if;
if arg /= 0 then
argx := arg;
for I in 0 to sresult'left loop
if (argx mod 2) = 0 then
sresult(I) := '0';
else
sresult(I) := '1';
end if;
argx := argx/2;
end loop;
if argx /= 0 then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& "TO_UFIXED(NATURAL): vector truncated"
severity warning;
if overflow_style = fixed_saturate then
return saturate (left_index, right_index);
end if;
end if;
result := resize (arg => sresult,
left_index => left_index,
right_index => right_index,
round_style => round_style,
overflow_style => overflow_style);
else
result := (others => '0');
end if;
return result;
end function to_ufixed;
function to_sfixed (
arg : INTEGER; -- integer
constant left_index : INTEGER; -- left index (high index)
constant right_index : INTEGER := 0; -- right index
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_sfixed
is
constant fw : INTEGER := mins (right_index, right_index); -- catch literals
variable result : UNRESOLVED_sfixed (left_index downto fw);
variable sresult : UNRESOLVED_sfixed (left_index downto 0) :=
(others => '0'); -- integer portion
variable argx : INTEGER; -- internal version of arg
variable sign : STD_ULOGIC; -- sign of input
begin
if (result'length < 1) then -- null range
return NASF;
end if;
if arg /= 0 then
if (arg < 0) then
sign := '1';
argx := -(arg + 1);
else
sign := '0';
argx := arg;
end if;
for I in 0 to sresult'left loop
if (argx mod 2) = 0 then
sresult(I) := sign;
else
sresult(I) := not sign;
end if;
argx := argx/2;
end loop;
if argx /= 0 or left_index < 0 or sign /= sresult(sresult'left) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& "TO_SFIXED(INTEGER): vector truncated"
severity warning;
if overflow_style = fixed_saturate then -- saturate
if arg < 0 then
result := not saturate (result'high, result'low); -- underflow
else
result := saturate (result'high, result'low); -- overflow
end if;
return result;
end if;
end if;
result := resize (arg => sresult,
left_index => left_index,
right_index => right_index,
round_style => round_style,
overflow_style => overflow_style);
else
result := (others => '0');
end if;
return result;
end function to_sfixed;
function to_ufixed (
arg : REAL; -- real
constant left_index : INTEGER; -- left index (high index)
constant right_index : INTEGER; -- right index
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style;
constant guard_bits : NATURAL := fixed_guard_bits) -- # of guard bits
return UNRESOLVED_ufixed
is
constant fw : INTEGER := mins (right_index, right_index); -- catch literals
variable result : UNRESOLVED_ufixed (left_index downto fw) :=
(others => '0');
variable Xresult : UNRESOLVED_ufixed (left_index downto
fw-guard_bits) :=
(others => '0');
variable presult : REAL;
begin
-- If negative or null range, return.
if (left_index < fw) then
return NAUF;
end if;
if (arg < 0.0) then
report fixed_generic_pkg'instance_name
& "TO_UFIXED: Negative argument passed "
& REAL'image(arg) severity error;
return result;
end if;
presult := arg;
if presult >= (2.0**(left_index+1)) then
assert NO_WARNING report fixed_generic_pkg'instance_name
& "TO_UFIXED(REAL): vector truncated"
severity warning;
if overflow_style = fixed_wrap then
presult := presult mod (2.0**(left_index+1)); -- wrap
else
return saturate (result'high, result'low);
end if;
end if;
for i in Xresult'range loop
if presult >= 2.0**i then
Xresult(i) := '1';
presult := presult - 2.0**i;
else
Xresult(i) := '0';
end if;
end loop;
if guard_bits > 0 and round_style = fixed_round then
result := round_fixed (arg => Xresult (left_index
downto right_index),
remainder => Xresult (right_index-1 downto
right_index-guard_bits),
overflow_style => overflow_style);
else
result := Xresult (result'range);
end if;
return result;
end function to_ufixed;
function to_sfixed (
arg : REAL; -- real
constant left_index : INTEGER; -- left index (high index)
constant right_index : INTEGER; -- right index
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style;
constant guard_bits : NATURAL := fixed_guard_bits) -- # of guard bits
return UNRESOLVED_sfixed
is
constant fw : INTEGER := mins (right_index, right_index); -- catch literals
variable result : UNRESOLVED_sfixed (left_index downto fw) :=
(others => '0');
variable Xresult : UNRESOLVED_sfixed (left_index+1 downto fw-guard_bits) :=
(others => '0');
variable presult : REAL;
begin
if (left_index < fw) then -- null range
return NASF;
end if;
if (arg >= (2.0**left_index) or arg < -(2.0**left_index)) then
assert NO_WARNING report fixed_generic_pkg'instance_name
& "TO_SFIXED(REAL): vector truncated"
severity warning;
if overflow_style = fixed_saturate then
if arg < 0.0 then -- saturate
result := not saturate (result'high, result'low); -- underflow
else
result := saturate (result'high, result'low); -- overflow
end if;
return result;
else
presult := abs(arg) mod (2.0**(left_index+1)); -- wrap
end if;
else
presult := abs(arg);
end if;
for i in Xresult'range loop
if presult >= 2.0**i then
Xresult(i) := '1';
presult := presult - 2.0**i;
else
Xresult(i) := '0';
end if;
end loop;
if arg < 0.0 then
Xresult := to_fixed(-to_s(Xresult), Xresult'high, Xresult'low);
end if;
if guard_bits > 0 and round_style = fixed_round then
result := round_fixed (arg => Xresult (left_index
downto right_index),
remainder => Xresult (right_index-1 downto
right_index-guard_bits),
overflow_style => overflow_style);
else
result := Xresult (result'range);
end if;
return result;
end function to_sfixed;
function to_ufixed (
arg : UNRESOLVED_UNSIGNED; -- unsigned
constant left_index : INTEGER; -- left index (high index)
constant right_index : INTEGER := 0; -- right index
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_ufixed
is
constant ARG_LEFT : INTEGER := ARG'length-1;
alias XARG : UNRESOLVED_UNSIGNED(ARG_LEFT downto 0) is ARG;
variable result : UNRESOLVED_ufixed (left_index downto right_index);
begin
if arg'length < 1 or (left_index < right_index) then
return NAUF;
end if;
result := resize (arg => UNRESOLVED_ufixed (XARG),
left_index => left_index,
right_index => right_index,
round_style => round_style,
overflow_style => overflow_style);
return result;
end function to_ufixed;
-- converted version
function to_ufixed (
arg : UNRESOLVED_UNSIGNED) -- unsigned
return UNRESOLVED_ufixed
is
constant ARG_LEFT : INTEGER := ARG'length-1;
alias XARG : UNRESOLVED_UNSIGNED(ARG_LEFT downto 0) is ARG;
begin
if arg'length < 1 then
return NAUF;
end if;
return UNRESOLVED_ufixed(xarg);
end function to_ufixed;
function to_sfixed (
arg : UNRESOLVED_SIGNED; -- signed
constant left_index : INTEGER; -- left index (high index)
constant right_index : INTEGER := 0; -- right index
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_sfixed
is
constant ARG_LEFT : INTEGER := ARG'length-1;
alias XARG : UNRESOLVED_SIGNED(ARG_LEFT downto 0) is ARG;
variable result : UNRESOLVED_sfixed (left_index downto right_index);
begin
if arg'length < 1 or (left_index < right_index) then
return NASF;
end if;
result := resize (arg => UNRESOLVED_sfixed (XARG),
left_index => left_index,
right_index => right_index,
round_style => round_style,
overflow_style => overflow_style);
return result;
end function to_sfixed;
-- converted version
function to_sfixed (
arg : UNRESOLVED_SIGNED) -- signed
return UNRESOLVED_sfixed
is
constant ARG_LEFT : INTEGER := ARG'length-1;
alias XARG : UNRESOLVED_SIGNED(ARG_LEFT downto 0) is ARG;
begin
if arg'length < 1 then
return NASF;
end if;
return UNRESOLVED_sfixed(xarg);
end function to_sfixed;
function to_sfixed (arg : UNRESOLVED_ufixed) return UNRESOLVED_sfixed is
variable result : UNRESOLVED_sfixed (arg'high+1 downto arg'low);
begin
if arg'length < 1 then
return NASF;
end if;
result (arg'high downto arg'low) := UNRESOLVED_sfixed(cleanvec(arg));
result (arg'high+1) := '0';
return result;
end function to_sfixed;
-- Because of the fairly complicated sizing rules in the fixed point
-- packages these functions are provided to compute the result ranges
-- Example:
-- signal uf1 : ufixed (3 downto -3);
-- signal uf2 : ufixed (4 downto -2);
-- signal uf1multuf2 : ufixed (ufixed_high (3, -3, '*', 4, -2) downto
-- ufixed_low (3, -3, '*', 4, -2));
-- uf1multuf2 <= uf1 * uf2;
-- Valid characters: '+', '-', '*', '/', 'r' or 'R' (rem), 'm' or 'M' (mod),
-- '1' (reciprocal), 'A', 'a' (abs), 'N', 'n' (-sfixed)
function ufixed_high (left_index, right_index : INTEGER;
operation : CHARACTER := 'X';
left_index2, right_index2 : INTEGER := 0)
return INTEGER is
begin
case operation is
when '+'| '-' => return maximum (left_index, left_index2) + 1;
when '*' => return left_index + left_index2 + 1;
when '/' => return left_index - right_index2;
when '1' => return -right_index; -- reciprocal
when 'R'|'r' => return mins (left_index, left_index2); -- "rem"
when 'M'|'m' => return mins (left_index, left_index2); -- "mod"
when others => return left_index; -- For abs and default
end case;
end function ufixed_high;
function ufixed_low (left_index, right_index : INTEGER;
operation : CHARACTER := 'X';
left_index2, right_index2 : INTEGER := 0)
return INTEGER is
begin
case operation is
when '+'| '-' => return mins (right_index, right_index2);
when '*' => return right_index + right_index2;
when '/' => return right_index - left_index2 - 1;
when '1' => return -left_index - 1; -- reciprocal
when 'R'|'r' => return mins (right_index, right_index2); -- "rem"
when 'M'|'m' => return mins (right_index, right_index2); -- "mod"
when others => return right_index; -- for abs and default
end case;
end function ufixed_low;
function sfixed_high (left_index, right_index : INTEGER;
operation : CHARACTER := 'X';
left_index2, right_index2 : INTEGER := 0)
return INTEGER is
begin
case operation is
when '+'| '-' => return maximum (left_index, left_index2) + 1;
when '*' => return left_index + left_index2 + 1;
when '/' => return left_index - right_index2 + 1;
when '1' => return -right_index + 1; -- reciprocal
when 'R'|'r' => return mins (left_index, left_index2); -- "rem"
when 'M'|'m' => return left_index2; -- "mod"
when 'A'|'a' => return left_index + 1; -- "abs"
when 'N'|'n' => return left_index + 1; -- -sfixed
when others => return left_index;
end case;
end function sfixed_high;
function sfixed_low (left_index, right_index : INTEGER;
operation : CHARACTER := 'X';
left_index2, right_index2 : INTEGER := 0)
return INTEGER is
begin
case operation is
when '+'| '-' => return mins (right_index, right_index2);
when '*' => return right_index + right_index2;
when '/' => return right_index - left_index2;
when '1' => return -left_index; -- reciprocal
when 'R'|'r' => return mins (right_index, right_index2); -- "rem"
when 'M'|'m' => return mins (right_index, right_index2); -- "mod"
when others => return right_index; -- default for abs, neg and default
end case;
end function sfixed_low;
-- Same as above, but using the "size_res" input only for their ranges:
-- signal uf1multuf2 : ufixed (ufixed_high (uf1, '*', uf2) downto
-- ufixed_low (uf1, '*', uf2));
-- uf1multuf2 <= uf1 * uf2;
function ufixed_high (size_res : UNRESOLVED_ufixed;
operation : CHARACTER := 'X';
size_res2 : UNRESOLVED_ufixed)
return INTEGER is
begin
return ufixed_high (left_index => size_res'high,
right_index => size_res'low,
operation => operation,
left_index2 => size_res2'high,
right_index2 => size_res2'low);
end function ufixed_high;
function ufixed_low (size_res : UNRESOLVED_ufixed;
operation : CHARACTER := 'X';
size_res2 : UNRESOLVED_ufixed)
return INTEGER is
begin
return ufixed_low (left_index => size_res'high,
right_index => size_res'low,
operation => operation,
left_index2 => size_res2'high,
right_index2 => size_res2'low);
end function ufixed_low;
function sfixed_high (size_res : UNRESOLVED_sfixed;
operation : CHARACTER := 'X';
size_res2 : UNRESOLVED_sfixed)
return INTEGER is
begin
return sfixed_high (left_index => size_res'high,
right_index => size_res'low,
operation => operation,
left_index2 => size_res2'high,
right_index2 => size_res2'low);
end function sfixed_high;
function sfixed_low (size_res : UNRESOLVED_sfixed;
operation : CHARACTER := 'X';
size_res2 : UNRESOLVED_sfixed)
return INTEGER is
begin
return sfixed_low (left_index => size_res'high,
right_index => size_res'low,
operation => operation,
left_index2 => size_res2'high,
right_index2 => size_res2'low);
end function sfixed_low;
-- purpose: returns a saturated number
function saturate (
constant left_index : INTEGER;
constant right_index : INTEGER)
return UNRESOLVED_ufixed
is
constant sat : UNRESOLVED_ufixed (left_index downto right_index) :=
(others => '1');
begin
return sat;
end function saturate;
-- purpose: returns a saturated number
function saturate (
constant left_index : INTEGER;
constant right_index : INTEGER)
return UNRESOLVED_sfixed
is
variable sat : UNRESOLVED_sfixed (left_index downto right_index) :=
(others => '1');
begin
-- saturate positive, to saturate negative, just do "not saturate()"
sat (left_index) := '0';
return sat;
end function saturate;
function saturate (
size_res : UNRESOLVED_ufixed) -- only the size of this is used
return UNRESOLVED_ufixed is
begin
return saturate (size_res'high, size_res'low);
end function saturate;
function saturate (
size_res : UNRESOLVED_sfixed) -- only the size of this is used
return UNRESOLVED_sfixed is
begin
return saturate (size_res'high, size_res'low);
end function saturate;
-- As a concession to those who use a graphical DSP environment,
-- these functions take parameters in those tools format and create
-- fixed point numbers. These functions are designed to convert from
-- a std_logic_vector to the VHDL fixed point format using the conventions
-- of these packages. In a pure VHDL environment you should use the
-- "to_ufixed" and "to_sfixed" routines.
-- Unsigned fixed point
function to_UFix (
arg : STD_ULOGIC_VECTOR;
width : NATURAL; -- width of vector
fraction : NATURAL) -- width of fraction
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (width-fraction-1 downto -fraction);
begin
if (arg'length /= result'length) then
report fixed_generic_pkg'instance_name
& "TO_UFIX (STD_ULOGIC_VECTOR) "
& "Vector lengths do not match. Input length is "
& INTEGER'image(arg'length) & " and output will be "
& INTEGER'image(result'length) & " wide."
severity error;
return NAUF;
else
result := to_ufixed (arg, result'high, result'low);
return result;
end if;
end function to_UFix;
-- signed fixed point
function to_SFix (
arg : STD_ULOGIC_VECTOR;
width : NATURAL; -- width of vector
fraction : NATURAL) -- width of fraction
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (width-fraction-1 downto -fraction);
begin
if (arg'length /= result'length) then
report fixed_generic_pkg'instance_name
& "TO_SFIX (STD_ULOGIC_VECTOR) "
& "Vector lengths do not match. Input length is "
& INTEGER'image(arg'length) & " and output will be "
& INTEGER'image(result'length) & " wide."
severity error;
return NASF;
else
result := to_sfixed (arg, result'high, result'low);
return result;
end if;
end function to_SFix;
-- finding the bounds of a number. These functions can be used like this:
-- signal xxx : ufixed (7 downto -3);
-- -- Which is the same as "ufixed (UFix_high (11,3) downto UFix_low(11,3))"
-- signal yyy : ufixed (UFix_high (11, 3, "+", 11, 3)
-- downto UFix_low(11, 3, "+", 11, 3));
-- Where "11" is the width of xxx (xxx'length),
-- and 3 is the lower bound (abs (xxx'low))
-- In a pure VHDL environment use "ufixed_high" and "ufixed_low"
function ufix_high (
width, fraction : NATURAL;
operation : CHARACTER := 'X';
width2, fraction2 : NATURAL := 0)
return INTEGER is
begin
return ufixed_high (left_index => width - 1 - fraction,
right_index => -fraction,
operation => operation,
left_index2 => width2 - 1 - fraction2,
right_index2 => -fraction2);
end function ufix_high;
function ufix_low (
width, fraction : NATURAL;
operation : CHARACTER := 'X';
width2, fraction2 : NATURAL := 0)
return INTEGER is
begin
return ufixed_low (left_index => width - 1 - fraction,
right_index => -fraction,
operation => operation,
left_index2 => width2 - 1 - fraction2,
right_index2 => -fraction2);
end function ufix_low;
function sfix_high (
width, fraction : NATURAL;
operation : CHARACTER := 'X';
width2, fraction2 : NATURAL := 0)
return INTEGER is
begin
return sfixed_high (left_index => width - fraction,
right_index => -fraction,
operation => operation,
left_index2 => width2 - fraction2,
right_index2 => -fraction2);
end function sfix_high;
function sfix_low (
width, fraction : NATURAL;
operation : CHARACTER := 'X';
width2, fraction2 : NATURAL := 0)
return INTEGER is
begin
return sfixed_low (left_index => width - fraction,
right_index => -fraction,
operation => operation,
left_index2 => width2 - fraction2,
right_index2 => -fraction2);
end function sfix_low;
function to_unsigned (
arg : UNRESOLVED_ufixed; -- ufixed point input
constant size : NATURAL; -- length of output
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_UNSIGNED is
begin
return to_uns(resize (arg => arg,
left_index => size-1,
right_index => 0,
round_style => round_style,
overflow_style => overflow_style));
end function to_unsigned;
function to_unsigned (
arg : UNRESOLVED_ufixed; -- ufixed point input
size_res : UNRESOLVED_UNSIGNED; -- length of output
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_UNSIGNED is
begin
return to_unsigned (arg => arg,
size => size_res'length,
round_style => round_style,
overflow_style => overflow_style);
end function to_unsigned;
function to_signed (
arg : UNRESOLVED_sfixed; -- sfixed point input
constant size : NATURAL; -- length of output
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_SIGNED is
begin
return to_s(resize (arg => arg,
left_index => size-1,
right_index => 0,
round_style => round_style,
overflow_style => overflow_style));
end function to_signed;
function to_signed (
arg : UNRESOLVED_sfixed; -- sfixed point input
size_res : UNRESOLVED_SIGNED; -- used for length of output
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_SIGNED is
begin
return to_signed (arg => arg,
size => size_res'length,
round_style => round_style,
overflow_style => overflow_style);
end function to_signed;
function to_real (
arg : UNRESOLVED_ufixed) -- ufixed point input
return REAL
is
constant left_index : INTEGER := arg'high;
constant right_index : INTEGER := arg'low;
variable result : REAL; -- result
variable arg_int : UNRESOLVED_ufixed (left_index downto right_index);
begin
if (arg'length < 1) then
return 0.0;
end if;
arg_int := to_x01(cleanvec(arg));
if (Is_X(arg_int)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& "TO_REAL (ufixed): metavalue detected, returning 0.0"
severity warning;
return 0.0;
end if;
result := 0.0;
for i in arg_int'range loop
if (arg_int(i) = '1') then
result := result + (2.0**i);
end if;
end loop;
return result;
end function to_real;
function to_real (
arg : UNRESOLVED_sfixed) -- ufixed point input
return REAL
is
constant left_index : INTEGER := arg'high;
constant right_index : INTEGER := arg'low;
variable result : REAL; -- result
variable arg_int : UNRESOLVED_sfixed (left_index downto right_index);
-- unsigned version of argument
variable arg_uns : UNRESOLVED_ufixed (left_index downto right_index);
-- absolute of argument
begin
if (arg'length < 1) then
return 0.0;
end if;
arg_int := to_x01(cleanvec(arg));
if (Is_X(arg_int)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& "TO_REAL (sfixed): metavalue detected, returning 0.0"
severity warning;
return 0.0;
end if;
arg_uns := to_ufixed (arg_int);
result := to_real (arg_uns);
if (arg_int(arg_int'high) = '1') then
result := -result;
end if;
return result;
end function to_real;
function to_integer (
arg : UNRESOLVED_ufixed; -- fixed point input
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return NATURAL
is
constant left_index : INTEGER := arg'high;
variable arg_uns : UNRESOLVED_UNSIGNED (left_index+1 downto 0)
:= (others => '0');
begin
if (arg'length < 1) then
return 0;
end if;
if (Is_X (arg)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& "TO_INTEGER (ufixed): metavalue detected, returning 0"
severity warning;
return 0;
end if;
if (left_index < -1) then
return 0;
end if;
arg_uns := to_uns(resize (arg => arg,
left_index => arg_uns'high,
right_index => 0,
round_style => round_style,
overflow_style => overflow_style));
return to_integer (arg_uns);
end function to_integer;
function to_integer (
arg : UNRESOLVED_sfixed; -- fixed point input
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return INTEGER
is
constant left_index : INTEGER := arg'high;
constant right_index : INTEGER := arg'low;
variable arg_s : UNRESOLVED_SIGNED (left_index+1 downto 0);
begin
if (arg'length < 1) then
return 0;
end if;
if (Is_X (arg)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& "TO_INTEGER (sfixed): metavalue detected, returning 0"
severity warning;
return 0;
end if;
if (left_index < -1) then
return 0;
end if;
arg_s := to_s(resize (arg => arg,
left_index => arg_s'high,
right_index => 0,
round_style => round_style,
overflow_style => overflow_style));
return to_integer (arg_s);
end function to_integer;
function to_01 (
s : UNRESOLVED_ufixed; -- ufixed point input
constant XMAP : STD_ULOGIC := '0') -- Map x to
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (s'range); -- result
begin
if (s'length < 1) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& "TO_01(ufixed): null detected, returning NULL"
severity warning;
return NAUF;
end if;
return to_fixed (to_01(to_uns(s), XMAP), s'high, s'low);
end function to_01;
function to_01 (
s : UNRESOLVED_sfixed; -- sfixed point input
constant XMAP : STD_ULOGIC := '0') -- Map x to
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (s'range);
begin
if (s'length < 1) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& "TO_01(sfixed): null detected, returning NULL"
severity warning;
return NASF;
end if;
return to_fixed (to_01(to_s(s), XMAP), s'high, s'low);
end function to_01;
function Is_X (
arg : UNRESOLVED_ufixed)
return BOOLEAN
is
variable argslv : STD_ULOGIC_VECTOR (arg'length-1 downto 0); -- slv
begin
argslv := to_sulv(arg);
return Is_X (argslv);
end function Is_X;
function Is_X (
arg : UNRESOLVED_sfixed)
return BOOLEAN
is
variable argslv : STD_ULOGIC_VECTOR (arg'length-1 downto 0); -- slv
begin
argslv := to_sulv(arg);
return Is_X (argslv);
end function Is_X;
function To_X01 (
arg : UNRESOLVED_ufixed)
return UNRESOLVED_ufixed is
begin
return to_ufixed (To_X01(to_sulv(arg)), arg'high, arg'low);
end function To_X01;
function to_X01 (
arg : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed is
begin
return to_sfixed (To_X01(to_sulv(arg)), arg'high, arg'low);
end function To_X01;
function To_X01Z (
arg : UNRESOLVED_ufixed)
return UNRESOLVED_ufixed is
begin
return to_ufixed (To_X01Z(to_sulv(arg)), arg'high, arg'low);
end function To_X01Z;
function to_X01Z (
arg : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed is
begin
return to_sfixed (To_X01Z(to_sulv(arg)), arg'high, arg'low);
end function To_X01Z;
function To_UX01 (
arg : UNRESOLVED_ufixed)
return UNRESOLVED_ufixed is
begin
return to_ufixed (To_UX01(to_sulv(arg)), arg'high, arg'low);
end function To_UX01;
function to_UX01 (
arg : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed is
begin
return to_sfixed (To_UX01(to_sulv(arg)), arg'high, arg'low);
end function To_UX01;
function resize (
arg : UNRESOLVED_ufixed; -- input
constant left_index : INTEGER; -- integer portion
constant right_index : INTEGER; -- size of fraction
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_ufixed
is
constant arghigh : INTEGER := maximum (arg'high, arg'low);
constant arglow : INTEGER := mine (arg'high, arg'low);
variable invec : UNRESOLVED_ufixed (arghigh downto arglow);
variable result : UNRESOLVED_ufixed(left_index downto right_index) :=
(others => '0');
variable needs_rounding : BOOLEAN := false;
begin -- resize
if (arg'length < 1) or (result'length < 1) then
return NAUF;
elsif (invec'length < 1) then
return result; -- string literal value
else
invec := cleanvec(arg);
if (right_index > arghigh) then -- return top zeros
needs_rounding := (round_style = fixed_round) and
(right_index = arghigh+1);
elsif (left_index < arglow) then -- return overflow
if (overflow_style = fixed_saturate) and
(or(to_sulv(invec)) = '1') then
result := saturate (result'high, result'low); -- saturate
end if;
elsif (arghigh > left_index) then
-- wrap or saturate?
if (overflow_style = fixed_saturate and
or (to_sulv(invec(arghigh downto left_index+1))) = '1')
then
result := saturate (result'high, result'low); -- saturate
else
if (arglow >= right_index) then
result (left_index downto arglow) :=
invec(left_index downto arglow);
else
result (left_index downto right_index) :=
invec (left_index downto right_index);
needs_rounding := (round_style = fixed_round); -- round
end if;
end if;
else -- arghigh <= integer width
if (arglow >= right_index) then
result (arghigh downto arglow) := invec;
else
result (arghigh downto right_index) :=
invec (arghigh downto right_index);
needs_rounding := (round_style = fixed_round); -- round
end if;
end if;
-- Round result
if needs_rounding then
result := round_fixed (arg => result,
remainder => invec (right_index-1
downto arglow),
overflow_style => overflow_style);
end if;
return result;
end if;
end function resize;
function resize (
arg : UNRESOLVED_sfixed; -- input
constant left_index : INTEGER; -- integer portion
constant right_index : INTEGER; -- size of fraction
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_sfixed
is
constant arghigh : INTEGER := maximum (arg'high, arg'low);
constant arglow : INTEGER := mine (arg'high, arg'low);
variable invec : UNRESOLVED_sfixed (arghigh downto arglow);
variable result : UNRESOLVED_sfixed(left_index downto right_index) :=
(others => '0');
variable reduced : STD_ULOGIC;
variable needs_rounding : BOOLEAN := false; -- rounding
begin -- resize
if (arg'length < 1) or (result'length < 1) then
return NASF;
elsif (invec'length < 1) then
return result; -- string literal value
else
invec := cleanvec(arg);
if (right_index > arghigh) then -- return top zeros
if (arg'low /= INTEGER'low) then -- check for a literal
result := (others => arg(arghigh)); -- sign extend
end if;
needs_rounding := (round_style = fixed_round) and
(right_index = arghigh+1);
elsif (left_index < arglow) then -- return overflow
if (overflow_style = fixed_saturate) then
reduced := or (to_sulv(invec));
if (reduced = '1') then
if (invec(arghigh) = '0') then
-- saturate POSITIVE
result := saturate (result'high, result'low);
else
-- saturate negative
result := not saturate (result'high, result'low);
end if;
-- else return 0 (input was 0)
end if;
-- else return 0 (wrap)
end if;
elsif (arghigh > left_index) then
if (invec(arghigh) = '0') then
reduced := or (to_sulv(invec(arghigh-1 downto
left_index)));
if overflow_style = fixed_saturate and reduced = '1' then
-- saturate positive
result := saturate (result'high, result'low);
else
if (right_index > arglow) then
result := invec (left_index downto right_index);
needs_rounding := (round_style = fixed_round);
else
result (left_index downto arglow) :=
invec (left_index downto arglow);
end if;
end if;
else
reduced := and (to_sulv(invec(arghigh-1 downto
left_index)));
if overflow_style = fixed_saturate and reduced = '0' then
result := not saturate (result'high, result'low);
else
if (right_index > arglow) then
result := invec (left_index downto right_index);
needs_rounding := (round_style = fixed_round);
else
result (left_index downto arglow) :=
invec (left_index downto arglow);
end if;
end if;
end if;
else -- arghigh <= integer width
if (arglow >= right_index) then
result (arghigh downto arglow) := invec;
else
result (arghigh downto right_index) :=
invec (arghigh downto right_index);
needs_rounding := (round_style = fixed_round); -- round
end if;
if (left_index > arghigh) then -- sign extend
result(left_index downto arghigh+1) := (others => invec(arghigh));
end if;
end if;
-- Round result
if (needs_rounding) then
result := round_fixed (arg => result,
remainder => invec (right_index-1
downto arglow),
overflow_style => overflow_style);
end if;
return result;
end if;
end function resize;
-- size_res functions
-- These functions compute the size from a passed variable named "size_res"
-- The only part of this variable used it it's size, it is never passed
-- to a lower level routine.
function to_ufixed (
arg : STD_ULOGIC_VECTOR; -- shifted vector
size_res : UNRESOLVED_ufixed) -- for size only
return UNRESOLVED_ufixed
is
constant fw : INTEGER := mine (size_res'low, size_res'low); -- catch literals
variable result : UNRESOLVED_ufixed (size_res'left downto fw);
begin
if (result'length < 1 or arg'length < 1) then
return NAUF;
else
result := to_ufixed (arg => arg,
left_index => size_res'high,
right_index => size_res'low);
return result;
end if;
end function to_ufixed;
function to_sfixed (
arg : STD_ULOGIC_VECTOR; -- shifted vector
size_res : UNRESOLVED_sfixed) -- for size only
return UNRESOLVED_sfixed
is
constant fw : INTEGER := mine (size_res'low, size_res'low); -- catch literals
variable result : UNRESOLVED_sfixed (size_res'left downto fw);
begin
if (result'length < 1 or arg'length < 1) then
return NASF;
else
result := to_sfixed (arg => arg,
left_index => size_res'high,
right_index => size_res'low);
return result;
end if;
end function to_sfixed;
function to_ufixed (
arg : NATURAL; -- integer
size_res : UNRESOLVED_ufixed; -- for size only
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_ufixed
is
constant fw : INTEGER := mine (size_res'low, size_res'low); -- catch literals
variable result : UNRESOLVED_ufixed (size_res'left downto fw);
begin
if (result'length < 1) then
return NAUF;
else
result := to_ufixed (arg => arg,
left_index => size_res'high,
right_index => size_res'low,
round_style => round_style,
overflow_style => overflow_style);
return result;
end if;
end function to_ufixed;
function to_sfixed (
arg : INTEGER; -- integer
size_res : UNRESOLVED_sfixed; -- for size only
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_sfixed
is
constant fw : INTEGER := mine (size_res'low, size_res'low); -- catch literals
variable result : UNRESOLVED_sfixed (size_res'left downto fw);
begin
if (result'length < 1) then
return NASF;
else
result := to_sfixed (arg => arg,
left_index => size_res'high,
right_index => size_res'low,
round_style => round_style,
overflow_style => overflow_style);
return result;
end if;
end function to_sfixed;
function to_ufixed (
arg : REAL; -- real
size_res : UNRESOLVED_ufixed; -- for size only
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style;
constant guard_bits : NATURAL := fixed_guard_bits) -- # of guard bits
return UNRESOLVED_ufixed
is
constant fw : INTEGER := mine (size_res'low, size_res'low); -- catch literals
variable result : UNRESOLVED_ufixed (size_res'left downto fw);
begin
if (result'length < 1) then
return NAUF;
else
result := to_ufixed (arg => arg,
left_index => size_res'high,
right_index => size_res'low,
guard_bits => guard_bits,
round_style => round_style,
overflow_style => overflow_style);
return result;
end if;
end function to_ufixed;
function to_sfixed (
arg : REAL; -- real
size_res : UNRESOLVED_sfixed; -- for size only
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style;
constant guard_bits : NATURAL := fixed_guard_bits) -- # of guard bits
return UNRESOLVED_sfixed
is
constant fw : INTEGER := mine (size_res'low, size_res'low); -- catch literals
variable result : UNRESOLVED_sfixed (size_res'left downto fw);
begin
if (result'length < 1) then
return NASF;
else
result := to_sfixed (arg => arg,
left_index => size_res'high,
right_index => size_res'low,
guard_bits => guard_bits,
round_style => round_style,
overflow_style => overflow_style);
return result;
end if;
end function to_sfixed;
function to_ufixed (
arg : UNRESOLVED_UNSIGNED; -- unsigned
size_res : UNRESOLVED_ufixed; -- for size only
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_ufixed
is
constant fw : INTEGER := mine (size_res'low, size_res'low); -- catch literals
variable result : UNRESOLVED_ufixed (size_res'left downto fw);
begin
if (result'length < 1 or arg'length < 1) then
return NAUF;
else
result := to_ufixed (arg => arg,
left_index => size_res'high,
right_index => size_res'low,
round_style => round_style,
overflow_style => overflow_style);
return result;
end if;
end function to_ufixed;
function to_sfixed (
arg : UNRESOLVED_SIGNED; -- signed
size_res : UNRESOLVED_sfixed; -- for size only
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_sfixed
is
constant fw : INTEGER := mine (size_res'low, size_res'low); -- catch literals
variable result : UNRESOLVED_sfixed (size_res'left downto fw);
begin
if (result'length < 1 or arg'length < 1) then
return NASF;
else
result := to_sfixed (arg => arg,
left_index => size_res'high,
right_index => size_res'low,
round_style => round_style,
overflow_style => overflow_style);
return result;
end if;
end function to_sfixed;
function resize (
arg : UNRESOLVED_ufixed; -- input
size_res : UNRESOLVED_ufixed; -- for size only
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_ufixed
is
constant fw : INTEGER := mine (size_res'low, size_res'low); -- catch literals
variable result : UNRESOLVED_ufixed (size_res'high downto fw);
begin
if (result'length < 1 or arg'length < 1) then
return NAUF;
else
result := resize (arg => arg,
left_index => size_res'high,
right_index => size_res'low,
round_style => round_style,
overflow_style => overflow_style);
return result;
end if;
end function resize;
function resize (
arg : UNRESOLVED_sfixed; -- input
size_res : UNRESOLVED_sfixed; -- for size only
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_sfixed
is
constant fw : INTEGER := mine (size_res'low, size_res'low); -- catch literals
variable result : UNRESOLVED_sfixed (size_res'high downto fw);
begin
if (result'length < 1 or arg'length < 1) then
return NASF;
else
result := resize (arg => arg,
left_index => size_res'high,
right_index => size_res'low,
round_style => round_style,
overflow_style => overflow_style);
return result;
end if;
end function resize;
-- Overloaded math functions for real
function "+" (
l : UNRESOLVED_ufixed; -- fixed point input
r : REAL)
return UNRESOLVED_ufixed is
begin
return (l + to_ufixed (r, l'high, l'low));
end function "+";
function "+" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return (to_ufixed (l, r'high, r'low) + r);
end function "+";
function "+" (
l : UNRESOLVED_sfixed; -- fixed point input
r : REAL)
return UNRESOLVED_sfixed is
begin
return (l + to_sfixed (r, l'high, l'low));
end function "+";
function "+" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed is
begin
return (to_sfixed (l, r'high, r'low) + r);
end function "+";
function "-" (
l : UNRESOLVED_ufixed; -- fixed point input
r : REAL)
return UNRESOLVED_ufixed is
begin
return (l - to_ufixed (r, l'high, l'low));
end function "-";
function "-" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return (to_ufixed (l, r'high, r'low) - r);
end function "-";
function "-" (
l : UNRESOLVED_sfixed; -- fixed point input
r : REAL)
return UNRESOLVED_sfixed is
begin
return (l - to_sfixed (r, l'high, l'low));
end function "-";
function "-" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed is
begin
return (to_sfixed (l, r'high, r'low) - r);
end function "-";
function "*" (
l : UNRESOLVED_ufixed; -- fixed point input
r : REAL)
return UNRESOLVED_ufixed is
begin
return (l * to_ufixed (r, l'high, l'low));
end function "*";
function "*" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return (to_ufixed (l, r'high, r'low) * r);
end function "*";
function "*" (
l : UNRESOLVED_sfixed; -- fixed point input
r : REAL)
return UNRESOLVED_sfixed is
begin
return (l * to_sfixed (r, l'high, l'low));
end function "*";
function "*" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed is
begin
return (to_sfixed (l, r'high, r'low) * r);
end function "*";
function "/" (
l : UNRESOLVED_ufixed; -- fixed point input
r : REAL)
return UNRESOLVED_ufixed is
begin
return (l / to_ufixed (r, l'high, l'low));
end function "/";
function "/" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return (to_ufixed (l, r'high, r'low) / r);
end function "/";
function "/" (
l : UNRESOLVED_sfixed; -- fixed point input
r : REAL)
return UNRESOLVED_sfixed is
begin
return (l / to_sfixed (r, l'high, l'low));
end function "/";
function "/" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed is
begin
return (to_sfixed (l, r'high, r'low) / r);
end function "/";
function "rem" (
l : UNRESOLVED_ufixed; -- fixed point input
r : REAL)
return UNRESOLVED_ufixed is
begin
return (l rem to_ufixed (r, l'high, l'low));
end function "rem";
function "rem" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return (to_ufixed (l, r'high, r'low) rem r);
end function "rem";
function "rem" (
l : UNRESOLVED_sfixed; -- fixed point input
r : REAL)
return UNRESOLVED_sfixed is
begin
return (l rem to_sfixed (r, l'high, l'low));
end function "rem";
function "rem" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed is
begin
return (to_sfixed (l, r'high, r'low) rem r);
end function "rem";
function "mod" (
l : UNRESOLVED_ufixed; -- fixed point input
r : REAL)
return UNRESOLVED_ufixed is
begin
return (l mod to_ufixed (r, l'high, l'low));
end function "mod";
function "mod" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return (to_ufixed (l, r'high, r'low) mod r);
end function "mod";
function "mod" (
l : UNRESOLVED_sfixed; -- fixed point input
r : REAL)
return UNRESOLVED_sfixed is
begin
return (l mod to_sfixed (r, l'high, l'low));
end function "mod";
function "mod" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed is
begin
return (to_sfixed (l, r'high, r'low) mod r);
end function "mod";
-- Overloaded math functions for integers
function "+" (
l : UNRESOLVED_ufixed; -- fixed point input
r : NATURAL)
return UNRESOLVED_ufixed is
begin
return (l + to_ufixed (r, l'high, 0));
end function "+";
function "+" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return (to_ufixed (l, r'high, 0) + r);
end function "+";
function "+" (
l : UNRESOLVED_sfixed; -- fixed point input
r : INTEGER)
return UNRESOLVED_sfixed is
begin
return (l + to_sfixed (r, l'high, 0));
end function "+";
function "+" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed is
begin
return (to_sfixed (l, r'high, 0) + r);
end function "+";
-- Overloaded functions
function "-" (
l : UNRESOLVED_ufixed; -- fixed point input
r : NATURAL)
return UNRESOLVED_ufixed is
begin
return (l - to_ufixed (r, l'high, 0));
end function "-";
function "-" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return (to_ufixed (l, r'high, 0) - r);
end function "-";
function "-" (
l : UNRESOLVED_sfixed; -- fixed point input
r : INTEGER)
return UNRESOLVED_sfixed is
begin
return (l - to_sfixed (r, l'high, 0));
end function "-";
function "-" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed is
begin
return (to_sfixed (l, r'high, 0) - r);
end function "-";
-- Overloaded functions
function "*" (
l : UNRESOLVED_ufixed; -- fixed point input
r : NATURAL)
return UNRESOLVED_ufixed is
begin
return (l * to_ufixed (r, l'high, 0));
end function "*";
function "*" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return (to_ufixed (l, r'high, 0) * r);
end function "*";
function "*" (
l : UNRESOLVED_sfixed; -- fixed point input
r : INTEGER)
return UNRESOLVED_sfixed is
begin
return (l * to_sfixed (r, l'high, 0));
end function "*";
function "*" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed is
begin
return (to_sfixed (l, r'high, 0) * r);
end function "*";
-- Overloaded functions
function "/" (
l : UNRESOLVED_ufixed; -- fixed point input
r : NATURAL)
return UNRESOLVED_ufixed is
begin
return (l / to_ufixed (r, l'high, 0));
end function "/";
function "/" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return (to_ufixed (l, r'high, 0) / r);
end function "/";
function "/" (
l : UNRESOLVED_sfixed; -- fixed point input
r : INTEGER)
return UNRESOLVED_sfixed is
begin
return (l / to_sfixed (r, l'high, 0));
end function "/";
function "/" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed is
begin
return (to_sfixed (l, r'high, 0) / r);
end function "/";
function "rem" (
l : UNRESOLVED_ufixed; -- fixed point input
r : NATURAL)
return UNRESOLVED_ufixed is
begin
return (l rem to_ufixed (r, l'high, 0));
end function "rem";
function "rem" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return (to_ufixed (l, r'high, 0) rem r);
end function "rem";
function "rem" (
l : UNRESOLVED_sfixed; -- fixed point input
r : INTEGER)
return UNRESOLVED_sfixed is
begin
return (l rem to_sfixed (r, l'high, 0));
end function "rem";
function "rem" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed is
begin
return (to_sfixed (l, r'high, 0) rem r);
end function "rem";
function "mod" (
l : UNRESOLVED_ufixed; -- fixed point input
r : NATURAL)
return UNRESOLVED_ufixed is
begin
return (l mod to_ufixed (r, l'high, 0));
end function "mod";
function "mod" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return (to_ufixed (l, r'high, 0) mod r);
end function "mod";
function "mod" (
l : UNRESOLVED_sfixed; -- fixed point input
r : INTEGER)
return UNRESOLVED_sfixed is
begin
return (l mod to_sfixed (r, l'high, 0));
end function "mod";
function "mod" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed is
begin
return (to_sfixed (l, r'high, 0) mod r);
end function "mod";
-- overloaded ufixed compare functions with integer
function "=" (
l : UNRESOLVED_ufixed;
r : NATURAL) -- fixed point input
return BOOLEAN is
begin
return (l = to_ufixed (r, l'high, l'low));
end function "=";
function "/=" (
l : UNRESOLVED_ufixed;
r : NATURAL) -- fixed point input
return BOOLEAN is
begin
return (l /= to_ufixed (r, l'high, l'low));
end function "/=";
function ">=" (
l : UNRESOLVED_ufixed;
r : NATURAL) -- fixed point input
return BOOLEAN is
begin
return (l >= to_ufixed (r, l'high, l'low));
end function ">=";
function "<=" (
l : UNRESOLVED_ufixed;
r : NATURAL) -- fixed point input
return BOOLEAN is
begin
return (l <= to_ufixed (r, l'high, l'low));
end function "<=";
function ">" (
l : UNRESOLVED_ufixed;
r : NATURAL) -- fixed point input
return BOOLEAN is
begin
return (l > to_ufixed (r, l'high, l'low));
end function ">";
function "<" (
l : UNRESOLVED_ufixed;
r : NATURAL) -- fixed point input
return BOOLEAN is
begin
return (l < to_ufixed (r, l'high, l'low));
end function "<";
function "?=" (
l : UNRESOLVED_ufixed;
r : NATURAL) -- fixed point input
return STD_ULOGIC is
begin
return (l ?= to_ufixed (r, l'high, l'low));
end function "?=";
function "?/=" (
l : UNRESOLVED_ufixed;
r : NATURAL) -- fixed point input
return STD_ULOGIC is
begin
return (l ?/= to_ufixed (r, l'high, l'low));
end function "?/=";
function "?>=" (
l : UNRESOLVED_ufixed;
r : NATURAL) -- fixed point input
return STD_ULOGIC is
begin
return (l ?>= to_ufixed (r, l'high, l'low));
end function "?>=";
function "?<=" (
l : UNRESOLVED_ufixed;
r : NATURAL) -- fixed point input
return STD_ULOGIC is
begin
return (l ?<= to_ufixed (r, l'high, l'low));
end function "?<=";
function "?>" (
l : UNRESOLVED_ufixed;
r : NATURAL) -- fixed point input
return STD_ULOGIC is
begin
return (l ?> to_ufixed (r, l'high, l'low));
end function "?>";
function "?<" (
l : UNRESOLVED_ufixed;
r : NATURAL) -- fixed point input
return STD_ULOGIC is
begin
return (l ?< to_ufixed (r, l'high, l'low));
end function "?<";
function maximum (
l : UNRESOLVED_ufixed; -- fixed point input
r : NATURAL)
return UNRESOLVED_ufixed is
begin
return maximum (l, to_ufixed (r, l'high, l'low));
end function maximum;
function minimum (
l : UNRESOLVED_ufixed; -- fixed point input
r : NATURAL)
return UNRESOLVED_ufixed is
begin
return minimum (l, to_ufixed (r, l'high, l'low));
end function minimum;
-- NATURAL to ufixed
function "=" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN is
begin
return (to_ufixed (l, r'high, r'low) = r);
end function "=";
function "/=" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN is
begin
return (to_ufixed (l, r'high, r'low) /= r);
end function "/=";
function ">=" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN is
begin
return (to_ufixed (l, r'high, r'low) >= r);
end function ">=";
function "<=" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN is
begin
return (to_ufixed (l, r'high, r'low) <= r);
end function "<=";
function ">" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN is
begin
return (to_ufixed (l, r'high, r'low) > r);
end function ">";
function "<" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN is
begin
return (to_ufixed (l, r'high, r'low) < r);
end function "<";
function "?=" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_ufixed (l, r'high, r'low) ?= r);
end function "?=";
function "?/=" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_ufixed (l, r'high, r'low) ?/= r);
end function "?/=";
function "?>=" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_ufixed (l, r'high, r'low) ?>= r);
end function "?>=";
function "?<=" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_ufixed (l, r'high, r'low) ?<= r);
end function "?<=";
function "?>" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_ufixed (l, r'high, r'low) ?> r);
end function "?>";
function "?<" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_ufixed (l, r'high, r'low) ?< r);
end function "?<";
function maximum (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return maximum (to_ufixed (l, r'high, r'low), r);
end function maximum;
function minimum (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return minimum (to_ufixed (l, r'high, r'low), r);
end function minimum;
-- overloaded ufixed compare functions with real
function "=" (
l : UNRESOLVED_ufixed;
r : REAL)
return BOOLEAN is
begin
return (l = to_ufixed (r, l'high, l'low));
end function "=";
function "/=" (
l : UNRESOLVED_ufixed;
r : REAL)
return BOOLEAN is
begin
return (l /= to_ufixed (r, l'high, l'low));
end function "/=";
function ">=" (
l : UNRESOLVED_ufixed;
r : REAL)
return BOOLEAN is
begin
return (l >= to_ufixed (r, l'high, l'low));
end function ">=";
function "<=" (
l : UNRESOLVED_ufixed;
r : REAL)
return BOOLEAN is
begin
return (l <= to_ufixed (r, l'high, l'low));
end function "<=";
function ">" (
l : UNRESOLVED_ufixed;
r : REAL)
return BOOLEAN is
begin
return (l > to_ufixed (r, l'high, l'low));
end function ">";
function "<" (
l : UNRESOLVED_ufixed;
r : REAL)
return BOOLEAN is
begin
return (l < to_ufixed (r, l'high, l'low));
end function "<";
function "?=" (
l : UNRESOLVED_ufixed;
r : REAL)
return STD_ULOGIC is
begin
return (l ?= to_ufixed (r, l'high, l'low));
end function "?=";
function "?/=" (
l : UNRESOLVED_ufixed;
r : REAL)
return STD_ULOGIC is
begin
return (l ?/= to_ufixed (r, l'high, l'low));
end function "?/=";
function "?>=" (
l : UNRESOLVED_ufixed;
r : REAL)
return STD_ULOGIC is
begin
return (l ?>= to_ufixed (r, l'high, l'low));
end function "?>=";
function "?<=" (
l : UNRESOLVED_ufixed;
r : REAL)
return STD_ULOGIC is
begin
return (l ?<= to_ufixed (r, l'high, l'low));
end function "?<=";
function "?>" (
l : UNRESOLVED_ufixed;
r : REAL)
return STD_ULOGIC is
begin
return (l ?> to_ufixed (r, l'high, l'low));
end function "?>";
function "?<" (
l : UNRESOLVED_ufixed;
r : REAL)
return STD_ULOGIC is
begin
return (l ?< to_ufixed (r, l'high, l'low));
end function "?<";
function maximum (
l : UNRESOLVED_ufixed;
r : REAL)
return UNRESOLVED_ufixed is
begin
return maximum (l, to_ufixed (r, l'high, l'low));
end function maximum;
function minimum (
l : UNRESOLVED_ufixed;
r : REAL)
return UNRESOLVED_ufixed is
begin
return minimum (l, to_ufixed (r, l'high, l'low));
end function minimum;
-- real and ufixed
function "=" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN is
begin
return (to_ufixed (l, r'high, r'low) = r);
end function "=";
function "/=" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN is
begin
return (to_ufixed (l, r'high, r'low) /= r);
end function "/=";
function ">=" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN is
begin
return (to_ufixed (l, r'high, r'low) >= r);
end function ">=";
function "<=" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN is
begin
return (to_ufixed (l, r'high, r'low) <= r);
end function "<=";
function ">" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN is
begin
return (to_ufixed (l, r'high, r'low) > r);
end function ">";
function "<" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN is
begin
return (to_ufixed (l, r'high, r'low) < r);
end function "<";
function "?=" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_ufixed (l, r'high, r'low) ?= r);
end function "?=";
function "?/=" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_ufixed (l, r'high, r'low) ?/= r);
end function "?/=";
function "?>=" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_ufixed (l, r'high, r'low) ?>= r);
end function "?>=";
function "?<=" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_ufixed (l, r'high, r'low) ?<= r);
end function "?<=";
function "?>" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_ufixed (l, r'high, r'low) ?> r);
end function "?>";
function "?<" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_ufixed (l, r'high, r'low) ?< r);
end function "?<";
function maximum (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return maximum (to_ufixed (l, r'high, r'low), r);
end function maximum;
function minimum (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return minimum (to_ufixed (l, r'high, r'low), r);
end function minimum;
-- overloaded sfixed compare functions with integer
function "=" (
l : UNRESOLVED_sfixed;
r : INTEGER)
return BOOLEAN is
begin
return (l = to_sfixed (r, l'high, l'low));
end function "=";
function "/=" (
l : UNRESOLVED_sfixed;
r : INTEGER)
return BOOLEAN is
begin
return (l /= to_sfixed (r, l'high, l'low));
end function "/=";
function ">=" (
l : UNRESOLVED_sfixed;
r : INTEGER)
return BOOLEAN is
begin
return (l >= to_sfixed (r, l'high, l'low));
end function ">=";
function "<=" (
l : UNRESOLVED_sfixed;
r : INTEGER)
return BOOLEAN is
begin
return (l <= to_sfixed (r, l'high, l'low));
end function "<=";
function ">" (
l : UNRESOLVED_sfixed;
r : INTEGER)
return BOOLEAN is
begin
return (l > to_sfixed (r, l'high, l'low));
end function ">";
function "<" (
l : UNRESOLVED_sfixed;
r : INTEGER)
return BOOLEAN is
begin
return (l < to_sfixed (r, l'high, l'low));
end function "<";
function "?=" (
l : UNRESOLVED_sfixed;
r : INTEGER)
return STD_ULOGIC is
begin
return (l ?= to_sfixed (r, l'high, l'low));
end function "?=";
function "?/=" (
l : UNRESOLVED_sfixed;
r : INTEGER)
return STD_ULOGIC is
begin
return (l ?/= to_sfixed (r, l'high, l'low));
end function "?/=";
function "?>=" (
l : UNRESOLVED_sfixed;
r : INTEGER)
return STD_ULOGIC is
begin
return (l ?>= to_sfixed (r, l'high, l'low));
end function "?>=";
function "?<=" (
l : UNRESOLVED_sfixed;
r : INTEGER)
return STD_ULOGIC is
begin
return (l ?<= to_sfixed (r, l'high, l'low));
end function "?<=";
function "?>" (
l : UNRESOLVED_sfixed;
r : INTEGER)
return STD_ULOGIC is
begin
return (l ?> to_sfixed (r, l'high, l'low));
end function "?>";
function "?<" (
l : UNRESOLVED_sfixed;
r : INTEGER)
return STD_ULOGIC is
begin
return (l ?< to_sfixed (r, l'high, l'low));
end function "?<";
function maximum (
l : UNRESOLVED_sfixed;
r : INTEGER)
return UNRESOLVED_sfixed is
begin
return maximum (l, to_sfixed (r, l'high, l'low));
end function maximum;
function minimum (
l : UNRESOLVED_sfixed;
r : INTEGER)
return UNRESOLVED_sfixed is
begin
return minimum (l, to_sfixed (r, l'high, l'low));
end function minimum;
-- integer and sfixed
function "=" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN is
begin
return (to_sfixed (l, r'high, r'low) = r);
end function "=";
function "/=" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN is
begin
return (to_sfixed (l, r'high, r'low) /= r);
end function "/=";
function ">=" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN is
begin
return (to_sfixed (l, r'high, r'low) >= r);
end function ">=";
function "<=" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN is
begin
return (to_sfixed (l, r'high, r'low) <= r);
end function "<=";
function ">" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN is
begin
return (to_sfixed (l, r'high, r'low) > r);
end function ">";
function "<" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN is
begin
return (to_sfixed (l, r'high, r'low) < r);
end function "<";
function "?=" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_sfixed (l, r'high, r'low) ?= r);
end function "?=";
function "?/=" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_sfixed (l, r'high, r'low) ?/= r);
end function "?/=";
function "?>=" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_sfixed (l, r'high, r'low) ?>= r);
end function "?>=";
function "?<=" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_sfixed (l, r'high, r'low) ?<= r);
end function "?<=";
function "?>" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_sfixed (l, r'high, r'low) ?> r);
end function "?>";
function "?<" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_sfixed (l, r'high, r'low) ?< r);
end function "?<";
function maximum (
l : INTEGER;
r : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed is
begin
return maximum (to_sfixed (l, r'high, r'low), r);
end function maximum;
function minimum (
l : INTEGER;
r : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed is
begin
return minimum (to_sfixed (l, r'high, r'low), r);
end function minimum;
-- overloaded sfixed compare functions with real
function "=" (
l : UNRESOLVED_sfixed;
r : REAL)
return BOOLEAN is
begin
return (l = to_sfixed (r, l'high, l'low));
end function "=";
function "/=" (
l : UNRESOLVED_sfixed;
r : REAL)
return BOOLEAN is
begin
return (l /= to_sfixed (r, l'high, l'low));
end function "/=";
function ">=" (
l : UNRESOLVED_sfixed;
r : REAL)
return BOOLEAN is
begin
return (l >= to_sfixed (r, l'high, l'low));
end function ">=";
function "<=" (
l : UNRESOLVED_sfixed;
r : REAL)
return BOOLEAN is
begin
return (l <= to_sfixed (r, l'high, l'low));
end function "<=";
function ">" (
l : UNRESOLVED_sfixed;
r : REAL)
return BOOLEAN is
begin
return (l > to_sfixed (r, l'high, l'low));
end function ">";
function "<" (
l : UNRESOLVED_sfixed;
r : REAL)
return BOOLEAN is
begin
return (l < to_sfixed (r, l'high, l'low));
end function "<";
function "?=" (
l : UNRESOLVED_sfixed;
r : REAL)
return STD_ULOGIC is
begin
return (l ?= to_sfixed (r, l'high, l'low));
end function "?=";
function "?/=" (
l : UNRESOLVED_sfixed;
r : REAL)
return STD_ULOGIC is
begin
return (l ?/= to_sfixed (r, l'high, l'low));
end function "?/=";
function "?>=" (
l : UNRESOLVED_sfixed;
r : REAL)
return STD_ULOGIC is
begin
return (l ?>= to_sfixed (r, l'high, l'low));
end function "?>=";
function "?<=" (
l : UNRESOLVED_sfixed;
r : REAL)
return STD_ULOGIC is
begin
return (l ?<= to_sfixed (r, l'high, l'low));
end function "?<=";
function "?>" (
l : UNRESOLVED_sfixed;
r : REAL)
return STD_ULOGIC is
begin
return (l ?> to_sfixed (r, l'high, l'low));
end function "?>";
function "?<" (
l : UNRESOLVED_sfixed;
r : REAL)
return STD_ULOGIC is
begin
return (l ?< to_sfixed (r, l'high, l'low));
end function "?<";
function maximum (
l : UNRESOLVED_sfixed;
r : REAL)
return UNRESOLVED_sfixed is
begin
return maximum (l, to_sfixed (r, l'high, l'low));
end function maximum;
function minimum (
l : UNRESOLVED_sfixed;
r : REAL)
return UNRESOLVED_sfixed is
begin
return minimum (l, to_sfixed (r, l'high, l'low));
end function minimum;
-- REAL and sfixed
function "=" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN is
begin
return (to_sfixed (l, r'high, r'low) = r);
end function "=";
function "/=" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN is
begin
return (to_sfixed (l, r'high, r'low) /= r);
end function "/=";
function ">=" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN is
begin
return (to_sfixed (l, r'high, r'low) >= r);
end function ">=";
function "<=" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN is
begin
return (to_sfixed (l, r'high, r'low) <= r);
end function "<=";
function ">" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN is
begin
return (to_sfixed (l, r'high, r'low) > r);
end function ">";
function "<" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN is
begin
return (to_sfixed (l, r'high, r'low) < r);
end function "<";
function "?=" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_sfixed (l, r'high, r'low) ?= r);
end function "?=";
function "?/=" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_sfixed (l, r'high, r'low) ?/= r);
end function "?/=";
function "?>=" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_sfixed (l, r'high, r'low) ?>= r);
end function "?>=";
function "?<=" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_sfixed (l, r'high, r'low) ?<= r);
end function "?<=";
function "?>" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_sfixed (l, r'high, r'low) ?> r);
end function "?>";
function "?<" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_sfixed (l, r'high, r'low) ?< r);
end function "?<";
function maximum (
l : REAL;
r : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed is
begin
return maximum (to_sfixed (l, r'high, r'low), r);
end function maximum;
function minimum (
l : REAL;
r : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed is
begin
return minimum (to_sfixed (l, r'high, r'low), r);
end function minimum;
-- copied from std_logic_textio
type MVL9plus is ('U', 'X', '0', '1', 'Z', 'W', 'L', 'H', '-', error);
type char_indexed_by_MVL9 is array (STD_ULOGIC) of CHARACTER;
type MVL9_indexed_by_char is array (CHARACTER) of STD_ULOGIC;
type MVL9plus_indexed_by_char is array (CHARACTER) of MVL9plus;
constant MVL9_to_char : char_indexed_by_MVL9 := "UX01ZWLH-";
constant char_to_MVL9 : MVL9_indexed_by_char :=
('U' => 'U', 'X' => 'X', '0' => '0', '1' => '1', 'Z' => 'Z',
'W' => 'W', 'L' => 'L', 'H' => 'H', '-' => '-', others => 'U');
constant char_to_MVL9plus : MVL9plus_indexed_by_char :=
('U' => 'U', 'X' => 'X', '0' => '0', '1' => '1', 'Z' => 'Z',
'W' => 'W', 'L' => 'L', 'H' => 'H', '-' => '-', others => error);
constant NBSP : CHARACTER := CHARACTER'val(160); -- space character
constant NUS : STRING(2 to 1) := (others => ' ');
-- purpose: Skips white space
procedure skip_whitespace (
L : inout LINE) is
variable readOk : BOOLEAN;
variable c : CHARACTER;
begin
while L /= null and L.all'length /= 0 loop
c := l (l'left);
if (c = ' ' or c = NBSP or c = HT) then
read (l, c, readOk);
else
exit;
end if;
end loop;
end procedure skip_whitespace;
-- purpose: writes fixed point into a line
procedure write (
L : inout LINE; -- input line
VALUE : in UNRESOLVED_ufixed; -- fixed point input
JUSTIFIED : in SIDE := right;
FIELD : in WIDTH := 0) is
variable s : STRING(1 to value'length +1) := (others => ' ');
variable sindx : INTEGER;
begin -- function write Example: 0011.1100
sindx := 1;
for i in value'high downto value'low loop
if i = -1 then
s(sindx) := '.';
sindx := sindx + 1;
end if;
s(sindx) := MVL9_to_char(STD_ULOGIC(value(i)));
sindx := sindx + 1;
end loop;
write(l, s, justified, field);
end procedure write;
-- purpose: writes fixed point into a line
procedure write (
L : inout LINE; -- input line
VALUE : in UNRESOLVED_sfixed; -- fixed point input
JUSTIFIED : in SIDE := right;
FIELD : in WIDTH := 0) is
variable s : STRING(1 to value'length +1);
variable sindx : INTEGER;
begin -- function write Example: 0011.1100
sindx := 1;
for i in value'high downto value'low loop
if i = -1 then
s(sindx) := '.';
sindx := sindx + 1;
end if;
s(sindx) := MVL9_to_char(STD_ULOGIC(value(i)));
sindx := sindx + 1;
end loop;
write(l, s, justified, field);
end procedure write;
procedure READ(L : inout LINE;
VALUE : out UNRESOLVED_ufixed) is
-- Possible data: 00000.0000000
-- 000000000000
variable c : CHARACTER;
variable readOk : BOOLEAN;
variable i : INTEGER; -- index variable
variable mv : ufixed (VALUE'range);
variable lastu : BOOLEAN := false; -- last character was an "_"
variable founddot : BOOLEAN := false; -- found a "."
begin -- READ
VALUE := (VALUE'range => 'U');
Skip_whitespace (L);
if VALUE'length > 0 then -- non Null input string
read (l, c, readOk);
i := value'high;
while i >= VALUE'low loop
if readOk = false then -- Bail out if there was a bad read
report fixed_generic_pkg'instance_name & "READ(ufixed) "
& "End of string encountered"
severity error;
return;
elsif c = '_' then
if i = value'high then
report fixed_generic_pkg'instance_name & "READ(ufixed) "
& "String begins with an ""_""" severity error;
return;
elsif lastu then
report fixed_generic_pkg'instance_name & "READ(ufixed) "
& "Two underscores detected in input string ""__"""
severity error;
return;
else
lastu := true;
end if;
elsif c = '.' then -- binary point
if founddot then
report fixed_generic_pkg'instance_name & "READ(ufixed) "
& "Two binary points found in input string" severity error;
return;
elsif i /= -1 then -- Seperator in the wrong spot
report fixed_generic_pkg'instance_name & "READ(ufixed) "
& "Decimal point does not match number format "
severity error;
return;
end if;
founddot := true;
lastu := false;
elsif c = ' ' or c = NBSP or c = HT then -- reading done.
report fixed_generic_pkg'instance_name & "READ(ufixed) "
& "Short read, Space encounted in input string"
severity error;
return;
elsif char_to_MVL9plus(c) = error then
report fixed_generic_pkg'instance_name & "READ(ufixed) "
& "Character '" &
c & "' read, expected STD_ULOGIC literal."
severity error;
return;
else
mv(i) := char_to_MVL9(c);
i := i - 1;
if i < mv'low then
VALUE := mv;
return;
end if;
lastu := false;
end if;
read(L, c, readOk);
end loop;
end if;
end procedure READ;
procedure READ(L : inout LINE;
VALUE : out UNRESOLVED_ufixed;
GOOD : out BOOLEAN) is
-- Possible data: 00000.0000000
-- 000000000000
variable c : CHARACTER;
variable readOk : BOOLEAN;
variable mv : ufixed (VALUE'range);
variable i : INTEGER; -- index variable
variable lastu : BOOLEAN := false; -- last character was an "_"
variable founddot : BOOLEAN := false; -- found a "."
begin -- READ
VALUE := (VALUE'range => 'U');
Skip_whitespace (L);
if VALUE'length > 0 then
read (l, c, readOk);
i := value'high;
GOOD := false;
while i >= VALUE'low loop
if not readOk then -- Bail out if there was a bad read
return;
elsif c = '_' then
if i = value'high then -- Begins with an "_"
return;
elsif lastu then -- "__" detected
return;
else
lastu := true;
end if;
elsif c = '.' then -- binary point
if founddot then
return;
elsif i /= -1 then -- Seperator in the wrong spot
return;
end if;
founddot := true;
lastu := false;
elsif (char_to_MVL9plus(c) = error) then -- Illegal character/short read
return;
else
mv(i) := char_to_MVL9(c);
i := i - 1;
if i < mv'low then -- reading done
GOOD := true;
VALUE := mv;
return;
end if;
lastu := false;
end if;
read(L, c, readOk);
end loop;
else
GOOD := true; -- read into a null array
end if;
end procedure READ;
procedure READ(L : inout LINE;
VALUE : out UNRESOLVED_sfixed) is
variable c : CHARACTER;
variable readOk : BOOLEAN;
variable i : INTEGER; -- index variable
variable mv : sfixed (VALUE'range);
variable lastu : BOOLEAN := false; -- last character was an "_"
variable founddot : BOOLEAN := false; -- found a "."
begin -- READ
VALUE := (VALUE'range => 'U');
Skip_whitespace (L);
if VALUE'length > 0 then -- non Null input string
read (l, c, readOk);
i := value'high;
while i >= VALUE'low loop
if readOk = false then -- Bail out if there was a bad read
report fixed_generic_pkg'instance_name & "READ(sfixed) "
& "End of string encountered"
severity error;
return;
elsif c = '_' then
if i = value'high then
report fixed_generic_pkg'instance_name & "READ(sfixed) "
& "String begins with an ""_""" severity error;
return;
elsif lastu then
report fixed_generic_pkg'instance_name & "READ(sfixed) "
& "Two underscores detected in input string ""__"""
severity error;
return;
else
lastu := true;
end if;
elsif c = '.' then -- binary point
if founddot then
report fixed_generic_pkg'instance_name & "READ(sfixed) "
& "Two binary points found in input string" severity error;
return;
elsif i /= -1 then -- Seperator in the wrong spot
report fixed_generic_pkg'instance_name & "READ(sfixed) "
& "Decimal point does not match number format "
severity error;
return;
end if;
founddot := true;
lastu := false;
elsif c = ' ' or c = NBSP or c = HT then -- reading done.
report fixed_generic_pkg'instance_name & "READ(sfixed) "
& "Short read, Space encounted in input string"
severity error;
return;
elsif char_to_MVL9plus(c) = error then
report fixed_generic_pkg'instance_name & "READ(sfixed) "
& "Character '" &
c & "' read, expected STD_ULOGIC literal."
severity error;
return;
else
mv(i) := char_to_MVL9(c);
i := i - 1;
if i < mv'low then
VALUE := mv;
return;
end if;
lastu := false;
end if;
read(L, c, readOk);
end loop;
end if;
end procedure READ;
procedure READ(L : inout LINE;
VALUE : out UNRESOLVED_sfixed;
GOOD : out BOOLEAN) is
variable value_ufixed : UNRESOLVED_ufixed (VALUE'range);
begin -- READ
READ (L => L, VALUE => value_ufixed, GOOD => GOOD);
VALUE := UNRESOLVED_sfixed (value_ufixed);
end procedure READ;
-- octal read and write
procedure owrite (
L : inout LINE; -- input line
VALUE : in UNRESOLVED_ufixed; -- fixed point input
JUSTIFIED : in SIDE := right;
FIELD : in WIDTH := 0) is
begin -- Example 03.30
write (L => L,
VALUE => to_ostring (VALUE),
JUSTIFIED => JUSTIFIED,
FIELD => FIELD);
end procedure owrite;
procedure owrite (
L : inout LINE; -- input line
VALUE : in UNRESOLVED_sfixed; -- fixed point input
JUSTIFIED : in SIDE := right;
FIELD : in WIDTH := 0) is
begin -- Example 03.30
write (L => L,
VALUE => to_ostring (VALUE),
JUSTIFIED => JUSTIFIED,
FIELD => FIELD);
end procedure owrite;
-- Note that for Octal and Hex read, you can not start with a ".",
-- the read is for numbers formatted "A.BC". These routines go to
-- the nearest bounds, so "F.E" will fit into an sfixed (2 downto -3).
procedure Char2TriBits (C : CHARACTER;
RESULT : out STD_ULOGIC_VECTOR(2 downto 0);
GOOD : out BOOLEAN;
ISSUE_ERROR : in BOOLEAN) is
begin
case c is
when '0' => result := o"0"; good := true;
when '1' => result := o"1"; good := true;
when '2' => result := o"2"; good := true;
when '3' => result := o"3"; good := true;
when '4' => result := o"4"; good := true;
when '5' => result := o"5"; good := true;
when '6' => result := o"6"; good := true;
when '7' => result := o"7"; good := true;
when 'Z' => result := "ZZZ"; good := true;
when 'X' => result := "XXX"; good := true;
when others =>
assert not ISSUE_ERROR
report fixed_generic_pkg'instance_name
& "OREAD Error: Read a '" & c &
"', expected an Octal character (0-7)."
severity error;
result := "UUU";
good := false;
end case;
end procedure Char2TriBits;
-- purpose: Routines common to the OREAD routines
procedure OREAD_common (
L : inout LINE;
slv : out STD_ULOGIC_VECTOR;
igood : out BOOLEAN;
idex : out INTEGER;
constant bpoint : in INTEGER; -- binary point
constant message : in BOOLEAN;
constant smath : in BOOLEAN) is
-- purpose: error message routine
procedure errmes (
constant mess : in STRING) is -- error message
begin
if message then
if smath then
report fixed_generic_pkg'instance_name
& "OREAD(sfixed) "
& mess
severity error;
else
report fixed_generic_pkg'instance_name
& "OREAD(ufixed) "
& mess
severity error;
end if;
end if;
end procedure errmes;
variable xgood : BOOLEAN;
variable nybble : STD_ULOGIC_VECTOR (2 downto 0); -- 3 bits
variable c : CHARACTER;
variable i : INTEGER;
variable lastu : BOOLEAN := false; -- last character was an "_"
variable founddot : BOOLEAN := false; -- found a dot.
begin
Skip_whitespace (L);
if slv'length > 0 then
i := slv'high;
read (l, c, xgood);
while i > 0 loop
if xgood = false then
errmes ("Error: end of string encountered");
exit;
elsif c = '_' then
if i = slv'length then
errmes ("Error: String begins with an ""_""");
xgood := false;
exit;
elsif lastu then
errmes ("Error: Two underscores detected in input string ""__""");
xgood := false;
exit;
else
lastu := true;
end if;
elsif (c = '.') then
if (i + 1 /= bpoint) then
errmes ("encountered ""."" at wrong index");
xgood := false;
exit;
elsif i = slv'length then
errmes ("encounted a ""."" at the beginning of the line");
xgood := false;
exit;
elsif founddot then
errmes ("Two ""."" encounted in input string");
xgood := false;
exit;
end if;
founddot := true;
lastu := false;
else
Char2triBits(c, nybble, xgood, message);
if not xgood then
exit;
end if;
slv (i downto i-2) := nybble;
i := i - 3;
lastu := false;
end if;
if i > 0 then
read (L, c, xgood);
end if;
end loop;
idex := i;
igood := xgood;
else
igood := true; -- read into a null array
idex := -1;
end if;
end procedure OREAD_common;
-- Note that for Octal and Hex read, you can not start with a ".",
-- the read is for numbers formatted "A.BC". These routines go to
-- the nearest bounds, so "F.E" will fit into an sfixed (2 downto -3).
procedure OREAD (L : inout LINE;
VALUE : out UNRESOLVED_ufixed) is
constant hbv : INTEGER := (((maximum(3, (VALUE'high+1))+2)/3)*3)-1;
constant lbv : INTEGER := ((mine(0, VALUE'low)-2)/3)*3;
variable slv : STD_ULOGIC_VECTOR (hbv-lbv downto 0); -- high bits
variable valuex : UNRESOLVED_ufixed (hbv downto lbv);
variable igood : BOOLEAN;
variable i : INTEGER;
begin
VALUE := (VALUE'range => 'U');
OREAD_common ( L => L,
slv => slv,
igood => igood,
idex => i,
bpoint => -lbv,
message => true,
smath => false);
if igood then -- We did not get another error
if not ((i = -1) and -- We read everything, and high bits 0
(or (slv(hbv-lbv downto VALUE'high+1-lbv)) = '0')) then
report fixed_generic_pkg'instance_name
& "OREAD(ufixed): Vector truncated."
severity error;
else
if (or (slv(VALUE'low-lbv-1 downto 0)) = '1') then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& "OREAD(ufixed): Vector truncated"
severity warning;
end if;
valuex := to_ufixed (slv, hbv, lbv);
VALUE := valuex (VALUE'range);
end if;
end if;
end procedure OREAD;
procedure OREAD(L : inout LINE;
VALUE : out UNRESOLVED_ufixed;
GOOD : out BOOLEAN) is
constant hbv : INTEGER := (((maximum(3, (VALUE'high+1))+2)/3)*3)-1;
constant lbv : INTEGER := ((mine(0, VALUE'low)-2)/3)*3;
variable slv : STD_ULOGIC_VECTOR (hbv-lbv downto 0); -- high bits
variable valuex : UNRESOLVED_ufixed (hbv downto lbv);
variable igood : BOOLEAN;
variable i : INTEGER;
begin
VALUE := (VALUE'range => 'U');
OREAD_common ( L => L,
slv => slv,
igood => igood,
idex => i,
bpoint => -lbv,
message => false,
smath => false);
if (igood and -- We did not get another error
(i = -1) and -- We read everything, and high bits 0
(or (slv(hbv-lbv downto VALUE'high+1-lbv)) = '0')) then
valuex := to_ufixed (slv, hbv, lbv);
VALUE := valuex (VALUE'range);
good := true;
else
good := false;
end if;
end procedure OREAD;
procedure OREAD(L : inout LINE;
VALUE : out UNRESOLVED_sfixed) is
constant hbv : INTEGER := (((maximum(3, (VALUE'high+1))+2)/3)*3)-1;
constant lbv : INTEGER := ((mine(0, VALUE'low)-2)/3)*3;
variable slv : STD_ULOGIC_VECTOR (hbv-lbv downto 0); -- high bits
variable valuex : UNRESOLVED_sfixed (hbv downto lbv);
variable igood : BOOLEAN;
variable i : INTEGER;
begin
VALUE := (VALUE'range => 'U');
OREAD_common ( L => L,
slv => slv,
igood => igood,
idex => i,
bpoint => -lbv,
message => true,
smath => true);
if igood then -- We did not get another error
if not ((i = -1) and -- We read everything
((slv(VALUE'high-lbv) = '0' and -- sign bits = extra bits
or (slv(hbv-lbv downto VALUE'high+1-lbv)) = '0') or
(slv(VALUE'high-lbv) = '1' and
and (slv(hbv-lbv downto VALUE'high+1-lbv)) = '1'))) then
report fixed_generic_pkg'instance_name
& "OREAD(sfixed): Vector truncated."
severity error;
else
if (or (slv(VALUE'low-lbv-1 downto 0)) = '1') then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& "OREAD(sfixed): Vector truncated"
severity warning;
end if;
valuex := to_sfixed (slv, hbv, lbv);
VALUE := valuex (VALUE'range);
end if;
end if;
end procedure OREAD;
procedure OREAD(L : inout LINE;
VALUE : out UNRESOLVED_sfixed;
GOOD : out BOOLEAN) is
constant hbv : INTEGER := (((maximum(3, (VALUE'high+1))+2)/3)*3)-1;
constant lbv : INTEGER := ((mine(0, VALUE'low)-2)/3)*3;
variable slv : STD_ULOGIC_VECTOR (hbv-lbv downto 0); -- high bits
variable valuex : UNRESOLVED_sfixed (hbv downto lbv);
variable igood : BOOLEAN;
variable i : INTEGER;
begin
VALUE := (VALUE'range => 'U');
OREAD_common ( L => L,
slv => slv,
igood => igood,
idex => i,
bpoint => -lbv,
message => false,
smath => true);
if (igood -- We did not get another error
and (i = -1) -- We read everything
and ((slv(VALUE'high-lbv) = '0' and -- sign bits = extra bits
or (slv(hbv-lbv downto VALUE'high+1-lbv)) = '0') or
(slv(VALUE'high-lbv) = '1' and
and (slv(hbv-lbv downto VALUE'high+1-lbv)) = '1'))) then
valuex := to_sfixed (slv, hbv, lbv);
VALUE := valuex (VALUE'range);
good := true;
else
good := false;
end if;
end procedure OREAD;
-- hex read and write
procedure hwrite (
L : inout LINE; -- input line
VALUE : in UNRESOLVED_ufixed; -- fixed point input
JUSTIFIED : in SIDE := right;
FIELD : in WIDTH := 0) is
begin -- Example 03.30
write (L => L,
VALUE => to_hstring (VALUE),
JUSTIFIED => JUSTIFIED,
FIELD => FIELD);
end procedure hwrite;
-- purpose: writes fixed point into a line
procedure hwrite (
L : inout LINE; -- input line
VALUE : in UNRESOLVED_sfixed; -- fixed point input
JUSTIFIED : in SIDE := right;
FIELD : in WIDTH := 0) is
begin -- Example 03.30
write (L => L,
VALUE => to_hstring (VALUE),
JUSTIFIED => JUSTIFIED,
FIELD => FIELD);
end procedure hwrite;
-- Hex Read and Write procedures for STD_ULOGIC_VECTOR.
-- Modified from the original to be more forgiving.
procedure Char2QuadBits (C : CHARACTER;
RESULT : out STD_ULOGIC_VECTOR(3 downto 0);
GOOD : out BOOLEAN;
ISSUE_ERROR : in BOOLEAN) is
begin
case c is
when '0' => result := x"0"; good := true;
when '1' => result := x"1"; good := true;
when '2' => result := x"2"; good := true;
when '3' => result := x"3"; good := true;
when '4' => result := x"4"; good := true;
when '5' => result := x"5"; good := true;
when '6' => result := x"6"; good := true;
when '7' => result := x"7"; good := true;
when '8' => result := x"8"; good := true;
when '9' => result := x"9"; good := true;
when 'A' | 'a' => result := x"A"; good := true;
when 'B' | 'b' => result := x"B"; good := true;
when 'C' | 'c' => result := x"C"; good := true;
when 'D' | 'd' => result := x"D"; good := true;
when 'E' | 'e' => result := x"E"; good := true;
when 'F' | 'f' => result := x"F"; good := true;
when 'Z' => result := "ZZZZ"; good := true;
when 'X' => result := "XXXX"; good := true;
when others =>
assert not ISSUE_ERROR
report fixed_generic_pkg'instance_name
& "HREAD Error: Read a '" & c &
"', expected a Hex character (0-F)."
severity error;
result := "UUUU";
good := false;
end case;
end procedure Char2QuadBits;
-- purpose: Routines common to the HREAD routines
procedure HREAD_common (
L : inout LINE;
slv : out STD_ULOGIC_VECTOR;
igood : out BOOLEAN;
idex : out INTEGER;
constant bpoint : in INTEGER; -- binary point
constant message : in BOOLEAN;
constant smath : in BOOLEAN) is
-- purpose: error message routine
procedure errmes (
constant mess : in STRING) is -- error message
begin
if message then
if smath then
report fixed_generic_pkg'instance_name
& "HREAD(sfixed) "
& mess
severity error;
else
report fixed_generic_pkg'instance_name
& "HREAD(ufixed) "
& mess
severity error;
end if;
end if;
end procedure errmes;
variable xgood : BOOLEAN;
variable nybble : STD_ULOGIC_VECTOR (3 downto 0); -- 4 bits
variable c : CHARACTER;
variable i : INTEGER;
variable lastu : BOOLEAN := false; -- last character was an "_"
variable founddot : BOOLEAN := false; -- found a dot.
begin
Skip_whitespace (L);
if slv'length > 0 then
i := slv'high;
read (l, c, xgood);
while i > 0 loop
if xgood = false then
errmes ("Error: end of string encountered");
exit;
elsif c = '_' then
if i = slv'length then
errmes ("Error: String begins with an ""_""");
xgood := false;
exit;
elsif lastu then
errmes ("Error: Two underscores detected in input string ""__""");
xgood := false;
exit;
else
lastu := true;
end if;
elsif (c = '.') then
if (i + 1 /= bpoint) then
errmes ("encountered ""."" at wrong index");
xgood := false;
exit;
elsif i = slv'length then
errmes ("encounted a ""."" at the beginning of the line");
xgood := false;
exit;
elsif founddot then
errmes ("Two ""."" encounted in input string");
xgood := false;
exit;
end if;
founddot := true;
lastu := false;
else
Char2QuadBits(c, nybble, xgood, message);
if not xgood then
exit;
end if;
slv (i downto i-3) := nybble;
i := i - 4;
lastu := false;
end if;
if i > 0 then
read (L, c, xgood);
end if;
end loop;
idex := i;
igood := xgood;
else
idex := -1;
igood := true; -- read null string
end if;
end procedure HREAD_common;
procedure HREAD(L : inout LINE;
VALUE : out UNRESOLVED_ufixed) is
constant hbv : INTEGER := (((maximum(4, (VALUE'high+1))+3)/4)*4)-1;
constant lbv : INTEGER := ((mine(0, VALUE'low)-3)/4)*4;
variable slv : STD_ULOGIC_VECTOR (hbv-lbv downto 0); -- high bits
variable valuex : UNRESOLVED_ufixed (hbv downto lbv);
variable igood : BOOLEAN;
variable i : INTEGER;
begin
VALUE := (VALUE'range => 'U');
HREAD_common ( L => L,
slv => slv,
igood => igood,
idex => i,
bpoint => -lbv,
message => false,
smath => false);
if igood then
if not ((i = -1) and -- We read everything, and high bits 0
(or (slv(hbv-lbv downto VALUE'high+1-lbv)) = '0')) then
report fixed_generic_pkg'instance_name
& "HREAD(ufixed): Vector truncated."
severity error;
else
if (or (slv(VALUE'low-lbv-1 downto 0)) = '1') then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& "HREAD(ufixed): Vector truncated"
severity warning;
end if;
valuex := to_ufixed (slv, hbv, lbv);
VALUE := valuex (VALUE'range);
end if;
end if;
end procedure HREAD;
procedure HREAD(L : inout LINE;
VALUE : out UNRESOLVED_ufixed;
GOOD : out BOOLEAN) is
constant hbv : INTEGER := (((maximum(4, (VALUE'high+1))+3)/4)*4)-1;
constant lbv : INTEGER := ((mine(0, VALUE'low)-3)/4)*4;
variable slv : STD_ULOGIC_VECTOR (hbv-lbv downto 0); -- high bits
variable valuex : UNRESOLVED_ufixed (hbv downto lbv);
variable igood : BOOLEAN;
variable i : INTEGER;
begin
VALUE := (VALUE'range => 'U');
HREAD_common ( L => L,
slv => slv,
igood => igood,
idex => i,
bpoint => -lbv,
message => false,
smath => false);
if (igood and -- We did not get another error
(i = -1) and -- We read everything, and high bits 0
(or (slv(hbv-lbv downto VALUE'high+1-lbv)) = '0')) then
valuex := to_ufixed (slv, hbv, lbv);
VALUE := valuex (VALUE'range);
good := true;
else
good := false;
end if;
end procedure HREAD;
procedure HREAD(L : inout LINE;
VALUE : out UNRESOLVED_sfixed) is
constant hbv : INTEGER := (((maximum(4, (VALUE'high+1))+3)/4)*4)-1;
constant lbv : INTEGER := ((mine(0, VALUE'low)-3)/4)*4;
variable slv : STD_ULOGIC_VECTOR (hbv-lbv downto 0); -- high bits
variable valuex : UNRESOLVED_sfixed (hbv downto lbv);
variable igood : BOOLEAN;
variable i : INTEGER;
begin
VALUE := (VALUE'range => 'U');
HREAD_common ( L => L,
slv => slv,
igood => igood,
idex => i,
bpoint => -lbv,
message => true,
smath => true);
if igood then -- We did not get another error
if not ((i = -1) -- We read everything
and ((slv(VALUE'high-lbv) = '0' and -- sign bits = extra bits
or (slv(hbv-lbv downto VALUE'high+1-lbv)) = '0') or
(slv(VALUE'high-lbv) = '1' and
and (slv(hbv-lbv downto VALUE'high+1-lbv)) = '1'))) then
report fixed_generic_pkg'instance_name
& "HREAD(sfixed): Vector truncated."
severity error;
else
if (or (slv(VALUE'low-lbv-1 downto 0)) = '1') then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& "HREAD(sfixed): Vector truncated"
severity warning;
end if;
valuex := to_sfixed (slv, hbv, lbv);
VALUE := valuex (VALUE'range);
end if;
end if;
end procedure HREAD;
procedure HREAD(L : inout LINE;
VALUE : out UNRESOLVED_sfixed;
GOOD : out BOOLEAN) is
constant hbv : INTEGER := (((maximum(4, (VALUE'high+1))+3)/4)*4)-1;
constant lbv : INTEGER := ((mine(0, VALUE'low)-3)/4)*4;
variable slv : STD_ULOGIC_VECTOR (hbv-lbv downto 0); -- high bits
variable valuex : UNRESOLVED_sfixed (hbv downto lbv);
variable igood : BOOLEAN;
variable i : INTEGER;
begin
VALUE := (VALUE'range => 'U');
HREAD_common ( L => L,
slv => slv,
igood => igood,
idex => i,
bpoint => -lbv,
message => false,
smath => true);
if (igood and -- We did not get another error
(i = -1) and -- We read everything
((slv(VALUE'high-lbv) = '0' and -- sign bits = extra bits
or (slv(hbv-lbv downto VALUE'high+1-lbv)) = '0') or
(slv(VALUE'high-lbv) = '1' and
and (slv(hbv-lbv downto VALUE'high+1-lbv)) = '1'))) then
valuex := to_sfixed (slv, hbv, lbv);
VALUE := valuex (VALUE'range);
good := true;
else
good := false;
end if;
end procedure HREAD;
-- To_string functions. Useful in "report" statements.
-- Example: report "result was " & to_string(result);
function to_string (value : UNRESOLVED_ufixed) return STRING is
variable s : STRING(1 to value'length +1) := (others => ' ');
variable subval : UNRESOLVED_ufixed (value'high downto -1);
variable sindx : INTEGER;
begin
if value'length < 1 then
return NUS;
else
if value'high < 0 then
if value(value'high) = 'Z' then
return to_string (resize (sfixed(value), 0, value'low));
else
return to_string (resize (value, 0, value'low));
end if;
elsif value'low >= 0 then
if Is_X (value(value'low)) then
subval := (others => value(value'low));
subval (value'range) := value;
return to_string(subval);
else
return to_string (resize (value, value'high, -1));
end if;
else
sindx := 1;
for i in value'high downto value'low loop
if i = -1 then
s(sindx) := '.';
sindx := sindx + 1;
end if;
s(sindx) := MVL9_to_char(STD_ULOGIC(value(i)));
sindx := sindx + 1;
end loop;
return s;
end if;
end if;
end function to_string;
function to_string (value : UNRESOLVED_sfixed) return STRING is
variable s : STRING(1 to value'length + 1) := (others => ' ');
variable subval : UNRESOLVED_sfixed (value'high downto -1);
variable sindx : INTEGER;
begin
if value'length < 1 then
return NUS;
else
if value'high < 0 then
return to_string (resize (value, 0, value'low));
elsif value'low >= 0 then
if Is_X (value(value'low)) then
subval := (others => value(value'low));
subval (value'range) := value;
return to_string(subval);
else
return to_string (resize (value, value'high, -1));
end if;
else
sindx := 1;
for i in value'high downto value'low loop
if i = -1 then
s(sindx) := '.';
sindx := sindx + 1;
end if;
s(sindx) := MVL9_to_char(STD_ULOGIC(value(i)));
sindx := sindx + 1;
end loop;
return s;
end if;
end if;
end function to_string;
function to_ostring (value : UNRESOLVED_ufixed) return STRING is
constant lne : INTEGER := (-VALUE'low+2)/3;
variable subval : UNRESOLVED_ufixed (value'high downto -3);
variable lpad : STD_ULOGIC_VECTOR (0 to (lne*3 + VALUE'low) -1);
variable slv : STD_ULOGIC_VECTOR (value'length-1 downto 0);
begin
if value'length < 1 then
return NUS;
else
if value'high < 0 then
if value(value'high) = 'Z' then
return to_ostring (resize (sfixed(value), 2, value'low));
else
return to_ostring (resize (value, 2, value'low));
end if;
elsif value'low >= 0 then
if Is_X (value(value'low)) then
subval := (others => value(value'low));
subval (value'range) := value;
return to_ostring(subval);
else
return to_ostring (resize (value, value'high, -3));
end if;
else
slv := to_sulv (value);
if Is_X (value (value'low)) then
lpad := (others => value (value'low));
else
lpad := (others => '0');
end if;
return to_ostring(slv(slv'high downto slv'high-VALUE'high))
& "."
& to_ostring(slv(slv'high-VALUE'high-1 downto 0) & lpad);
end if;
end if;
end function to_ostring;
function to_hstring (value : UNRESOLVED_ufixed) return STRING is
constant lne : INTEGER := (-VALUE'low+3)/4;
variable subval : UNRESOLVED_ufixed (value'high downto -4);
variable lpad : STD_ULOGIC_VECTOR (0 to (lne*4 + VALUE'low) -1);
variable slv : STD_ULOGIC_VECTOR (value'length-1 downto 0);
begin
if value'length < 1 then
return NUS;
else
if value'high < 0 then
if value(value'high) = 'Z' then
return to_hstring (resize (sfixed(value), 3, value'low));
else
return to_hstring (resize (value, 3, value'low));
end if;
elsif value'low >= 0 then
if Is_X (value(value'low)) then
subval := (others => value(value'low));
subval (value'range) := value;
return to_hstring(subval);
else
return to_hstring (resize (value, value'high, -4));
end if;
else
slv := to_sulv (value);
if Is_X (value (value'low)) then
lpad := (others => value(value'low));
else
lpad := (others => '0');
end if;
return to_hstring(slv(slv'high downto slv'high-VALUE'high))
& "."
& to_hstring(slv(slv'high-VALUE'high-1 downto 0)&lpad);
end if;
end if;
end function to_hstring;
function to_ostring (value : UNRESOLVED_sfixed) return STRING is
constant ne : INTEGER := ((value'high+1)+2)/3;
variable pad : STD_ULOGIC_VECTOR(0 to (ne*3 - (value'high+1)) - 1);
constant lne : INTEGER := (-VALUE'low+2)/3;
variable subval : UNRESOLVED_sfixed (value'high downto -3);
variable lpad : STD_ULOGIC_VECTOR (0 to (lne*3 + VALUE'low) -1);
variable slv : STD_ULOGIC_VECTOR (VALUE'high - VALUE'low downto 0);
begin
if value'length < 1 then
return NUS;
else
if value'high < 0 then
return to_ostring (resize (value, 2, value'low));
elsif value'low >= 0 then
if Is_X (value(value'low)) then
subval := (others => value(value'low));
subval (value'range) := value;
return to_ostring(subval);
else
return to_ostring (resize (value, value'high, -3));
end if;
else
pad := (others => value(value'high));
slv := to_sulv (value);
if Is_X (value (value'low)) then
lpad := (others => value(value'low));
else
lpad := (others => '0');
end if;
return to_ostring(pad & slv(slv'high downto slv'high-VALUE'high))
& "."
& to_ostring(slv(slv'high-VALUE'high-1 downto 0) & lpad);
end if;
end if;
end function to_ostring;
function to_hstring (value : UNRESOLVED_sfixed) return STRING is
constant ne : INTEGER := ((value'high+1)+3)/4;
variable pad : STD_ULOGIC_VECTOR(0 to (ne*4 - (value'high+1)) - 1);
constant lne : INTEGER := (-VALUE'low+3)/4;
variable subval : UNRESOLVED_sfixed (value'high downto -4);
variable lpad : STD_ULOGIC_VECTOR (0 to (lne*4 + VALUE'low) -1);
variable slv : STD_ULOGIC_VECTOR (value'length-1 downto 0);
begin
if value'length < 1 then
return NUS;
else
if value'high < 0 then
return to_hstring (resize (value, 3, value'low));
elsif value'low >= 0 then
if Is_X (value(value'low)) then
subval := (others => value(value'low));
subval (value'range) := value;
return to_hstring(subval);
else
return to_hstring (resize (value, value'high, -4));
end if;
else
slv := to_sulv (value);
pad := (others => value(value'high));
if Is_X (value (value'low)) then
lpad := (others => value(value'low));
else
lpad := (others => '0');
end if;
return to_hstring(pad & slv(slv'high downto slv'high-VALUE'high))
& "."
& to_hstring(slv(slv'high-VALUE'high-1 downto 0) & lpad);
end if;
end if;
end function to_hstring;
-- From string functions allow you to convert a string into a fixed
-- point number. Example:
-- signal uf1 : ufixed (3 downto -3);
-- uf1 <= from_string ("0110.100", uf1'high, uf1'low); -- 6.5
-- The "." is optional in this syntax, however it exist and is
-- in the wrong location an error is produced. Overflow will
-- result in saturation.
function from_string (
bstring : STRING; -- binary string
constant left_index : INTEGER;
constant right_index : INTEGER)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (left_index downto right_index);
variable L : LINE;
variable good : BOOLEAN;
begin
L := new STRING'(bstring);
read (L, result, good);
deallocate (L);
assert (good)
report fixed_generic_pkg'instance_name
& "from_string: Bad string "& bstring severity error;
return result;
end function from_string;
-- Octal and hex conversions work as follows:
-- uf1 <= from_hstring ("6.8", 3, -3); -- 6.5 (bottom zeros dropped)
-- uf1 <= from_ostring ("06.4", 3, -3); -- 6.5 (top zeros dropped)
function from_ostring (
ostring : STRING; -- Octal string
constant left_index : INTEGER;
constant right_index : INTEGER)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (left_index downto right_index);
variable L : LINE;
variable good : BOOLEAN;
begin
L := new STRING'(ostring);
oread (L, result, good);
deallocate (L);
assert (good)
report fixed_generic_pkg'instance_name
& "from_ostring: Bad string "& ostring severity error;
return result;
end function from_ostring;
function from_hstring (
hstring : STRING; -- hex string
constant left_index : INTEGER;
constant right_index : INTEGER)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (left_index downto right_index);
variable L : LINE;
variable good : BOOLEAN;
begin
L := new STRING'(hstring);
hread (L, result, good);
deallocate (L);
assert (good)
report fixed_generic_pkg'instance_name
& "from_hstring: Bad string "& hstring severity error;
return result;
end function from_hstring;
function from_string (
bstring : STRING; -- binary string
constant left_index : INTEGER;
constant right_index : INTEGER)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (left_index downto right_index);
variable L : LINE;
variable good : BOOLEAN;
begin
L := new STRING'(bstring);
read (L, result, good);
deallocate (L);
assert (good)
report fixed_generic_pkg'instance_name
& "from_string: Bad string "& bstring severity error;
return result;
end function from_string;
function from_ostring (
ostring : STRING; -- Octal string
constant left_index : INTEGER;
constant right_index : INTEGER)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (left_index downto right_index);
variable L : LINE;
variable good : BOOLEAN;
begin
L := new STRING'(ostring);
oread (L, result, good);
deallocate (L);
assert (good)
report fixed_generic_pkg'instance_name
& "from_ostring: Bad string "& ostring severity error;
return result;
end function from_ostring;
function from_hstring (
hstring : STRING; -- hex string
constant left_index : INTEGER;
constant right_index : INTEGER)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (left_index downto right_index);
variable L : LINE;
variable good : BOOLEAN;
begin
L := new STRING'(hstring);
hread (L, result, good);
deallocate (L);
assert (good)
report fixed_generic_pkg'instance_name
& "from_hstring: Bad string "& hstring severity error;
return result;
end function from_hstring;
-- Same as above, "size_res" is used for it's range only.
function from_string (
bstring : STRING; -- binary string
size_res : UNRESOLVED_ufixed)
return UNRESOLVED_ufixed is
begin
return from_string (bstring, size_res'high, size_res'low);
end function from_string;
function from_ostring (
ostring : STRING; -- Octal string
size_res : UNRESOLVED_ufixed)
return UNRESOLVED_ufixed is
begin
return from_ostring (ostring, size_res'high, size_res'low);
end function from_ostring;
function from_hstring (
hstring : STRING; -- hex string
size_res : UNRESOLVED_ufixed)
return UNRESOLVED_ufixed is
begin
return from_hstring(hstring, size_res'high, size_res'low);
end function from_hstring;
function from_string (
bstring : STRING; -- binary string
size_res : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed is
begin
return from_string (bstring, size_res'high, size_res'low);
end function from_string;
function from_ostring (
ostring : STRING; -- Octal string
size_res : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed is
begin
return from_ostring (ostring, size_res'high, size_res'low);
end function from_ostring;
function from_hstring (
hstring : STRING; -- hex string
size_res : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed is
begin
return from_hstring (hstring, size_res'high, size_res'low);
end function from_hstring;
-- Direct conversion functions. Example:
-- signal uf1 : ufixed (3 downto -3);
-- uf1 <= from_string ("0110.100"); -- 6.5
-- In this case the "." is not optional, and the size of
-- the output must match exactly.
-- purpose: Calculate the string boundaries
procedure calculate_string_boundry (
arg : in STRING; -- input string
left_index : out INTEGER; -- left
right_index : out INTEGER) is -- right
-- examples "10001.111" would return +4, -3
-- "07X.44" would return +2, -2 (then the octal routine would multiply)
-- "A_B_._C" would return +1, -1 (then the hex routine would multiply)
alias xarg : STRING (arg'length downto 1) is arg; -- make it downto range
variable l, r : INTEGER; -- internal indexes
variable founddot : BOOLEAN := false;
begin
if arg'length > 0 then
l := xarg'high - 1;
r := 0;
for i in xarg'range loop
if xarg(i) = '_' then
if r = 0 then
l := l - 1;
else
r := r + 1;
end if;
elsif xarg(i) = ' ' or xarg(i) = NBSP or xarg(i) = HT then
report fixed_generic_pkg'instance_name
& "Found a space in the input STRING " & xarg
severity error;
elsif xarg(i) = '.' then
if founddot then
report fixed_generic_pkg'instance_name
& "Found two binary points in input string " & xarg
severity error;
else
l := l - i;
r := -i + 1;
founddot := true;
end if;
end if;
end loop;
left_index := l;
right_index := r;
else
left_index := 0;
right_index := 0;
end if;
end procedure calculate_string_boundry;
-- Direct conversion functions. Example:
-- signal uf1 : ufixed (3 downto -3);
-- uf1 <= from_string ("0110.100"); -- 6.5
-- In this case the "." is not optional, and the size of
-- the output must match exactly.
function from_string (
bstring : STRING) -- binary string
return UNRESOLVED_ufixed
is
variable left_index, right_index : INTEGER;
begin
calculate_string_boundry (bstring, left_index, right_index);
return from_string (bstring, left_index, right_index);
end function from_string;
-- Direct octal and hex conversion functions. In this case
-- the string lengths must match. Example:
-- signal sf1 := sfixed (5 downto -3);
-- sf1 <= from_ostring ("71.4") -- -6.5
function from_ostring (
ostring : STRING) -- Octal string
return UNRESOLVED_ufixed
is
variable left_index, right_index : INTEGER;
begin
calculate_string_boundry (ostring, left_index, right_index);
return from_ostring (ostring, ((left_index+1)*3)-1, right_index*3);
end function from_ostring;
function from_hstring (
hstring : STRING) -- hex string
return UNRESOLVED_ufixed
is
variable left_index, right_index : INTEGER;
begin
calculate_string_boundry (hstring, left_index, right_index);
return from_hstring (hstring, ((left_index+1)*4)-1, right_index*4);
end function from_hstring;
function from_string (
bstring : STRING) -- binary string
return UNRESOLVED_sfixed
is
variable left_index, right_index : INTEGER;
begin
calculate_string_boundry (bstring, left_index, right_index);
return from_string (bstring, left_index, right_index);
end function from_string;
function from_ostring (
ostring : STRING) -- Octal string
return UNRESOLVED_sfixed
is
variable left_index, right_index : INTEGER;
begin
calculate_string_boundry (ostring, left_index, right_index);
return from_ostring (ostring, ((left_index+1)*3)-1, right_index*3);
end function from_ostring;
function from_hstring (
hstring : STRING) -- hex string
return UNRESOLVED_sfixed
is
variable left_index, right_index : INTEGER;
begin
calculate_string_boundry (hstring, left_index, right_index);
return from_hstring (hstring, ((left_index+1)*4)-1, right_index*4);
end function from_hstring;
end package body fixed_generic_pkg;
|
-- --------------------------------------------------------------------
--
-- Copyright © 2008 by IEEE. All rights reserved.
--
-- This source file is an essential part of IEEE Std 1076-2008,
-- IEEE Standard VHDL Language Reference Manual. This source file may not be
-- copied, sold, or included with software that is sold without written
-- permission from the IEEE Standards Department. This source file may be
-- copied for individual use between licensed users. This source file is
-- provided on an AS IS basis. The IEEE disclaims ANY WARRANTY EXPRESS OR
-- IMPLIED INCLUDING ANY WARRANTY OF MERCHANTABILITY AND FITNESS FOR USE
-- FOR A PARTICULAR PURPOSE. The user of the source file shall indemnify
-- and hold IEEE harmless from any damages or liability arising out of the
-- use thereof.
--
-- Title : Fixed-point package (Generic package body)
-- :
-- Library : This package shall be compiled into a library
-- : symbolically named IEEE.
-- :
-- Developers: Accellera VHDL-TC and IEEE P1076 Working Group
-- :
-- Purpose : This packages defines basic binary fixed point arithmetic
-- : arithmetic functions
-- :
-- Note : This package may be modified to include additional data
-- : required by tools, but it must in no way change the
-- : external interfaces or simulation behavior of the
-- : description. It is permissible to add comments and/or
-- : attributes to the package declarations, but not to change
-- : or delete any original lines of the package declaration.
-- : The package body may be changed only in accordance with
-- : the terms of Clause 16 of this standard.
-- :
-- --------------------------------------------------------------------
-- $Revision: 1220 $
-- $Date: 2008-04-10 17:16:09 +0930 (Thu, 10 Apr 2008) $
-- --------------------------------------------------------------------
library IEEE;
use IEEE.MATH_REAL.all;
package body fixed_generic_pkg is
-- Author David Bishop (dbishop@vhdl.org)
-- Other contributers: Jim Lewis, Yannick Grugni, Ryan W. Hilton
-- null array constants
constant NAUF : UNRESOLVED_ufixed (0 downto 1) := (others => '0');
constant NASF : UNRESOLVED_sfixed (0 downto 1) := (others => '0');
constant NSLV : STD_ULOGIC_VECTOR (0 downto 1) := (others => '0');
-- This differed constant will tell you if the package body is synthesizable
-- or implemented as real numbers, set to "true" if synthesizable.
constant fixedsynth_or_real : BOOLEAN := true;
-- Special version of "minimum" to do some boundary checking without errors
function mins (l, r : INTEGER)
return INTEGER is
begin -- function mins
if (L = INTEGER'low or R = INTEGER'low) then
return 0; -- error condition, silent
end if;
return minimum (L, R);
end function mins;
-- Special version of "minimum" to do some boundary checking with errors
function mine (l, r : INTEGER)
return INTEGER is
begin -- function mine
if (L = INTEGER'low or R = INTEGER'low) then
report fixed_generic_pkg'instance_name
& " Unbounded number passed, was a literal used?"
severity error;
return 0;
end if;
return minimum (L, R);
end function mine;
-- The following functions are used only internally. Every function
-- calls "cleanvec" either directly or indirectly.
-- purpose: Fixes "downto" problem and resolves meta states
function cleanvec (
arg : UNRESOLVED_sfixed) -- input
return UNRESOLVED_sfixed
is
constant left_index : INTEGER := maximum(arg'left, arg'right);
constant right_index : INTEGER := mins(arg'left, arg'right);
variable result : UNRESOLVED_sfixed (arg'range);
begin -- function cleanvec
assert not (arg'ascending and (arg'low /= INTEGER'low))
report fixed_generic_pkg'instance_name
& " Vector passed using a ""to"" range, expected is ""downto"""
severity error;
return arg;
end function cleanvec;
-- purpose: Fixes "downto" problem and resolves meta states
function cleanvec (
arg : UNRESOLVED_ufixed) -- input
return UNRESOLVED_ufixed
is
constant left_index : INTEGER := maximum(arg'left, arg'right);
constant right_index : INTEGER := mins(arg'left, arg'right);
variable result : UNRESOLVED_ufixed (arg'range);
begin -- function cleanvec
assert not (arg'ascending and (arg'low /= INTEGER'low))
report fixed_generic_pkg'instance_name
& " Vector passed using a ""to"" range, expected is ""downto"""
severity error;
return arg;
end function cleanvec;
-- Type convert a "unsigned" into a "ufixed", used internally
function to_fixed (
arg : UNRESOLVED_UNSIGNED; -- shifted vector
constant left_index : INTEGER;
constant right_index : INTEGER)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (left_index downto right_index);
begin -- function to_fixed
result := UNRESOLVED_ufixed(arg);
return result;
end function to_fixed;
-- Type convert a "signed" into an "sfixed", used internally
function to_fixed (
arg : UNRESOLVED_SIGNED; -- shifted vector
constant left_index : INTEGER;
constant right_index : INTEGER)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (left_index downto right_index);
begin -- function to_fixed
result := UNRESOLVED_sfixed(arg);
return result;
end function to_fixed;
-- Type convert a "ufixed" into an "unsigned", used internally
function to_uns (
arg : UNRESOLVED_ufixed) -- fp vector
return UNRESOLVED_UNSIGNED
is
subtype t is UNRESOLVED_UNSIGNED(arg'high - arg'low downto 0);
variable slv : t;
begin -- function to_uns
slv := t(arg);
return slv;
end function to_uns;
-- Type convert an "sfixed" into a "signed", used internally
function to_s (
arg : UNRESOLVED_sfixed) -- fp vector
return UNRESOLVED_SIGNED
is
subtype t is UNRESOLVED_SIGNED(arg'high - arg'low downto 0);
variable slv : t;
begin -- function to_s
slv := t(arg);
return slv;
end function to_s;
-- adds 1 to the LSB of the number
procedure round_up (arg : in UNRESOLVED_ufixed;
result : out UNRESOLVED_ufixed;
overflowx : out BOOLEAN) is
variable arguns, resuns : UNRESOLVED_UNSIGNED (arg'high-arg'low+1 downto 0)
:= (others => '0');
begin -- round_up
arguns (arguns'high-1 downto 0) := to_uns (arg);
resuns := arguns + 1;
result := to_fixed(resuns(arg'high-arg'low
downto 0), arg'high, arg'low);
overflowx := (resuns(resuns'high) = '1');
end procedure round_up;
-- adds 1 to the LSB of the number
procedure round_up (arg : in UNRESOLVED_sfixed;
result : out UNRESOLVED_sfixed;
overflowx : out BOOLEAN) is
variable args, ress : UNRESOLVED_SIGNED (arg'high-arg'low+1 downto 0);
begin -- round_up
args (args'high-1 downto 0) := to_s (arg);
args(args'high) := arg(arg'high); -- sign extend
ress := args + 1;
result := to_fixed(ress (ress'high-1
downto 0), arg'high, arg'low);
overflowx := ((arg(arg'high) /= ress(ress'high-1))
and (or (STD_ULOGIC_VECTOR(ress)) /= '0'));
end procedure round_up;
-- Rounding - Performs a "round_nearest" (IEEE 754) which rounds up
-- when the remainder is > 0.5. If the remainder IS 0.5 then if the
-- bottom bit is a "1" it is rounded, otherwise it remains the same.
function round_fixed (arg : UNRESOLVED_ufixed;
remainder : UNRESOLVED_ufixed;
overflow_style : fixed_overflow_style_type := fixed_overflow_style)
return UNRESOLVED_ufixed
is
variable rounds : BOOLEAN;
variable round_overflow : BOOLEAN;
variable result : UNRESOLVED_ufixed (arg'range);
begin
rounds := false;
if (remainder'length > 1) then
if (remainder (remainder'high) = '1') then
rounds := (arg(arg'low) = '1')
or (or (to_sulv(remainder(remainder'high-1 downto
remainder'low))) = '1');
end if;
else
rounds := (arg(arg'low) = '1') and (remainder (remainder'high) = '1');
end if;
if rounds then
round_up(arg => arg,
result => result,
overflowx => round_overflow);
else
result := arg;
end if;
if (overflow_style = fixed_saturate) and round_overflow then
result := saturate (result'high, result'low);
end if;
return result;
end function round_fixed;
-- Rounding case statement
function round_fixed (arg : UNRESOLVED_sfixed;
remainder : UNRESOLVED_sfixed;
overflow_style : fixed_overflow_style_type := fixed_overflow_style)
return UNRESOLVED_sfixed
is
variable rounds : BOOLEAN;
variable round_overflow : BOOLEAN;
variable result : UNRESOLVED_sfixed (arg'range);
begin
rounds := false;
if (remainder'length > 1) then
if (remainder (remainder'high) = '1') then
rounds := (arg(arg'low) = '1')
or (or (to_sulv(remainder(remainder'high-1 downto
remainder'low))) = '1');
end if;
else
rounds := (arg(arg'low) = '1') and (remainder (remainder'high) = '1');
end if;
if rounds then
round_up(arg => arg,
result => result,
overflowx => round_overflow);
else
result := arg;
end if;
if round_overflow then
if (overflow_style = fixed_saturate) then
if arg(arg'high) = '0' then
result := saturate (result'high, result'low);
else
result := not saturate (result'high, result'low);
end if;
-- Sign bit not fixed when wrapping
end if;
end if;
return result;
end function round_fixed;
-- converts an sfixed into a ufixed. The output is the same length as the
-- input, because abs("1000") = "1000" = 8.
function to_ufixed (
arg : UNRESOLVED_sfixed)
return UNRESOLVED_ufixed
is
constant left_index : INTEGER := arg'high;
constant right_index : INTEGER := mine(arg'low, arg'low);
variable xarg : UNRESOLVED_sfixed(left_index+1 downto right_index);
variable result : UNRESOLVED_ufixed(left_index downto right_index);
begin
if arg'length < 1 then
return NAUF;
end if;
xarg := abs(arg);
result := UNRESOLVED_ufixed (xarg (left_index downto right_index));
return result;
end function to_ufixed;
-----------------------------------------------------------------------------
-- Visible functions
-----------------------------------------------------------------------------
-- Conversion functions. These are needed for synthesis where typically
-- the only input and output type is a std_logic_vector.
function to_sulv (
arg : UNRESOLVED_ufixed) -- fixed point vector
return STD_ULOGIC_VECTOR
is
subtype result_subtype is STD_ULOGIC_VECTOR (arg'length-1 downto 0);
variable result : result_subtype;
begin
if arg'length < 1 then
return NSLV;
end if;
result := result_subtype (arg);
return result;
end function to_sulv;
function to_sulv (
arg : UNRESOLVED_sfixed) -- fixed point vector
return STD_ULOGIC_VECTOR
is
subtype result_subtype is STD_ULOGIC_VECTOR (arg'length-1 downto 0);
variable result : result_subtype;
--variable result : STD_ULOGIC_VECTOR (arg'length-1 downto 0);
begin
if arg'length < 1 then
return NSLV;
end if;
--result := STD_ULOGIC_VECTOR (arg);
result := result_subtype (arg);
return result;
end function to_sulv;
function to_slv (
arg : UNRESOLVED_ufixed) -- fixed point vector
return STD_LOGIC_VECTOR is
begin
return to_sulv(arg);
end function to_slv;
function to_slv (
arg : UNRESOLVED_sfixed) -- fixed point vector
return STD_LOGIC_VECTOR is
begin
return to_sulv(arg);
end function to_slv;
function to_ufixed (
arg : STD_ULOGIC_VECTOR; -- shifted vector
constant left_index : INTEGER;
constant right_index : INTEGER)
return unresolved_ufixed
is
variable result : UNRESOLVED_ufixed (left_index downto right_index);
begin
if (arg'length < 1 or right_index > left_index) then
return NAUF;
end if;
if (arg'length /= result'length) then
report fixed_generic_pkg'instance_name & "TO_UFIXED(SLV) "
& "Vector lengths do not match. Input length is "
& INTEGER'image(arg'length) & " and output will be "
& INTEGER'image(result'length) & " wide."
severity error;
return NAUF;
else
result := to_fixed (arg => UNRESOLVED_UNSIGNED(arg),
left_index => left_index,
right_index => right_index);
return result;
end if;
end function to_ufixed;
function to_sfixed (
arg : STD_ULOGIC_VECTOR; -- shifted vector
constant left_index : INTEGER;
constant right_index : INTEGER)
return unresolved_sfixed
is
variable result : UNRESOLVED_sfixed (left_index downto right_index);
begin
if (arg'length < 1 or right_index > left_index) then
return NASF;
end if;
if (arg'length /= result'length) then
report fixed_generic_pkg'instance_name & "TO_SFIXED(SLV) "
& "Vector lengths do not match. Input length is "
& INTEGER'image(arg'length) & " and output will be "
& INTEGER'image(result'length) & " wide."
severity error;
return NASF;
else
result := to_fixed (arg => UNRESOLVED_SIGNED(arg),
left_index => left_index,
right_index => right_index);
return result;
end if;
end function to_sfixed;
-- Two's complement number, Grows the vector by 1 bit.
-- because "abs (1000.000) = 01000.000" or abs(-16) = 16.
function "abs" (
arg : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed
is
constant left_index : INTEGER := arg'high;
constant right_index : INTEGER := mine(arg'low, arg'low);
variable ressns : UNRESOLVED_SIGNED (arg'length downto 0);
variable result : UNRESOLVED_sfixed (left_index+1 downto right_index);
begin
if (arg'length < 1 or result'length < 1) then
return NASF;
end if;
ressns (arg'length-1 downto 0) := to_s (cleanvec (arg));
ressns (arg'length) := ressns (arg'length-1); -- expand sign bit
result := to_fixed (abs(ressns), left_index+1, right_index);
return result;
end function "abs";
-- also grows the vector by 1 bit.
function "-" (
arg : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed
is
constant left_index : INTEGER := arg'high+1;
constant right_index : INTEGER := mine(arg'low, arg'low);
variable ressns : UNRESOLVED_SIGNED (arg'length downto 0);
variable result : UNRESOLVED_sfixed (left_index downto right_index);
begin
if (arg'length < 1 or result'length < 1) then
return NASF;
end if;
ressns (arg'length-1 downto 0) := to_s (cleanvec(arg));
ressns (arg'length) := ressns (arg'length-1); -- expand sign bit
result := to_fixed (-ressns, left_index, right_index);
return result;
end function "-";
-- Addition
function "+" (
l, r : UNRESOLVED_ufixed) -- ufixed(a downto b) + ufixed(c downto d) =
return UNRESOLVED_ufixed -- ufixed(max(a,c)+1 downto min(b,d))
is
constant left_index : INTEGER := maximum(l'high, r'high)+1;
constant right_index : INTEGER := mine(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
variable result : UNRESOLVED_ufixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_UNSIGNED (left_index-right_index
downto 0);
variable result_slv : UNRESOLVED_UNSIGNED (left_index-right_index
downto 0);
begin
if (l'length < 1 or r'length < 1 or result'length < 1) then
return NAUF;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_uns (lresize);
rslv := to_uns (rresize);
result_slv := lslv + rslv;
result := to_fixed(result_slv, left_index, right_index);
return result;
end function "+";
function "+" (
l, r : UNRESOLVED_sfixed) -- sfixed(a downto b) + sfixed(c downto d) =
return UNRESOLVED_sfixed -- sfixed(max(a,c)+1 downto min(b,d))
is
constant left_index : INTEGER := maximum(l'high, r'high)+1;
constant right_index : INTEGER := mine(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
variable result : UNRESOLVED_sfixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_SIGNED (left_index-right_index downto 0);
variable result_slv : UNRESOLVED_SIGNED (left_index-right_index downto 0);
begin
if (l'length < 1 or r'length < 1 or result'length < 1) then
return NASF;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_s (lresize);
rslv := to_s (rresize);
result_slv := lslv + rslv;
result := to_fixed(result_slv, left_index, right_index);
return result;
end function "+";
-- Subtraction
function "-" (
l, r : UNRESOLVED_ufixed) -- ufixed(a downto b) - ufixed(c downto d) =
return UNRESOLVED_ufixed -- ufixed(max(a,c)+1 downto min(b,d))
is
constant left_index : INTEGER := maximum(l'high, r'high)+1;
constant right_index : INTEGER := mine(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
variable result : UNRESOLVED_ufixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_UNSIGNED (left_index-right_index
downto 0);
variable result_slv : UNRESOLVED_UNSIGNED (left_index-right_index
downto 0);
begin
if (l'length < 1 or r'length < 1 or result'length < 1) then
return NAUF;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_uns (lresize);
rslv := to_uns (rresize);
result_slv := lslv - rslv;
result := to_fixed(result_slv, left_index, right_index);
return result;
end function "-";
function "-" (
l, r : UNRESOLVED_sfixed) -- sfixed(a downto b) - sfixed(c downto d) =
return UNRESOLVED_sfixed -- sfixed(max(a,c)+1 downto min(b,d))
is
constant left_index : INTEGER := maximum(l'high, r'high)+1;
constant right_index : INTEGER := mine(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
variable result : UNRESOLVED_sfixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_SIGNED (left_index-right_index downto 0);
variable result_slv : UNRESOLVED_SIGNED (left_index-right_index downto 0);
begin
if (l'length < 1 or r'length < 1 or result'length < 1) then
return NASF;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_s (lresize);
rslv := to_s (rresize);
result_slv := lslv - rslv;
result := to_fixed(result_slv, left_index, right_index);
return result;
end function "-";
function "*" (
l, r : UNRESOLVED_ufixed) -- ufixed(a downto b) * ufixed(c downto d) =
return UNRESOLVED_ufixed -- ufixed(a+c+1 downto b+d)
is
variable lslv : UNRESOLVED_UNSIGNED (l'length-1 downto 0);
variable rslv : UNRESOLVED_UNSIGNED (r'length-1 downto 0);
variable result_slv : UNRESOLVED_UNSIGNED (r'length+l'length-1 downto 0);
variable result : UNRESOLVED_ufixed (l'high + r'high+1 downto
mine(l'low, l'low) + mine(r'low, r'low));
begin
if (l'length < 1 or r'length < 1 or
result'length /= result_slv'length) then
return NAUF;
end if;
lslv := to_uns (cleanvec(l));
rslv := to_uns (cleanvec(r));
result_slv := lslv * rslv;
result := to_fixed (result_slv, result'high, result'low);
return result;
end function "*";
function "*" (
l, r : UNRESOLVED_sfixed) -- sfixed(a downto b) * sfixed(c downto d) =
return UNRESOLVED_sfixed -- sfixed(a+c+1 downto b+d)
is
variable lslv : UNRESOLVED_SIGNED (l'length-1 downto 0);
variable rslv : UNRESOLVED_SIGNED (r'length-1 downto 0);
variable result_slv : UNRESOLVED_SIGNED (r'length+l'length-1 downto 0);
variable result : UNRESOLVED_sfixed (l'high + r'high+1 downto
mine(l'low, l'low) + mine(r'low, r'low));
begin
if (l'length < 1 or r'length < 1 or
result'length /= result_slv'length) then
return NASF;
end if;
lslv := to_s (cleanvec(l));
rslv := to_s (cleanvec(r));
result_slv := lslv * rslv;
result := to_fixed (result_slv, result'high, result'low);
return result;
end function "*";
function "/" (
l, r : UNRESOLVED_ufixed) -- ufixed(a downto b) / ufixed(c downto d) =
return UNRESOLVED_ufixed is -- ufixed(a-d downto b-c-1)
begin
return divide (l, r);
end function "/";
function "/" (
l, r : UNRESOLVED_sfixed) -- sfixed(a downto b) / sfixed(c downto d) =
return UNRESOLVED_sfixed is -- sfixed(a-d+1 downto b-c)
begin
return divide (l, r);
end function "/";
-- This version of divide gives the user more control
-- ufixed(a downto b) / ufixed(c downto d) = ufixed(a-d downto b-c-1)
function divide (
l, r : UNRESOLVED_ufixed;
constant round_style : fixed_round_style_type := fixed_round_style;
constant guard_bits : NATURAL := fixed_guard_bits)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (l'high - mine(r'low, r'low) downto
mine (l'low, l'low) - r'high -1);
variable dresult : UNRESOLVED_ufixed (result'high downto result'low -guard_bits);
variable lresize : UNRESOLVED_ufixed (l'high downto l'high - dresult'length+1);
variable lslv : UNRESOLVED_UNSIGNED (lresize'length-1 downto 0);
variable rslv : UNRESOLVED_UNSIGNED (r'length-1 downto 0);
variable result_slv : UNRESOLVED_UNSIGNED (lresize'length-1 downto 0);
begin
if (l'length < 1 or r'length < 1 or
mins(r'low, r'low) /= r'low or mins(l'low, l'low) /= l'low) then
return NAUF;
end if;
lresize := resize (arg => l,
left_index => lresize'high,
right_index => lresize'low,
overflow_style => fixed_wrap, -- vector only grows
round_style => fixed_truncate);
lslv := to_uns (cleanvec (lresize));
rslv := to_uns (cleanvec (r));
if (rslv = 0) then
report fixed_generic_pkg'instance_name
& "DIVIDE(ufixed) Division by zero" severity error;
result := saturate (result'high, result'low); -- saturate
else
result_slv := lslv / rslv;
dresult := to_fixed (result_slv, dresult'high, dresult'low);
result := resize (arg => dresult,
left_index => result'high,
right_index => result'low,
overflow_style => fixed_wrap, -- overflow impossible
round_style => round_style);
end if;
return result;
end function divide;
-- sfixed(a downto b) / sfixed(c downto d) = sfixed(a-d+1 downto b-c)
function divide (
l, r : UNRESOLVED_sfixed;
constant round_style : fixed_round_style_type := fixed_round_style;
constant guard_bits : NATURAL := fixed_guard_bits)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (l'high - mine(r'low, r'low) + 1 downto
mine (l'low, l'low) - r'high);
variable dresult : UNRESOLVED_sfixed (result'high downto result'low-guard_bits);
variable lresize : UNRESOLVED_sfixed (l'high+1 downto l'high+1 -dresult'length+1);
variable lslv : UNRESOLVED_SIGNED (lresize'length-1 downto 0);
variable rslv : UNRESOLVED_SIGNED (r'length-1 downto 0);
variable result_slv : UNRESOLVED_SIGNED (lresize'length-1 downto 0);
begin
if (l'length < 1 or r'length < 1 or
mins(r'low, r'low) /= r'low or mins(l'low, l'low) /= l'low) then
return NASF;
end if;
lresize := resize (arg => l,
left_index => lresize'high,
right_index => lresize'low,
overflow_style => fixed_wrap, -- vector only grows
round_style => fixed_truncate);
lslv := to_s (cleanvec (lresize));
rslv := to_s (cleanvec (r));
if (rslv = 0) then
report fixed_generic_pkg'instance_name
& "DIVIDE(sfixed) Division by zero" severity error;
result := saturate (result'high, result'low);
else
result_slv := lslv / rslv;
dresult := to_fixed (result_slv, dresult'high, dresult'low);
result := resize (arg => dresult,
left_index => result'high,
right_index => result'low,
overflow_style => fixed_wrap, -- overflow impossible
round_style => round_style);
end if;
return result;
end function divide;
-- 1 / ufixed(a downto b) = ufixed(-b downto -a-1)
function reciprocal (
arg : UNRESOLVED_ufixed; -- fixed point input
constant round_style : fixed_round_style_type := fixed_round_style;
constant guard_bits : NATURAL := fixed_guard_bits)
return UNRESOLVED_ufixed
is
constant one : UNRESOLVED_ufixed (0 downto 0) := "1";
begin
return divide (l => one,
r => arg,
round_style => round_style,
guard_bits => guard_bits);
end function reciprocal;
-- 1 / sfixed(a downto b) = sfixed(-b+1 downto -a)
function reciprocal (
arg : UNRESOLVED_sfixed; -- fixed point input
constant round_style : fixed_round_style_type := fixed_round_style;
constant guard_bits : NATURAL := fixed_guard_bits)
return UNRESOLVED_sfixed
is
constant one : UNRESOLVED_sfixed (1 downto 0) := "01"; -- extra bit.
variable resultx : UNRESOLVED_sfixed (-mine(arg'low, arg'low)+2 downto -arg'high);
begin
if (arg'length < 1 or resultx'length < 1) then
return NASF;
else
resultx := divide (l => one,
r => arg,
round_style => round_style,
guard_bits => guard_bits);
return resultx (resultx'high-1 downto resultx'low); -- remove extra bit
end if;
end function reciprocal;
-- ufixed (a downto b) rem ufixed (c downto d)
-- = ufixed (min(a,c) downto min(b,d))
function "rem" (
l, r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return remainder (l, r);
end function "rem";
-- remainder
-- sfixed (a downto b) rem sfixed (c downto d)
-- = sfixed (min(a,c) downto min(b,d))
function "rem" (
l, r : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed is
begin
return remainder (l, r);
end function "rem";
-- ufixed (a downto b) rem ufixed (c downto d)
-- = ufixed (min(a,c) downto min(b,d))
function remainder (
l, r : UNRESOLVED_ufixed; -- fixed point input
constant round_style : fixed_round_style_type := fixed_round_style;
constant guard_bits : NATURAL := fixed_guard_bits)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (minimum(l'high, r'high) downto
mine(l'low, r'low));
constant rlow : integer := mins(r'low, r'low);
variable lresize : UNRESOLVED_ufixed (maximum(l'high, r'low) downto
rlow-guard_bits);
variable rresize : UNRESOLVED_ufixed (r'high downto rlow-guard_bits);
variable dresult : UNRESOLVED_ufixed (rresize'range);
variable lslv : UNRESOLVED_UNSIGNED (lresize'length-1 downto 0);
variable rslv : UNRESOLVED_UNSIGNED (rresize'length-1 downto 0);
variable result_slv : UNRESOLVED_UNSIGNED (rslv'range);
begin
if (l'length < 1 or r'length < 1 or
mins(r'low, r'low) /= r'low or mins(l'low, l'low) /= l'low) then
return NAUF;
end if;
lresize := resize (arg => l,
left_index => lresize'high,
right_index => lresize'low,
overflow_style => fixed_wrap, -- vector only grows
round_style => fixed_truncate);
lslv := to_uns (lresize);
rresize := resize (arg => r,
left_index => rresize'high,
right_index => rresize'low,
overflow_style => fixed_wrap, -- vector only grows
round_style => fixed_truncate);
rslv := to_uns (rresize);
if (rslv = 0) then
report fixed_generic_pkg'instance_name
& "remainder(ufixed) Division by zero" severity error;
result := saturate (result'high, result'low); -- saturate
else
if (r'low <= l'high) then
result_slv := lslv rem rslv;
dresult := to_fixed (result_slv, dresult'high, dresult'low);
result := resize (arg => dresult,
left_index => result'high,
right_index => result'low,
overflow_style => fixed_wrap, -- can't overflow
round_style => round_style);
end if;
if l'low < r'low then
result(mins(r'low-1, l'high) downto l'low) :=
cleanvec(l(mins(r'low-1, l'high) downto l'low));
end if;
end if;
return result;
end function remainder;
-- remainder
-- sfixed (a downto b) rem sfixed (c downto d)
-- = sfixed (min(a,c) downto min(b,d))
function remainder (
l, r : UNRESOLVED_sfixed; -- fixed point input
constant round_style : fixed_round_style_type := fixed_round_style;
constant guard_bits : NATURAL := fixed_guard_bits)
return UNRESOLVED_sfixed
is
variable l_abs : UNRESOLVED_ufixed (l'range);
variable r_abs : UNRESOLVED_ufixed (r'range);
variable result : UNRESOLVED_sfixed (minimum(r'high, l'high) downto
mine(r'low, l'low));
variable neg_result : UNRESOLVED_sfixed (minimum(r'high, l'high)+1 downto
mins(r'low, l'low));
begin
if (l'length < 1 or r'length < 1 or
mins(r'low, r'low) /= r'low or mins(l'low, l'low) /= l'low) then
return NASF;
end if;
l_abs := to_ufixed (l);
r_abs := to_ufixed (r);
result := UNRESOLVED_sfixed (remainder (
l => l_abs,
r => r_abs,
round_style => round_style));
neg_result := -result;
if l(l'high) = '1' then
result := neg_result(result'range);
end if;
return result;
end function remainder;
-- modulo
-- ufixed (a downto b) mod ufixed (c downto d)
-- = ufixed (min(a,c) downto min(b, d))
function "mod" (
l, r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return modulo (l, r);
end function "mod";
-- sfixed (a downto b) mod sfixed (c downto d)
-- = sfixed (c downto min(b, d))
function "mod" (
l, r : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed is
begin
return modulo(l, r);
end function "mod";
-- modulo
-- ufixed (a downto b) mod ufixed (c downto d)
-- = ufixed (min(a,c) downto min(b, d))
function modulo (
l, r : UNRESOLVED_ufixed; -- fixed point input
constant round_style : fixed_round_style_type := fixed_round_style;
constant guard_bits : NATURAL := fixed_guard_bits)
return UNRESOLVED_ufixed is
begin
return remainder(l => l,
r => r,
round_style => round_style,
guard_bits => guard_bits);
end function modulo;
-- sfixed (a downto b) mod sfixed (c downto d)
-- = sfixed (c downto min(b, d))
function modulo (
l, r : UNRESOLVED_sfixed; -- fixed point input
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style;
constant guard_bits : NATURAL := fixed_guard_bits)
return UNRESOLVED_sfixed
is
variable l_abs : UNRESOLVED_ufixed (l'range);
variable r_abs : UNRESOLVED_ufixed (r'range);
variable result : UNRESOLVED_sfixed (r'high downto
mine(r'low, l'low));
variable dresult : UNRESOLVED_sfixed (minimum(r'high, l'high)+1 downto
mins(r'low, l'low));
variable dresult_not_zero : BOOLEAN;
begin
if (l'length < 1 or r'length < 1 or
mins(r'low, r'low) /= r'low or mins(l'low, l'low) /= l'low) then
return NASF;
end if;
l_abs := to_ufixed (l);
r_abs := to_ufixed (r);
dresult := "0" & UNRESOLVED_sfixed(remainder (l => l_abs,
r => r_abs,
round_style => round_style));
if (to_s(dresult) = 0) then
dresult_not_zero := false;
else
dresult_not_zero := true;
end if;
if to_x01(l(l'high)) = '1' and to_x01(r(r'high)) = '0'
and dresult_not_zero then
result := resize (arg => r - dresult,
left_index => result'high,
right_index => result'low,
overflow_style => overflow_style,
round_style => round_style);
elsif to_x01(l(l'high)) = '1' and to_x01(r(r'high)) = '1' then
result := resize (arg => -dresult,
left_index => result'high,
right_index => result'low,
overflow_style => overflow_style,
round_style => round_style);
elsif to_x01(l(l'high)) = '0' and to_x01(r(r'high)) = '1'
and dresult_not_zero then
result := resize (arg => dresult + r,
left_index => result'high,
right_index => result'low,
overflow_style => overflow_style,
round_style => round_style);
else
result := resize (arg => dresult,
left_index => result'high,
right_index => result'low,
overflow_style => overflow_style,
round_style => round_style);
end if;
return result;
end function modulo;
-- Procedure for those who need an "accumulator" function
procedure add_carry (
L, R : in UNRESOLVED_ufixed;
c_in : in STD_ULOGIC;
result : out UNRESOLVED_ufixed;
c_out : out STD_ULOGIC) is
constant left_index : INTEGER := maximum(l'high, r'high)+1;
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_UNSIGNED (left_index-right_index
downto 0);
variable result_slv : UNRESOLVED_UNSIGNED (left_index-right_index
downto 0);
variable cx : UNRESOLVED_UNSIGNED (0 downto 0); -- Carry in
begin
if (l'length < 1 or r'length < 1) then
result := NAUF;
c_out := '0';
else
cx (0) := c_in;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_uns (lresize);
rslv := to_uns (rresize);
result_slv := lslv + rslv + cx;
c_out := result_slv(left_index);
result := to_fixed(result_slv (left_index-right_index-1 downto 0),
left_index-1, right_index);
end if;
end procedure add_carry;
procedure add_carry (
L, R : in UNRESOLVED_sfixed;
c_in : in STD_ULOGIC;
result : out UNRESOLVED_sfixed;
c_out : out STD_ULOGIC) is
constant left_index : INTEGER := maximum(l'high, r'high)+1;
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_SIGNED (left_index-right_index
downto 0);
variable result_slv : UNRESOLVED_SIGNED (left_index-right_index
downto 0);
variable cx : UNRESOLVED_SIGNED (1 downto 0); -- Carry in
begin
if (l'length < 1 or r'length < 1) then
result := NASF;
c_out := '0';
else
cx (1) := '0';
cx (0) := c_in;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_s (lresize);
rslv := to_s (rresize);
result_slv := lslv + rslv + cx;
c_out := result_slv(left_index);
result := to_fixed(result_slv (left_index-right_index-1 downto 0),
left_index-1, right_index);
end if;
end procedure add_carry;
-- Scales the result by a power of 2. Width of input = width of output with
-- the decimal point moved.
function scalb (y : UNRESOLVED_ufixed; N : INTEGER)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (y'high+N downto y'low+N);
begin
if y'length < 1 then
return NAUF;
else
result := y;
return result;
end if;
end function scalb;
function scalb (y : UNRESOLVED_ufixed; N : UNRESOLVED_SIGNED)
return UNRESOLVED_ufixed is
begin
return scalb (y => y,
N => to_integer(N));
end function scalb;
function scalb (y : UNRESOLVED_sfixed; N : INTEGER)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (y'high+N downto y'low+N);
begin
if y'length < 1 then
return NASF;
else
result := y;
return result;
end if;
end function scalb;
function scalb (y : UNRESOLVED_sfixed; N : UNRESOLVED_SIGNED)
return UNRESOLVED_sfixed is
begin
return scalb (y => y,
N => to_integer(N));
end function scalb;
function Is_Negative (arg : UNRESOLVED_sfixed) return BOOLEAN is
begin
if to_X01(arg(arg'high)) = '1' then
return true;
else
return false;
end if;
end function Is_Negative;
function find_rightmost (arg : UNRESOLVED_ufixed; y : STD_ULOGIC)
return INTEGER is
begin
for_loop : for i in arg'reverse_range loop
if arg(i) ?= y then
return i;
end if;
end loop;
return arg'high+1; -- return out of bounds 'high
end function find_rightmost;
function find_leftmost (arg : UNRESOLVED_ufixed; y : STD_ULOGIC)
return INTEGER is
begin
for_loop : for i in arg'range loop
if arg(i) ?= y then
return i;
end if;
end loop;
return arg'low-1; -- return out of bounds 'low
end function find_leftmost;
function find_rightmost (arg : UNRESOLVED_sfixed; y : STD_ULOGIC)
return INTEGER is
begin
for_loop : for i in arg'reverse_range loop
if arg(i) ?= y then
return i;
end if;
end loop;
return arg'high+1; -- return out of bounds 'high
end function find_rightmost;
function find_leftmost (arg : UNRESOLVED_sfixed; y : STD_ULOGIC)
return INTEGER is
begin
for_loop : for i in arg'range loop
if arg(i) ?= y then
return i;
end if;
end loop;
return arg'low-1; -- return out of bounds 'low
end function find_leftmost;
function "sll" (ARG : UNRESOLVED_ufixed; COUNT : INTEGER)
return UNRESOLVED_ufixed
is
variable argslv : UNRESOLVED_UNSIGNED (arg'length-1 downto 0);
variable result : UNRESOLVED_ufixed (arg'range);
begin
argslv := to_uns (arg);
argslv := argslv sll COUNT;
result := to_fixed (argslv, result'high, result'low);
return result;
end function "sll";
function "srl" (ARG : UNRESOLVED_ufixed; COUNT : INTEGER)
return UNRESOLVED_ufixed
is
variable argslv : UNRESOLVED_UNSIGNED (arg'length-1 downto 0);
variable result : UNRESOLVED_ufixed (arg'range);
begin
argslv := to_uns (arg);
argslv := argslv srl COUNT;
result := to_fixed (argslv, result'high, result'low);
return result;
end function "srl";
function "rol" (ARG : UNRESOLVED_ufixed; COUNT : INTEGER)
return UNRESOLVED_ufixed
is
variable argslv : UNRESOLVED_UNSIGNED (arg'length-1 downto 0);
variable result : UNRESOLVED_ufixed (arg'range);
begin
argslv := to_uns (arg);
argslv := argslv rol COUNT;
result := to_fixed (argslv, result'high, result'low);
return result;
end function "rol";
function "ror" (ARG : UNRESOLVED_ufixed; COUNT : INTEGER)
return UNRESOLVED_ufixed
is
variable argslv : UNRESOLVED_UNSIGNED (arg'length-1 downto 0);
variable result : UNRESOLVED_ufixed (arg'range);
begin
argslv := to_uns (arg);
argslv := argslv ror COUNT;
result := to_fixed (argslv, result'high, result'low);
return result;
end function "ror";
function "sla" (ARG : UNRESOLVED_ufixed; COUNT : INTEGER)
return UNRESOLVED_ufixed
is
variable argslv : UNRESOLVED_UNSIGNED (arg'length-1 downto 0);
variable result : UNRESOLVED_ufixed (arg'range);
begin
argslv := to_uns (arg);
-- Arithmetic shift on an unsigned is a logical shift
argslv := argslv sll COUNT;
result := to_fixed (argslv, result'high, result'low);
return result;
end function "sla";
function "sra" (ARG : UNRESOLVED_ufixed; COUNT : INTEGER)
return UNRESOLVED_ufixed
is
variable argslv : UNRESOLVED_UNSIGNED (arg'length-1 downto 0);
variable result : UNRESOLVED_ufixed (arg'range);
begin
argslv := to_uns (arg);
-- Arithmetic shift on an unsigned is a logical shift
argslv := argslv srl COUNT;
result := to_fixed (argslv, result'high, result'low);
return result;
end function "sra";
function "sll" (ARG : UNRESOLVED_sfixed; COUNT : INTEGER)
return UNRESOLVED_sfixed
is
variable argslv : UNRESOLVED_SIGNED (arg'length-1 downto 0);
variable result : UNRESOLVED_sfixed (arg'range);
begin
argslv := to_s (arg);
argslv := argslv sll COUNT;
result := to_fixed (argslv, result'high, result'low);
return result;
end function "sll";
function "srl" (ARG : UNRESOLVED_sfixed; COUNT : INTEGER)
return UNRESOLVED_sfixed
is
variable argslv : UNRESOLVED_SIGNED (arg'length-1 downto 0);
variable result : UNRESOLVED_sfixed (arg'range);
begin
argslv := to_s (arg);
argslv := argslv srl COUNT;
result := to_fixed (argslv, result'high, result'low);
return result;
end function "srl";
function "rol" (ARG : UNRESOLVED_sfixed; COUNT : INTEGER)
return UNRESOLVED_sfixed
is
variable argslv : UNRESOLVED_SIGNED (arg'length-1 downto 0);
variable result : UNRESOLVED_sfixed (arg'range);
begin
argslv := to_s (arg);
argslv := argslv rol COUNT;
result := to_fixed (argslv, result'high, result'low);
return result;
end function "rol";
function "ror" (ARG : UNRESOLVED_sfixed; COUNT : INTEGER)
return UNRESOLVED_sfixed
is
variable argslv : UNRESOLVED_SIGNED (arg'length-1 downto 0);
variable result : UNRESOLVED_sfixed (arg'range);
begin
argslv := to_s (arg);
argslv := argslv ror COUNT;
result := to_fixed (argslv, result'high, result'low);
return result;
end function "ror";
function "sla" (ARG : UNRESOLVED_sfixed; COUNT : INTEGER)
return UNRESOLVED_sfixed
is
variable argslv : UNRESOLVED_SIGNED (arg'length-1 downto 0);
variable result : UNRESOLVED_sfixed (arg'range);
begin
argslv := to_s (arg);
if COUNT > 0 then
-- Arithmetic shift left on a 2's complement number is a logic shift
argslv := argslv sll COUNT;
else
argslv := argslv sra -COUNT;
end if;
result := to_fixed (argslv, result'high, result'low);
return result;
end function "sla";
function "sra" (ARG : UNRESOLVED_sfixed; COUNT : INTEGER)
return UNRESOLVED_sfixed
is
variable argslv : UNRESOLVED_SIGNED (arg'length-1 downto 0);
variable result : UNRESOLVED_sfixed (arg'range);
begin
argslv := to_s (arg);
if COUNT > 0 then
argslv := argslv sra COUNT;
else
-- Arithmetic shift left on a 2's complement number is a logic shift
argslv := argslv sll -COUNT;
end if;
result := to_fixed (argslv, result'high, result'low);
return result;
end function "sra";
-- Because some people want the older functions.
function SHIFT_LEFT (ARG : UNRESOLVED_ufixed; COUNT : NATURAL)
return UNRESOLVED_ufixed is
begin
if (ARG'length < 1) then
return NAUF;
end if;
return ARG sla COUNT;
end function SHIFT_LEFT;
function SHIFT_RIGHT (ARG : UNRESOLVED_ufixed; COUNT : NATURAL)
return UNRESOLVED_ufixed is
begin
if (ARG'length < 1) then
return NAUF;
end if;
return ARG sra COUNT;
end function SHIFT_RIGHT;
function SHIFT_LEFT (ARG : UNRESOLVED_sfixed; COUNT : NATURAL)
return UNRESOLVED_sfixed is
begin
if (ARG'length < 1) then
return NASF;
end if;
return ARG sla COUNT;
end function SHIFT_LEFT;
function SHIFT_RIGHT (ARG : UNRESOLVED_sfixed; COUNT : NATURAL)
return UNRESOLVED_sfixed is
begin
if (ARG'length < 1) then
return NASF;
end if;
return ARG sra COUNT;
end function SHIFT_RIGHT;
----------------------------------------------------------------------------
-- logical functions
----------------------------------------------------------------------------
function "not" (L : UNRESOLVED_ufixed) return UNRESOLVED_ufixed is
variable RESULT : STD_ULOGIC_VECTOR(L'length-1 downto 0); -- force downto
begin
RESULT := not to_sulv(L);
return to_ufixed(RESULT, L'high, L'low);
end function "not";
function "and" (L, R : UNRESOLVED_ufixed) return UNRESOLVED_ufixed is
variable RESULT : STD_ULOGIC_VECTOR(L'length-1 downto 0); -- force downto
begin
if (L'high = R'high and L'low = R'low) then
RESULT := to_sulv(L) and to_sulv(R);
else
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """and"": Range error L'RANGE /= R'RANGE"
severity warning;
RESULT := (others => 'X');
end if;
return to_ufixed(RESULT, L'high, L'low);
end function "and";
function "or" (L, R : UNRESOLVED_ufixed) return UNRESOLVED_ufixed is
variable RESULT : STD_ULOGIC_VECTOR(L'length-1 downto 0); -- force downto
begin
if (L'high = R'high and L'low = R'low) then
RESULT := to_sulv(L) or to_sulv(R);
else
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """or"": Range error L'RANGE /= R'RANGE"
severity warning;
RESULT := (others => 'X');
end if;
return to_ufixed(RESULT, L'high, L'low);
end function "or";
function "nand" (L, R : UNRESOLVED_ufixed) return UNRESOLVED_ufixed is
variable RESULT : STD_ULOGIC_VECTOR(L'length-1 downto 0); -- force downto
begin
if (L'high = R'high and L'low = R'low) then
RESULT := to_sulv(L) nand to_sulv(R);
else
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """nand"": Range error L'RANGE /= R'RANGE"
severity warning;
RESULT := (others => 'X');
end if;
return to_ufixed(RESULT, L'high, L'low);
end function "nand";
function "nor" (L, R : UNRESOLVED_ufixed) return UNRESOLVED_ufixed is
variable RESULT : STD_ULOGIC_VECTOR(L'length-1 downto 0); -- force downto
begin
if (L'high = R'high and L'low = R'low) then
RESULT := to_sulv(L) nor to_sulv(R);
else
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """nor"": Range error L'RANGE /= R'RANGE"
severity warning;
RESULT := (others => 'X');
end if;
return to_ufixed(RESULT, L'high, L'low);
end function "nor";
function "xor" (L, R : UNRESOLVED_ufixed) return UNRESOLVED_ufixed is
variable RESULT : STD_ULOGIC_VECTOR(L'length-1 downto 0); -- force downto
begin
if (L'high = R'high and L'low = R'low) then
RESULT := to_sulv(L) xor to_sulv(R);
else
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """xor"": Range error L'RANGE /= R'RANGE"
severity warning;
RESULT := (others => 'X');
end if;
return to_ufixed(RESULT, L'high, L'low);
end function "xor";
function "xnor" (L, R : UNRESOLVED_ufixed) return UNRESOLVED_ufixed is
variable RESULT : STD_ULOGIC_VECTOR(L'length-1 downto 0); -- force downto
begin
if (L'high = R'high and L'low = R'low) then
RESULT := to_sulv(L) xnor to_sulv(R);
else
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """xnor"": Range error L'RANGE /= R'RANGE"
severity warning;
RESULT := (others => 'X');
end if;
return to_ufixed(RESULT, L'high, L'low);
end function "xnor";
function "not" (L : UNRESOLVED_sfixed) return UNRESOLVED_sfixed is
variable RESULT : STD_ULOGIC_VECTOR(L'length-1 downto 0); -- force downto
begin
RESULT := not to_sulv(L);
return to_sfixed(RESULT, L'high, L'low);
end function "not";
function "and" (L, R : UNRESOLVED_sfixed) return UNRESOLVED_sfixed is
variable RESULT : STD_ULOGIC_VECTOR(L'length-1 downto 0); -- force downto
begin
if (L'high = R'high and L'low = R'low) then
RESULT := to_sulv(L) and to_sulv(R);
else
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """and"": Range error L'RANGE /= R'RANGE"
severity warning;
RESULT := (others => 'X');
end if;
return to_sfixed(RESULT, L'high, L'low);
end function "and";
function "or" (L, R : UNRESOLVED_sfixed) return UNRESOLVED_sfixed is
variable RESULT : STD_ULOGIC_VECTOR(L'length-1 downto 0); -- force downto
begin
if (L'high = R'high and L'low = R'low) then
RESULT := to_sulv(L) or to_sulv(R);
else
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """or"": Range error L'RANGE /= R'RANGE"
severity warning;
RESULT := (others => 'X');
end if;
return to_sfixed(RESULT, L'high, L'low);
end function "or";
function "nand" (L, R : UNRESOLVED_sfixed) return UNRESOLVED_sfixed is
variable RESULT : STD_ULOGIC_VECTOR(L'length-1 downto 0); -- force downto
begin
if (L'high = R'high and L'low = R'low) then
RESULT := to_sulv(L) nand to_sulv(R);
else
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """nand"": Range error L'RANGE /= R'RANGE"
severity warning;
RESULT := (others => 'X');
end if;
return to_sfixed(RESULT, L'high, L'low);
end function "nand";
function "nor" (L, R : UNRESOLVED_sfixed) return UNRESOLVED_sfixed is
variable RESULT : STD_ULOGIC_VECTOR(L'length-1 downto 0); -- force downto
begin
if (L'high = R'high and L'low = R'low) then
RESULT := to_sulv(L) nor to_sulv(R);
else
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """nor"": Range error L'RANGE /= R'RANGE"
severity warning;
RESULT := (others => 'X');
end if;
return to_sfixed(RESULT, L'high, L'low);
end function "nor";
function "xor" (L, R : UNRESOLVED_sfixed) return UNRESOLVED_sfixed is
variable RESULT : STD_ULOGIC_VECTOR(L'length-1 downto 0); -- force downto
begin
if (L'high = R'high and L'low = R'low) then
RESULT := to_sulv(L) xor to_sulv(R);
else
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """xor"": Range error L'RANGE /= R'RANGE"
severity warning;
RESULT := (others => 'X');
end if;
return to_sfixed(RESULT, L'high, L'low);
end function "xor";
function "xnor" (L, R : UNRESOLVED_sfixed) return UNRESOLVED_sfixed is
variable RESULT : STD_ULOGIC_VECTOR(L'length-1 downto 0); -- force downto
begin
if (L'high = R'high and L'low = R'low) then
RESULT := to_sulv(L) xnor to_sulv(R);
else
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """xnor"": Range error L'RANGE /= R'RANGE"
severity warning;
RESULT := (others => 'X');
end if;
return to_sfixed(RESULT, L'high, L'low);
end function "xnor";
-- Vector and std_ulogic functions, same as functions in numeric_std
function "and" (L : STD_ULOGIC; R : UNRESOLVED_ufixed)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (R'range);
begin
for i in result'range loop
result(i) := L and R(i);
end loop;
return result;
end function "and";
function "and" (L : UNRESOLVED_ufixed; R : STD_ULOGIC)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (L'range);
begin
for i in result'range loop
result(i) := L(i) and R;
end loop;
return result;
end function "and";
function "or" (L : STD_ULOGIC; R : UNRESOLVED_ufixed)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (R'range);
begin
for i in result'range loop
result(i) := L or R(i);
end loop;
return result;
end function "or";
function "or" (L : UNRESOLVED_ufixed; R : STD_ULOGIC)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (L'range);
begin
for i in result'range loop
result(i) := L(i) or R;
end loop;
return result;
end function "or";
function "nand" (L : STD_ULOGIC; R : UNRESOLVED_ufixed)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (R'range);
begin
for i in result'range loop
result(i) := L nand R(i);
end loop;
return result;
end function "nand";
function "nand" (L : UNRESOLVED_ufixed; R : STD_ULOGIC)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (L'range);
begin
for i in result'range loop
result(i) := L(i) nand R;
end loop;
return result;
end function "nand";
function "nor" (L : STD_ULOGIC; R : UNRESOLVED_ufixed)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (R'range);
begin
for i in result'range loop
result(i) := L nor R(i);
end loop;
return result;
end function "nor";
function "nor" (L : UNRESOLVED_ufixed; R : STD_ULOGIC)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (L'range);
begin
for i in result'range loop
result(i) := L(i) nor R;
end loop;
return result;
end function "nor";
function "xor" (L : STD_ULOGIC; R : UNRESOLVED_ufixed)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (R'range);
begin
for i in result'range loop
result(i) := L xor R(i);
end loop;
return result;
end function "xor";
function "xor" (L : UNRESOLVED_ufixed; R : STD_ULOGIC)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (L'range);
begin
for i in result'range loop
result(i) := L(i) xor R;
end loop;
return result;
end function "xor";
function "xnor" (L : STD_ULOGIC; R : UNRESOLVED_ufixed)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (R'range);
begin
for i in result'range loop
result(i) := L xnor R(i);
end loop;
return result;
end function "xnor";
function "xnor" (L : UNRESOLVED_ufixed; R : STD_ULOGIC)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (L'range);
begin
for i in result'range loop
result(i) := L(i) xnor R;
end loop;
return result;
end function "xnor";
function "and" (L : STD_ULOGIC; R : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (R'range);
begin
for i in result'range loop
result(i) := L and R(i);
end loop;
return result;
end function "and";
function "and" (L : UNRESOLVED_sfixed; R : STD_ULOGIC)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (L'range);
begin
for i in result'range loop
result(i) := L(i) and R;
end loop;
return result;
end function "and";
function "or" (L : STD_ULOGIC; R : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (R'range);
begin
for i in result'range loop
result(i) := L or R(i);
end loop;
return result;
end function "or";
function "or" (L : UNRESOLVED_sfixed; R : STD_ULOGIC)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (L'range);
begin
for i in result'range loop
result(i) := L(i) or R;
end loop;
return result;
end function "or";
function "nand" (L : STD_ULOGIC; R : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (R'range);
begin
for i in result'range loop
result(i) := L nand R(i);
end loop;
return result;
end function "nand";
function "nand" (L : UNRESOLVED_sfixed; R : STD_ULOGIC)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (L'range);
begin
for i in result'range loop
result(i) := L(i) nand R;
end loop;
return result;
end function "nand";
function "nor" (L : STD_ULOGIC; R : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (R'range);
begin
for i in result'range loop
result(i) := L nor R(i);
end loop;
return result;
end function "nor";
function "nor" (L : UNRESOLVED_sfixed; R : STD_ULOGIC)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (L'range);
begin
for i in result'range loop
result(i) := L(i) nor R;
end loop;
return result;
end function "nor";
function "xor" (L : STD_ULOGIC; R : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (R'range);
begin
for i in result'range loop
result(i) := L xor R(i);
end loop;
return result;
end function "xor";
function "xor" (L : UNRESOLVED_sfixed; R : STD_ULOGIC)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (L'range);
begin
for i in result'range loop
result(i) := L(i) xor R;
end loop;
return result;
end function "xor";
function "xnor" (L : STD_ULOGIC; R : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (R'range);
begin
for i in result'range loop
result(i) := L xnor R(i);
end loop;
return result;
end function "xnor";
function "xnor" (L : UNRESOLVED_sfixed; R : STD_ULOGIC)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (L'range);
begin
for i in result'range loop
result(i) := L(i) xnor R;
end loop;
return result;
end function "xnor";
-- Reduction operators
function "and" (l : UNRESOLVED_ufixed) return STD_ULOGIC is
begin
return and to_sulv(l);
end function "and";
function "nand" (l : UNRESOLVED_ufixed) return STD_ULOGIC is
begin
return nand to_sulv(l);
end function "nand";
function "or" (l : UNRESOLVED_ufixed) return STD_ULOGIC is
begin
return or to_sulv(l);
end function "or";
function "nor" (l : UNRESOLVED_ufixed) return STD_ULOGIC is
begin
return nor to_sulv(l);
end function "nor";
function "xor" (l : UNRESOLVED_ufixed) return STD_ULOGIC is
begin
return xor to_sulv(l);
end function "xor";
function "xnor" (l : UNRESOLVED_ufixed) return STD_ULOGIC is
begin
return xnor to_sulv(l);
end function "xnor";
function "and" (l : UNRESOLVED_sfixed) return STD_ULOGIC is
begin
return and to_sulv(l);
end function "and";
function "nand" (l : UNRESOLVED_sfixed) return STD_ULOGIC is
begin
return nand to_sulv(l);
end function "nand";
function "or" (l : UNRESOLVED_sfixed) return STD_ULOGIC is
begin
return or to_sulv(l);
end function "or";
function "nor" (l : UNRESOLVED_sfixed) return STD_ULOGIC is
begin
return nor to_sulv(l);
end function "nor";
function "xor" (l : UNRESOLVED_sfixed) return STD_ULOGIC is
begin
return xor to_sulv(l);
end function "xor";
function "xnor" (l : UNRESOLVED_sfixed) return STD_ULOGIC is
begin
return xnor to_sulv(l);
end function "xnor";
-- End reduction operators
function "?=" (L, R : UNRESOLVED_ufixed) return STD_ULOGIC is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_UNSIGNED (lresize'length-1 downto 0);
begin -- ?=
if ((L'length < 1) or (R'length < 1)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """?="": null detected, returning X"
severity warning;
return 'X';
else
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_uns (lresize);
rslv := to_uns (rresize);
return lslv ?= rslv;
end if;
end function "?=";
function "?/=" (L, R : UNRESOLVED_ufixed) return STD_ULOGIC is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_UNSIGNED (lresize'length-1 downto 0);
begin -- ?/=
if ((L'length < 1) or (R'length < 1)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """?/="": null detected, returning X"
severity warning;
return 'X';
else
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_uns (lresize);
rslv := to_uns (rresize);
return lslv ?/= rslv;
end if;
end function "?/=";
function "?>" (L, R : UNRESOLVED_ufixed) return STD_ULOGIC is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_UNSIGNED (lresize'length-1 downto 0);
begin -- ?>
if ((l'length < 1) or (r'length < 1)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """?>"": null detected, returning X"
severity warning;
return 'X';
else
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_uns (lresize);
rslv := to_uns (rresize);
return lslv ?> rslv;
end if;
end function "?>";
function "?>=" (L, R : UNRESOLVED_ufixed) return STD_ULOGIC is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_UNSIGNED (lresize'length-1 downto 0);
begin -- ?>=
if ((l'length < 1) or (r'length < 1)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """?>="": null detected, returning X"
severity warning;
return 'X';
else
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_uns (lresize);
rslv := to_uns (rresize);
return lslv ?>= rslv;
end if;
end function "?>=";
function "?<" (L, R : UNRESOLVED_ufixed) return STD_ULOGIC is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_UNSIGNED (lresize'length-1 downto 0);
begin -- ?<
if ((l'length < 1) or (r'length < 1)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """?<"": null detected, returning X"
severity warning;
return 'X';
else
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_uns (lresize);
rslv := to_uns (rresize);
return lslv ?< rslv;
end if;
end function "?<";
function "?<=" (L, R : UNRESOLVED_ufixed) return STD_ULOGIC is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_UNSIGNED (lresize'length-1 downto 0);
begin -- ?<=
if ((l'length < 1) or (r'length < 1)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """?<="": null detected, returning X"
severity warning;
return 'X';
else
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_uns (lresize);
rslv := to_uns (rresize);
return lslv ?<= rslv;
end if;
end function "?<=";
function "?=" (L, R : UNRESOLVED_sfixed) return STD_ULOGIC is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_SIGNED (lresize'length-1 downto 0);
begin -- ?=
if ((L'length < 1) or (R'length < 1)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """?="": null detected, returning X"
severity warning;
return 'X';
else
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_s (lresize);
rslv := to_s (rresize);
return lslv ?= rslv;
end if;
end function "?=";
function "?/=" (L, R : UNRESOLVED_sfixed) return STD_ULOGIC is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_SIGNED (lresize'length-1 downto 0);
begin -- ?/=
if ((L'length < 1) or (R'length < 1)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """?/="": null detected, returning X"
severity warning;
return 'X';
else
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_s (lresize);
rslv := to_s (rresize);
return lslv ?/= rslv;
end if;
end function "?/=";
function "?>" (L, R : UNRESOLVED_sfixed) return STD_ULOGIC is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_SIGNED (lresize'length-1 downto 0);
begin -- ?>
if ((l'length < 1) or (r'length < 1)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """?>"": null detected, returning X"
severity warning;
return 'X';
else
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_s (lresize);
rslv := to_s (rresize);
return lslv ?> rslv;
end if;
end function "?>";
function "?>=" (L, R : UNRESOLVED_sfixed) return STD_ULOGIC is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_SIGNED (lresize'length-1 downto 0);
begin -- ?>=
if ((l'length < 1) or (r'length < 1)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """?>="": null detected, returning X"
severity warning;
return 'X';
else
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_s (lresize);
rslv := to_s (rresize);
return lslv ?>= rslv;
end if;
end function "?>=";
function "?<" (L, R : UNRESOLVED_sfixed) return STD_ULOGIC is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_SIGNED (lresize'length-1 downto 0);
begin -- ?<
if ((l'length < 1) or (r'length < 1)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """?<"": null detected, returning X"
severity warning;
return 'X';
else
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_s (lresize);
rslv := to_s (rresize);
return lslv ?< rslv;
end if;
end function "?<";
function "?<=" (L, R : UNRESOLVED_sfixed) return STD_ULOGIC is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_SIGNED (lresize'length-1 downto 0);
begin -- ?<=
if ((l'length < 1) or (r'length < 1)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """?<="": null detected, returning X"
severity warning;
return 'X';
else
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_s (lresize);
rslv := to_s (rresize);
return lslv ?<= rslv;
end if;
end function "?<=";
-- Match function, similar to "std_match" from numeric_std
function std_match (L, R : UNRESOLVED_ufixed) return BOOLEAN is
begin
if (L'high = R'high and L'low = R'low) then
return std_match(to_sulv(L), to_sulv(R));
else
assert NO_WARNING
report fixed_generic_pkg'instance_name
& "STD_MATCH: L'RANGE /= R'RANGE, returning FALSE"
severity warning;
return false;
end if;
end function std_match;
function std_match (L, R : UNRESOLVED_sfixed) return BOOLEAN is
begin
if (L'high = R'high and L'low = R'low) then
return std_match(to_sulv(L), to_sulv(R));
else
assert NO_WARNING
report fixed_generic_pkg'instance_name
& "STD_MATCH: L'RANGE /= R'RANGE, returning FALSE"
severity warning;
return false;
end if;
end function std_match;
-- compare functions
function "=" (
l, r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN
is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_UNSIGNED (lresize'length-1 downto 0);
begin
if (l'length < 1 or r'length < 1) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """="": null argument detected, returning FALSE"
severity warning;
return false;
elsif (Is_X(l) or Is_X(r)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """="": metavalue detected, returning FALSE"
severity warning;
return false;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_uns (lresize);
rslv := to_uns (rresize);
return lslv = rslv;
end function "=";
function "=" (
l, r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN
is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_SIGNED (lresize'length-1 downto 0);
begin
if (l'length < 1 or r'length < 1) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """="": null argument detected, returning FALSE"
severity warning;
return false;
elsif (Is_X(l) or Is_X(r)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """="": metavalue detected, returning FALSE"
severity warning;
return false;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_s (lresize);
rslv := to_s (rresize);
return lslv = rslv;
end function "=";
function "/=" (
l, r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN
is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_UNSIGNED (lresize'length-1 downto 0);
begin
if (l'length < 1 or r'length < 1) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """/="": null argument detected, returning TRUE"
severity warning;
return true;
elsif (Is_X(l) or Is_X(r)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """/="": metavalue detected, returning TRUE"
severity warning;
return true;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_uns (lresize);
rslv := to_uns (rresize);
return lslv /= rslv;
end function "/=";
function "/=" (
l, r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN
is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_SIGNED (lresize'length-1 downto 0);
begin
if (l'length < 1 or r'length < 1) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """/="": null argument detected, returning TRUE"
severity warning;
return true;
elsif (Is_X(l) or Is_X(r)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """/="": metavalue detected, returning TRUE"
severity warning;
return true;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_s (lresize);
rslv := to_s (rresize);
return lslv /= rslv;
end function "/=";
function ">" (
l, r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN
is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_UNSIGNED (lresize'length-1 downto 0);
begin
if (l'length < 1 or r'length < 1) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """>"": null argument detected, returning FALSE"
severity warning;
return false;
elsif (Is_X(l) or Is_X(r)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """>"": metavalue detected, returning FALSE"
severity warning;
return false;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_uns (lresize);
rslv := to_uns (rresize);
return lslv > rslv;
end function ">";
function ">" (
l, r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN
is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_SIGNED (lresize'length-1 downto 0);
begin
if (l'length < 1 or r'length < 1) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """>"": null argument detected, returning FALSE"
severity warning;
return false;
elsif (Is_X(l) or Is_X(r)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """>"": metavalue detected, returning FALSE"
severity warning;
return false;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_s (lresize);
rslv := to_s (rresize);
return lslv > rslv;
end function ">";
function "<" (
l, r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN
is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_UNSIGNED (lresize'length-1 downto 0);
begin
if (l'length < 1 or r'length < 1) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """<"": null argument detected, returning FALSE"
severity warning;
return false;
elsif (Is_X(l) or Is_X(r)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """<"": metavalue detected, returning FALSE"
severity warning;
return false;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_uns (lresize);
rslv := to_uns (rresize);
return lslv < rslv;
end function "<";
function "<" (
l, r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN
is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_SIGNED (lresize'length-1 downto 0);
begin
if (l'length < 1 or r'length < 1) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """<"": null argument detected, returning FALSE"
severity warning;
return false;
elsif (Is_X(l) or Is_X(r)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """<"": metavalue detected, returning FALSE"
severity warning;
return false;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_s (lresize);
rslv := to_s (rresize);
return lslv < rslv;
end function "<";
function ">=" (
l, r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN
is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_UNSIGNED (lresize'length-1 downto 0);
begin
if (l'length < 1 or r'length < 1) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """>="": null argument detected, returning FALSE"
severity warning;
return false;
elsif (Is_X(l) or Is_X(r)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """>="": metavalue detected, returning FALSE"
severity warning;
return false;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_uns (lresize);
rslv := to_uns (rresize);
return lslv >= rslv;
end function ">=";
function ">=" (
l, r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN
is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_SIGNED (lresize'length-1 downto 0);
begin
if (l'length < 1 or r'length < 1) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """>="": null argument detected, returning FALSE"
severity warning;
return false;
elsif (Is_X(l) or Is_X(r)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """>="": metavalue detected, returning FALSE"
severity warning;
return false;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_s (lresize);
rslv := to_s (rresize);
return lslv >= rslv;
end function ">=";
function "<=" (
l, r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN
is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_UNSIGNED (lresize'length-1 downto 0);
begin
if (l'length < 1 or r'length < 1) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """<="": null argument detected, returning FALSE"
severity warning;
return false;
elsif (Is_X(l) or Is_X(r)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """<="": metavalue detected, returning FALSE"
severity warning;
return false;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_uns (lresize);
rslv := to_uns (rresize);
return lslv <= rslv;
end function "<=";
function "<=" (
l, r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN
is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
variable lslv, rslv : UNRESOLVED_SIGNED (lresize'length-1 downto 0);
begin
if (l'length < 1 or r'length < 1) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """<="": null argument detected, returning FALSE"
severity warning;
return false;
elsif (Is_X(l) or Is_X(r)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& """<="": metavalue detected, returning FALSE"
severity warning;
return false;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
lslv := to_s (lresize);
rslv := to_s (rresize);
return lslv <= rslv;
end function "<=";
-- overloads of the default maximum and minimum functions
function maximum (l, r : UNRESOLVED_ufixed) return UNRESOLVED_ufixed is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
begin
if (l'length < 1 or r'length < 1) then
return NAUF;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
return to_fixed(maximum(to_uns(lresize), to_uns(rresize)),
left_index, right_index);
end function maximum;
function maximum (l, r : UNRESOLVED_sfixed) return UNRESOLVED_sfixed is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
begin
if (l'length < 1 or r'length < 1) then
return NASF;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
return to_fixed(maximum(to_s(lresize), to_s(rresize)),
left_index, right_index);
end function maximum;
function minimum (l, r : UNRESOLVED_ufixed) return UNRESOLVED_ufixed is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_ufixed (left_index downto right_index);
begin
if (l'length < 1 or r'length < 1) then
return NAUF;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
return to_fixed(minimum(to_uns(lresize), to_uns(rresize)),
left_index, right_index);
end function minimum;
function minimum (l, r : UNRESOLVED_sfixed) return UNRESOLVED_sfixed is
constant left_index : INTEGER := maximum(l'high, r'high);
constant right_index : INTEGER := mins(l'low, r'low);
variable lresize, rresize : UNRESOLVED_sfixed (left_index downto right_index);
begin
if (l'length < 1 or r'length < 1) then
return NASF;
end if;
lresize := resize (l, left_index, right_index);
rresize := resize (r, left_index, right_index);
return to_fixed(minimum(to_s(lresize), to_s(rresize)),
left_index, right_index);
end function minimum;
function to_ufixed (
arg : NATURAL; -- integer
constant left_index : INTEGER; -- left index (high index)
constant right_index : INTEGER := 0; -- right index
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_ufixed
is
constant fw : INTEGER := mins (right_index, right_index); -- catch literals
variable result : UNRESOLVED_ufixed (left_index downto fw);
variable sresult : UNRESOLVED_ufixed (left_index downto 0) :=
(others => '0'); -- integer portion
variable argx : NATURAL; -- internal version of arg
begin
if (result'length < 1) then
return NAUF;
end if;
if arg /= 0 then
argx := arg;
for I in 0 to sresult'left loop
if (argx mod 2) = 0 then
sresult(I) := '0';
else
sresult(I) := '1';
end if;
argx := argx/2;
end loop;
if argx /= 0 then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& "TO_UFIXED(NATURAL): vector truncated"
severity warning;
if overflow_style = fixed_saturate then
return saturate (left_index, right_index);
end if;
end if;
result := resize (arg => sresult,
left_index => left_index,
right_index => right_index,
round_style => round_style,
overflow_style => overflow_style);
else
result := (others => '0');
end if;
return result;
end function to_ufixed;
function to_sfixed (
arg : INTEGER; -- integer
constant left_index : INTEGER; -- left index (high index)
constant right_index : INTEGER := 0; -- right index
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_sfixed
is
constant fw : INTEGER := mins (right_index, right_index); -- catch literals
variable result : UNRESOLVED_sfixed (left_index downto fw);
variable sresult : UNRESOLVED_sfixed (left_index downto 0) :=
(others => '0'); -- integer portion
variable argx : INTEGER; -- internal version of arg
variable sign : STD_ULOGIC; -- sign of input
begin
if (result'length < 1) then -- null range
return NASF;
end if;
if arg /= 0 then
if (arg < 0) then
sign := '1';
argx := -(arg + 1);
else
sign := '0';
argx := arg;
end if;
for I in 0 to sresult'left loop
if (argx mod 2) = 0 then
sresult(I) := sign;
else
sresult(I) := not sign;
end if;
argx := argx/2;
end loop;
if argx /= 0 or left_index < 0 or sign /= sresult(sresult'left) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& "TO_SFIXED(INTEGER): vector truncated"
severity warning;
if overflow_style = fixed_saturate then -- saturate
if arg < 0 then
result := not saturate (result'high, result'low); -- underflow
else
result := saturate (result'high, result'low); -- overflow
end if;
return result;
end if;
end if;
result := resize (arg => sresult,
left_index => left_index,
right_index => right_index,
round_style => round_style,
overflow_style => overflow_style);
else
result := (others => '0');
end if;
return result;
end function to_sfixed;
function to_ufixed (
arg : REAL; -- real
constant left_index : INTEGER; -- left index (high index)
constant right_index : INTEGER; -- right index
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style;
constant guard_bits : NATURAL := fixed_guard_bits) -- # of guard bits
return UNRESOLVED_ufixed
is
constant fw : INTEGER := mins (right_index, right_index); -- catch literals
variable result : UNRESOLVED_ufixed (left_index downto fw) :=
(others => '0');
variable Xresult : UNRESOLVED_ufixed (left_index downto
fw-guard_bits) :=
(others => '0');
variable presult : REAL;
begin
-- If negative or null range, return.
if (left_index < fw) then
return NAUF;
end if;
if (arg < 0.0) then
report fixed_generic_pkg'instance_name
& "TO_UFIXED: Negative argument passed "
& REAL'image(arg) severity error;
return result;
end if;
presult := arg;
if presult >= (2.0**(left_index+1)) then
assert NO_WARNING report fixed_generic_pkg'instance_name
& "TO_UFIXED(REAL): vector truncated"
severity warning;
if overflow_style = fixed_wrap then
presult := presult mod (2.0**(left_index+1)); -- wrap
else
return saturate (result'high, result'low);
end if;
end if;
for i in Xresult'range loop
if presult >= 2.0**i then
Xresult(i) := '1';
presult := presult - 2.0**i;
else
Xresult(i) := '0';
end if;
end loop;
if guard_bits > 0 and round_style = fixed_round then
result := round_fixed (arg => Xresult (left_index
downto right_index),
remainder => Xresult (right_index-1 downto
right_index-guard_bits),
overflow_style => overflow_style);
else
result := Xresult (result'range);
end if;
return result;
end function to_ufixed;
function to_sfixed (
arg : REAL; -- real
constant left_index : INTEGER; -- left index (high index)
constant right_index : INTEGER; -- right index
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style;
constant guard_bits : NATURAL := fixed_guard_bits) -- # of guard bits
return UNRESOLVED_sfixed
is
constant fw : INTEGER := mins (right_index, right_index); -- catch literals
variable result : UNRESOLVED_sfixed (left_index downto fw) :=
(others => '0');
variable Xresult : UNRESOLVED_sfixed (left_index+1 downto fw-guard_bits) :=
(others => '0');
variable presult : REAL;
begin
if (left_index < fw) then -- null range
return NASF;
end if;
if (arg >= (2.0**left_index) or arg < -(2.0**left_index)) then
assert NO_WARNING report fixed_generic_pkg'instance_name
& "TO_SFIXED(REAL): vector truncated"
severity warning;
if overflow_style = fixed_saturate then
if arg < 0.0 then -- saturate
result := not saturate (result'high, result'low); -- underflow
else
result := saturate (result'high, result'low); -- overflow
end if;
return result;
else
presult := abs(arg) mod (2.0**(left_index+1)); -- wrap
end if;
else
presult := abs(arg);
end if;
for i in Xresult'range loop
if presult >= 2.0**i then
Xresult(i) := '1';
presult := presult - 2.0**i;
else
Xresult(i) := '0';
end if;
end loop;
if arg < 0.0 then
Xresult := to_fixed(-to_s(Xresult), Xresult'high, Xresult'low);
end if;
if guard_bits > 0 and round_style = fixed_round then
result := round_fixed (arg => Xresult (left_index
downto right_index),
remainder => Xresult (right_index-1 downto
right_index-guard_bits),
overflow_style => overflow_style);
else
result := Xresult (result'range);
end if;
return result;
end function to_sfixed;
function to_ufixed (
arg : UNRESOLVED_UNSIGNED; -- unsigned
constant left_index : INTEGER; -- left index (high index)
constant right_index : INTEGER := 0; -- right index
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_ufixed
is
constant ARG_LEFT : INTEGER := ARG'length-1;
alias XARG : UNRESOLVED_UNSIGNED(ARG_LEFT downto 0) is ARG;
variable result : UNRESOLVED_ufixed (left_index downto right_index);
begin
if arg'length < 1 or (left_index < right_index) then
return NAUF;
end if;
result := resize (arg => UNRESOLVED_ufixed (XARG),
left_index => left_index,
right_index => right_index,
round_style => round_style,
overflow_style => overflow_style);
return result;
end function to_ufixed;
-- converted version
function to_ufixed (
arg : UNRESOLVED_UNSIGNED) -- unsigned
return UNRESOLVED_ufixed
is
constant ARG_LEFT : INTEGER := ARG'length-1;
alias XARG : UNRESOLVED_UNSIGNED(ARG_LEFT downto 0) is ARG;
begin
if arg'length < 1 then
return NAUF;
end if;
return UNRESOLVED_ufixed(xarg);
end function to_ufixed;
function to_sfixed (
arg : UNRESOLVED_SIGNED; -- signed
constant left_index : INTEGER; -- left index (high index)
constant right_index : INTEGER := 0; -- right index
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_sfixed
is
constant ARG_LEFT : INTEGER := ARG'length-1;
alias XARG : UNRESOLVED_SIGNED(ARG_LEFT downto 0) is ARG;
variable result : UNRESOLVED_sfixed (left_index downto right_index);
begin
if arg'length < 1 or (left_index < right_index) then
return NASF;
end if;
result := resize (arg => UNRESOLVED_sfixed (XARG),
left_index => left_index,
right_index => right_index,
round_style => round_style,
overflow_style => overflow_style);
return result;
end function to_sfixed;
-- converted version
function to_sfixed (
arg : UNRESOLVED_SIGNED) -- signed
return UNRESOLVED_sfixed
is
constant ARG_LEFT : INTEGER := ARG'length-1;
alias XARG : UNRESOLVED_SIGNED(ARG_LEFT downto 0) is ARG;
begin
if arg'length < 1 then
return NASF;
end if;
return UNRESOLVED_sfixed(xarg);
end function to_sfixed;
function to_sfixed (arg : UNRESOLVED_ufixed) return UNRESOLVED_sfixed is
variable result : UNRESOLVED_sfixed (arg'high+1 downto arg'low);
begin
if arg'length < 1 then
return NASF;
end if;
result (arg'high downto arg'low) := UNRESOLVED_sfixed(cleanvec(arg));
result (arg'high+1) := '0';
return result;
end function to_sfixed;
-- Because of the fairly complicated sizing rules in the fixed point
-- packages these functions are provided to compute the result ranges
-- Example:
-- signal uf1 : ufixed (3 downto -3);
-- signal uf2 : ufixed (4 downto -2);
-- signal uf1multuf2 : ufixed (ufixed_high (3, -3, '*', 4, -2) downto
-- ufixed_low (3, -3, '*', 4, -2));
-- uf1multuf2 <= uf1 * uf2;
-- Valid characters: '+', '-', '*', '/', 'r' or 'R' (rem), 'm' or 'M' (mod),
-- '1' (reciprocal), 'A', 'a' (abs), 'N', 'n' (-sfixed)
function ufixed_high (left_index, right_index : INTEGER;
operation : CHARACTER := 'X';
left_index2, right_index2 : INTEGER := 0)
return INTEGER is
begin
case operation is
when '+'| '-' => return maximum (left_index, left_index2) + 1;
when '*' => return left_index + left_index2 + 1;
when '/' => return left_index - right_index2;
when '1' => return -right_index; -- reciprocal
when 'R'|'r' => return mins (left_index, left_index2); -- "rem"
when 'M'|'m' => return mins (left_index, left_index2); -- "mod"
when others => return left_index; -- For abs and default
end case;
end function ufixed_high;
function ufixed_low (left_index, right_index : INTEGER;
operation : CHARACTER := 'X';
left_index2, right_index2 : INTEGER := 0)
return INTEGER is
begin
case operation is
when '+'| '-' => return mins (right_index, right_index2);
when '*' => return right_index + right_index2;
when '/' => return right_index - left_index2 - 1;
when '1' => return -left_index - 1; -- reciprocal
when 'R'|'r' => return mins (right_index, right_index2); -- "rem"
when 'M'|'m' => return mins (right_index, right_index2); -- "mod"
when others => return right_index; -- for abs and default
end case;
end function ufixed_low;
function sfixed_high (left_index, right_index : INTEGER;
operation : CHARACTER := 'X';
left_index2, right_index2 : INTEGER := 0)
return INTEGER is
begin
case operation is
when '+'| '-' => return maximum (left_index, left_index2) + 1;
when '*' => return left_index + left_index2 + 1;
when '/' => return left_index - right_index2 + 1;
when '1' => return -right_index + 1; -- reciprocal
when 'R'|'r' => return mins (left_index, left_index2); -- "rem"
when 'M'|'m' => return left_index2; -- "mod"
when 'A'|'a' => return left_index + 1; -- "abs"
when 'N'|'n' => return left_index + 1; -- -sfixed
when others => return left_index;
end case;
end function sfixed_high;
function sfixed_low (left_index, right_index : INTEGER;
operation : CHARACTER := 'X';
left_index2, right_index2 : INTEGER := 0)
return INTEGER is
begin
case operation is
when '+'| '-' => return mins (right_index, right_index2);
when '*' => return right_index + right_index2;
when '/' => return right_index - left_index2;
when '1' => return -left_index; -- reciprocal
when 'R'|'r' => return mins (right_index, right_index2); -- "rem"
when 'M'|'m' => return mins (right_index, right_index2); -- "mod"
when others => return right_index; -- default for abs, neg and default
end case;
end function sfixed_low;
-- Same as above, but using the "size_res" input only for their ranges:
-- signal uf1multuf2 : ufixed (ufixed_high (uf1, '*', uf2) downto
-- ufixed_low (uf1, '*', uf2));
-- uf1multuf2 <= uf1 * uf2;
function ufixed_high (size_res : UNRESOLVED_ufixed;
operation : CHARACTER := 'X';
size_res2 : UNRESOLVED_ufixed)
return INTEGER is
begin
return ufixed_high (left_index => size_res'high,
right_index => size_res'low,
operation => operation,
left_index2 => size_res2'high,
right_index2 => size_res2'low);
end function ufixed_high;
function ufixed_low (size_res : UNRESOLVED_ufixed;
operation : CHARACTER := 'X';
size_res2 : UNRESOLVED_ufixed)
return INTEGER is
begin
return ufixed_low (left_index => size_res'high,
right_index => size_res'low,
operation => operation,
left_index2 => size_res2'high,
right_index2 => size_res2'low);
end function ufixed_low;
function sfixed_high (size_res : UNRESOLVED_sfixed;
operation : CHARACTER := 'X';
size_res2 : UNRESOLVED_sfixed)
return INTEGER is
begin
return sfixed_high (left_index => size_res'high,
right_index => size_res'low,
operation => operation,
left_index2 => size_res2'high,
right_index2 => size_res2'low);
end function sfixed_high;
function sfixed_low (size_res : UNRESOLVED_sfixed;
operation : CHARACTER := 'X';
size_res2 : UNRESOLVED_sfixed)
return INTEGER is
begin
return sfixed_low (left_index => size_res'high,
right_index => size_res'low,
operation => operation,
left_index2 => size_res2'high,
right_index2 => size_res2'low);
end function sfixed_low;
-- purpose: returns a saturated number
function saturate (
constant left_index : INTEGER;
constant right_index : INTEGER)
return UNRESOLVED_ufixed
is
constant sat : UNRESOLVED_ufixed (left_index downto right_index) :=
(others => '1');
begin
return sat;
end function saturate;
-- purpose: returns a saturated number
function saturate (
constant left_index : INTEGER;
constant right_index : INTEGER)
return UNRESOLVED_sfixed
is
variable sat : UNRESOLVED_sfixed (left_index downto right_index) :=
(others => '1');
begin
-- saturate positive, to saturate negative, just do "not saturate()"
sat (left_index) := '0';
return sat;
end function saturate;
function saturate (
size_res : UNRESOLVED_ufixed) -- only the size of this is used
return UNRESOLVED_ufixed is
begin
return saturate (size_res'high, size_res'low);
end function saturate;
function saturate (
size_res : UNRESOLVED_sfixed) -- only the size of this is used
return UNRESOLVED_sfixed is
begin
return saturate (size_res'high, size_res'low);
end function saturate;
-- As a concession to those who use a graphical DSP environment,
-- these functions take parameters in those tools format and create
-- fixed point numbers. These functions are designed to convert from
-- a std_logic_vector to the VHDL fixed point format using the conventions
-- of these packages. In a pure VHDL environment you should use the
-- "to_ufixed" and "to_sfixed" routines.
-- Unsigned fixed point
function to_UFix (
arg : STD_ULOGIC_VECTOR;
width : NATURAL; -- width of vector
fraction : NATURAL) -- width of fraction
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (width-fraction-1 downto -fraction);
begin
if (arg'length /= result'length) then
report fixed_generic_pkg'instance_name
& "TO_UFIX (STD_ULOGIC_VECTOR) "
& "Vector lengths do not match. Input length is "
& INTEGER'image(arg'length) & " and output will be "
& INTEGER'image(result'length) & " wide."
severity error;
return NAUF;
else
result := to_ufixed (arg, result'high, result'low);
return result;
end if;
end function to_UFix;
-- signed fixed point
function to_SFix (
arg : STD_ULOGIC_VECTOR;
width : NATURAL; -- width of vector
fraction : NATURAL) -- width of fraction
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (width-fraction-1 downto -fraction);
begin
if (arg'length /= result'length) then
report fixed_generic_pkg'instance_name
& "TO_SFIX (STD_ULOGIC_VECTOR) "
& "Vector lengths do not match. Input length is "
& INTEGER'image(arg'length) & " and output will be "
& INTEGER'image(result'length) & " wide."
severity error;
return NASF;
else
result := to_sfixed (arg, result'high, result'low);
return result;
end if;
end function to_SFix;
-- finding the bounds of a number. These functions can be used like this:
-- signal xxx : ufixed (7 downto -3);
-- -- Which is the same as "ufixed (UFix_high (11,3) downto UFix_low(11,3))"
-- signal yyy : ufixed (UFix_high (11, 3, "+", 11, 3)
-- downto UFix_low(11, 3, "+", 11, 3));
-- Where "11" is the width of xxx (xxx'length),
-- and 3 is the lower bound (abs (xxx'low))
-- In a pure VHDL environment use "ufixed_high" and "ufixed_low"
function ufix_high (
width, fraction : NATURAL;
operation : CHARACTER := 'X';
width2, fraction2 : NATURAL := 0)
return INTEGER is
begin
return ufixed_high (left_index => width - 1 - fraction,
right_index => -fraction,
operation => operation,
left_index2 => width2 - 1 - fraction2,
right_index2 => -fraction2);
end function ufix_high;
function ufix_low (
width, fraction : NATURAL;
operation : CHARACTER := 'X';
width2, fraction2 : NATURAL := 0)
return INTEGER is
begin
return ufixed_low (left_index => width - 1 - fraction,
right_index => -fraction,
operation => operation,
left_index2 => width2 - 1 - fraction2,
right_index2 => -fraction2);
end function ufix_low;
function sfix_high (
width, fraction : NATURAL;
operation : CHARACTER := 'X';
width2, fraction2 : NATURAL := 0)
return INTEGER is
begin
return sfixed_high (left_index => width - fraction,
right_index => -fraction,
operation => operation,
left_index2 => width2 - fraction2,
right_index2 => -fraction2);
end function sfix_high;
function sfix_low (
width, fraction : NATURAL;
operation : CHARACTER := 'X';
width2, fraction2 : NATURAL := 0)
return INTEGER is
begin
return sfixed_low (left_index => width - fraction,
right_index => -fraction,
operation => operation,
left_index2 => width2 - fraction2,
right_index2 => -fraction2);
end function sfix_low;
function to_unsigned (
arg : UNRESOLVED_ufixed; -- ufixed point input
constant size : NATURAL; -- length of output
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_UNSIGNED is
begin
return to_uns(resize (arg => arg,
left_index => size-1,
right_index => 0,
round_style => round_style,
overflow_style => overflow_style));
end function to_unsigned;
function to_unsigned (
arg : UNRESOLVED_ufixed; -- ufixed point input
size_res : UNRESOLVED_UNSIGNED; -- length of output
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_UNSIGNED is
begin
return to_unsigned (arg => arg,
size => size_res'length,
round_style => round_style,
overflow_style => overflow_style);
end function to_unsigned;
function to_signed (
arg : UNRESOLVED_sfixed; -- sfixed point input
constant size : NATURAL; -- length of output
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_SIGNED is
begin
return to_s(resize (arg => arg,
left_index => size-1,
right_index => 0,
round_style => round_style,
overflow_style => overflow_style));
end function to_signed;
function to_signed (
arg : UNRESOLVED_sfixed; -- sfixed point input
size_res : UNRESOLVED_SIGNED; -- used for length of output
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_SIGNED is
begin
return to_signed (arg => arg,
size => size_res'length,
round_style => round_style,
overflow_style => overflow_style);
end function to_signed;
function to_real (
arg : UNRESOLVED_ufixed) -- ufixed point input
return REAL
is
constant left_index : INTEGER := arg'high;
constant right_index : INTEGER := arg'low;
variable result : REAL; -- result
variable arg_int : UNRESOLVED_ufixed (left_index downto right_index);
begin
if (arg'length < 1) then
return 0.0;
end if;
arg_int := to_x01(cleanvec(arg));
if (Is_X(arg_int)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& "TO_REAL (ufixed): metavalue detected, returning 0.0"
severity warning;
return 0.0;
end if;
result := 0.0;
for i in arg_int'range loop
if (arg_int(i) = '1') then
result := result + (2.0**i);
end if;
end loop;
return result;
end function to_real;
function to_real (
arg : UNRESOLVED_sfixed) -- ufixed point input
return REAL
is
constant left_index : INTEGER := arg'high;
constant right_index : INTEGER := arg'low;
variable result : REAL; -- result
variable arg_int : UNRESOLVED_sfixed (left_index downto right_index);
-- unsigned version of argument
variable arg_uns : UNRESOLVED_ufixed (left_index downto right_index);
-- absolute of argument
begin
if (arg'length < 1) then
return 0.0;
end if;
arg_int := to_x01(cleanvec(arg));
if (Is_X(arg_int)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& "TO_REAL (sfixed): metavalue detected, returning 0.0"
severity warning;
return 0.0;
end if;
arg_uns := to_ufixed (arg_int);
result := to_real (arg_uns);
if (arg_int(arg_int'high) = '1') then
result := -result;
end if;
return result;
end function to_real;
function to_integer (
arg : UNRESOLVED_ufixed; -- fixed point input
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return NATURAL
is
constant left_index : INTEGER := arg'high;
variable arg_uns : UNRESOLVED_UNSIGNED (left_index+1 downto 0)
:= (others => '0');
begin
if (arg'length < 1) then
return 0;
end if;
if (Is_X (arg)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& "TO_INTEGER (ufixed): metavalue detected, returning 0"
severity warning;
return 0;
end if;
if (left_index < -1) then
return 0;
end if;
arg_uns := to_uns(resize (arg => arg,
left_index => arg_uns'high,
right_index => 0,
round_style => round_style,
overflow_style => overflow_style));
return to_integer (arg_uns);
end function to_integer;
function to_integer (
arg : UNRESOLVED_sfixed; -- fixed point input
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return INTEGER
is
constant left_index : INTEGER := arg'high;
constant right_index : INTEGER := arg'low;
variable arg_s : UNRESOLVED_SIGNED (left_index+1 downto 0);
begin
if (arg'length < 1) then
return 0;
end if;
if (Is_X (arg)) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& "TO_INTEGER (sfixed): metavalue detected, returning 0"
severity warning;
return 0;
end if;
if (left_index < -1) then
return 0;
end if;
arg_s := to_s(resize (arg => arg,
left_index => arg_s'high,
right_index => 0,
round_style => round_style,
overflow_style => overflow_style));
return to_integer (arg_s);
end function to_integer;
function to_01 (
s : UNRESOLVED_ufixed; -- ufixed point input
constant XMAP : STD_ULOGIC := '0') -- Map x to
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (s'range); -- result
begin
if (s'length < 1) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& "TO_01(ufixed): null detected, returning NULL"
severity warning;
return NAUF;
end if;
return to_fixed (to_01(to_uns(s), XMAP), s'high, s'low);
end function to_01;
function to_01 (
s : UNRESOLVED_sfixed; -- sfixed point input
constant XMAP : STD_ULOGIC := '0') -- Map x to
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (s'range);
begin
if (s'length < 1) then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& "TO_01(sfixed): null detected, returning NULL"
severity warning;
return NASF;
end if;
return to_fixed (to_01(to_s(s), XMAP), s'high, s'low);
end function to_01;
function Is_X (
arg : UNRESOLVED_ufixed)
return BOOLEAN
is
variable argslv : STD_ULOGIC_VECTOR (arg'length-1 downto 0); -- slv
begin
argslv := to_sulv(arg);
return Is_X (argslv);
end function Is_X;
function Is_X (
arg : UNRESOLVED_sfixed)
return BOOLEAN
is
variable argslv : STD_ULOGIC_VECTOR (arg'length-1 downto 0); -- slv
begin
argslv := to_sulv(arg);
return Is_X (argslv);
end function Is_X;
function To_X01 (
arg : UNRESOLVED_ufixed)
return UNRESOLVED_ufixed is
begin
return to_ufixed (To_X01(to_sulv(arg)), arg'high, arg'low);
end function To_X01;
function to_X01 (
arg : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed is
begin
return to_sfixed (To_X01(to_sulv(arg)), arg'high, arg'low);
end function To_X01;
function To_X01Z (
arg : UNRESOLVED_ufixed)
return UNRESOLVED_ufixed is
begin
return to_ufixed (To_X01Z(to_sulv(arg)), arg'high, arg'low);
end function To_X01Z;
function to_X01Z (
arg : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed is
begin
return to_sfixed (To_X01Z(to_sulv(arg)), arg'high, arg'low);
end function To_X01Z;
function To_UX01 (
arg : UNRESOLVED_ufixed)
return UNRESOLVED_ufixed is
begin
return to_ufixed (To_UX01(to_sulv(arg)), arg'high, arg'low);
end function To_UX01;
function to_UX01 (
arg : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed is
begin
return to_sfixed (To_UX01(to_sulv(arg)), arg'high, arg'low);
end function To_UX01;
function resize (
arg : UNRESOLVED_ufixed; -- input
constant left_index : INTEGER; -- integer portion
constant right_index : INTEGER; -- size of fraction
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_ufixed
is
constant arghigh : INTEGER := maximum (arg'high, arg'low);
constant arglow : INTEGER := mine (arg'high, arg'low);
variable invec : UNRESOLVED_ufixed (arghigh downto arglow);
variable result : UNRESOLVED_ufixed(left_index downto right_index) :=
(others => '0');
variable needs_rounding : BOOLEAN := false;
begin -- resize
if (arg'length < 1) or (result'length < 1) then
return NAUF;
elsif (invec'length < 1) then
return result; -- string literal value
else
invec := cleanvec(arg);
if (right_index > arghigh) then -- return top zeros
needs_rounding := (round_style = fixed_round) and
(right_index = arghigh+1);
elsif (left_index < arglow) then -- return overflow
if (overflow_style = fixed_saturate) and
(or(to_sulv(invec)) = '1') then
result := saturate (result'high, result'low); -- saturate
end if;
elsif (arghigh > left_index) then
-- wrap or saturate?
if (overflow_style = fixed_saturate and
or (to_sulv(invec(arghigh downto left_index+1))) = '1')
then
result := saturate (result'high, result'low); -- saturate
else
if (arglow >= right_index) then
result (left_index downto arglow) :=
invec(left_index downto arglow);
else
result (left_index downto right_index) :=
invec (left_index downto right_index);
needs_rounding := (round_style = fixed_round); -- round
end if;
end if;
else -- arghigh <= integer width
if (arglow >= right_index) then
result (arghigh downto arglow) := invec;
else
result (arghigh downto right_index) :=
invec (arghigh downto right_index);
needs_rounding := (round_style = fixed_round); -- round
end if;
end if;
-- Round result
if needs_rounding then
result := round_fixed (arg => result,
remainder => invec (right_index-1
downto arglow),
overflow_style => overflow_style);
end if;
return result;
end if;
end function resize;
function resize (
arg : UNRESOLVED_sfixed; -- input
constant left_index : INTEGER; -- integer portion
constant right_index : INTEGER; -- size of fraction
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_sfixed
is
constant arghigh : INTEGER := maximum (arg'high, arg'low);
constant arglow : INTEGER := mine (arg'high, arg'low);
variable invec : UNRESOLVED_sfixed (arghigh downto arglow);
variable result : UNRESOLVED_sfixed(left_index downto right_index) :=
(others => '0');
variable reduced : STD_ULOGIC;
variable needs_rounding : BOOLEAN := false; -- rounding
begin -- resize
if (arg'length < 1) or (result'length < 1) then
return NASF;
elsif (invec'length < 1) then
return result; -- string literal value
else
invec := cleanvec(arg);
if (right_index > arghigh) then -- return top zeros
if (arg'low /= INTEGER'low) then -- check for a literal
result := (others => arg(arghigh)); -- sign extend
end if;
needs_rounding := (round_style = fixed_round) and
(right_index = arghigh+1);
elsif (left_index < arglow) then -- return overflow
if (overflow_style = fixed_saturate) then
reduced := or (to_sulv(invec));
if (reduced = '1') then
if (invec(arghigh) = '0') then
-- saturate POSITIVE
result := saturate (result'high, result'low);
else
-- saturate negative
result := not saturate (result'high, result'low);
end if;
-- else return 0 (input was 0)
end if;
-- else return 0 (wrap)
end if;
elsif (arghigh > left_index) then
if (invec(arghigh) = '0') then
reduced := or (to_sulv(invec(arghigh-1 downto
left_index)));
if overflow_style = fixed_saturate and reduced = '1' then
-- saturate positive
result := saturate (result'high, result'low);
else
if (right_index > arglow) then
result := invec (left_index downto right_index);
needs_rounding := (round_style = fixed_round);
else
result (left_index downto arglow) :=
invec (left_index downto arglow);
end if;
end if;
else
reduced := and (to_sulv(invec(arghigh-1 downto
left_index)));
if overflow_style = fixed_saturate and reduced = '0' then
result := not saturate (result'high, result'low);
else
if (right_index > arglow) then
result := invec (left_index downto right_index);
needs_rounding := (round_style = fixed_round);
else
result (left_index downto arglow) :=
invec (left_index downto arglow);
end if;
end if;
end if;
else -- arghigh <= integer width
if (arglow >= right_index) then
result (arghigh downto arglow) := invec;
else
result (arghigh downto right_index) :=
invec (arghigh downto right_index);
needs_rounding := (round_style = fixed_round); -- round
end if;
if (left_index > arghigh) then -- sign extend
result(left_index downto arghigh+1) := (others => invec(arghigh));
end if;
end if;
-- Round result
if (needs_rounding) then
result := round_fixed (arg => result,
remainder => invec (right_index-1
downto arglow),
overflow_style => overflow_style);
end if;
return result;
end if;
end function resize;
-- size_res functions
-- These functions compute the size from a passed variable named "size_res"
-- The only part of this variable used it it's size, it is never passed
-- to a lower level routine.
function to_ufixed (
arg : STD_ULOGIC_VECTOR; -- shifted vector
size_res : UNRESOLVED_ufixed) -- for size only
return UNRESOLVED_ufixed
is
constant fw : INTEGER := mine (size_res'low, size_res'low); -- catch literals
variable result : UNRESOLVED_ufixed (size_res'left downto fw);
begin
if (result'length < 1 or arg'length < 1) then
return NAUF;
else
result := to_ufixed (arg => arg,
left_index => size_res'high,
right_index => size_res'low);
return result;
end if;
end function to_ufixed;
function to_sfixed (
arg : STD_ULOGIC_VECTOR; -- shifted vector
size_res : UNRESOLVED_sfixed) -- for size only
return UNRESOLVED_sfixed
is
constant fw : INTEGER := mine (size_res'low, size_res'low); -- catch literals
variable result : UNRESOLVED_sfixed (size_res'left downto fw);
begin
if (result'length < 1 or arg'length < 1) then
return NASF;
else
result := to_sfixed (arg => arg,
left_index => size_res'high,
right_index => size_res'low);
return result;
end if;
end function to_sfixed;
function to_ufixed (
arg : NATURAL; -- integer
size_res : UNRESOLVED_ufixed; -- for size only
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_ufixed
is
constant fw : INTEGER := mine (size_res'low, size_res'low); -- catch literals
variable result : UNRESOLVED_ufixed (size_res'left downto fw);
begin
if (result'length < 1) then
return NAUF;
else
result := to_ufixed (arg => arg,
left_index => size_res'high,
right_index => size_res'low,
round_style => round_style,
overflow_style => overflow_style);
return result;
end if;
end function to_ufixed;
function to_sfixed (
arg : INTEGER; -- integer
size_res : UNRESOLVED_sfixed; -- for size only
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_sfixed
is
constant fw : INTEGER := mine (size_res'low, size_res'low); -- catch literals
variable result : UNRESOLVED_sfixed (size_res'left downto fw);
begin
if (result'length < 1) then
return NASF;
else
result := to_sfixed (arg => arg,
left_index => size_res'high,
right_index => size_res'low,
round_style => round_style,
overflow_style => overflow_style);
return result;
end if;
end function to_sfixed;
function to_ufixed (
arg : REAL; -- real
size_res : UNRESOLVED_ufixed; -- for size only
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style;
constant guard_bits : NATURAL := fixed_guard_bits) -- # of guard bits
return UNRESOLVED_ufixed
is
constant fw : INTEGER := mine (size_res'low, size_res'low); -- catch literals
variable result : UNRESOLVED_ufixed (size_res'left downto fw);
begin
if (result'length < 1) then
return NAUF;
else
result := to_ufixed (arg => arg,
left_index => size_res'high,
right_index => size_res'low,
guard_bits => guard_bits,
round_style => round_style,
overflow_style => overflow_style);
return result;
end if;
end function to_ufixed;
function to_sfixed (
arg : REAL; -- real
size_res : UNRESOLVED_sfixed; -- for size only
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style;
constant guard_bits : NATURAL := fixed_guard_bits) -- # of guard bits
return UNRESOLVED_sfixed
is
constant fw : INTEGER := mine (size_res'low, size_res'low); -- catch literals
variable result : UNRESOLVED_sfixed (size_res'left downto fw);
begin
if (result'length < 1) then
return NASF;
else
result := to_sfixed (arg => arg,
left_index => size_res'high,
right_index => size_res'low,
guard_bits => guard_bits,
round_style => round_style,
overflow_style => overflow_style);
return result;
end if;
end function to_sfixed;
function to_ufixed (
arg : UNRESOLVED_UNSIGNED; -- unsigned
size_res : UNRESOLVED_ufixed; -- for size only
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_ufixed
is
constant fw : INTEGER := mine (size_res'low, size_res'low); -- catch literals
variable result : UNRESOLVED_ufixed (size_res'left downto fw);
begin
if (result'length < 1 or arg'length < 1) then
return NAUF;
else
result := to_ufixed (arg => arg,
left_index => size_res'high,
right_index => size_res'low,
round_style => round_style,
overflow_style => overflow_style);
return result;
end if;
end function to_ufixed;
function to_sfixed (
arg : UNRESOLVED_SIGNED; -- signed
size_res : UNRESOLVED_sfixed; -- for size only
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_sfixed
is
constant fw : INTEGER := mine (size_res'low, size_res'low); -- catch literals
variable result : UNRESOLVED_sfixed (size_res'left downto fw);
begin
if (result'length < 1 or arg'length < 1) then
return NASF;
else
result := to_sfixed (arg => arg,
left_index => size_res'high,
right_index => size_res'low,
round_style => round_style,
overflow_style => overflow_style);
return result;
end if;
end function to_sfixed;
function resize (
arg : UNRESOLVED_ufixed; -- input
size_res : UNRESOLVED_ufixed; -- for size only
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_ufixed
is
constant fw : INTEGER := mine (size_res'low, size_res'low); -- catch literals
variable result : UNRESOLVED_ufixed (size_res'high downto fw);
begin
if (result'length < 1 or arg'length < 1) then
return NAUF;
else
result := resize (arg => arg,
left_index => size_res'high,
right_index => size_res'low,
round_style => round_style,
overflow_style => overflow_style);
return result;
end if;
end function resize;
function resize (
arg : UNRESOLVED_sfixed; -- input
size_res : UNRESOLVED_sfixed; -- for size only
constant overflow_style : fixed_overflow_style_type := fixed_overflow_style;
constant round_style : fixed_round_style_type := fixed_round_style)
return UNRESOLVED_sfixed
is
constant fw : INTEGER := mine (size_res'low, size_res'low); -- catch literals
variable result : UNRESOLVED_sfixed (size_res'high downto fw);
begin
if (result'length < 1 or arg'length < 1) then
return NASF;
else
result := resize (arg => arg,
left_index => size_res'high,
right_index => size_res'low,
round_style => round_style,
overflow_style => overflow_style);
return result;
end if;
end function resize;
-- Overloaded math functions for real
function "+" (
l : UNRESOLVED_ufixed; -- fixed point input
r : REAL)
return UNRESOLVED_ufixed is
begin
return (l + to_ufixed (r, l'high, l'low));
end function "+";
function "+" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return (to_ufixed (l, r'high, r'low) + r);
end function "+";
function "+" (
l : UNRESOLVED_sfixed; -- fixed point input
r : REAL)
return UNRESOLVED_sfixed is
begin
return (l + to_sfixed (r, l'high, l'low));
end function "+";
function "+" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed is
begin
return (to_sfixed (l, r'high, r'low) + r);
end function "+";
function "-" (
l : UNRESOLVED_ufixed; -- fixed point input
r : REAL)
return UNRESOLVED_ufixed is
begin
return (l - to_ufixed (r, l'high, l'low));
end function "-";
function "-" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return (to_ufixed (l, r'high, r'low) - r);
end function "-";
function "-" (
l : UNRESOLVED_sfixed; -- fixed point input
r : REAL)
return UNRESOLVED_sfixed is
begin
return (l - to_sfixed (r, l'high, l'low));
end function "-";
function "-" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed is
begin
return (to_sfixed (l, r'high, r'low) - r);
end function "-";
function "*" (
l : UNRESOLVED_ufixed; -- fixed point input
r : REAL)
return UNRESOLVED_ufixed is
begin
return (l * to_ufixed (r, l'high, l'low));
end function "*";
function "*" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return (to_ufixed (l, r'high, r'low) * r);
end function "*";
function "*" (
l : UNRESOLVED_sfixed; -- fixed point input
r : REAL)
return UNRESOLVED_sfixed is
begin
return (l * to_sfixed (r, l'high, l'low));
end function "*";
function "*" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed is
begin
return (to_sfixed (l, r'high, r'low) * r);
end function "*";
function "/" (
l : UNRESOLVED_ufixed; -- fixed point input
r : REAL)
return UNRESOLVED_ufixed is
begin
return (l / to_ufixed (r, l'high, l'low));
end function "/";
function "/" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return (to_ufixed (l, r'high, r'low) / r);
end function "/";
function "/" (
l : UNRESOLVED_sfixed; -- fixed point input
r : REAL)
return UNRESOLVED_sfixed is
begin
return (l / to_sfixed (r, l'high, l'low));
end function "/";
function "/" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed is
begin
return (to_sfixed (l, r'high, r'low) / r);
end function "/";
function "rem" (
l : UNRESOLVED_ufixed; -- fixed point input
r : REAL)
return UNRESOLVED_ufixed is
begin
return (l rem to_ufixed (r, l'high, l'low));
end function "rem";
function "rem" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return (to_ufixed (l, r'high, r'low) rem r);
end function "rem";
function "rem" (
l : UNRESOLVED_sfixed; -- fixed point input
r : REAL)
return UNRESOLVED_sfixed is
begin
return (l rem to_sfixed (r, l'high, l'low));
end function "rem";
function "rem" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed is
begin
return (to_sfixed (l, r'high, r'low) rem r);
end function "rem";
function "mod" (
l : UNRESOLVED_ufixed; -- fixed point input
r : REAL)
return UNRESOLVED_ufixed is
begin
return (l mod to_ufixed (r, l'high, l'low));
end function "mod";
function "mod" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return (to_ufixed (l, r'high, r'low) mod r);
end function "mod";
function "mod" (
l : UNRESOLVED_sfixed; -- fixed point input
r : REAL)
return UNRESOLVED_sfixed is
begin
return (l mod to_sfixed (r, l'high, l'low));
end function "mod";
function "mod" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed is
begin
return (to_sfixed (l, r'high, r'low) mod r);
end function "mod";
-- Overloaded math functions for integers
function "+" (
l : UNRESOLVED_ufixed; -- fixed point input
r : NATURAL)
return UNRESOLVED_ufixed is
begin
return (l + to_ufixed (r, l'high, 0));
end function "+";
function "+" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return (to_ufixed (l, r'high, 0) + r);
end function "+";
function "+" (
l : UNRESOLVED_sfixed; -- fixed point input
r : INTEGER)
return UNRESOLVED_sfixed is
begin
return (l + to_sfixed (r, l'high, 0));
end function "+";
function "+" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed is
begin
return (to_sfixed (l, r'high, 0) + r);
end function "+";
-- Overloaded functions
function "-" (
l : UNRESOLVED_ufixed; -- fixed point input
r : NATURAL)
return UNRESOLVED_ufixed is
begin
return (l - to_ufixed (r, l'high, 0));
end function "-";
function "-" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return (to_ufixed (l, r'high, 0) - r);
end function "-";
function "-" (
l : UNRESOLVED_sfixed; -- fixed point input
r : INTEGER)
return UNRESOLVED_sfixed is
begin
return (l - to_sfixed (r, l'high, 0));
end function "-";
function "-" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed is
begin
return (to_sfixed (l, r'high, 0) - r);
end function "-";
-- Overloaded functions
function "*" (
l : UNRESOLVED_ufixed; -- fixed point input
r : NATURAL)
return UNRESOLVED_ufixed is
begin
return (l * to_ufixed (r, l'high, 0));
end function "*";
function "*" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return (to_ufixed (l, r'high, 0) * r);
end function "*";
function "*" (
l : UNRESOLVED_sfixed; -- fixed point input
r : INTEGER)
return UNRESOLVED_sfixed is
begin
return (l * to_sfixed (r, l'high, 0));
end function "*";
function "*" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed is
begin
return (to_sfixed (l, r'high, 0) * r);
end function "*";
-- Overloaded functions
function "/" (
l : UNRESOLVED_ufixed; -- fixed point input
r : NATURAL)
return UNRESOLVED_ufixed is
begin
return (l / to_ufixed (r, l'high, 0));
end function "/";
function "/" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return (to_ufixed (l, r'high, 0) / r);
end function "/";
function "/" (
l : UNRESOLVED_sfixed; -- fixed point input
r : INTEGER)
return UNRESOLVED_sfixed is
begin
return (l / to_sfixed (r, l'high, 0));
end function "/";
function "/" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed is
begin
return (to_sfixed (l, r'high, 0) / r);
end function "/";
function "rem" (
l : UNRESOLVED_ufixed; -- fixed point input
r : NATURAL)
return UNRESOLVED_ufixed is
begin
return (l rem to_ufixed (r, l'high, 0));
end function "rem";
function "rem" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return (to_ufixed (l, r'high, 0) rem r);
end function "rem";
function "rem" (
l : UNRESOLVED_sfixed; -- fixed point input
r : INTEGER)
return UNRESOLVED_sfixed is
begin
return (l rem to_sfixed (r, l'high, 0));
end function "rem";
function "rem" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed is
begin
return (to_sfixed (l, r'high, 0) rem r);
end function "rem";
function "mod" (
l : UNRESOLVED_ufixed; -- fixed point input
r : NATURAL)
return UNRESOLVED_ufixed is
begin
return (l mod to_ufixed (r, l'high, 0));
end function "mod";
function "mod" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return (to_ufixed (l, r'high, 0) mod r);
end function "mod";
function "mod" (
l : UNRESOLVED_sfixed; -- fixed point input
r : INTEGER)
return UNRESOLVED_sfixed is
begin
return (l mod to_sfixed (r, l'high, 0));
end function "mod";
function "mod" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return UNRESOLVED_sfixed is
begin
return (to_sfixed (l, r'high, 0) mod r);
end function "mod";
-- overloaded ufixed compare functions with integer
function "=" (
l : UNRESOLVED_ufixed;
r : NATURAL) -- fixed point input
return BOOLEAN is
begin
return (l = to_ufixed (r, l'high, l'low));
end function "=";
function "/=" (
l : UNRESOLVED_ufixed;
r : NATURAL) -- fixed point input
return BOOLEAN is
begin
return (l /= to_ufixed (r, l'high, l'low));
end function "/=";
function ">=" (
l : UNRESOLVED_ufixed;
r : NATURAL) -- fixed point input
return BOOLEAN is
begin
return (l >= to_ufixed (r, l'high, l'low));
end function ">=";
function "<=" (
l : UNRESOLVED_ufixed;
r : NATURAL) -- fixed point input
return BOOLEAN is
begin
return (l <= to_ufixed (r, l'high, l'low));
end function "<=";
function ">" (
l : UNRESOLVED_ufixed;
r : NATURAL) -- fixed point input
return BOOLEAN is
begin
return (l > to_ufixed (r, l'high, l'low));
end function ">";
function "<" (
l : UNRESOLVED_ufixed;
r : NATURAL) -- fixed point input
return BOOLEAN is
begin
return (l < to_ufixed (r, l'high, l'low));
end function "<";
function "?=" (
l : UNRESOLVED_ufixed;
r : NATURAL) -- fixed point input
return STD_ULOGIC is
begin
return (l ?= to_ufixed (r, l'high, l'low));
end function "?=";
function "?/=" (
l : UNRESOLVED_ufixed;
r : NATURAL) -- fixed point input
return STD_ULOGIC is
begin
return (l ?/= to_ufixed (r, l'high, l'low));
end function "?/=";
function "?>=" (
l : UNRESOLVED_ufixed;
r : NATURAL) -- fixed point input
return STD_ULOGIC is
begin
return (l ?>= to_ufixed (r, l'high, l'low));
end function "?>=";
function "?<=" (
l : UNRESOLVED_ufixed;
r : NATURAL) -- fixed point input
return STD_ULOGIC is
begin
return (l ?<= to_ufixed (r, l'high, l'low));
end function "?<=";
function "?>" (
l : UNRESOLVED_ufixed;
r : NATURAL) -- fixed point input
return STD_ULOGIC is
begin
return (l ?> to_ufixed (r, l'high, l'low));
end function "?>";
function "?<" (
l : UNRESOLVED_ufixed;
r : NATURAL) -- fixed point input
return STD_ULOGIC is
begin
return (l ?< to_ufixed (r, l'high, l'low));
end function "?<";
function maximum (
l : UNRESOLVED_ufixed; -- fixed point input
r : NATURAL)
return UNRESOLVED_ufixed is
begin
return maximum (l, to_ufixed (r, l'high, l'low));
end function maximum;
function minimum (
l : UNRESOLVED_ufixed; -- fixed point input
r : NATURAL)
return UNRESOLVED_ufixed is
begin
return minimum (l, to_ufixed (r, l'high, l'low));
end function minimum;
-- NATURAL to ufixed
function "=" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN is
begin
return (to_ufixed (l, r'high, r'low) = r);
end function "=";
function "/=" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN is
begin
return (to_ufixed (l, r'high, r'low) /= r);
end function "/=";
function ">=" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN is
begin
return (to_ufixed (l, r'high, r'low) >= r);
end function ">=";
function "<=" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN is
begin
return (to_ufixed (l, r'high, r'low) <= r);
end function "<=";
function ">" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN is
begin
return (to_ufixed (l, r'high, r'low) > r);
end function ">";
function "<" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN is
begin
return (to_ufixed (l, r'high, r'low) < r);
end function "<";
function "?=" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_ufixed (l, r'high, r'low) ?= r);
end function "?=";
function "?/=" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_ufixed (l, r'high, r'low) ?/= r);
end function "?/=";
function "?>=" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_ufixed (l, r'high, r'low) ?>= r);
end function "?>=";
function "?<=" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_ufixed (l, r'high, r'low) ?<= r);
end function "?<=";
function "?>" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_ufixed (l, r'high, r'low) ?> r);
end function "?>";
function "?<" (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_ufixed (l, r'high, r'low) ?< r);
end function "?<";
function maximum (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return maximum (to_ufixed (l, r'high, r'low), r);
end function maximum;
function minimum (
l : NATURAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return minimum (to_ufixed (l, r'high, r'low), r);
end function minimum;
-- overloaded ufixed compare functions with real
function "=" (
l : UNRESOLVED_ufixed;
r : REAL)
return BOOLEAN is
begin
return (l = to_ufixed (r, l'high, l'low));
end function "=";
function "/=" (
l : UNRESOLVED_ufixed;
r : REAL)
return BOOLEAN is
begin
return (l /= to_ufixed (r, l'high, l'low));
end function "/=";
function ">=" (
l : UNRESOLVED_ufixed;
r : REAL)
return BOOLEAN is
begin
return (l >= to_ufixed (r, l'high, l'low));
end function ">=";
function "<=" (
l : UNRESOLVED_ufixed;
r : REAL)
return BOOLEAN is
begin
return (l <= to_ufixed (r, l'high, l'low));
end function "<=";
function ">" (
l : UNRESOLVED_ufixed;
r : REAL)
return BOOLEAN is
begin
return (l > to_ufixed (r, l'high, l'low));
end function ">";
function "<" (
l : UNRESOLVED_ufixed;
r : REAL)
return BOOLEAN is
begin
return (l < to_ufixed (r, l'high, l'low));
end function "<";
function "?=" (
l : UNRESOLVED_ufixed;
r : REAL)
return STD_ULOGIC is
begin
return (l ?= to_ufixed (r, l'high, l'low));
end function "?=";
function "?/=" (
l : UNRESOLVED_ufixed;
r : REAL)
return STD_ULOGIC is
begin
return (l ?/= to_ufixed (r, l'high, l'low));
end function "?/=";
function "?>=" (
l : UNRESOLVED_ufixed;
r : REAL)
return STD_ULOGIC is
begin
return (l ?>= to_ufixed (r, l'high, l'low));
end function "?>=";
function "?<=" (
l : UNRESOLVED_ufixed;
r : REAL)
return STD_ULOGIC is
begin
return (l ?<= to_ufixed (r, l'high, l'low));
end function "?<=";
function "?>" (
l : UNRESOLVED_ufixed;
r : REAL)
return STD_ULOGIC is
begin
return (l ?> to_ufixed (r, l'high, l'low));
end function "?>";
function "?<" (
l : UNRESOLVED_ufixed;
r : REAL)
return STD_ULOGIC is
begin
return (l ?< to_ufixed (r, l'high, l'low));
end function "?<";
function maximum (
l : UNRESOLVED_ufixed;
r : REAL)
return UNRESOLVED_ufixed is
begin
return maximum (l, to_ufixed (r, l'high, l'low));
end function maximum;
function minimum (
l : UNRESOLVED_ufixed;
r : REAL)
return UNRESOLVED_ufixed is
begin
return minimum (l, to_ufixed (r, l'high, l'low));
end function minimum;
-- real and ufixed
function "=" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN is
begin
return (to_ufixed (l, r'high, r'low) = r);
end function "=";
function "/=" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN is
begin
return (to_ufixed (l, r'high, r'low) /= r);
end function "/=";
function ">=" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN is
begin
return (to_ufixed (l, r'high, r'low) >= r);
end function ">=";
function "<=" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN is
begin
return (to_ufixed (l, r'high, r'low) <= r);
end function "<=";
function ">" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN is
begin
return (to_ufixed (l, r'high, r'low) > r);
end function ">";
function "<" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return BOOLEAN is
begin
return (to_ufixed (l, r'high, r'low) < r);
end function "<";
function "?=" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_ufixed (l, r'high, r'low) ?= r);
end function "?=";
function "?/=" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_ufixed (l, r'high, r'low) ?/= r);
end function "?/=";
function "?>=" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_ufixed (l, r'high, r'low) ?>= r);
end function "?>=";
function "?<=" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_ufixed (l, r'high, r'low) ?<= r);
end function "?<=";
function "?>" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_ufixed (l, r'high, r'low) ?> r);
end function "?>";
function "?<" (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_ufixed (l, r'high, r'low) ?< r);
end function "?<";
function maximum (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return maximum (to_ufixed (l, r'high, r'low), r);
end function maximum;
function minimum (
l : REAL;
r : UNRESOLVED_ufixed) -- fixed point input
return UNRESOLVED_ufixed is
begin
return minimum (to_ufixed (l, r'high, r'low), r);
end function minimum;
-- overloaded sfixed compare functions with integer
function "=" (
l : UNRESOLVED_sfixed;
r : INTEGER)
return BOOLEAN is
begin
return (l = to_sfixed (r, l'high, l'low));
end function "=";
function "/=" (
l : UNRESOLVED_sfixed;
r : INTEGER)
return BOOLEAN is
begin
return (l /= to_sfixed (r, l'high, l'low));
end function "/=";
function ">=" (
l : UNRESOLVED_sfixed;
r : INTEGER)
return BOOLEAN is
begin
return (l >= to_sfixed (r, l'high, l'low));
end function ">=";
function "<=" (
l : UNRESOLVED_sfixed;
r : INTEGER)
return BOOLEAN is
begin
return (l <= to_sfixed (r, l'high, l'low));
end function "<=";
function ">" (
l : UNRESOLVED_sfixed;
r : INTEGER)
return BOOLEAN is
begin
return (l > to_sfixed (r, l'high, l'low));
end function ">";
function "<" (
l : UNRESOLVED_sfixed;
r : INTEGER)
return BOOLEAN is
begin
return (l < to_sfixed (r, l'high, l'low));
end function "<";
function "?=" (
l : UNRESOLVED_sfixed;
r : INTEGER)
return STD_ULOGIC is
begin
return (l ?= to_sfixed (r, l'high, l'low));
end function "?=";
function "?/=" (
l : UNRESOLVED_sfixed;
r : INTEGER)
return STD_ULOGIC is
begin
return (l ?/= to_sfixed (r, l'high, l'low));
end function "?/=";
function "?>=" (
l : UNRESOLVED_sfixed;
r : INTEGER)
return STD_ULOGIC is
begin
return (l ?>= to_sfixed (r, l'high, l'low));
end function "?>=";
function "?<=" (
l : UNRESOLVED_sfixed;
r : INTEGER)
return STD_ULOGIC is
begin
return (l ?<= to_sfixed (r, l'high, l'low));
end function "?<=";
function "?>" (
l : UNRESOLVED_sfixed;
r : INTEGER)
return STD_ULOGIC is
begin
return (l ?> to_sfixed (r, l'high, l'low));
end function "?>";
function "?<" (
l : UNRESOLVED_sfixed;
r : INTEGER)
return STD_ULOGIC is
begin
return (l ?< to_sfixed (r, l'high, l'low));
end function "?<";
function maximum (
l : UNRESOLVED_sfixed;
r : INTEGER)
return UNRESOLVED_sfixed is
begin
return maximum (l, to_sfixed (r, l'high, l'low));
end function maximum;
function minimum (
l : UNRESOLVED_sfixed;
r : INTEGER)
return UNRESOLVED_sfixed is
begin
return minimum (l, to_sfixed (r, l'high, l'low));
end function minimum;
-- integer and sfixed
function "=" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN is
begin
return (to_sfixed (l, r'high, r'low) = r);
end function "=";
function "/=" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN is
begin
return (to_sfixed (l, r'high, r'low) /= r);
end function "/=";
function ">=" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN is
begin
return (to_sfixed (l, r'high, r'low) >= r);
end function ">=";
function "<=" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN is
begin
return (to_sfixed (l, r'high, r'low) <= r);
end function "<=";
function ">" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN is
begin
return (to_sfixed (l, r'high, r'low) > r);
end function ">";
function "<" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN is
begin
return (to_sfixed (l, r'high, r'low) < r);
end function "<";
function "?=" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_sfixed (l, r'high, r'low) ?= r);
end function "?=";
function "?/=" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_sfixed (l, r'high, r'low) ?/= r);
end function "?/=";
function "?>=" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_sfixed (l, r'high, r'low) ?>= r);
end function "?>=";
function "?<=" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_sfixed (l, r'high, r'low) ?<= r);
end function "?<=";
function "?>" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_sfixed (l, r'high, r'low) ?> r);
end function "?>";
function "?<" (
l : INTEGER;
r : UNRESOLVED_sfixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_sfixed (l, r'high, r'low) ?< r);
end function "?<";
function maximum (
l : INTEGER;
r : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed is
begin
return maximum (to_sfixed (l, r'high, r'low), r);
end function maximum;
function minimum (
l : INTEGER;
r : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed is
begin
return minimum (to_sfixed (l, r'high, r'low), r);
end function minimum;
-- overloaded sfixed compare functions with real
function "=" (
l : UNRESOLVED_sfixed;
r : REAL)
return BOOLEAN is
begin
return (l = to_sfixed (r, l'high, l'low));
end function "=";
function "/=" (
l : UNRESOLVED_sfixed;
r : REAL)
return BOOLEAN is
begin
return (l /= to_sfixed (r, l'high, l'low));
end function "/=";
function ">=" (
l : UNRESOLVED_sfixed;
r : REAL)
return BOOLEAN is
begin
return (l >= to_sfixed (r, l'high, l'low));
end function ">=";
function "<=" (
l : UNRESOLVED_sfixed;
r : REAL)
return BOOLEAN is
begin
return (l <= to_sfixed (r, l'high, l'low));
end function "<=";
function ">" (
l : UNRESOLVED_sfixed;
r : REAL)
return BOOLEAN is
begin
return (l > to_sfixed (r, l'high, l'low));
end function ">";
function "<" (
l : UNRESOLVED_sfixed;
r : REAL)
return BOOLEAN is
begin
return (l < to_sfixed (r, l'high, l'low));
end function "<";
function "?=" (
l : UNRESOLVED_sfixed;
r : REAL)
return STD_ULOGIC is
begin
return (l ?= to_sfixed (r, l'high, l'low));
end function "?=";
function "?/=" (
l : UNRESOLVED_sfixed;
r : REAL)
return STD_ULOGIC is
begin
return (l ?/= to_sfixed (r, l'high, l'low));
end function "?/=";
function "?>=" (
l : UNRESOLVED_sfixed;
r : REAL)
return STD_ULOGIC is
begin
return (l ?>= to_sfixed (r, l'high, l'low));
end function "?>=";
function "?<=" (
l : UNRESOLVED_sfixed;
r : REAL)
return STD_ULOGIC is
begin
return (l ?<= to_sfixed (r, l'high, l'low));
end function "?<=";
function "?>" (
l : UNRESOLVED_sfixed;
r : REAL)
return STD_ULOGIC is
begin
return (l ?> to_sfixed (r, l'high, l'low));
end function "?>";
function "?<" (
l : UNRESOLVED_sfixed;
r : REAL)
return STD_ULOGIC is
begin
return (l ?< to_sfixed (r, l'high, l'low));
end function "?<";
function maximum (
l : UNRESOLVED_sfixed;
r : REAL)
return UNRESOLVED_sfixed is
begin
return maximum (l, to_sfixed (r, l'high, l'low));
end function maximum;
function minimum (
l : UNRESOLVED_sfixed;
r : REAL)
return UNRESOLVED_sfixed is
begin
return minimum (l, to_sfixed (r, l'high, l'low));
end function minimum;
-- REAL and sfixed
function "=" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN is
begin
return (to_sfixed (l, r'high, r'low) = r);
end function "=";
function "/=" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN is
begin
return (to_sfixed (l, r'high, r'low) /= r);
end function "/=";
function ">=" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN is
begin
return (to_sfixed (l, r'high, r'low) >= r);
end function ">=";
function "<=" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN is
begin
return (to_sfixed (l, r'high, r'low) <= r);
end function "<=";
function ">" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN is
begin
return (to_sfixed (l, r'high, r'low) > r);
end function ">";
function "<" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return BOOLEAN is
begin
return (to_sfixed (l, r'high, r'low) < r);
end function "<";
function "?=" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_sfixed (l, r'high, r'low) ?= r);
end function "?=";
function "?/=" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_sfixed (l, r'high, r'low) ?/= r);
end function "?/=";
function "?>=" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_sfixed (l, r'high, r'low) ?>= r);
end function "?>=";
function "?<=" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_sfixed (l, r'high, r'low) ?<= r);
end function "?<=";
function "?>" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_sfixed (l, r'high, r'low) ?> r);
end function "?>";
function "?<" (
l : REAL;
r : UNRESOLVED_sfixed) -- fixed point input
return STD_ULOGIC is
begin
return (to_sfixed (l, r'high, r'low) ?< r);
end function "?<";
function maximum (
l : REAL;
r : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed is
begin
return maximum (to_sfixed (l, r'high, r'low), r);
end function maximum;
function minimum (
l : REAL;
r : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed is
begin
return minimum (to_sfixed (l, r'high, r'low), r);
end function minimum;
-- copied from std_logic_textio
type MVL9plus is ('U', 'X', '0', '1', 'Z', 'W', 'L', 'H', '-', error);
type char_indexed_by_MVL9 is array (STD_ULOGIC) of CHARACTER;
type MVL9_indexed_by_char is array (CHARACTER) of STD_ULOGIC;
type MVL9plus_indexed_by_char is array (CHARACTER) of MVL9plus;
constant MVL9_to_char : char_indexed_by_MVL9 := "UX01ZWLH-";
constant char_to_MVL9 : MVL9_indexed_by_char :=
('U' => 'U', 'X' => 'X', '0' => '0', '1' => '1', 'Z' => 'Z',
'W' => 'W', 'L' => 'L', 'H' => 'H', '-' => '-', others => 'U');
constant char_to_MVL9plus : MVL9plus_indexed_by_char :=
('U' => 'U', 'X' => 'X', '0' => '0', '1' => '1', 'Z' => 'Z',
'W' => 'W', 'L' => 'L', 'H' => 'H', '-' => '-', others => error);
constant NBSP : CHARACTER := CHARACTER'val(160); -- space character
constant NUS : STRING(2 to 1) := (others => ' ');
-- purpose: Skips white space
procedure skip_whitespace (
L : inout LINE) is
variable readOk : BOOLEAN;
variable c : CHARACTER;
begin
while L /= null and L.all'length /= 0 loop
c := l (l'left);
if (c = ' ' or c = NBSP or c = HT) then
read (l, c, readOk);
else
exit;
end if;
end loop;
end procedure skip_whitespace;
-- purpose: writes fixed point into a line
procedure write (
L : inout LINE; -- input line
VALUE : in UNRESOLVED_ufixed; -- fixed point input
JUSTIFIED : in SIDE := right;
FIELD : in WIDTH := 0) is
variable s : STRING(1 to value'length +1) := (others => ' ');
variable sindx : INTEGER;
begin -- function write Example: 0011.1100
sindx := 1;
for i in value'high downto value'low loop
if i = -1 then
s(sindx) := '.';
sindx := sindx + 1;
end if;
s(sindx) := MVL9_to_char(STD_ULOGIC(value(i)));
sindx := sindx + 1;
end loop;
write(l, s, justified, field);
end procedure write;
-- purpose: writes fixed point into a line
procedure write (
L : inout LINE; -- input line
VALUE : in UNRESOLVED_sfixed; -- fixed point input
JUSTIFIED : in SIDE := right;
FIELD : in WIDTH := 0) is
variable s : STRING(1 to value'length +1);
variable sindx : INTEGER;
begin -- function write Example: 0011.1100
sindx := 1;
for i in value'high downto value'low loop
if i = -1 then
s(sindx) := '.';
sindx := sindx + 1;
end if;
s(sindx) := MVL9_to_char(STD_ULOGIC(value(i)));
sindx := sindx + 1;
end loop;
write(l, s, justified, field);
end procedure write;
procedure READ(L : inout LINE;
VALUE : out UNRESOLVED_ufixed) is
-- Possible data: 00000.0000000
-- 000000000000
variable c : CHARACTER;
variable readOk : BOOLEAN;
variable i : INTEGER; -- index variable
variable mv : ufixed (VALUE'range);
variable lastu : BOOLEAN := false; -- last character was an "_"
variable founddot : BOOLEAN := false; -- found a "."
begin -- READ
VALUE := (VALUE'range => 'U');
Skip_whitespace (L);
if VALUE'length > 0 then -- non Null input string
read (l, c, readOk);
i := value'high;
while i >= VALUE'low loop
if readOk = false then -- Bail out if there was a bad read
report fixed_generic_pkg'instance_name & "READ(ufixed) "
& "End of string encountered"
severity error;
return;
elsif c = '_' then
if i = value'high then
report fixed_generic_pkg'instance_name & "READ(ufixed) "
& "String begins with an ""_""" severity error;
return;
elsif lastu then
report fixed_generic_pkg'instance_name & "READ(ufixed) "
& "Two underscores detected in input string ""__"""
severity error;
return;
else
lastu := true;
end if;
elsif c = '.' then -- binary point
if founddot then
report fixed_generic_pkg'instance_name & "READ(ufixed) "
& "Two binary points found in input string" severity error;
return;
elsif i /= -1 then -- Seperator in the wrong spot
report fixed_generic_pkg'instance_name & "READ(ufixed) "
& "Decimal point does not match number format "
severity error;
return;
end if;
founddot := true;
lastu := false;
elsif c = ' ' or c = NBSP or c = HT then -- reading done.
report fixed_generic_pkg'instance_name & "READ(ufixed) "
& "Short read, Space encounted in input string"
severity error;
return;
elsif char_to_MVL9plus(c) = error then
report fixed_generic_pkg'instance_name & "READ(ufixed) "
& "Character '" &
c & "' read, expected STD_ULOGIC literal."
severity error;
return;
else
mv(i) := char_to_MVL9(c);
i := i - 1;
if i < mv'low then
VALUE := mv;
return;
end if;
lastu := false;
end if;
read(L, c, readOk);
end loop;
end if;
end procedure READ;
procedure READ(L : inout LINE;
VALUE : out UNRESOLVED_ufixed;
GOOD : out BOOLEAN) is
-- Possible data: 00000.0000000
-- 000000000000
variable c : CHARACTER;
variable readOk : BOOLEAN;
variable mv : ufixed (VALUE'range);
variable i : INTEGER; -- index variable
variable lastu : BOOLEAN := false; -- last character was an "_"
variable founddot : BOOLEAN := false; -- found a "."
begin -- READ
VALUE := (VALUE'range => 'U');
Skip_whitespace (L);
if VALUE'length > 0 then
read (l, c, readOk);
i := value'high;
GOOD := false;
while i >= VALUE'low loop
if not readOk then -- Bail out if there was a bad read
return;
elsif c = '_' then
if i = value'high then -- Begins with an "_"
return;
elsif lastu then -- "__" detected
return;
else
lastu := true;
end if;
elsif c = '.' then -- binary point
if founddot then
return;
elsif i /= -1 then -- Seperator in the wrong spot
return;
end if;
founddot := true;
lastu := false;
elsif (char_to_MVL9plus(c) = error) then -- Illegal character/short read
return;
else
mv(i) := char_to_MVL9(c);
i := i - 1;
if i < mv'low then -- reading done
GOOD := true;
VALUE := mv;
return;
end if;
lastu := false;
end if;
read(L, c, readOk);
end loop;
else
GOOD := true; -- read into a null array
end if;
end procedure READ;
procedure READ(L : inout LINE;
VALUE : out UNRESOLVED_sfixed) is
variable c : CHARACTER;
variable readOk : BOOLEAN;
variable i : INTEGER; -- index variable
variable mv : sfixed (VALUE'range);
variable lastu : BOOLEAN := false; -- last character was an "_"
variable founddot : BOOLEAN := false; -- found a "."
begin -- READ
VALUE := (VALUE'range => 'U');
Skip_whitespace (L);
if VALUE'length > 0 then -- non Null input string
read (l, c, readOk);
i := value'high;
while i >= VALUE'low loop
if readOk = false then -- Bail out if there was a bad read
report fixed_generic_pkg'instance_name & "READ(sfixed) "
& "End of string encountered"
severity error;
return;
elsif c = '_' then
if i = value'high then
report fixed_generic_pkg'instance_name & "READ(sfixed) "
& "String begins with an ""_""" severity error;
return;
elsif lastu then
report fixed_generic_pkg'instance_name & "READ(sfixed) "
& "Two underscores detected in input string ""__"""
severity error;
return;
else
lastu := true;
end if;
elsif c = '.' then -- binary point
if founddot then
report fixed_generic_pkg'instance_name & "READ(sfixed) "
& "Two binary points found in input string" severity error;
return;
elsif i /= -1 then -- Seperator in the wrong spot
report fixed_generic_pkg'instance_name & "READ(sfixed) "
& "Decimal point does not match number format "
severity error;
return;
end if;
founddot := true;
lastu := false;
elsif c = ' ' or c = NBSP or c = HT then -- reading done.
report fixed_generic_pkg'instance_name & "READ(sfixed) "
& "Short read, Space encounted in input string"
severity error;
return;
elsif char_to_MVL9plus(c) = error then
report fixed_generic_pkg'instance_name & "READ(sfixed) "
& "Character '" &
c & "' read, expected STD_ULOGIC literal."
severity error;
return;
else
mv(i) := char_to_MVL9(c);
i := i - 1;
if i < mv'low then
VALUE := mv;
return;
end if;
lastu := false;
end if;
read(L, c, readOk);
end loop;
end if;
end procedure READ;
procedure READ(L : inout LINE;
VALUE : out UNRESOLVED_sfixed;
GOOD : out BOOLEAN) is
variable value_ufixed : UNRESOLVED_ufixed (VALUE'range);
begin -- READ
READ (L => L, VALUE => value_ufixed, GOOD => GOOD);
VALUE := UNRESOLVED_sfixed (value_ufixed);
end procedure READ;
-- octal read and write
procedure owrite (
L : inout LINE; -- input line
VALUE : in UNRESOLVED_ufixed; -- fixed point input
JUSTIFIED : in SIDE := right;
FIELD : in WIDTH := 0) is
begin -- Example 03.30
write (L => L,
VALUE => to_ostring (VALUE),
JUSTIFIED => JUSTIFIED,
FIELD => FIELD);
end procedure owrite;
procedure owrite (
L : inout LINE; -- input line
VALUE : in UNRESOLVED_sfixed; -- fixed point input
JUSTIFIED : in SIDE := right;
FIELD : in WIDTH := 0) is
begin -- Example 03.30
write (L => L,
VALUE => to_ostring (VALUE),
JUSTIFIED => JUSTIFIED,
FIELD => FIELD);
end procedure owrite;
-- Note that for Octal and Hex read, you can not start with a ".",
-- the read is for numbers formatted "A.BC". These routines go to
-- the nearest bounds, so "F.E" will fit into an sfixed (2 downto -3).
procedure Char2TriBits (C : CHARACTER;
RESULT : out STD_ULOGIC_VECTOR(2 downto 0);
GOOD : out BOOLEAN;
ISSUE_ERROR : in BOOLEAN) is
begin
case c is
when '0' => result := o"0"; good := true;
when '1' => result := o"1"; good := true;
when '2' => result := o"2"; good := true;
when '3' => result := o"3"; good := true;
when '4' => result := o"4"; good := true;
when '5' => result := o"5"; good := true;
when '6' => result := o"6"; good := true;
when '7' => result := o"7"; good := true;
when 'Z' => result := "ZZZ"; good := true;
when 'X' => result := "XXX"; good := true;
when others =>
assert not ISSUE_ERROR
report fixed_generic_pkg'instance_name
& "OREAD Error: Read a '" & c &
"', expected an Octal character (0-7)."
severity error;
result := "UUU";
good := false;
end case;
end procedure Char2TriBits;
-- purpose: Routines common to the OREAD routines
procedure OREAD_common (
L : inout LINE;
slv : out STD_ULOGIC_VECTOR;
igood : out BOOLEAN;
idex : out INTEGER;
constant bpoint : in INTEGER; -- binary point
constant message : in BOOLEAN;
constant smath : in BOOLEAN) is
-- purpose: error message routine
procedure errmes (
constant mess : in STRING) is -- error message
begin
if message then
if smath then
report fixed_generic_pkg'instance_name
& "OREAD(sfixed) "
& mess
severity error;
else
report fixed_generic_pkg'instance_name
& "OREAD(ufixed) "
& mess
severity error;
end if;
end if;
end procedure errmes;
variable xgood : BOOLEAN;
variable nybble : STD_ULOGIC_VECTOR (2 downto 0); -- 3 bits
variable c : CHARACTER;
variable i : INTEGER;
variable lastu : BOOLEAN := false; -- last character was an "_"
variable founddot : BOOLEAN := false; -- found a dot.
begin
Skip_whitespace (L);
if slv'length > 0 then
i := slv'high;
read (l, c, xgood);
while i > 0 loop
if xgood = false then
errmes ("Error: end of string encountered");
exit;
elsif c = '_' then
if i = slv'length then
errmes ("Error: String begins with an ""_""");
xgood := false;
exit;
elsif lastu then
errmes ("Error: Two underscores detected in input string ""__""");
xgood := false;
exit;
else
lastu := true;
end if;
elsif (c = '.') then
if (i + 1 /= bpoint) then
errmes ("encountered ""."" at wrong index");
xgood := false;
exit;
elsif i = slv'length then
errmes ("encounted a ""."" at the beginning of the line");
xgood := false;
exit;
elsif founddot then
errmes ("Two ""."" encounted in input string");
xgood := false;
exit;
end if;
founddot := true;
lastu := false;
else
Char2triBits(c, nybble, xgood, message);
if not xgood then
exit;
end if;
slv (i downto i-2) := nybble;
i := i - 3;
lastu := false;
end if;
if i > 0 then
read (L, c, xgood);
end if;
end loop;
idex := i;
igood := xgood;
else
igood := true; -- read into a null array
idex := -1;
end if;
end procedure OREAD_common;
-- Note that for Octal and Hex read, you can not start with a ".",
-- the read is for numbers formatted "A.BC". These routines go to
-- the nearest bounds, so "F.E" will fit into an sfixed (2 downto -3).
procedure OREAD (L : inout LINE;
VALUE : out UNRESOLVED_ufixed) is
constant hbv : INTEGER := (((maximum(3, (VALUE'high+1))+2)/3)*3)-1;
constant lbv : INTEGER := ((mine(0, VALUE'low)-2)/3)*3;
variable slv : STD_ULOGIC_VECTOR (hbv-lbv downto 0); -- high bits
variable valuex : UNRESOLVED_ufixed (hbv downto lbv);
variable igood : BOOLEAN;
variable i : INTEGER;
begin
VALUE := (VALUE'range => 'U');
OREAD_common ( L => L,
slv => slv,
igood => igood,
idex => i,
bpoint => -lbv,
message => true,
smath => false);
if igood then -- We did not get another error
if not ((i = -1) and -- We read everything, and high bits 0
(or (slv(hbv-lbv downto VALUE'high+1-lbv)) = '0')) then
report fixed_generic_pkg'instance_name
& "OREAD(ufixed): Vector truncated."
severity error;
else
if (or (slv(VALUE'low-lbv-1 downto 0)) = '1') then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& "OREAD(ufixed): Vector truncated"
severity warning;
end if;
valuex := to_ufixed (slv, hbv, lbv);
VALUE := valuex (VALUE'range);
end if;
end if;
end procedure OREAD;
procedure OREAD(L : inout LINE;
VALUE : out UNRESOLVED_ufixed;
GOOD : out BOOLEAN) is
constant hbv : INTEGER := (((maximum(3, (VALUE'high+1))+2)/3)*3)-1;
constant lbv : INTEGER := ((mine(0, VALUE'low)-2)/3)*3;
variable slv : STD_ULOGIC_VECTOR (hbv-lbv downto 0); -- high bits
variable valuex : UNRESOLVED_ufixed (hbv downto lbv);
variable igood : BOOLEAN;
variable i : INTEGER;
begin
VALUE := (VALUE'range => 'U');
OREAD_common ( L => L,
slv => slv,
igood => igood,
idex => i,
bpoint => -lbv,
message => false,
smath => false);
if (igood and -- We did not get another error
(i = -1) and -- We read everything, and high bits 0
(or (slv(hbv-lbv downto VALUE'high+1-lbv)) = '0')) then
valuex := to_ufixed (slv, hbv, lbv);
VALUE := valuex (VALUE'range);
good := true;
else
good := false;
end if;
end procedure OREAD;
procedure OREAD(L : inout LINE;
VALUE : out UNRESOLVED_sfixed) is
constant hbv : INTEGER := (((maximum(3, (VALUE'high+1))+2)/3)*3)-1;
constant lbv : INTEGER := ((mine(0, VALUE'low)-2)/3)*3;
variable slv : STD_ULOGIC_VECTOR (hbv-lbv downto 0); -- high bits
variable valuex : UNRESOLVED_sfixed (hbv downto lbv);
variable igood : BOOLEAN;
variable i : INTEGER;
begin
VALUE := (VALUE'range => 'U');
OREAD_common ( L => L,
slv => slv,
igood => igood,
idex => i,
bpoint => -lbv,
message => true,
smath => true);
if igood then -- We did not get another error
if not ((i = -1) and -- We read everything
((slv(VALUE'high-lbv) = '0' and -- sign bits = extra bits
or (slv(hbv-lbv downto VALUE'high+1-lbv)) = '0') or
(slv(VALUE'high-lbv) = '1' and
and (slv(hbv-lbv downto VALUE'high+1-lbv)) = '1'))) then
report fixed_generic_pkg'instance_name
& "OREAD(sfixed): Vector truncated."
severity error;
else
if (or (slv(VALUE'low-lbv-1 downto 0)) = '1') then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& "OREAD(sfixed): Vector truncated"
severity warning;
end if;
valuex := to_sfixed (slv, hbv, lbv);
VALUE := valuex (VALUE'range);
end if;
end if;
end procedure OREAD;
procedure OREAD(L : inout LINE;
VALUE : out UNRESOLVED_sfixed;
GOOD : out BOOLEAN) is
constant hbv : INTEGER := (((maximum(3, (VALUE'high+1))+2)/3)*3)-1;
constant lbv : INTEGER := ((mine(0, VALUE'low)-2)/3)*3;
variable slv : STD_ULOGIC_VECTOR (hbv-lbv downto 0); -- high bits
variable valuex : UNRESOLVED_sfixed (hbv downto lbv);
variable igood : BOOLEAN;
variable i : INTEGER;
begin
VALUE := (VALUE'range => 'U');
OREAD_common ( L => L,
slv => slv,
igood => igood,
idex => i,
bpoint => -lbv,
message => false,
smath => true);
if (igood -- We did not get another error
and (i = -1) -- We read everything
and ((slv(VALUE'high-lbv) = '0' and -- sign bits = extra bits
or (slv(hbv-lbv downto VALUE'high+1-lbv)) = '0') or
(slv(VALUE'high-lbv) = '1' and
and (slv(hbv-lbv downto VALUE'high+1-lbv)) = '1'))) then
valuex := to_sfixed (slv, hbv, lbv);
VALUE := valuex (VALUE'range);
good := true;
else
good := false;
end if;
end procedure OREAD;
-- hex read and write
procedure hwrite (
L : inout LINE; -- input line
VALUE : in UNRESOLVED_ufixed; -- fixed point input
JUSTIFIED : in SIDE := right;
FIELD : in WIDTH := 0) is
begin -- Example 03.30
write (L => L,
VALUE => to_hstring (VALUE),
JUSTIFIED => JUSTIFIED,
FIELD => FIELD);
end procedure hwrite;
-- purpose: writes fixed point into a line
procedure hwrite (
L : inout LINE; -- input line
VALUE : in UNRESOLVED_sfixed; -- fixed point input
JUSTIFIED : in SIDE := right;
FIELD : in WIDTH := 0) is
begin -- Example 03.30
write (L => L,
VALUE => to_hstring (VALUE),
JUSTIFIED => JUSTIFIED,
FIELD => FIELD);
end procedure hwrite;
-- Hex Read and Write procedures for STD_ULOGIC_VECTOR.
-- Modified from the original to be more forgiving.
procedure Char2QuadBits (C : CHARACTER;
RESULT : out STD_ULOGIC_VECTOR(3 downto 0);
GOOD : out BOOLEAN;
ISSUE_ERROR : in BOOLEAN) is
begin
case c is
when '0' => result := x"0"; good := true;
when '1' => result := x"1"; good := true;
when '2' => result := x"2"; good := true;
when '3' => result := x"3"; good := true;
when '4' => result := x"4"; good := true;
when '5' => result := x"5"; good := true;
when '6' => result := x"6"; good := true;
when '7' => result := x"7"; good := true;
when '8' => result := x"8"; good := true;
when '9' => result := x"9"; good := true;
when 'A' | 'a' => result := x"A"; good := true;
when 'B' | 'b' => result := x"B"; good := true;
when 'C' | 'c' => result := x"C"; good := true;
when 'D' | 'd' => result := x"D"; good := true;
when 'E' | 'e' => result := x"E"; good := true;
when 'F' | 'f' => result := x"F"; good := true;
when 'Z' => result := "ZZZZ"; good := true;
when 'X' => result := "XXXX"; good := true;
when others =>
assert not ISSUE_ERROR
report fixed_generic_pkg'instance_name
& "HREAD Error: Read a '" & c &
"', expected a Hex character (0-F)."
severity error;
result := "UUUU";
good := false;
end case;
end procedure Char2QuadBits;
-- purpose: Routines common to the HREAD routines
procedure HREAD_common (
L : inout LINE;
slv : out STD_ULOGIC_VECTOR;
igood : out BOOLEAN;
idex : out INTEGER;
constant bpoint : in INTEGER; -- binary point
constant message : in BOOLEAN;
constant smath : in BOOLEAN) is
-- purpose: error message routine
procedure errmes (
constant mess : in STRING) is -- error message
begin
if message then
if smath then
report fixed_generic_pkg'instance_name
& "HREAD(sfixed) "
& mess
severity error;
else
report fixed_generic_pkg'instance_name
& "HREAD(ufixed) "
& mess
severity error;
end if;
end if;
end procedure errmes;
variable xgood : BOOLEAN;
variable nybble : STD_ULOGIC_VECTOR (3 downto 0); -- 4 bits
variable c : CHARACTER;
variable i : INTEGER;
variable lastu : BOOLEAN := false; -- last character was an "_"
variable founddot : BOOLEAN := false; -- found a dot.
begin
Skip_whitespace (L);
if slv'length > 0 then
i := slv'high;
read (l, c, xgood);
while i > 0 loop
if xgood = false then
errmes ("Error: end of string encountered");
exit;
elsif c = '_' then
if i = slv'length then
errmes ("Error: String begins with an ""_""");
xgood := false;
exit;
elsif lastu then
errmes ("Error: Two underscores detected in input string ""__""");
xgood := false;
exit;
else
lastu := true;
end if;
elsif (c = '.') then
if (i + 1 /= bpoint) then
errmes ("encountered ""."" at wrong index");
xgood := false;
exit;
elsif i = slv'length then
errmes ("encounted a ""."" at the beginning of the line");
xgood := false;
exit;
elsif founddot then
errmes ("Two ""."" encounted in input string");
xgood := false;
exit;
end if;
founddot := true;
lastu := false;
else
Char2QuadBits(c, nybble, xgood, message);
if not xgood then
exit;
end if;
slv (i downto i-3) := nybble;
i := i - 4;
lastu := false;
end if;
if i > 0 then
read (L, c, xgood);
end if;
end loop;
idex := i;
igood := xgood;
else
idex := -1;
igood := true; -- read null string
end if;
end procedure HREAD_common;
procedure HREAD(L : inout LINE;
VALUE : out UNRESOLVED_ufixed) is
constant hbv : INTEGER := (((maximum(4, (VALUE'high+1))+3)/4)*4)-1;
constant lbv : INTEGER := ((mine(0, VALUE'low)-3)/4)*4;
variable slv : STD_ULOGIC_VECTOR (hbv-lbv downto 0); -- high bits
variable valuex : UNRESOLVED_ufixed (hbv downto lbv);
variable igood : BOOLEAN;
variable i : INTEGER;
begin
VALUE := (VALUE'range => 'U');
HREAD_common ( L => L,
slv => slv,
igood => igood,
idex => i,
bpoint => -lbv,
message => false,
smath => false);
if igood then
if not ((i = -1) and -- We read everything, and high bits 0
(or (slv(hbv-lbv downto VALUE'high+1-lbv)) = '0')) then
report fixed_generic_pkg'instance_name
& "HREAD(ufixed): Vector truncated."
severity error;
else
if (or (slv(VALUE'low-lbv-1 downto 0)) = '1') then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& "HREAD(ufixed): Vector truncated"
severity warning;
end if;
valuex := to_ufixed (slv, hbv, lbv);
VALUE := valuex (VALUE'range);
end if;
end if;
end procedure HREAD;
procedure HREAD(L : inout LINE;
VALUE : out UNRESOLVED_ufixed;
GOOD : out BOOLEAN) is
constant hbv : INTEGER := (((maximum(4, (VALUE'high+1))+3)/4)*4)-1;
constant lbv : INTEGER := ((mine(0, VALUE'low)-3)/4)*4;
variable slv : STD_ULOGIC_VECTOR (hbv-lbv downto 0); -- high bits
variable valuex : UNRESOLVED_ufixed (hbv downto lbv);
variable igood : BOOLEAN;
variable i : INTEGER;
begin
VALUE := (VALUE'range => 'U');
HREAD_common ( L => L,
slv => slv,
igood => igood,
idex => i,
bpoint => -lbv,
message => false,
smath => false);
if (igood and -- We did not get another error
(i = -1) and -- We read everything, and high bits 0
(or (slv(hbv-lbv downto VALUE'high+1-lbv)) = '0')) then
valuex := to_ufixed (slv, hbv, lbv);
VALUE := valuex (VALUE'range);
good := true;
else
good := false;
end if;
end procedure HREAD;
procedure HREAD(L : inout LINE;
VALUE : out UNRESOLVED_sfixed) is
constant hbv : INTEGER := (((maximum(4, (VALUE'high+1))+3)/4)*4)-1;
constant lbv : INTEGER := ((mine(0, VALUE'low)-3)/4)*4;
variable slv : STD_ULOGIC_VECTOR (hbv-lbv downto 0); -- high bits
variable valuex : UNRESOLVED_sfixed (hbv downto lbv);
variable igood : BOOLEAN;
variable i : INTEGER;
begin
VALUE := (VALUE'range => 'U');
HREAD_common ( L => L,
slv => slv,
igood => igood,
idex => i,
bpoint => -lbv,
message => true,
smath => true);
if igood then -- We did not get another error
if not ((i = -1) -- We read everything
and ((slv(VALUE'high-lbv) = '0' and -- sign bits = extra bits
or (slv(hbv-lbv downto VALUE'high+1-lbv)) = '0') or
(slv(VALUE'high-lbv) = '1' and
and (slv(hbv-lbv downto VALUE'high+1-lbv)) = '1'))) then
report fixed_generic_pkg'instance_name
& "HREAD(sfixed): Vector truncated."
severity error;
else
if (or (slv(VALUE'low-lbv-1 downto 0)) = '1') then
assert NO_WARNING
report fixed_generic_pkg'instance_name
& "HREAD(sfixed): Vector truncated"
severity warning;
end if;
valuex := to_sfixed (slv, hbv, lbv);
VALUE := valuex (VALUE'range);
end if;
end if;
end procedure HREAD;
procedure HREAD(L : inout LINE;
VALUE : out UNRESOLVED_sfixed;
GOOD : out BOOLEAN) is
constant hbv : INTEGER := (((maximum(4, (VALUE'high+1))+3)/4)*4)-1;
constant lbv : INTEGER := ((mine(0, VALUE'low)-3)/4)*4;
variable slv : STD_ULOGIC_VECTOR (hbv-lbv downto 0); -- high bits
variable valuex : UNRESOLVED_sfixed (hbv downto lbv);
variable igood : BOOLEAN;
variable i : INTEGER;
begin
VALUE := (VALUE'range => 'U');
HREAD_common ( L => L,
slv => slv,
igood => igood,
idex => i,
bpoint => -lbv,
message => false,
smath => true);
if (igood and -- We did not get another error
(i = -1) and -- We read everything
((slv(VALUE'high-lbv) = '0' and -- sign bits = extra bits
or (slv(hbv-lbv downto VALUE'high+1-lbv)) = '0') or
(slv(VALUE'high-lbv) = '1' and
and (slv(hbv-lbv downto VALUE'high+1-lbv)) = '1'))) then
valuex := to_sfixed (slv, hbv, lbv);
VALUE := valuex (VALUE'range);
good := true;
else
good := false;
end if;
end procedure HREAD;
-- To_string functions. Useful in "report" statements.
-- Example: report "result was " & to_string(result);
function to_string (value : UNRESOLVED_ufixed) return STRING is
variable s : STRING(1 to value'length +1) := (others => ' ');
variable subval : UNRESOLVED_ufixed (value'high downto -1);
variable sindx : INTEGER;
begin
if value'length < 1 then
return NUS;
else
if value'high < 0 then
if value(value'high) = 'Z' then
return to_string (resize (sfixed(value), 0, value'low));
else
return to_string (resize (value, 0, value'low));
end if;
elsif value'low >= 0 then
if Is_X (value(value'low)) then
subval := (others => value(value'low));
subval (value'range) := value;
return to_string(subval);
else
return to_string (resize (value, value'high, -1));
end if;
else
sindx := 1;
for i in value'high downto value'low loop
if i = -1 then
s(sindx) := '.';
sindx := sindx + 1;
end if;
s(sindx) := MVL9_to_char(STD_ULOGIC(value(i)));
sindx := sindx + 1;
end loop;
return s;
end if;
end if;
end function to_string;
function to_string (value : UNRESOLVED_sfixed) return STRING is
variable s : STRING(1 to value'length + 1) := (others => ' ');
variable subval : UNRESOLVED_sfixed (value'high downto -1);
variable sindx : INTEGER;
begin
if value'length < 1 then
return NUS;
else
if value'high < 0 then
return to_string (resize (value, 0, value'low));
elsif value'low >= 0 then
if Is_X (value(value'low)) then
subval := (others => value(value'low));
subval (value'range) := value;
return to_string(subval);
else
return to_string (resize (value, value'high, -1));
end if;
else
sindx := 1;
for i in value'high downto value'low loop
if i = -1 then
s(sindx) := '.';
sindx := sindx + 1;
end if;
s(sindx) := MVL9_to_char(STD_ULOGIC(value(i)));
sindx := sindx + 1;
end loop;
return s;
end if;
end if;
end function to_string;
function to_ostring (value : UNRESOLVED_ufixed) return STRING is
constant lne : INTEGER := (-VALUE'low+2)/3;
variable subval : UNRESOLVED_ufixed (value'high downto -3);
variable lpad : STD_ULOGIC_VECTOR (0 to (lne*3 + VALUE'low) -1);
variable slv : STD_ULOGIC_VECTOR (value'length-1 downto 0);
begin
if value'length < 1 then
return NUS;
else
if value'high < 0 then
if value(value'high) = 'Z' then
return to_ostring (resize (sfixed(value), 2, value'low));
else
return to_ostring (resize (value, 2, value'low));
end if;
elsif value'low >= 0 then
if Is_X (value(value'low)) then
subval := (others => value(value'low));
subval (value'range) := value;
return to_ostring(subval);
else
return to_ostring (resize (value, value'high, -3));
end if;
else
slv := to_sulv (value);
if Is_X (value (value'low)) then
lpad := (others => value (value'low));
else
lpad := (others => '0');
end if;
return to_ostring(slv(slv'high downto slv'high-VALUE'high))
& "."
& to_ostring(slv(slv'high-VALUE'high-1 downto 0) & lpad);
end if;
end if;
end function to_ostring;
function to_hstring (value : UNRESOLVED_ufixed) return STRING is
constant lne : INTEGER := (-VALUE'low+3)/4;
variable subval : UNRESOLVED_ufixed (value'high downto -4);
variable lpad : STD_ULOGIC_VECTOR (0 to (lne*4 + VALUE'low) -1);
variable slv : STD_ULOGIC_VECTOR (value'length-1 downto 0);
begin
if value'length < 1 then
return NUS;
else
if value'high < 0 then
if value(value'high) = 'Z' then
return to_hstring (resize (sfixed(value), 3, value'low));
else
return to_hstring (resize (value, 3, value'low));
end if;
elsif value'low >= 0 then
if Is_X (value(value'low)) then
subval := (others => value(value'low));
subval (value'range) := value;
return to_hstring(subval);
else
return to_hstring (resize (value, value'high, -4));
end if;
else
slv := to_sulv (value);
if Is_X (value (value'low)) then
lpad := (others => value(value'low));
else
lpad := (others => '0');
end if;
return to_hstring(slv(slv'high downto slv'high-VALUE'high))
& "."
& to_hstring(slv(slv'high-VALUE'high-1 downto 0)&lpad);
end if;
end if;
end function to_hstring;
function to_ostring (value : UNRESOLVED_sfixed) return STRING is
constant ne : INTEGER := ((value'high+1)+2)/3;
variable pad : STD_ULOGIC_VECTOR(0 to (ne*3 - (value'high+1)) - 1);
constant lne : INTEGER := (-VALUE'low+2)/3;
variable subval : UNRESOLVED_sfixed (value'high downto -3);
variable lpad : STD_ULOGIC_VECTOR (0 to (lne*3 + VALUE'low) -1);
variable slv : STD_ULOGIC_VECTOR (VALUE'high - VALUE'low downto 0);
begin
if value'length < 1 then
return NUS;
else
if value'high < 0 then
return to_ostring (resize (value, 2, value'low));
elsif value'low >= 0 then
if Is_X (value(value'low)) then
subval := (others => value(value'low));
subval (value'range) := value;
return to_ostring(subval);
else
return to_ostring (resize (value, value'high, -3));
end if;
else
pad := (others => value(value'high));
slv := to_sulv (value);
if Is_X (value (value'low)) then
lpad := (others => value(value'low));
else
lpad := (others => '0');
end if;
return to_ostring(pad & slv(slv'high downto slv'high-VALUE'high))
& "."
& to_ostring(slv(slv'high-VALUE'high-1 downto 0) & lpad);
end if;
end if;
end function to_ostring;
function to_hstring (value : UNRESOLVED_sfixed) return STRING is
constant ne : INTEGER := ((value'high+1)+3)/4;
variable pad : STD_ULOGIC_VECTOR(0 to (ne*4 - (value'high+1)) - 1);
constant lne : INTEGER := (-VALUE'low+3)/4;
variable subval : UNRESOLVED_sfixed (value'high downto -4);
variable lpad : STD_ULOGIC_VECTOR (0 to (lne*4 + VALUE'low) -1);
variable slv : STD_ULOGIC_VECTOR (value'length-1 downto 0);
begin
if value'length < 1 then
return NUS;
else
if value'high < 0 then
return to_hstring (resize (value, 3, value'low));
elsif value'low >= 0 then
if Is_X (value(value'low)) then
subval := (others => value(value'low));
subval (value'range) := value;
return to_hstring(subval);
else
return to_hstring (resize (value, value'high, -4));
end if;
else
slv := to_sulv (value);
pad := (others => value(value'high));
if Is_X (value (value'low)) then
lpad := (others => value(value'low));
else
lpad := (others => '0');
end if;
return to_hstring(pad & slv(slv'high downto slv'high-VALUE'high))
& "."
& to_hstring(slv(slv'high-VALUE'high-1 downto 0) & lpad);
end if;
end if;
end function to_hstring;
-- From string functions allow you to convert a string into a fixed
-- point number. Example:
-- signal uf1 : ufixed (3 downto -3);
-- uf1 <= from_string ("0110.100", uf1'high, uf1'low); -- 6.5
-- The "." is optional in this syntax, however it exist and is
-- in the wrong location an error is produced. Overflow will
-- result in saturation.
function from_string (
bstring : STRING; -- binary string
constant left_index : INTEGER;
constant right_index : INTEGER)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (left_index downto right_index);
variable L : LINE;
variable good : BOOLEAN;
begin
L := new STRING'(bstring);
read (L, result, good);
deallocate (L);
assert (good)
report fixed_generic_pkg'instance_name
& "from_string: Bad string "& bstring severity error;
return result;
end function from_string;
-- Octal and hex conversions work as follows:
-- uf1 <= from_hstring ("6.8", 3, -3); -- 6.5 (bottom zeros dropped)
-- uf1 <= from_ostring ("06.4", 3, -3); -- 6.5 (top zeros dropped)
function from_ostring (
ostring : STRING; -- Octal string
constant left_index : INTEGER;
constant right_index : INTEGER)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (left_index downto right_index);
variable L : LINE;
variable good : BOOLEAN;
begin
L := new STRING'(ostring);
oread (L, result, good);
deallocate (L);
assert (good)
report fixed_generic_pkg'instance_name
& "from_ostring: Bad string "& ostring severity error;
return result;
end function from_ostring;
function from_hstring (
hstring : STRING; -- hex string
constant left_index : INTEGER;
constant right_index : INTEGER)
return UNRESOLVED_ufixed
is
variable result : UNRESOLVED_ufixed (left_index downto right_index);
variable L : LINE;
variable good : BOOLEAN;
begin
L := new STRING'(hstring);
hread (L, result, good);
deallocate (L);
assert (good)
report fixed_generic_pkg'instance_name
& "from_hstring: Bad string "& hstring severity error;
return result;
end function from_hstring;
function from_string (
bstring : STRING; -- binary string
constant left_index : INTEGER;
constant right_index : INTEGER)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (left_index downto right_index);
variable L : LINE;
variable good : BOOLEAN;
begin
L := new STRING'(bstring);
read (L, result, good);
deallocate (L);
assert (good)
report fixed_generic_pkg'instance_name
& "from_string: Bad string "& bstring severity error;
return result;
end function from_string;
function from_ostring (
ostring : STRING; -- Octal string
constant left_index : INTEGER;
constant right_index : INTEGER)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (left_index downto right_index);
variable L : LINE;
variable good : BOOLEAN;
begin
L := new STRING'(ostring);
oread (L, result, good);
deallocate (L);
assert (good)
report fixed_generic_pkg'instance_name
& "from_ostring: Bad string "& ostring severity error;
return result;
end function from_ostring;
function from_hstring (
hstring : STRING; -- hex string
constant left_index : INTEGER;
constant right_index : INTEGER)
return UNRESOLVED_sfixed
is
variable result : UNRESOLVED_sfixed (left_index downto right_index);
variable L : LINE;
variable good : BOOLEAN;
begin
L := new STRING'(hstring);
hread (L, result, good);
deallocate (L);
assert (good)
report fixed_generic_pkg'instance_name
& "from_hstring: Bad string "& hstring severity error;
return result;
end function from_hstring;
-- Same as above, "size_res" is used for it's range only.
function from_string (
bstring : STRING; -- binary string
size_res : UNRESOLVED_ufixed)
return UNRESOLVED_ufixed is
begin
return from_string (bstring, size_res'high, size_res'low);
end function from_string;
function from_ostring (
ostring : STRING; -- Octal string
size_res : UNRESOLVED_ufixed)
return UNRESOLVED_ufixed is
begin
return from_ostring (ostring, size_res'high, size_res'low);
end function from_ostring;
function from_hstring (
hstring : STRING; -- hex string
size_res : UNRESOLVED_ufixed)
return UNRESOLVED_ufixed is
begin
return from_hstring(hstring, size_res'high, size_res'low);
end function from_hstring;
function from_string (
bstring : STRING; -- binary string
size_res : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed is
begin
return from_string (bstring, size_res'high, size_res'low);
end function from_string;
function from_ostring (
ostring : STRING; -- Octal string
size_res : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed is
begin
return from_ostring (ostring, size_res'high, size_res'low);
end function from_ostring;
function from_hstring (
hstring : STRING; -- hex string
size_res : UNRESOLVED_sfixed)
return UNRESOLVED_sfixed is
begin
return from_hstring (hstring, size_res'high, size_res'low);
end function from_hstring;
-- Direct conversion functions. Example:
-- signal uf1 : ufixed (3 downto -3);
-- uf1 <= from_string ("0110.100"); -- 6.5
-- In this case the "." is not optional, and the size of
-- the output must match exactly.
-- purpose: Calculate the string boundaries
procedure calculate_string_boundry (
arg : in STRING; -- input string
left_index : out INTEGER; -- left
right_index : out INTEGER) is -- right
-- examples "10001.111" would return +4, -3
-- "07X.44" would return +2, -2 (then the octal routine would multiply)
-- "A_B_._C" would return +1, -1 (then the hex routine would multiply)
alias xarg : STRING (arg'length downto 1) is arg; -- make it downto range
variable l, r : INTEGER; -- internal indexes
variable founddot : BOOLEAN := false;
begin
if arg'length > 0 then
l := xarg'high - 1;
r := 0;
for i in xarg'range loop
if xarg(i) = '_' then
if r = 0 then
l := l - 1;
else
r := r + 1;
end if;
elsif xarg(i) = ' ' or xarg(i) = NBSP or xarg(i) = HT then
report fixed_generic_pkg'instance_name
& "Found a space in the input STRING " & xarg
severity error;
elsif xarg(i) = '.' then
if founddot then
report fixed_generic_pkg'instance_name
& "Found two binary points in input string " & xarg
severity error;
else
l := l - i;
r := -i + 1;
founddot := true;
end if;
end if;
end loop;
left_index := l;
right_index := r;
else
left_index := 0;
right_index := 0;
end if;
end procedure calculate_string_boundry;
-- Direct conversion functions. Example:
-- signal uf1 : ufixed (3 downto -3);
-- uf1 <= from_string ("0110.100"); -- 6.5
-- In this case the "." is not optional, and the size of
-- the output must match exactly.
function from_string (
bstring : STRING) -- binary string
return UNRESOLVED_ufixed
is
variable left_index, right_index : INTEGER;
begin
calculate_string_boundry (bstring, left_index, right_index);
return from_string (bstring, left_index, right_index);
end function from_string;
-- Direct octal and hex conversion functions. In this case
-- the string lengths must match. Example:
-- signal sf1 := sfixed (5 downto -3);
-- sf1 <= from_ostring ("71.4") -- -6.5
function from_ostring (
ostring : STRING) -- Octal string
return UNRESOLVED_ufixed
is
variable left_index, right_index : INTEGER;
begin
calculate_string_boundry (ostring, left_index, right_index);
return from_ostring (ostring, ((left_index+1)*3)-1, right_index*3);
end function from_ostring;
function from_hstring (
hstring : STRING) -- hex string
return UNRESOLVED_ufixed
is
variable left_index, right_index : INTEGER;
begin
calculate_string_boundry (hstring, left_index, right_index);
return from_hstring (hstring, ((left_index+1)*4)-1, right_index*4);
end function from_hstring;
function from_string (
bstring : STRING) -- binary string
return UNRESOLVED_sfixed
is
variable left_index, right_index : INTEGER;
begin
calculate_string_boundry (bstring, left_index, right_index);
return from_string (bstring, left_index, right_index);
end function from_string;
function from_ostring (
ostring : STRING) -- Octal string
return UNRESOLVED_sfixed
is
variable left_index, right_index : INTEGER;
begin
calculate_string_boundry (ostring, left_index, right_index);
return from_ostring (ostring, ((left_index+1)*3)-1, right_index*3);
end function from_ostring;
function from_hstring (
hstring : STRING) -- hex string
return UNRESOLVED_sfixed
is
variable left_index, right_index : INTEGER;
begin
calculate_string_boundry (hstring, left_index, right_index);
return from_hstring (hstring, ((left_index+1)*4)-1, right_index*4);
end function from_hstring;
end package body fixed_generic_pkg;
|
----------------------------------------------------------------------------
-- This file is a part of the GRLIB VHDL IP LIBRARY
-- Copyright (C) 2004 GAISLER RESEARCH
--
-- This program is free software; you can redistribute it and/or modify
-- it under the terms of the GNU General Public License as published by
-- the Free Software Foundation; either version 2 of the License, or
-- (at your option) any later version.
--
-- See the file COPYING for the full details of the license.
--
-----------------------------------------------------------------------------
-- package: misc
-- File: misc.vhd
-- Author: Jiri Gaisler - Gaisler Research
-- Description: Misc cores from LEON2
------------------------------------------------------------------------------
library ieee;
use ieee.std_logic_1164.all;
library grlib;
use grlib.amba.all;
library gaisler;
use gaisler.uart.all;
package misc_esa is
component l2uart
generic (
pindex : integer := 0;
paddr : integer := 0;
pmask : integer := 16#fff#;
console : integer := 0;
pirq : integer := 0
);
port (
rst : in std_ulogic;
clk : in std_ulogic;
apbi : in apb_slv_in_type;
apbo : out apb_slv_out_type;
uarti : in uart_in_type;
uarto : out uart_out_type);
end component;
end;
|
----------------------------------------------------------------------------
-- This file is a part of the GRLIB VHDL IP LIBRARY
-- Copyright (C) 2004 GAISLER RESEARCH
--
-- This program is free software; you can redistribute it and/or modify
-- it under the terms of the GNU General Public License as published by
-- the Free Software Foundation; either version 2 of the License, or
-- (at your option) any later version.
--
-- See the file COPYING for the full details of the license.
--
-----------------------------------------------------------------------------
-- package: misc
-- File: misc.vhd
-- Author: Jiri Gaisler - Gaisler Research
-- Description: Misc cores from LEON2
------------------------------------------------------------------------------
library ieee;
use ieee.std_logic_1164.all;
library grlib;
use grlib.amba.all;
library gaisler;
use gaisler.uart.all;
package misc_esa is
component l2uart
generic (
pindex : integer := 0;
paddr : integer := 0;
pmask : integer := 16#fff#;
console : integer := 0;
pirq : integer := 0
);
port (
rst : in std_ulogic;
clk : in std_ulogic;
apbi : in apb_slv_in_type;
apbo : out apb_slv_out_type;
uarti : in uart_in_type;
uarto : out uart_out_type);
end component;
end;
|
architecture RTL of FIFO is
begin
BLOCK_LABEL : block is
begin
end block;
BLOCK_LABEL : block is
begin
end block;
end architecture RTL;
|
--------------------------------------------------------------------------
-- --
-- Copyright (c) 1990,1991,1992 by Synopsys, Inc. All rights reserved. --
-- --
-- This source file may be used and distributed without restriction --
-- provided that this copyright statement is not removed from the file --
-- and that any derivative work contains this copyright notice. --
-- --
-- Package name: STD_LOGIC_ARITH --
-- --
-- Purpose: --
-- A set of arithemtic, conversion, and comparison functions --
-- for SIGNED, UNSIGNED, SMALL_INT, INTEGER, --
-- STD_ULOGIC, STD_LOGIC, and STD_LOGIC_VECTOR. --
-- --
--------------------------------------------------------------------------
library IEEE;
use IEEE.std_logic_1164.all;
package std_logic_arith is
type UNSIGNED is array (NATURAL range <>) of STD_LOGIC;
type SIGNED is array (NATURAL range <>) of STD_LOGIC;
subtype SMALL_INT is INTEGER range 0 to 1;
function "+"(L: UNSIGNED; R: UNSIGNED) return UNSIGNED;
function "+"(L: SIGNED; R: SIGNED) return SIGNED;
function "+"(L: UNSIGNED; R: SIGNED) return SIGNED;
function "+"(L: SIGNED; R: UNSIGNED) return SIGNED;
function "+"(L: UNSIGNED; R: INTEGER) return UNSIGNED;
function "+"(L: INTEGER; R: UNSIGNED) return UNSIGNED;
function "+"(L: SIGNED; R: INTEGER) return SIGNED;
function "+"(L: INTEGER; R: SIGNED) return SIGNED;
function "+"(L: UNSIGNED; R: STD_ULOGIC) return UNSIGNED;
function "+"(L: STD_ULOGIC; R: UNSIGNED) return UNSIGNED;
function "+"(L: SIGNED; R: STD_ULOGIC) return SIGNED;
function "+"(L: STD_ULOGIC; R: SIGNED) return SIGNED;
function "+"(L: UNSIGNED; R: UNSIGNED) return STD_LOGIC_VECTOR;
function "+"(L: SIGNED; R: SIGNED) return STD_LOGIC_VECTOR;
function "+"(L: UNSIGNED; R: SIGNED) return STD_LOGIC_VECTOR;
function "+"(L: SIGNED; R: UNSIGNED) return STD_LOGIC_VECTOR;
function "+"(L: UNSIGNED; R: INTEGER) return STD_LOGIC_VECTOR;
function "+"(L: INTEGER; R: UNSIGNED) return STD_LOGIC_VECTOR;
function "+"(L: SIGNED; R: INTEGER) return STD_LOGIC_VECTOR;
function "+"(L: INTEGER; R: SIGNED) return STD_LOGIC_VECTOR;
function "+"(L: UNSIGNED; R: STD_ULOGIC) return STD_LOGIC_VECTOR;
function "+"(L: STD_ULOGIC; R: UNSIGNED) return STD_LOGIC_VECTOR;
function "+"(L: SIGNED; R: STD_ULOGIC) return STD_LOGIC_VECTOR;
function "+"(L: STD_ULOGIC; R: SIGNED) return STD_LOGIC_VECTOR;
function "-"(L: UNSIGNED; R: UNSIGNED) return UNSIGNED;
function "-"(L: SIGNED; R: SIGNED) return SIGNED;
function "-"(L: UNSIGNED; R: SIGNED) return SIGNED;
function "-"(L: SIGNED; R: UNSIGNED) return SIGNED;
function "-"(L: UNSIGNED; R: INTEGER) return UNSIGNED;
function "-"(L: INTEGER; R: UNSIGNED) return UNSIGNED;
function "-"(L: SIGNED; R: INTEGER) return SIGNED;
function "-"(L: INTEGER; R: SIGNED) return SIGNED;
function "-"(L: UNSIGNED; R: STD_ULOGIC) return UNSIGNED;
function "-"(L: STD_ULOGIC; R: UNSIGNED) return UNSIGNED;
function "-"(L: SIGNED; R: STD_ULOGIC) return SIGNED;
function "-"(L: STD_ULOGIC; R: SIGNED) return SIGNED;
function "-"(L: UNSIGNED; R: UNSIGNED) return STD_LOGIC_VECTOR;
function "-"(L: SIGNED; R: SIGNED) return STD_LOGIC_VECTOR;
function "-"(L: UNSIGNED; R: SIGNED) return STD_LOGIC_VECTOR;
function "-"(L: SIGNED; R: UNSIGNED) return STD_LOGIC_VECTOR;
function "-"(L: UNSIGNED; R: INTEGER) return STD_LOGIC_VECTOR;
function "-"(L: INTEGER; R: UNSIGNED) return STD_LOGIC_VECTOR;
function "-"(L: SIGNED; R: INTEGER) return STD_LOGIC_VECTOR;
function "-"(L: INTEGER; R: SIGNED) return STD_LOGIC_VECTOR;
function "-"(L: UNSIGNED; R: STD_ULOGIC) return STD_LOGIC_VECTOR;
function "-"(L: STD_ULOGIC; R: UNSIGNED) return STD_LOGIC_VECTOR;
function "-"(L: SIGNED; R: STD_ULOGIC) return STD_LOGIC_VECTOR;
function "-"(L: STD_ULOGIC; R: SIGNED) return STD_LOGIC_VECTOR;
function "+"(L: UNSIGNED) return UNSIGNED;
function "+"(L: SIGNED) return SIGNED;
function "-"(L: SIGNED) return SIGNED;
function "ABS"(L: SIGNED) return SIGNED;
function "+"(L: UNSIGNED) return STD_LOGIC_VECTOR;
function "+"(L: SIGNED) return STD_LOGIC_VECTOR;
function "-"(L: SIGNED) return STD_LOGIC_VECTOR;
function "ABS"(L: SIGNED) return STD_LOGIC_VECTOR;
function "*"(L: UNSIGNED; R: UNSIGNED) return UNSIGNED;
function "*"(L: SIGNED; R: SIGNED) return SIGNED;
function "*"(L: SIGNED; R: UNSIGNED) return SIGNED;
function "*"(L: UNSIGNED; R: SIGNED) return SIGNED;
function "*"(L: UNSIGNED; R: UNSIGNED) return STD_LOGIC_VECTOR;
function "*"(L: SIGNED; R: SIGNED) return STD_LOGIC_VECTOR;
function "*"(L: SIGNED; R: UNSIGNED) return STD_LOGIC_VECTOR;
function "*"(L: UNSIGNED; R: SIGNED) return STD_LOGIC_VECTOR;
function "<"(L: UNSIGNED; R: UNSIGNED) return BOOLEAN;
function "<"(L: SIGNED; R: SIGNED) return BOOLEAN;
function "<"(L: UNSIGNED; R: SIGNED) return BOOLEAN;
function "<"(L: SIGNED; R: UNSIGNED) return BOOLEAN;
function "<"(L: UNSIGNED; R: INTEGER) return BOOLEAN;
function "<"(L: INTEGER; R: UNSIGNED) return BOOLEAN;
function "<"(L: SIGNED; R: INTEGER) return BOOLEAN;
function "<"(L: INTEGER; R: SIGNED) return BOOLEAN;
function "<="(L: UNSIGNED; R: UNSIGNED) return BOOLEAN;
function "<="(L: SIGNED; R: SIGNED) return BOOLEAN;
function "<="(L: UNSIGNED; R: SIGNED) return BOOLEAN;
function "<="(L: SIGNED; R: UNSIGNED) return BOOLEAN;
function "<="(L: UNSIGNED; R: INTEGER) return BOOLEAN;
function "<="(L: INTEGER; R: UNSIGNED) return BOOLEAN;
function "<="(L: SIGNED; R: INTEGER) return BOOLEAN;
function "<="(L: INTEGER; R: SIGNED) return BOOLEAN;
function ">"(L: UNSIGNED; R: UNSIGNED) return BOOLEAN;
function ">"(L: SIGNED; R: SIGNED) return BOOLEAN;
function ">"(L: UNSIGNED; R: SIGNED) return BOOLEAN;
function ">"(L: SIGNED; R: UNSIGNED) return BOOLEAN;
function ">"(L: UNSIGNED; R: INTEGER) return BOOLEAN;
function ">"(L: INTEGER; R: UNSIGNED) return BOOLEAN;
function ">"(L: SIGNED; R: INTEGER) return BOOLEAN;
function ">"(L: INTEGER; R: SIGNED) return BOOLEAN;
function ">="(L: UNSIGNED; R: UNSIGNED) return BOOLEAN;
function ">="(L: SIGNED; R: SIGNED) return BOOLEAN;
function ">="(L: UNSIGNED; R: SIGNED) return BOOLEAN;
function ">="(L: SIGNED; R: UNSIGNED) return BOOLEAN;
function ">="(L: UNSIGNED; R: INTEGER) return BOOLEAN;
function ">="(L: INTEGER; R: UNSIGNED) return BOOLEAN;
function ">="(L: SIGNED; R: INTEGER) return BOOLEAN;
function ">="(L: INTEGER; R: SIGNED) return BOOLEAN;
function "="(L: UNSIGNED; R: UNSIGNED) return BOOLEAN;
function "="(L: SIGNED; R: SIGNED) return BOOLEAN;
function "="(L: UNSIGNED; R: SIGNED) return BOOLEAN;
function "="(L: SIGNED; R: UNSIGNED) return BOOLEAN;
function "="(L: UNSIGNED; R: INTEGER) return BOOLEAN;
function "="(L: INTEGER; R: UNSIGNED) return BOOLEAN;
function "="(L: SIGNED; R: INTEGER) return BOOLEAN;
function "="(L: INTEGER; R: SIGNED) return BOOLEAN;
function "/="(L: UNSIGNED; R: UNSIGNED) return BOOLEAN;
function "/="(L: SIGNED; R: SIGNED) return BOOLEAN;
function "/="(L: UNSIGNED; R: SIGNED) return BOOLEAN;
function "/="(L: SIGNED; R: UNSIGNED) return BOOLEAN;
function "/="(L: UNSIGNED; R: INTEGER) return BOOLEAN;
function "/="(L: INTEGER; R: UNSIGNED) return BOOLEAN;
function "/="(L: SIGNED; R: INTEGER) return BOOLEAN;
function "/="(L: INTEGER; R: SIGNED) return BOOLEAN;
function SHL(ARG: UNSIGNED; COUNT: UNSIGNED) return UNSIGNED;
function SHL(ARG: SIGNED; COUNT: UNSIGNED) return SIGNED;
function SHR(ARG: UNSIGNED; COUNT: UNSIGNED) return UNSIGNED;
function SHR(ARG: SIGNED; COUNT: UNSIGNED) return SIGNED;
function CONV_INTEGER(ARG: INTEGER) return INTEGER;
function CONV_INTEGER(ARG: UNSIGNED) return INTEGER;
function CONV_INTEGER(ARG: SIGNED) return INTEGER;
function CONV_INTEGER(ARG: STD_ULOGIC) return SMALL_INT;
function CONV_UNSIGNED(ARG: INTEGER; SIZE: INTEGER) return UNSIGNED;
function CONV_UNSIGNED(ARG: UNSIGNED; SIZE: INTEGER) return UNSIGNED;
function CONV_UNSIGNED(ARG: SIGNED; SIZE: INTEGER) return UNSIGNED;
function CONV_UNSIGNED(ARG: STD_ULOGIC; SIZE: INTEGER) return UNSIGNED;
function CONV_SIGNED(ARG: INTEGER; SIZE: INTEGER) return SIGNED;
function CONV_SIGNED(ARG: UNSIGNED; SIZE: INTEGER) return SIGNED;
function CONV_SIGNED(ARG: SIGNED; SIZE: INTEGER) return SIGNED;
function CONV_SIGNED(ARG: STD_ULOGIC; SIZE: INTEGER) return SIGNED;
function CONV_STD_LOGIC_VECTOR(ARG: INTEGER; SIZE: INTEGER)
return STD_LOGIC_VECTOR;
function CONV_STD_LOGIC_VECTOR(ARG: UNSIGNED; SIZE: INTEGER)
return STD_LOGIC_VECTOR;
function CONV_STD_LOGIC_VECTOR(ARG: SIGNED; SIZE: INTEGER)
return STD_LOGIC_VECTOR;
function CONV_STD_LOGIC_VECTOR(ARG: STD_ULOGIC; SIZE: INTEGER)
return STD_LOGIC_VECTOR;
-- zero extend STD_LOGIC_VECTOR (ARG) to SIZE,
-- SIZE < 0 is same as SIZE = 0
-- returns STD_LOGIC_VECTOR(SIZE-1 downto 0)
function EXT(ARG: STD_LOGIC_VECTOR; SIZE: INTEGER) return STD_LOGIC_VECTOR;
-- sign extend STD_LOGIC_VECTOR (ARG) to SIZE,
-- SIZE < 0 is same as SIZE = 0
-- return STD_LOGIC_VECTOR(SIZE-1 downto 0)
function SXT(ARG: STD_LOGIC_VECTOR; SIZE: INTEGER) return STD_LOGIC_VECTOR;
end Std_logic_arith;
library IEEE;
use IEEE.std_logic_1164.all;
package body std_logic_arith is
function max(L, R: INTEGER) return INTEGER is
begin
if L > R then
return L;
else
return R;
end if;
end;
function min(L, R: INTEGER) return INTEGER is
begin
if L < R then
return L;
else
return R;
end if;
end;
-- --synopsys synthesis_off
type tbl_type is array (STD_ULOGIC) of STD_ULOGIC;
constant tbl_BINARY : tbl_type :=
('X', 'X', '0', '1', 'X', 'X', '0', '1', 'X');
-- --synopsys synthesis_on
-- --synopsys synthesis_off
type tbl_mvl9_boolean is array (STD_ULOGIC) of boolean;
constant IS_X : tbl_mvl9_boolean :=
(true, true, false, false, true, true, false, false, true);
-- --synopsys synthesis_on
function MAKE_BINARY(A : STD_ULOGIC) return STD_ULOGIC is
-- --synopsys built_in SYN_FEED_THRU
begin
-- --synopsys synthesis_off
if (IS_X(A)) then
assert false
report "There is an 'U'|'X'|'W'|'Z'|'-' in an arithmetic operand, the result will be 'X'(es)."
severity warning;
return ('X');
end if;
return tbl_BINARY(A);
-- --synopsys synthesis_on
end;
function MAKE_BINARY(A : UNSIGNED) return UNSIGNED is
-- --synopsys built_in SYN_FEED_THRU
variable one_bit : STD_ULOGIC;
variable result : UNSIGNED (A'range);
begin
-- --synopsys synthesis_off
for i in A'range loop
if (IS_X(A(i))) then
assert false
report "There is an 'U'|'X'|'W'|'Z'|'-' in an arithmetic operand, the result will be 'X'(es)."
severity warning;
result := (others => 'X');
return result;
end if;
result(i) := tbl_BINARY(A(i));
end loop;
return result;
-- --synopsys synthesis_on
end;
function MAKE_BINARY(A : UNSIGNED) return SIGNED is
-- --synopsys built_in SYN_FEED_THRU
variable one_bit : STD_ULOGIC;
variable result : SIGNED (A'range);
begin
-- --synopsys synthesis_off
for i in A'range loop
if (IS_X(A(i))) then
assert false
report "There is an 'U'|'X'|'W'|'Z'|'-' in an arithmetic operand, the result will be 'X'(es)."
severity warning;
result := (others => 'X');
return result;
end if;
result(i) := tbl_BINARY(A(i));
end loop;
return result;
-- --synopsys synthesis_on
end;
function MAKE_BINARY(A : SIGNED) return UNSIGNED is
-- --synopsys built_in SYN_FEED_THRU
variable one_bit : STD_ULOGIC;
variable result : UNSIGNED (A'range);
begin
-- --synopsys synthesis_off
for i in A'range loop
if (IS_X(A(i))) then
assert false
report "There is an 'U'|'X'|'W'|'Z'|'-' in an arithmetic operand, the result will be 'X'(es)."
severity warning;
result := (others => 'X');
return result;
end if;
result(i) := tbl_BINARY(A(i));
end loop;
return result;
-- --synopsys synthesis_on
end;
function MAKE_BINARY(A : SIGNED) return SIGNED is
-- --synopsys built_in SYN_FEED_THRU
variable one_bit : STD_ULOGIC;
variable result : SIGNED (A'range);
begin
-- --synopsys synthesis_off
for i in A'range loop
if (IS_X(A(i))) then
assert false
report "There is an 'U'|'X'|'W'|'Z'|'-' in an arithmetic operand, the result will be 'X'(es)."
severity warning;
result := (others => 'X');
return result;
end if;
result(i) := tbl_BINARY(A(i));
end loop;
return result;
-- --synopsys synthesis_on
end;
function MAKE_BINARY(A : STD_LOGIC_VECTOR) return STD_LOGIC_VECTOR is
-- --synopsys built_in SYN_FEED_THRU
variable one_bit : STD_ULOGIC;
variable result : STD_LOGIC_VECTOR (A'range);
begin
-- --synopsys synthesis_off
for i in A'range loop
if (IS_X(A(i))) then
assert false
report "There is an 'U'|'X'|'W'|'Z'|'-' in an arithmetic operand, the result will be 'X'(es)."
severity warning;
result := (others => 'X');
return result;
end if;
result(i) := tbl_BINARY(A(i));
end loop;
return result;
-- --synopsys synthesis_on
end;
function MAKE_BINARY(A : UNSIGNED) return STD_LOGIC_VECTOR is
-- --synopsys built_in SYN_FEED_THRU
variable one_bit : STD_ULOGIC;
variable result : STD_LOGIC_VECTOR (A'range);
begin
-- --synopsys synthesis_off
for i in A'range loop
if (IS_X(A(i))) then
assert false
report "There is an 'U'|'X'|'W'|'Z'|'-' in an arithmetic operand, the result will be 'X'(es)."
severity warning;
result := (others => 'X');
return result;
end if;
result(i) := tbl_BINARY(A(i));
end loop;
return result;
-- --synopsys synthesis_on
end;
function MAKE_BINARY(A : SIGNED) return STD_LOGIC_VECTOR is
-- --synopsys built_in SYN_FEED_THRU
variable one_bit : STD_ULOGIC;
variable result : STD_LOGIC_VECTOR (A'range);
begin
-- --synopsys synthesis_off
for i in A'range loop
if (IS_X(A(i))) then
assert false
report "There is an 'U'|'X'|'W'|'Z'|'-' in an arithmetic operand, the result will be 'X'(es)."
severity warning;
result := (others => 'X');
return result;
end if;
result(i) := tbl_BINARY(A(i));
end loop;
return result;
-- --synopsys synthesis_on
end;
-- Type propagation function which returns a signed type with the
-- size of the left arg.
function LEFT_SIGNED_ARG(A,B: SIGNED) return SIGNED is
variable Z: SIGNED (A'left downto 0);
-- pragma return_port_name Z
begin
return(Z);
end;
-- Type propagation function which returns an unsigned type with the
-- size of the left arg.
function LEFT_UNSIGNED_ARG(A,B: UNSIGNED) return UNSIGNED is
variable Z: UNSIGNED (A'left downto 0);
-- pragma return_port_name Z
begin
return(Z);
end;
-- Type propagation function which returns a signed type with the
-- size of the result of a signed multiplication
function MULT_SIGNED_ARG(A,B: SIGNED) return SIGNED is
variable Z: SIGNED ((A'length+B'length-1) downto 0);
-- pragma return_port_name Z
begin
return(Z);
end;
-- Type propagation function which returns an unsigned type with the
-- size of the result of a unsigned multiplication
function MULT_UNSIGNED_ARG(A,B: UNSIGNED) return UNSIGNED is
variable Z: UNSIGNED ((A'length+B'length-1) downto 0);
-- pragma return_port_name Z
begin
return(Z);
end;
function mult(A,B: SIGNED) return SIGNED is
variable BA: SIGNED((A'length+B'length-1) downto 0);
variable PA: SIGNED((A'length+B'length-1) downto 0);
variable AA: SIGNED(A'length downto 0);
variable neg: STD_ULOGIC;
constant one : UNSIGNED(1 downto 0) := "01";
-- pragma map_to_operator MULT_TC_OP
-- pragma type_function MULT_SIGNED_ARG
-- pragma return_port_name Z
begin
if (A(A'left) = 'X' or B(B'left) = 'X') then
PA := (others => 'X');
return(PA);
end if;
PA := (others => '0');
neg := B(B'left) xor A(A'left);
BA := CONV_SIGNED(('0' & ABS(B)),(A'length+B'length));
AA := '0' & ABS(A);
for i in integer range 0 to A'length-1 loop
if AA(i) = '1' then
PA := PA+BA;
end if;
BA := SHL(BA,one);
end loop;
if (neg= '1') then
return(-PA);
else
return(PA);
end if;
end;
function mult(A,B: UNSIGNED) return UNSIGNED is
variable BA: UNSIGNED((A'length+B'length-1) downto 0);
variable PA: UNSIGNED((A'length+B'length-1) downto 0);
constant one : UNSIGNED(1 downto 0) := "01";
-- pragma map_to_operator MULT_UNS_OP
-- pragma type_function MULT_UNSIGNED_ARG
-- pragma return_port_name Z
begin
if (A(A'left) = 'X' or B(B'left) = 'X') then
PA := (others => 'X');
return(PA);
end if;
PA := (others => '0');
BA := CONV_UNSIGNED(B,(A'length+B'length));
for i in integer range 0 to A'length-1 loop
if A(i) = '1' then
PA := PA+BA;
end if;
BA := SHL(BA,one);
end loop;
return(PA);
end;
-- subtract two signed numbers of the same length
-- both arrays must have range (msb downto 0)
function minus(A, B: SIGNED) return SIGNED is
variable carry: STD_ULOGIC;
variable BV: STD_ULOGIC_VECTOR (A'left downto 0);
variable sum: SIGNED (A'left downto 0);
-- pragma map_to_operator SUB_TC_OP
-- pragma type_function LEFT_SIGNED_ARG
-- pragma return_port_name Z
begin
if (A(A'left) = 'X' or B(B'left) = 'X') then
sum := (others => 'X');
return(sum);
end if;
carry := '1';
BV := not STD_ULOGIC_VECTOR(B);
for i in 0 to A'left loop
sum(i) := A(i) xor BV(i) xor carry;
carry := (A(i) and BV(i)) or
(A(i) and carry) or
(carry and BV(i));
end loop;
return sum;
end;
-- add two signed numbers of the same length
-- both arrays must have range (msb downto 0)
function plus(A, B: SIGNED) return SIGNED is
variable carry: STD_ULOGIC;
variable BV, sum: SIGNED (A'left downto 0);
-- pragma map_to_operator ADD_TC_OP
-- pragma type_function LEFT_SIGNED_ARG
-- pragma return_port_name Z
begin
if (A(A'left) = 'X' or B(B'left) = 'X') then
sum := (others => 'X');
return(sum);
end if;
carry := '0';
BV := B;
for i in 0 to A'left loop
sum(i) := A(i) xor BV(i) xor carry;
carry := (A(i) and BV(i)) or
(A(i) and carry) or
(carry and BV(i));
end loop;
return sum;
end;
-- subtract two unsigned numbers of the same length
-- both arrays must have range (msb downto 0)
function unsigned_minus(A, B: UNSIGNED) return UNSIGNED is
variable carry: STD_ULOGIC;
variable BV: STD_ULOGIC_VECTOR (A'left downto 0);
variable sum: UNSIGNED (A'left downto 0);
-- pragma map_to_operator SUB_UNS_OP
-- pragma type_function LEFT_UNSIGNED_ARG
-- pragma return_port_name Z
begin
if (A(A'left) = 'X' or B(B'left) = 'X') then
sum := (others => 'X');
return(sum);
end if;
carry := '1';
BV := not STD_ULOGIC_VECTOR(B);
for i in 0 to A'left loop
sum(i) := A(i) xor BV(i) xor carry;
carry := (A(i) and BV(i)) or
(A(i) and carry) or
(carry and BV(i));
end loop;
return sum;
end;
-- add two unsigned numbers of the same length
-- both arrays must have range (msb downto 0)
function unsigned_plus(A, B: UNSIGNED) return UNSIGNED is
variable carry: STD_ULOGIC;
variable BV, sum: UNSIGNED (A'left downto 0);
-- pragma map_to_operator ADD_UNS_OP
-- pragma type_function LEFT_UNSIGNED_ARG
-- pragma return_port_name Z
begin
if (A(A'left) = 'X' or B(B'left) = 'X') then
sum := (others => 'X');
return(sum);
end if;
carry := '0';
BV := B;
for i in 0 to A'left loop
sum(i) := A(i) xor BV(i) xor carry;
carry := (A(i) and BV(i)) or
(A(i) and carry) or
(carry and BV(i));
end loop;
return sum;
end;
function "*"(L: SIGNED; R: SIGNED) return SIGNED is
-- pragma label_applies_to mult
-- --synopsys subpgm_id 296
begin
return mult(CONV_SIGNED(L, L'length),
CONV_SIGNED(R, R'length)); -- pragma label mult
end;
function "*"(L: UNSIGNED; R: UNSIGNED) return UNSIGNED is
-- pragma label_applies_to mult
-- --synopsys subpgm_id 295
begin
return mult(CONV_UNSIGNED(L, L'length),
CONV_UNSIGNED(R, R'length)); -- pragma label mult
end;
function "*"(L: UNSIGNED; R: SIGNED) return SIGNED is
-- pragma label_applies_to mult
-- --synopsys subpgm_id 297
begin
return mult(CONV_SIGNED(L, L'length+1),
CONV_SIGNED(R, R'length)); -- pragma label mult
end;
function "*"(L: SIGNED; R: UNSIGNED) return SIGNED is
-- pragma label_applies_to mult
-- --synopsys subpgm_id 298
begin
return mult(CONV_SIGNED(L, L'length),
CONV_SIGNED(R, R'length+1)); -- pragma label mult
end;
function "*"(L: SIGNED; R: SIGNED) return STD_LOGIC_VECTOR is
-- pragma label_applies_to mult
-- --synopsys subpgm_id 301
begin
return STD_LOGIC_VECTOR (
mult(-- pragma label mult
CONV_SIGNED(L, L'length), CONV_SIGNED(R, R'length)));
end;
function "*"(L: UNSIGNED; R: UNSIGNED) return STD_LOGIC_VECTOR is
-- pragma label_applies_to mult
-- --synopsys subpgm_id 300
begin
return STD_LOGIC_VECTOR (
mult(-- pragma label mult
CONV_UNSIGNED(L, L'length), CONV_UNSIGNED(R, R'length)));
end;
function "*"(L: UNSIGNED; R: SIGNED) return STD_LOGIC_VECTOR is
-- pragma label_applies_to mult
-- --synopsys subpgm_id 302
begin
return STD_LOGIC_VECTOR (
mult(-- pragma label mult
CONV_SIGNED(L, L'length+1), CONV_SIGNED(R, R'length)));
end;
function "*"(L: SIGNED; R: UNSIGNED) return STD_LOGIC_VECTOR is
-- pragma label_applies_to mult
-- --synopsys subpgm_id 303
begin
return STD_LOGIC_VECTOR (
mult(-- pragma label mult
CONV_SIGNED(L, L'length), CONV_SIGNED(R, R'length+1)));
end;
function "+"(L: UNSIGNED; R: UNSIGNED) return UNSIGNED is
-- pragma label_applies_to plus
-- --synopsys subpgm_id 236
constant length: INTEGER := max(L'length, R'length);
begin
return unsigned_plus(CONV_UNSIGNED(L, length),
CONV_UNSIGNED(R, length)); -- pragma label plus
end;
function "+"(L: SIGNED; R: SIGNED) return SIGNED is
-- pragma label_applies_to plus
-- --synopsys subpgm_id 237
constant length: INTEGER := max(L'length, R'length);
begin
return plus(CONV_SIGNED(L, length),
CONV_SIGNED(R, length)); -- pragma label plus
end;
function "+"(L: UNSIGNED; R: SIGNED) return SIGNED is
-- pragma label_applies_to plus
-- --synopsys subpgm_id 238
constant length: INTEGER := max(L'length + 1, R'length);
begin
return plus(CONV_SIGNED(L, length),
CONV_SIGNED(R, length)); -- pragma label plus
end;
function "+"(L: SIGNED; R: UNSIGNED) return SIGNED is
-- pragma label_applies_to plus
-- --synopsys subpgm_id 239
constant length: INTEGER := max(L'length, R'length + 1);
begin
return plus(CONV_SIGNED(L, length),
CONV_SIGNED(R, length)); -- pragma label plus
end;
function "+"(L: UNSIGNED; R: INTEGER) return UNSIGNED is
-- pragma label_applies_to plus
-- --synopsys subpgm_id 240
constant length: INTEGER := L'length + 1;
begin
return CONV_UNSIGNED(
plus( -- pragma label plus
CONV_SIGNED(L, length), CONV_SIGNED(R, length)), length-1);
end;
function "+"(L: INTEGER; R: UNSIGNED) return UNSIGNED is
-- pragma label_applies_to plus
-- --synopsys subpgm_id 241
constant length: INTEGER := R'length + 1;
begin
return CONV_UNSIGNED(
plus( -- pragma label plus
CONV_SIGNED(L, length), CONV_SIGNED(R, length)), length-1);
end;
function "+"(L: SIGNED; R: INTEGER) return SIGNED is
-- pragma label_applies_to plus
-- --synopsys subpgm_id 242
constant length: INTEGER := L'length;
begin
return plus(CONV_SIGNED(L, length),
CONV_SIGNED(R, length)); -- pragma label plus
end;
function "+"(L: INTEGER; R: SIGNED) return SIGNED is
-- pragma label_applies_to plus
-- --synopsys subpgm_id 243
constant length: INTEGER := R'length;
begin
return plus(CONV_SIGNED(L, length),
CONV_SIGNED(R, length)); -- pragma label plus
end;
function "+"(L: UNSIGNED; R: STD_ULOGIC) return UNSIGNED is
-- pragma label_applies_to plus
-- --synopsys subpgm_id 244
constant length: INTEGER := L'length;
begin
return unsigned_plus(CONV_UNSIGNED(L, length),
CONV_UNSIGNED(R, length)) ; -- pragma label plus
end;
function "+"(L: STD_ULOGIC; R: UNSIGNED) return UNSIGNED is
-- pragma label_applies_to plus
-- --synopsys subpgm_id 245
constant length: INTEGER := R'length;
begin
return unsigned_plus(CONV_UNSIGNED(L, length),
CONV_UNSIGNED(R, length)); -- pragma label plus
end;
function "+"(L: SIGNED; R: STD_ULOGIC) return SIGNED is
-- pragma label_applies_to plus
-- --synopsys subpgm_id 246
constant length: INTEGER := L'length;
begin
return plus(CONV_SIGNED(L, length),
CONV_SIGNED(R, length)); -- pragma label plus
end;
function "+"(L: STD_ULOGIC; R: SIGNED) return SIGNED is
-- pragma label_applies_to plus
-- --synopsys subpgm_id 247
constant length: INTEGER := R'length;
begin
return plus(CONV_SIGNED(L, length),
CONV_SIGNED(R, length)); -- pragma label plus
end;
function "+"(L: UNSIGNED; R: UNSIGNED) return STD_LOGIC_VECTOR is
-- pragma label_applies_to plus
-- --synopsys subpgm_id 260
constant length: INTEGER := max(L'length, R'length);
begin
return STD_LOGIC_VECTOR (
unsigned_plus(-- pragma label plus
CONV_UNSIGNED(L, length), CONV_UNSIGNED(R, length)));
end;
function "+"(L: SIGNED; R: SIGNED) return STD_LOGIC_VECTOR is
-- pragma label_applies_to plus
-- --synopsys subpgm_id 261
constant length: INTEGER := max(L'length, R'length);
begin
return STD_LOGIC_VECTOR (
plus(-- pragma label plus
CONV_SIGNED(L, length), CONV_SIGNED(R, length)));
end;
function "+"(L: UNSIGNED; R: SIGNED) return STD_LOGIC_VECTOR is
-- pragma label_applies_to plus
-- --synopsys subpgm_id 262
constant length: INTEGER := max(L'length + 1, R'length);
begin
return STD_LOGIC_VECTOR (
plus(-- pragma label plus
CONV_SIGNED(L, length), CONV_SIGNED(R, length)));
end;
function "+"(L: SIGNED; R: UNSIGNED) return STD_LOGIC_VECTOR is
-- pragma label_applies_to plus
-- --synopsys subpgm_id 263
constant length: INTEGER := max(L'length, R'length + 1);
begin
return STD_LOGIC_VECTOR (
plus(-- pragma label plus
CONV_SIGNED(L, length), CONV_SIGNED(R, length)));
end;
function "+"(L: UNSIGNED; R: INTEGER) return STD_LOGIC_VECTOR is
-- pragma label_applies_to plus
-- --synopsys subpgm_id 264
constant length: INTEGER := L'length + 1;
begin
return STD_LOGIC_VECTOR (CONV_UNSIGNED(
plus( -- pragma label plus
CONV_SIGNED(L, length), CONV_SIGNED(R, length)), length-1));
end;
function "+"(L: INTEGER; R: UNSIGNED) return STD_LOGIC_VECTOR is
-- pragma label_applies_to plus
-- --synopsys subpgm_id 265
constant length: INTEGER := R'length + 1;
begin
return STD_LOGIC_VECTOR (CONV_UNSIGNED(
plus( -- pragma label plus
CONV_SIGNED(L, length), CONV_SIGNED(R, length)), length-1));
end;
function "+"(L: SIGNED; R: INTEGER) return STD_LOGIC_VECTOR is
-- pragma label_applies_to plus
-- --synopsys subpgm_id 266
constant length: INTEGER := L'length;
begin
return STD_LOGIC_VECTOR (
plus(-- pragma label plus
CONV_SIGNED(L, length), CONV_SIGNED(R, length)));
end;
function "+"(L: INTEGER; R: SIGNED) return STD_LOGIC_VECTOR is
-- pragma label_applies_to plus
-- --synopsys subpgm_id 267
constant length: INTEGER := R'length;
begin
return STD_LOGIC_VECTOR (
plus(-- pragma label plus
CONV_SIGNED(L, length), CONV_SIGNED(R, length)));
end;
function "+"(L: UNSIGNED; R: STD_ULOGIC) return STD_LOGIC_VECTOR is
-- pragma label_applies_to plus
-- --synopsys subpgm_id 268
constant length: INTEGER := L'length;
begin
return STD_LOGIC_VECTOR (
unsigned_plus(-- pragma label plus
CONV_UNSIGNED(L, length), CONV_UNSIGNED(R, length))) ;
end;
function "+"(L: STD_ULOGIC; R: UNSIGNED) return STD_LOGIC_VECTOR is
-- pragma label_applies_to plus
-- --synopsys subpgm_id 269
constant length: INTEGER := R'length;
begin
return STD_LOGIC_VECTOR (
unsigned_plus(-- pragma label plus
CONV_UNSIGNED(L, length), CONV_UNSIGNED(R, length)));
end;
function "+"(L: SIGNED; R: STD_ULOGIC) return STD_LOGIC_VECTOR is
-- pragma label_applies_to plus
-- --synopsys subpgm_id 270
constant length: INTEGER := L'length;
begin
return STD_LOGIC_VECTOR (
plus(-- pragma label plus
CONV_SIGNED(L, length), CONV_SIGNED(R, length)));
end;
function "+"(L: STD_ULOGIC; R: SIGNED) return STD_LOGIC_VECTOR is
-- pragma label_applies_to plus
-- --synopsys subpgm_id 271
constant length: INTEGER := R'length;
begin
return STD_LOGIC_VECTOR (
plus(-- pragma label plus
CONV_SIGNED(L, length), CONV_SIGNED(R, length)));
end;
function "-"(L: UNSIGNED; R: UNSIGNED) return UNSIGNED is
-- pragma label_applies_to minus
-- --synopsys subpgm_id 248
constant length: INTEGER := max(L'length, R'length);
begin
return unsigned_minus(CONV_UNSIGNED(L, length),
CONV_UNSIGNED(R, length)); -- pragma label minus
end;
function "-"(L: SIGNED; R: SIGNED) return SIGNED is
-- pragma label_applies_to minus
-- --synopsys subpgm_id 249
constant length: INTEGER := max(L'length, R'length);
begin
return minus(CONV_SIGNED(L, length),
CONV_SIGNED(R, length)); -- pragma label minus
end;
function "-"(L: UNSIGNED; R: SIGNED) return SIGNED is
-- pragma label_applies_to minus
-- --synopsys subpgm_id 250
constant length: INTEGER := max(L'length + 1, R'length);
begin
return minus(CONV_SIGNED(L, length),
CONV_SIGNED(R, length)); -- pragma label minus
end;
function "-"(L: SIGNED; R: UNSIGNED) return SIGNED is
-- pragma label_applies_to minus
-- --synopsys subpgm_id 251
constant length: INTEGER := max(L'length, R'length + 1);
begin
return minus(CONV_SIGNED(L, length),
CONV_SIGNED(R, length)); -- pragma label minus
end;
function "-"(L: UNSIGNED; R: INTEGER) return UNSIGNED is
-- pragma label_applies_to minus
-- --synopsys subpgm_id 252
constant length: INTEGER := L'length + 1;
begin
return CONV_UNSIGNED(
minus( -- pragma label minus
CONV_SIGNED(L, length), CONV_SIGNED(R, length)), length-1);
end;
function "-"(L: INTEGER; R: UNSIGNED) return UNSIGNED is
-- pragma label_applies_to minus
-- --synopsys subpgm_id 253
constant length: INTEGER := R'length + 1;
begin
return CONV_UNSIGNED(
minus( -- pragma label minus
CONV_SIGNED(L, length), CONV_SIGNED(R, length)), length-1);
end;
function "-"(L: SIGNED; R: INTEGER) return SIGNED is
-- pragma label_applies_to minus
-- --synopsys subpgm_id 254
constant length: INTEGER := L'length;
begin
return minus(CONV_SIGNED(L, length),
CONV_SIGNED(R, length)); -- pragma label minus
end;
function "-"(L: INTEGER; R: SIGNED) return SIGNED is
-- pragma label_applies_to minus
-- --synopsys subpgm_id 255
constant length: INTEGER := R'length;
begin
return minus(CONV_SIGNED(L, length),
CONV_SIGNED(R, length)); -- pragma label minus
end;
function "-"(L: UNSIGNED; R: STD_ULOGIC) return UNSIGNED is
-- pragma label_applies_to minus
-- --synopsys subpgm_id 256
constant length: INTEGER := L'length + 1;
begin
return CONV_UNSIGNED(
minus( -- pragma label minus
CONV_SIGNED(L, length), CONV_SIGNED(R, length)), length-1);
end;
function "-"(L: STD_ULOGIC; R: UNSIGNED) return UNSIGNED is
-- pragma label_applies_to minus
-- --synopsys subpgm_id 257
constant length: INTEGER := R'length + 1;
begin
return CONV_UNSIGNED(
minus( -- pragma label minus
CONV_SIGNED(L, length), CONV_SIGNED(R, length)), length-1);
end;
function "-"(L: SIGNED; R: STD_ULOGIC) return SIGNED is
-- pragma label_applies_to minus
-- --synopsys subpgm_id 258
constant length: INTEGER := L'length;
begin
return minus(CONV_SIGNED(L, length),
CONV_SIGNED(R, length)); -- pragma label minus
end;
function "-"(L: STD_ULOGIC; R: SIGNED) return SIGNED is
-- pragma label_applies_to minus
-- --synopsys subpgm_id 259
constant length: INTEGER := R'length;
begin
return minus(CONV_SIGNED(L, length),
CONV_SIGNED(R, length)); -- pragma label minus
end;
function "-"(L: UNSIGNED; R: UNSIGNED) return STD_LOGIC_VECTOR is
-- pragma label_applies_to minus
-- --synopsys subpgm_id 272
constant length: INTEGER := max(L'length, R'length);
begin
return STD_LOGIC_VECTOR (
unsigned_minus(-- pragma label minus
CONV_UNSIGNED(L, length), CONV_UNSIGNED(R, length)));
end;
function "-"(L: SIGNED; R: SIGNED) return STD_LOGIC_VECTOR is
-- pragma label_applies_to minus
-- --synopsys subpgm_id 273
constant length: INTEGER := max(L'length, R'length);
begin
return STD_LOGIC_VECTOR (
minus(-- pragma label minus
CONV_SIGNED(L, length), CONV_SIGNED(R, length)));
end;
function "-"(L: UNSIGNED; R: SIGNED) return STD_LOGIC_VECTOR is
-- pragma label_applies_to minus
-- --synopsys subpgm_id 274
constant length: INTEGER := max(L'length + 1, R'length);
begin
return STD_LOGIC_VECTOR (
minus(-- pragma label minus
CONV_SIGNED(L, length), CONV_SIGNED(R, length)));
end;
function "-"(L: SIGNED; R: UNSIGNED) return STD_LOGIC_VECTOR is
-- pragma label_applies_to minus
-- --synopsys subpgm_id 275
constant length: INTEGER := max(L'length, R'length + 1);
begin
return STD_LOGIC_VECTOR (
minus(-- pragma label minus
CONV_SIGNED(L, length), CONV_SIGNED(R, length)));
end;
function "-"(L: UNSIGNED; R: INTEGER) return STD_LOGIC_VECTOR is
-- pragma label_applies_to minus
-- --synopsys subpgm_id 276
constant length: INTEGER := L'length + 1;
begin
return STD_LOGIC_VECTOR (CONV_UNSIGNED(
minus( -- pragma label minus
CONV_SIGNED(L, length), CONV_SIGNED(R, length)), length-1));
end;
function "-"(L: INTEGER; R: UNSIGNED) return STD_LOGIC_VECTOR is
-- pragma label_applies_to minus
-- --synopsys subpgm_id 277
constant length: INTEGER := R'length + 1;
begin
return STD_LOGIC_VECTOR (CONV_UNSIGNED(
minus( -- pragma label minus
CONV_SIGNED(L, length), CONV_SIGNED(R, length)), length-1));
end;
function "-"(L: SIGNED; R: INTEGER) return STD_LOGIC_VECTOR is
-- pragma label_applies_to minus
-- --synopsys subpgm_id 278
constant length: INTEGER := L'length;
begin
return STD_LOGIC_VECTOR (
minus(-- pragma label minus
CONV_SIGNED(L, length), CONV_SIGNED(R, length)));
end;
function "-"(L: INTEGER; R: SIGNED) return STD_LOGIC_VECTOR is
-- pragma label_applies_to minus
-- --synopsys subpgm_id 279
constant length: INTEGER := R'length;
begin
return STD_LOGIC_VECTOR (
minus(-- pragma label minus
CONV_SIGNED(L, length), CONV_SIGNED(R, length)));
end;
function "-"(L: UNSIGNED; R: STD_ULOGIC) return STD_LOGIC_VECTOR is
-- pragma label_applies_to minus
-- --synopsys subpgm_id 280
constant length: INTEGER := L'length + 1;
begin
return STD_LOGIC_VECTOR (CONV_UNSIGNED(
minus( -- pragma label minus
CONV_SIGNED(L, length), CONV_SIGNED(R, length)), length-1));
end;
function "-"(L: STD_ULOGIC; R: UNSIGNED) return STD_LOGIC_VECTOR is
-- pragma label_applies_to minus
-- --synopsys subpgm_id 281
constant length: INTEGER := R'length + 1;
begin
return STD_LOGIC_VECTOR (CONV_UNSIGNED(
minus( -- pragma label minus
CONV_SIGNED(L, length), CONV_SIGNED(R, length)), length-1));
end;
function "-"(L: SIGNED; R: STD_ULOGIC) return STD_LOGIC_VECTOR is
-- pragma label_applies_to minus
-- --synopsys subpgm_id 282
constant length: INTEGER := L'length;
begin
return STD_LOGIC_VECTOR (
minus(-- pragma label minus
CONV_SIGNED(L, length), CONV_SIGNED(R, length)));
end;
function "-"(L: STD_ULOGIC; R: SIGNED) return STD_LOGIC_VECTOR is
-- pragma label_applies_to minus
-- --synopsys subpgm_id 283
constant length: INTEGER := R'length;
begin
return STD_LOGIC_VECTOR (
minus(-- pragma label minus
CONV_SIGNED(L, length), CONV_SIGNED(R, length)));
end;
function "+"(L: UNSIGNED) return UNSIGNED is
-- --synopsys subpgm_id 284
begin
return L;
end;
function "+"(L: SIGNED) return SIGNED is
-- --synopsys subpgm_id 285
begin
return L;
end;
function "-"(L: SIGNED) return SIGNED is
-- pragma label_applies_to minus
-- --synopsys subpgm_id 286
begin
return 0 - L; -- pragma label minus
end;
function "ABS"(L: SIGNED) return SIGNED is
-- --synopsys subpgm_id 287
begin
if (L(L'left) = '0' or L(L'left) = 'L') then
return L;
else
return 0 - L;
end if;
end;
function "+"(L: UNSIGNED) return STD_LOGIC_VECTOR is
-- --synopsys subpgm_id 289
begin
return STD_LOGIC_VECTOR (L);
end;
function "+"(L: SIGNED) return STD_LOGIC_VECTOR is
-- --synopsys subpgm_id 290
begin
return STD_LOGIC_VECTOR (L);
end;
function "-"(L: SIGNED) return STD_LOGIC_VECTOR is
-- pragma label_applies_to minus
-- --synopsys subpgm_id 292
variable tmp: SIGNED(L'length-1 downto 0);
begin
tmp := 0 - L; -- pragma label minus
return STD_LOGIC_VECTOR (tmp);
end;
function "ABS"(L: SIGNED) return STD_LOGIC_VECTOR is
-- --synopsys subpgm_id 294
variable tmp: SIGNED(L'length-1 downto 0);
begin
if (L(L'left) = '0' or L(L'left) = 'L') then
return STD_LOGIC_VECTOR (L);
else
tmp := 0 - L;
return STD_LOGIC_VECTOR (tmp);
end if;
end;
-- Type propagation function which returns the type BOOLEAN
function UNSIGNED_RETURN_BOOLEAN(A,B: UNSIGNED) return BOOLEAN is
variable Z: BOOLEAN;
-- pragma return_port_name Z
begin
return(Z);
end;
-- Type propagation function which returns the type BOOLEAN
function SIGNED_RETURN_BOOLEAN(A,B: SIGNED) return BOOLEAN is
variable Z: BOOLEAN;
-- pragma return_port_name Z
begin
return(Z);
end;
-- compare two signed numbers of the same length
-- both arrays must have range (msb downto 0)
function is_less(A, B: SIGNED) return BOOLEAN is
constant sign: INTEGER := A'left;
variable a_is_0, b_is_1, result : boolean;
-- pragma map_to_operator LT_TC_OP
-- pragma type_function SIGNED_RETURN_BOOLEAN
-- pragma return_port_name Z
begin
if A(sign) /= B(sign) then
result := A(sign) = '1';
else
result := FALSE;
for i in 0 to sign-1 loop
a_is_0 := A(i) = '0';
b_is_1 := B(i) = '1';
result := (a_is_0 and b_is_1) or
(a_is_0 and result) or
(b_is_1 and result);
end loop;
end if;
return result;
end;
-- compare two signed numbers of the same length
-- both arrays must have range (msb downto 0)
function is_less_or_equal(A, B: SIGNED) return BOOLEAN is
constant sign: INTEGER := A'left;
variable a_is_0, b_is_1, result : boolean;
-- pragma map_to_operator LEQ_TC_OP
-- pragma type_function SIGNED_RETURN_BOOLEAN
-- pragma return_port_name Z
begin
if A(sign) /= B(sign) then
result := A(sign) = '1';
else
result := TRUE;
for i in 0 to sign-1 loop
a_is_0 := A(i) = '0';
b_is_1 := B(i) = '1';
result := (a_is_0 and b_is_1) or
(a_is_0 and result) or
(b_is_1 and result);
end loop;
end if;
return result;
end;
-- compare two unsigned numbers of the same length
-- both arrays must have range (msb downto 0)
function unsigned_is_less(A, B: UNSIGNED) return BOOLEAN is
constant sign: INTEGER := A'left;
variable a_is_0, b_is_1, result : boolean;
-- pragma map_to_operator LT_UNS_OP
-- pragma type_function UNSIGNED_RETURN_BOOLEAN
-- pragma return_port_name Z
begin
result := FALSE;
for i in 0 to sign loop
a_is_0 := A(i) = '0';
b_is_1 := B(i) = '1';
result := (a_is_0 and b_is_1) or
(a_is_0 and result) or
(b_is_1 and result);
end loop;
return result;
end;
-- compare two unsigned numbers of the same length
-- both arrays must have range (msb downto 0)
function unsigned_is_less_or_equal(A, B: UNSIGNED) return BOOLEAN is
constant sign: INTEGER := A'left;
variable a_is_0, b_is_1, result : boolean;
-- pragma map_to_operator LEQ_UNS_OP
-- pragma type_function UNSIGNED_RETURN_BOOLEAN
-- pragma return_port_name Z
begin
result := TRUE;
for i in 0 to sign loop
a_is_0 := A(i) = '0';
b_is_1 := B(i) = '1';
result := (a_is_0 and b_is_1) or
(a_is_0 and result) or
(b_is_1 and result);
end loop;
return result;
end;
function "<"(L: UNSIGNED; R: UNSIGNED) return BOOLEAN is
-- pragma label_applies_to lt
-- --synopsys subpgm_id 305
constant length: INTEGER := max(L'length, R'length);
begin
return unsigned_is_less(CONV_UNSIGNED(L, length),
CONV_UNSIGNED(R, length)); -- pragma label lt
end;
function "<"(L: SIGNED; R: SIGNED) return BOOLEAN is
-- pragma label_applies_to lt
-- --synopsys subpgm_id 306
constant length: INTEGER := max(L'length, R'length);
begin
return is_less(CONV_SIGNED(L, length),
CONV_SIGNED(R, length)); -- pragma label lt
end;
function "<"(L: UNSIGNED; R: SIGNED) return BOOLEAN is
-- pragma label_applies_to lt
-- --synopsys subpgm_id 307
constant length: INTEGER := max(L'length + 1, R'length);
begin
return is_less(CONV_SIGNED(L, length),
CONV_SIGNED(R, length)); -- pragma label lt
end;
function "<"(L: SIGNED; R: UNSIGNED) return BOOLEAN is
-- pragma label_applies_to lt
-- --synopsys subpgm_id 308
constant length: INTEGER := max(L'length, R'length + 1);
begin
return is_less(CONV_SIGNED(L, length),
CONV_SIGNED(R, length)); -- pragma label lt
end;
function "<"(L: UNSIGNED; R: INTEGER) return BOOLEAN is
-- pragma label_applies_to lt
-- --synopsys subpgm_id 309
constant length: INTEGER := L'length + 1;
begin
return is_less(CONV_SIGNED(L, length),
CONV_SIGNED(R, length)); -- pragma label lt
end;
function "<"(L: INTEGER; R: UNSIGNED) return BOOLEAN is
-- pragma label_applies_to lt
-- --synopsys subpgm_id 310
constant length: INTEGER := R'length + 1;
begin
return is_less(CONV_SIGNED(L, length),
CONV_SIGNED(R, length)); -- pragma label lt
end;
function "<"(L: SIGNED; R: INTEGER) return BOOLEAN is
-- pragma label_applies_to lt
-- --synopsys subpgm_id 311
constant length: INTEGER := L'length;
begin
return is_less(CONV_SIGNED(L, length),
CONV_SIGNED(R, length)); -- pragma label lt
end;
function "<"(L: INTEGER; R: SIGNED) return BOOLEAN is
-- pragma label_applies_to lt
-- --synopsys subpgm_id 312
constant length: INTEGER := R'length;
begin
return is_less(CONV_SIGNED(L, length),
CONV_SIGNED(R, length)); -- pragma label lt
end;
function "<="(L: UNSIGNED; R: UNSIGNED) return BOOLEAN is
-- pragma label_applies_to leq
-- --synopsys subpgm_id 314
constant length: INTEGER := max(L'length, R'length);
begin
return unsigned_is_less_or_equal(CONV_UNSIGNED(L, length),
CONV_UNSIGNED(R, length)); -- pragma label leq
end;
function "<="(L: SIGNED; R: SIGNED) return BOOLEAN is
-- pragma label_applies_to leq
-- --synopsys subpgm_id 315
constant length: INTEGER := max(L'length, R'length);
begin
return is_less_or_equal(CONV_SIGNED(L, length),
CONV_SIGNED(R, length)); -- pragma label leq
end;
function "<="(L: UNSIGNED; R: SIGNED) return BOOLEAN is
-- pragma label_applies_to leq
-- --synopsys subpgm_id 316
constant length: INTEGER := max(L'length + 1, R'length);
begin
return is_less_or_equal(CONV_SIGNED(L, length),
CONV_SIGNED(R, length)); -- pragma label leq
end;
function "<="(L: SIGNED; R: UNSIGNED) return BOOLEAN is
-- pragma label_applies_to leq
-- --synopsys subpgm_id 317
constant length: INTEGER := max(L'length, R'length + 1);
begin
return is_less_or_equal(CONV_SIGNED(L, length),
CONV_SIGNED(R, length)); -- pragma label leq
end;
function "<="(L: UNSIGNED; R: INTEGER) return BOOLEAN is
-- pragma label_applies_to leq
-- --synopsys subpgm_id 318
constant length: INTEGER := L'length + 1;
begin
return is_less_or_equal(CONV_SIGNED(L, length),
CONV_SIGNED(R, length)); -- pragma label leq
end;
function "<="(L: INTEGER; R: UNSIGNED) return BOOLEAN is
-- pragma label_applies_to leq
-- --synopsys subpgm_id 319
constant length: INTEGER := R'length + 1;
begin
return is_less_or_equal(CONV_SIGNED(L, length),
CONV_SIGNED(R, length)); -- pragma label leq
end;
function "<="(L: SIGNED; R: INTEGER) return BOOLEAN is
-- pragma label_applies_to leq
-- --synopsys subpgm_id 320
constant length: INTEGER := L'length;
begin
return is_less_or_equal(CONV_SIGNED(L, length),
CONV_SIGNED(R, length)); -- pragma label leq
end;
function "<="(L: INTEGER; R: SIGNED) return BOOLEAN is
-- pragma label_applies_to leq
-- --synopsys subpgm_id 321
constant length: INTEGER := R'length;
begin
return is_less_or_equal(CONV_SIGNED(L, length),
CONV_SIGNED(R, length)); -- pragma label leq
end;
function ">"(L: UNSIGNED; R: UNSIGNED) return BOOLEAN is
-- pragma label_applies_to gt
-- --synopsys subpgm_id 323
constant length: INTEGER := max(L'length, R'length);
begin
return unsigned_is_less(CONV_UNSIGNED(R, length),
CONV_UNSIGNED(L, length)); -- pragma label gt
end;
function ">"(L: SIGNED; R: SIGNED) return BOOLEAN is
-- pragma label_applies_to gt
-- --synopsys subpgm_id 324
constant length: INTEGER := max(L'length, R'length);
begin
return is_less(CONV_SIGNED(R, length),
CONV_SIGNED(L, length)); -- pragma label gt
end;
function ">"(L: UNSIGNED; R: SIGNED) return BOOLEAN is
-- pragma label_applies_to gt
-- --synopsys subpgm_id 325
constant length: INTEGER := max(L'length + 1, R'length);
begin
return is_less(CONV_SIGNED(R, length),
CONV_SIGNED(L, length)); -- pragma label gt
end;
function ">"(L: SIGNED; R: UNSIGNED) return BOOLEAN is
-- pragma label_applies_to gt
-- --synopsys subpgm_id 326
constant length: INTEGER := max(L'length, R'length + 1);
begin
return is_less(CONV_SIGNED(R, length),
CONV_SIGNED(L, length)); -- pragma label gt
end;
function ">"(L: UNSIGNED; R: INTEGER) return BOOLEAN is
-- pragma label_applies_to gt
-- --synopsys subpgm_id 327
constant length: INTEGER := L'length + 1;
begin
return is_less(CONV_SIGNED(R, length),
CONV_SIGNED(L, length)); -- pragma label gt
end;
function ">"(L: INTEGER; R: UNSIGNED) return BOOLEAN is
-- pragma label_applies_to gt
-- --synopsys subpgm_id 328
constant length: INTEGER := R'length + 1;
begin
return is_less(CONV_SIGNED(R, length),
CONV_SIGNED(L, length)); -- pragma label gt
end;
function ">"(L: SIGNED; R: INTEGER) return BOOLEAN is
-- pragma label_applies_to gt
-- --synopsys subpgm_id 329
constant length: INTEGER := L'length;
begin
return is_less(CONV_SIGNED(R, length),
CONV_SIGNED(L, length)); -- pragma label gt
end;
function ">"(L: INTEGER; R: SIGNED) return BOOLEAN is
-- pragma label_applies_to gt
-- --synopsys subpgm_id 330
constant length: INTEGER := R'length;
begin
return is_less(CONV_SIGNED(R, length),
CONV_SIGNED(L, length)); -- pragma label gt
end;
function ">="(L: UNSIGNED; R: UNSIGNED) return BOOLEAN is
-- pragma label_applies_to geq
-- --synopsys subpgm_id 332
constant length: INTEGER := max(L'length, R'length);
begin
return unsigned_is_less_or_equal(CONV_UNSIGNED(R, length),
CONV_UNSIGNED(L, length)); -- pragma label geq
end;
function ">="(L: SIGNED; R: SIGNED) return BOOLEAN is
-- pragma label_applies_to geq
-- --synopsys subpgm_id 333
constant length: INTEGER := max(L'length, R'length);
begin
return is_less_or_equal(CONV_SIGNED(R, length),
CONV_SIGNED(L, length)); -- pragma label geq
end;
function ">="(L: UNSIGNED; R: SIGNED) return BOOLEAN is
-- pragma label_applies_to geq
-- --synopsys subpgm_id 334
constant length: INTEGER := max(L'length + 1, R'length);
begin
return is_less_or_equal(CONV_SIGNED(R, length),
CONV_SIGNED(L, length)); -- pragma label geq
end;
function ">="(L: SIGNED; R: UNSIGNED) return BOOLEAN is
-- pragma label_applies_to geq
-- --synopsys subpgm_id 335
constant length: INTEGER := max(L'length, R'length + 1);
begin
return is_less_or_equal(CONV_SIGNED(R, length),
CONV_SIGNED(L, length)); -- pragma label geq
end;
function ">="(L: UNSIGNED; R: INTEGER) return BOOLEAN is
-- pragma label_applies_to geq
-- --synopsys subpgm_id 336
constant length: INTEGER := L'length + 1;
begin
return is_less_or_equal(CONV_SIGNED(R, length),
CONV_SIGNED(L, length)); -- pragma label geq
end;
function ">="(L: INTEGER; R: UNSIGNED) return BOOLEAN is
-- pragma label_applies_to geq
-- --synopsys subpgm_id 337
constant length: INTEGER := R'length + 1;
begin
return is_less_or_equal(CONV_SIGNED(R, length),
CONV_SIGNED(L, length)); -- pragma label geq
end;
function ">="(L: SIGNED; R: INTEGER) return BOOLEAN is
-- pragma label_applies_to geq
-- --synopsys subpgm_id 338
constant length: INTEGER := L'length;
begin
return is_less_or_equal(CONV_SIGNED(R, length),
CONV_SIGNED(L, length)); -- pragma label geq
end;
function ">="(L: INTEGER; R: SIGNED) return BOOLEAN is
-- pragma label_applies_to geq
-- --synopsys subpgm_id 339
constant length: INTEGER := R'length;
begin
return is_less_or_equal(CONV_SIGNED(R, length),
CONV_SIGNED(L, length)); -- pragma label geq
end;
-- for internal use only. Assumes SIGNED arguments of equal length.
function bitwise_eql(L: STD_ULOGIC_VECTOR; R: STD_ULOGIC_VECTOR)
return BOOLEAN is
-- pragma built_in SYN_EQL
begin
for i in L'range loop
if L(i) /= R(i) then
return FALSE;
end if;
end loop;
return TRUE;
end;
-- for internal use only. Assumes SIGNED arguments of equal length.
function bitwise_neq(L: STD_ULOGIC_VECTOR; R: STD_ULOGIC_VECTOR)
return BOOLEAN is
-- pragma built_in SYN_NEQ
begin
for i in L'range loop
if L(i) /= R(i) then
return TRUE;
end if;
end loop;
return FALSE;
end;
function "="(L: UNSIGNED; R: UNSIGNED) return BOOLEAN is
-- --synopsys subpgm_id 341
constant length: INTEGER := max(L'length, R'length);
begin
return bitwise_eql( STD_ULOGIC_VECTOR( CONV_UNSIGNED(L, length) ),
STD_ULOGIC_VECTOR( CONV_UNSIGNED(R, length) ) );
end;
function "="(L: SIGNED; R: SIGNED) return BOOLEAN is
-- --synopsys subpgm_id 342
constant length: INTEGER := max(L'length, R'length);
begin
return bitwise_eql( STD_ULOGIC_VECTOR( CONV_SIGNED(L, length) ),
STD_ULOGIC_VECTOR( CONV_SIGNED(R, length) ) );
end;
function "="(L: UNSIGNED; R: SIGNED) return BOOLEAN is
-- --synopsys subpgm_id 343
constant length: INTEGER := max(L'length + 1, R'length);
begin
return bitwise_eql( STD_ULOGIC_VECTOR( CONV_SIGNED(L, length) ),
STD_ULOGIC_VECTOR( CONV_SIGNED(R, length) ) );
end;
function "="(L: SIGNED; R: UNSIGNED) return BOOLEAN is
-- --synopsys subpgm_id 344
constant length: INTEGER := max(L'length, R'length + 1);
begin
return bitwise_eql( STD_ULOGIC_VECTOR( CONV_SIGNED(L, length) ),
STD_ULOGIC_VECTOR( CONV_SIGNED(R, length) ) );
end;
function "="(L: UNSIGNED; R: INTEGER) return BOOLEAN is
-- --synopsys subpgm_id 345
constant length: INTEGER := L'length + 1;
begin
return bitwise_eql( STD_ULOGIC_VECTOR( CONV_SIGNED(L, length) ),
STD_ULOGIC_VECTOR( CONV_SIGNED(R, length) ) );
end;
function "="(L: INTEGER; R: UNSIGNED) return BOOLEAN is
-- --synopsys subpgm_id 346
constant length: INTEGER := R'length + 1;
begin
return bitwise_eql( STD_ULOGIC_VECTOR( CONV_SIGNED(L, length) ),
STD_ULOGIC_VECTOR( CONV_SIGNED(R, length) ) );
end;
function "="(L: SIGNED; R: INTEGER) return BOOLEAN is
-- --synopsys subpgm_id 347
constant length: INTEGER := L'length;
begin
return bitwise_eql( STD_ULOGIC_VECTOR( CONV_SIGNED(L, length) ),
STD_ULOGIC_VECTOR( CONV_SIGNED(R, length) ) );
end;
function "="(L: INTEGER; R: SIGNED) return BOOLEAN is
-- --synopsys subpgm_id 348
constant length: INTEGER := R'length;
begin
return bitwise_eql( STD_ULOGIC_VECTOR( CONV_SIGNED(L, length) ),
STD_ULOGIC_VECTOR( CONV_SIGNED(R, length) ) );
end;
function "/="(L: UNSIGNED; R: UNSIGNED) return BOOLEAN is
-- --synopsys subpgm_id 350
constant length: INTEGER := max(L'length, R'length);
begin
return bitwise_neq( STD_ULOGIC_VECTOR( CONV_UNSIGNED(L, length) ),
STD_ULOGIC_VECTOR( CONV_UNSIGNED(R, length) ) );
end;
function "/="(L: SIGNED; R: SIGNED) return BOOLEAN is
-- --synopsys subpgm_id 351
constant length: INTEGER := max(L'length, R'length);
begin
return bitwise_neq( STD_ULOGIC_VECTOR( CONV_SIGNED(L, length) ),
STD_ULOGIC_VECTOR( CONV_SIGNED(R, length) ) );
end;
function "/="(L: UNSIGNED; R: SIGNED) return BOOLEAN is
-- --synopsys subpgm_id 352
constant length: INTEGER := max(L'length + 1, R'length);
begin
return bitwise_neq( STD_ULOGIC_VECTOR( CONV_SIGNED(L, length) ),
STD_ULOGIC_VECTOR( CONV_SIGNED(R, length) ) );
end;
function "/="(L: SIGNED; R: UNSIGNED) return BOOLEAN is
-- --synopsys subpgm_id 353
constant length: INTEGER := max(L'length, R'length + 1);
begin
return bitwise_neq( STD_ULOGIC_VECTOR( CONV_SIGNED(L, length) ),
STD_ULOGIC_VECTOR( CONV_SIGNED(R, length) ) );
end;
function "/="(L: UNSIGNED; R: INTEGER) return BOOLEAN is
-- --synopsys subpgm_id 354
constant length: INTEGER := L'length + 1;
begin
return bitwise_neq( STD_ULOGIC_VECTOR( CONV_SIGNED(L, length) ),
STD_ULOGIC_VECTOR( CONV_SIGNED(R, length) ) );
end;
function "/="(L: INTEGER; R: UNSIGNED) return BOOLEAN is
-- --synopsys subpgm_id 355
constant length: INTEGER := R'length + 1;
begin
return bitwise_neq( STD_ULOGIC_VECTOR( CONV_SIGNED(L, length) ),
STD_ULOGIC_VECTOR( CONV_SIGNED(R, length) ) );
end;
function "/="(L: SIGNED; R: INTEGER) return BOOLEAN is
-- --synopsys subpgm_id 356
constant length: INTEGER := L'length;
begin
return bitwise_neq( STD_ULOGIC_VECTOR( CONV_SIGNED(L, length) ),
STD_ULOGIC_VECTOR( CONV_SIGNED(R, length) ) );
end;
function "/="(L: INTEGER; R: SIGNED) return BOOLEAN is
-- --synopsys subpgm_id 357
constant length: INTEGER := R'length;
begin
return bitwise_neq( STD_ULOGIC_VECTOR( CONV_SIGNED(L, length) ),
STD_ULOGIC_VECTOR( CONV_SIGNED(R, length) ) );
end;
function SHL(ARG: UNSIGNED; COUNT: UNSIGNED) return UNSIGNED is
-- --synopsys subpgm_id 358
constant control_msb: INTEGER := COUNT'length - 1;
variable control: UNSIGNED (control_msb downto 0);
constant result_msb: INTEGER := ARG'length-1;
subtype rtype is UNSIGNED (result_msb downto 0);
variable result, temp: rtype;
begin
control := MAKE_BINARY(COUNT);
-- --synopsys synthesis_off
if (control(0) = 'X') then
result := rtype'(others => 'X');
return result;
end if;
-- --synopsys synthesis_on
result := ARG;
for i in 0 to control_msb loop
if control(i) = '1' then
temp := rtype'(others => '0');
if 2**i <= result_msb then
temp(result_msb downto 2**i) :=
result(result_msb - 2**i downto 0);
end if;
result := temp;
end if;
end loop;
return result;
end;
function SHL(ARG: SIGNED; COUNT: UNSIGNED) return SIGNED is
-- --synopsys subpgm_id 359
constant control_msb: INTEGER := COUNT'length - 1;
variable control: UNSIGNED (control_msb downto 0);
constant result_msb: INTEGER := ARG'length-1;
subtype rtype is SIGNED (result_msb downto 0);
variable result, temp: rtype;
begin
control := MAKE_BINARY(COUNT);
-- --synopsys synthesis_off
if (control(0) = 'X') then
result := rtype'(others => 'X');
return result;
end if;
-- --synopsys synthesis_on
result := ARG;
for i in 0 to control_msb loop
if control(i) = '1' then
temp := rtype'(others => '0');
if 2**i <= result_msb then
temp(result_msb downto 2**i) :=
result(result_msb - 2**i downto 0);
end if;
result := temp;
end if;
end loop;
return result;
end;
function SHR(ARG: UNSIGNED; COUNT: UNSIGNED) return UNSIGNED is
-- --synopsys subpgm_id 360
constant control_msb: INTEGER := COUNT'length - 1;
variable control: UNSIGNED (control_msb downto 0);
constant result_msb: INTEGER := ARG'length-1;
subtype rtype is UNSIGNED (result_msb downto 0);
variable result, temp: rtype;
begin
control := MAKE_BINARY(COUNT);
-- --synopsys synthesis_off
if (control(0) = 'X') then
result := rtype'(others => 'X');
return result;
end if;
-- --synopsys synthesis_on
result := ARG;
for i in 0 to control_msb loop
if control(i) = '1' then
temp := rtype'(others => '0');
if 2**i <= result_msb then
temp(result_msb - 2**i downto 0) :=
result(result_msb downto 2**i);
end if;
result := temp;
end if;
end loop;
return result;
end;
function SHR(ARG: SIGNED; COUNT: UNSIGNED) return SIGNED is
-- --synopsys subpgm_id 361
constant control_msb: INTEGER := COUNT'length - 1;
variable control: UNSIGNED (control_msb downto 0);
constant result_msb: INTEGER := ARG'length-1;
subtype rtype is SIGNED (result_msb downto 0);
variable result, temp: rtype;
variable sign_bit: STD_ULOGIC;
begin
control := MAKE_BINARY(COUNT);
-- --synopsys synthesis_off
if (control(0) = 'X') then
result := rtype'(others => 'X');
return result;
end if;
-- --synopsys synthesis_on
result := ARG;
sign_bit := ARG(ARG'left);
for i in 0 to control_msb loop
if control(i) = '1' then
temp := rtype'(others => sign_bit);
if 2**i <= result_msb then
temp(result_msb - 2**i downto 0) :=
result(result_msb downto 2**i);
end if;
result := temp;
end if;
end loop;
return result;
end;
function CONV_INTEGER(ARG: INTEGER) return INTEGER is
-- --synopsys subpgm_id 365
begin
return ARG;
end;
function CONV_INTEGER(ARG: UNSIGNED) return INTEGER is
variable result: INTEGER;
variable tmp: STD_ULOGIC;
-- --synopsys built_in SYN_UNSIGNED_TO_INTEGER
-- --synopsys subpgm_id 366
begin
-- --synopsys synthesis_off
assert ARG'length <= 31
report "ARG is too large in CONV_INTEGER"
severity FAILURE;
result := 0;
for i in ARG'range loop
result := result * 2;
tmp := tbl_BINARY(ARG(i));
if tmp = '1' then
result := result + 1;
elsif tmp = 'X' then
assert false
report "CONV_INTEGER: There is an 'U'|'X'|'W'|'Z'|'-' in an arithmetic operand, and it has been converted to 0."
severity WARNING;
end if;
end loop;
return result;
-- --synopsys synthesis_on
end;
function CONV_INTEGER(ARG: SIGNED) return INTEGER is
variable result: INTEGER;
variable tmp: STD_ULOGIC;
-- --synopsys built_in SYN_SIGNED_TO_INTEGER
-- --synopsys subpgm_id 367
begin
-- --synopsys synthesis_off
assert ARG'length <= 32
report "ARG is too large in CONV_INTEGER"
severity FAILURE;
result := 0;
for i in ARG'range loop
if i /= ARG'left then
result := result * 2;
tmp := tbl_BINARY(ARG(i));
if tmp = '1' then
result := result + 1;
elsif tmp = 'X' then
assert false
report "CONV_INTEGER: There is an 'U'|'X'|'W'|'Z'|'-' in an arithmetic operand, and it has been converted to 0."
severity WARNING;
end if;
end if;
end loop;
tmp := MAKE_BINARY(ARG(ARG'left));
if tmp = '1' then
if ARG'length = 32 then
result := (result - 2**30) - 2**30;
else
result := result - (2 ** (ARG'length-1));
end if;
end if;
return result;
-- --synopsys synthesis_on
end;
function CONV_INTEGER(ARG: STD_ULOGIC) return SMALL_INT is
variable tmp: STD_ULOGIC;
-- --synopsys built_in SYN_FEED_THRU
-- --synopsys subpgm_id 370
begin
-- --synopsys synthesis_off
tmp := tbl_BINARY(ARG);
if tmp = '1' then
return 1;
elsif tmp = 'X' then
assert false
report "CONV_INTEGER: There is an 'U'|'X'|'W'|'Z'|'-' in an arithmetic operand, and it has been converted to 0."
severity WARNING;
return 0;
else
return 0;
end if;
-- --synopsys synthesis_on
end;
-- convert an integer to a unsigned STD_ULOGIC_VECTOR
function CONV_UNSIGNED(ARG: INTEGER; SIZE: INTEGER) return UNSIGNED is
variable result: UNSIGNED(SIZE-1 downto 0);
variable temp: integer;
-- --synopsys built_in SYN_INTEGER_TO_UNSIGNED
-- --synopsys subpgm_id 371
begin
-- --synopsys synthesis_off
temp := ARG;
for i in 0 to SIZE-1 loop
if (temp mod 2) = 1 then
result(i) := '1';
else
result(i) := '0';
end if;
if temp > 0 then
temp := temp / 2;
else
temp := (temp - 1) / 2; -- simulate ASR
end if;
end loop;
return result;
-- --synopsys synthesis_on
end;
function CONV_UNSIGNED(ARG: UNSIGNED; SIZE: INTEGER) return UNSIGNED is
constant msb: INTEGER := min(ARG'length, SIZE) - 1;
subtype rtype is UNSIGNED (SIZE-1 downto 0);
variable new_bounds: UNSIGNED (ARG'length-1 downto 0);
variable result: rtype;
-- --synopsys built_in SYN_ZERO_EXTEND
-- --synopsys subpgm_id 372
begin
-- --synopsys synthesis_off
new_bounds := MAKE_BINARY(ARG);
if (new_bounds(0) = 'X') then
result := rtype'(others => 'X');
return result;
end if;
result := rtype'(others => '0');
result(msb downto 0) := new_bounds(msb downto 0);
return result;
-- --synopsys synthesis_on
end;
function CONV_UNSIGNED(ARG: SIGNED; SIZE: INTEGER) return UNSIGNED is
constant msb: INTEGER := min(ARG'length, SIZE) - 1;
subtype rtype is UNSIGNED (SIZE-1 downto 0);
variable new_bounds: UNSIGNED (ARG'length-1 downto 0);
variable result: rtype;
-- --synopsys built_in SYN_SIGN_EXTEND
-- --synopsys subpgm_id 373
begin
-- --synopsys synthesis_off
new_bounds := MAKE_BINARY(ARG);
if (new_bounds(0) = 'X') then
result := rtype'(others => 'X');
return result;
end if;
result := rtype'(others => new_bounds(new_bounds'left));
result(msb downto 0) := new_bounds(msb downto 0);
return result;
-- --synopsys synthesis_on
end;
function CONV_UNSIGNED(ARG: STD_ULOGIC; SIZE: INTEGER) return UNSIGNED is
subtype rtype is UNSIGNED (SIZE-1 downto 0);
variable result: rtype;
-- --synopsys built_in SYN_ZERO_EXTEND
-- --synopsys subpgm_id 375
begin
-- --synopsys synthesis_off
result := rtype'(others => '0');
result(0) := MAKE_BINARY(ARG);
if (result(0) = 'X') then
result := rtype'(others => 'X');
end if;
return result;
-- --synopsys synthesis_on
end;
-- convert an integer to a 2's complement STD_ULOGIC_VECTOR
function CONV_SIGNED(ARG: INTEGER; SIZE: INTEGER) return SIGNED is
variable result: SIGNED (SIZE-1 downto 0);
variable temp: integer;
-- --synopsys built_in SYN_INTEGER_TO_SIGNED
-- --synopsys subpgm_id 376
begin
-- --synopsys synthesis_off
temp := ARG;
for i in 0 to SIZE-1 loop
if (temp mod 2) = 1 then
result(i) := '1';
else
result(i) := '0';
end if;
if temp > 0 then
temp := temp / 2;
elsif (temp > integer'low) then
temp := (temp - 1) / 2; -- simulate ASR
else
temp := temp / 2; -- simulate ASR
end if;
end loop;
return result;
-- --synopsys synthesis_on
end;
function CONV_SIGNED(ARG: UNSIGNED; SIZE: INTEGER) return SIGNED is
constant msb: INTEGER := min(ARG'length, SIZE) - 1;
subtype rtype is SIGNED (SIZE-1 downto 0);
variable new_bounds : SIGNED (ARG'length-1 downto 0);
variable result: rtype;
-- --synopsys built_in SYN_ZERO_EXTEND
-- --synopsys subpgm_id 377
begin
-- --synopsys synthesis_off
new_bounds := MAKE_BINARY(ARG);
if (new_bounds(0) = 'X') then
result := rtype'(others => 'X');
return result;
end if;
result := rtype'(others => '0');
result(msb downto 0) := new_bounds(msb downto 0);
return result;
-- --synopsys synthesis_on
end;
function CONV_SIGNED(ARG: SIGNED; SIZE: INTEGER) return SIGNED is
constant msb: INTEGER := min(ARG'length, SIZE) - 1;
subtype rtype is SIGNED (SIZE-1 downto 0);
variable new_bounds : SIGNED (ARG'length-1 downto 0);
variable result: rtype;
-- --synopsys built_in SYN_SIGN_EXTEND
-- --synopsys subpgm_id 378
begin
-- --synopsys synthesis_off
new_bounds := MAKE_BINARY(ARG);
if (new_bounds(0) = 'X') then
result := rtype'(others => 'X');
return result;
end if;
result := rtype'(others => new_bounds(new_bounds'left));
result(msb downto 0) := new_bounds(msb downto 0);
return result;
-- --synopsys synthesis_on
end;
function CONV_SIGNED(ARG: STD_ULOGIC; SIZE: INTEGER) return SIGNED is
subtype rtype is SIGNED (SIZE-1 downto 0);
variable result: rtype;
-- --synopsys built_in SYN_ZERO_EXTEND
-- --synopsys subpgm_id 380
begin
-- --synopsys synthesis_off
result := rtype'(others => '0');
result(0) := MAKE_BINARY(ARG);
if (result(0) = 'X') then
result := rtype'(others => 'X');
end if;
return result;
-- --synopsys synthesis_on
end;
-- convert an integer to an STD_LOGIC_VECTOR
function CONV_STD_LOGIC_VECTOR(ARG: INTEGER; SIZE: INTEGER) return STD_LOGIC_VECTOR is
variable result: STD_LOGIC_VECTOR (SIZE-1 downto 0);
variable temp: integer;
-- --synopsys built_in SYN_INTEGER_TO_SIGNED
-- --synopsys subpgm_id 381
begin
-- --synopsys synthesis_off
temp := ARG;
for i in 0 to SIZE-1 loop
if (temp mod 2) = 1 then
result(i) := '1';
else
result(i) := '0';
end if;
if temp > 0 then
temp := temp / 2;
elsif (temp > integer'low) then
temp := (temp - 1) / 2; -- simulate ASR
else
temp := temp / 2; -- simulate ASR
end if;
end loop;
return result;
-- --synopsys synthesis_on
end;
function CONV_STD_LOGIC_VECTOR(ARG: UNSIGNED; SIZE: INTEGER) return STD_LOGIC_VECTOR is
constant msb: INTEGER := min(ARG'length, SIZE) - 1;
subtype rtype is STD_LOGIC_VECTOR (SIZE-1 downto 0);
variable new_bounds : STD_LOGIC_VECTOR (ARG'length-1 downto 0);
variable result: rtype;
-- --synopsys built_in SYN_ZERO_EXTEND
-- --synopsys subpgm_id 382
begin
-- --synopsys synthesis_off
new_bounds := MAKE_BINARY(ARG);
if (new_bounds(0) = 'X') then
result := rtype'(others => 'X');
return result;
end if;
result := rtype'(others => '0');
result(msb downto 0) := new_bounds(msb downto 0);
return result;
-- --synopsys synthesis_on
end;
function CONV_STD_LOGIC_VECTOR(ARG: SIGNED; SIZE: INTEGER) return STD_LOGIC_VECTOR is
constant msb: INTEGER := min(ARG'length, SIZE) - 1;
subtype rtype is STD_LOGIC_VECTOR (SIZE-1 downto 0);
variable new_bounds : STD_LOGIC_VECTOR (ARG'length-1 downto 0);
variable result: rtype;
-- --synopsys built_in SYN_SIGN_EXTEND
-- --synopsys subpgm_id 383
begin
-- --synopsys synthesis_off
new_bounds := MAKE_BINARY(ARG);
if (new_bounds(0) = 'X') then
result := rtype'(others => 'X');
return result;
end if;
result := rtype'(others => new_bounds(new_bounds'left));
result(msb downto 0) := new_bounds(msb downto 0);
return result;
-- --synopsys synthesis_on
end;
function CONV_STD_LOGIC_VECTOR(ARG: STD_ULOGIC; SIZE: INTEGER) return STD_LOGIC_VECTOR is
subtype rtype is STD_LOGIC_VECTOR (SIZE-1 downto 0);
variable result: rtype;
-- --synopsys built_in SYN_ZERO_EXTEND
-- --synopsys subpgm_id 384
begin
-- --synopsys synthesis_off
result := rtype'(others => '0');
result(0) := MAKE_BINARY(ARG);
if (result(0) = 'X') then
result := rtype'(others => 'X');
end if;
return result;
-- --synopsys synthesis_on
end;
function EXT(ARG: STD_LOGIC_VECTOR; SIZE: INTEGER)
return STD_LOGIC_VECTOR is
constant msb: INTEGER := min(ARG'length, SIZE) - 1;
subtype rtype is STD_LOGIC_VECTOR (SIZE-1 downto 0);
variable new_bounds: STD_LOGIC_VECTOR (ARG'length-1 downto 0);
variable result: rtype;
-- --synopsys built_in SYN_ZERO_EXTEND
-- --synopsys subpgm_id 385
begin
-- --synopsys synthesis_off
new_bounds := MAKE_BINARY(ARG);
if (new_bounds(0) = 'X') then
result := rtype'(others => 'X');
return result;
end if;
result := rtype'(others => '0');
result(msb downto 0) := new_bounds(msb downto 0);
return result;
-- --synopsys synthesis_on
end;
function SXT(ARG: STD_LOGIC_VECTOR; SIZE: INTEGER) return STD_LOGIC_VECTOR is
constant msb: INTEGER := min(ARG'length, SIZE) - 1;
subtype rtype is STD_LOGIC_VECTOR (SIZE-1 downto 0);
variable new_bounds : STD_LOGIC_VECTOR (ARG'length-1 downto 0);
variable result: rtype;
-- --synopsys built_in SYN_SIGN_EXTEND
-- --synopsys subpgm_id 386
begin
-- --synopsys synthesis_off
new_bounds := MAKE_BINARY(ARG);
if (new_bounds(0) = 'X') then
result := rtype'(others => 'X');
return result;
end if;
result := rtype'(others => new_bounds(new_bounds'left));
result(msb downto 0) := new_bounds(msb downto 0);
return result;
-- --synopsys synthesis_on
end;
end std_logic_arith;
|
-- NEED RESULT: ARCH00414.P1: Multi inertial transactions occurred on concurrent signal asg passed
-- NEED RESULT: ARCH00414: One inertial transaction occurred on a concurrent signal asg passed
-- NEED RESULT: ARCH00414: Old transactions were removed on a concurrent signal asg passed
-- NEED RESULT: ARCH00414: One inertial transaction occurred on a concurrent signal asg passed
-- NEED RESULT: ARCH00414: Inertial semantics check on a concurrent signal asg passed
-- NEED RESULT: P1: Inertial transactions completed entirely passed
-------------------------------------------------------------------------------
--
-- Copyright (c) 1989 by Intermetrics, Inc.
-- All rights reserved.
--
-------------------------------------------------------------------------------
--
-- TEST NAME:
--
-- CT00414
--
-- AUTHOR:
--
-- G. Tominovich
--
-- TEST OBJECTIVES:
--
-- 9.5 (3)
-- 9.5.1 (1)
-- 9.5.1 (2)
--
-- DESIGN UNIT ORDERING:
--
-- ENT00414(ARCH00414)
-- ENT00414_Test_Bench(ARCH00414_Test_Bench)
--
-- REVISION HISTORY:
--
-- 30-JUL-1987 - initial revision
--
-- NOTES:
--
-- self-checking
-- automatically generated
--
use WORK.STANDARD_TYPES.all ;
entity ENT00414 is
end ENT00414 ;
--
--
architecture ARCH00414 of ENT00414 is
subtype chk_sig_type is integer range -1 to 100 ;
signal chk_st_rec3 : chk_sig_type := -1 ;
--
subtype chk_time_type is Time ;
signal s_st_rec3_savt : chk_time_type := 0 ns ;
--
subtype chk_cnt_type is Integer ;
signal s_st_rec3_cnt : chk_cnt_type := 0 ;
--
type select_type is range 1 to 6 ;
signal st_rec3_select : select_type := 1 ;
--
signal s_st_rec3 : st_rec3
:= c_st_rec3_1 ;
--
begin
CHG1 :
process
variable correct : boolean ;
begin
case s_st_rec3_cnt is
when 0
=> null ;
-- s_st_rec3.f3(lowb,true)(lowb to highb-1) <=
-- c_st_rec3_2.f3(lowb,true)(lowb to highb-1) after 10 ns,
-- c_st_rec3_1.f3(lowb,true)(lowb to highb-1) after 20 ns ;
--
when 1
=> correct :=
s_st_rec3.f3(lowb,true)(lowb to highb-1) =
c_st_rec3_2.f3(lowb,true)(lowb to highb-1) and
(s_st_rec3_savt + 10 ns) = Std.Standard.Now ;
--
when 2
=> correct :=
correct and
s_st_rec3.f3(lowb,true)(lowb to highb-1) =
c_st_rec3_1.f3(lowb,true)(lowb to highb-1) and
(s_st_rec3_savt + 10 ns) = Std.Standard.Now ;
test_report ( "ARCH00414.P1" ,
"Multi inertial transactions occurred on " &
"concurrent signal asg",
correct ) ;
--
st_rec3_select <= transport 2 ;
-- s_st_rec3.f3(lowb,true)(lowb to highb-1) <=
-- c_st_rec3_2.f3(lowb,true)(lowb to highb-1) after 10 ns ,
-- c_st_rec3_1.f3(lowb,true)(lowb to highb-1) after 20 ns ,
-- c_st_rec3_2.f3(lowb,true)(lowb to highb-1) after 30 ns ,
-- c_st_rec3_1.f3(lowb,true)(lowb to highb-1) after 40 ns ;
--
when 3
=> correct :=
s_st_rec3.f3(lowb,true)(lowb to highb-1) =
c_st_rec3_2.f3(lowb,true)(lowb to highb-1) and
(s_st_rec3_savt + 10 ns) = Std.Standard.Now ;
st_rec3_select <= transport 3 ;
-- s_st_rec3.f3(lowb,true)(lowb to highb-1) <=
-- c_st_rec3_1.f3(lowb,true)(lowb to highb-1) after 5 ns ;
--
when 4
=> correct :=
correct and
s_st_rec3.f3(lowb,true)(lowb to highb-1) =
c_st_rec3_1.f3(lowb,true)(lowb to highb-1) and
(s_st_rec3_savt + 5 ns) = Std.Standard.Now ;
test_report ( "ARCH00414" ,
"One inertial transaction occurred on a " &
"concurrent signal asg",
correct ) ;
st_rec3_select <= transport 4 ;
-- s_st_rec3.f3(lowb,true)(lowb to highb-1) <=
-- c_st_rec3_1.f3(lowb,true)(lowb to highb-1) after 100 ns ;
--
when 5
=> correct :=
correct and
s_st_rec3.f3(lowb,true)(lowb to highb-1) =
c_st_rec3_1.f3(lowb,true)(lowb to highb-1) and
(s_st_rec3_savt + 100 ns) = Std.Standard.Now ;
test_report ( "ARCH00414" ,
"Old transactions were removed on a " &
"concurrent signal asg",
correct ) ;
st_rec3_select <= transport 5 ;
-- s_st_rec3.f3(lowb,true)(lowb to highb-1) <=
-- c_st_rec3_2.f3(lowb,true)(lowb to highb-1) after 10 ns ,
-- c_st_rec3_1.f3(lowb,true)(lowb to highb-1) after 20 ns ,
-- c_st_rec3_2.f3(lowb,true)(lowb to highb-1) after 30 ns ,
-- c_st_rec3_1.f3(lowb,true)(lowb to highb-1) after 40 ns ;
--
when 6
=> correct :=
correct and
s_st_rec3.f3(lowb,true)(lowb to highb-1) =
c_st_rec3_2.f3(lowb,true)(lowb to highb-1) and
(s_st_rec3_savt + 10 ns) = Std.Standard.Now ;
test_report ( "ARCH00414" ,
"One inertial transaction occurred on a " &
"concurrent signal asg",
correct ) ;
st_rec3_select <= transport 6 ;
-- Last transaction above is marked
-- s_st_rec3.f3(lowb,true)(lowb to highb-1) <=
-- c_st_rec3_1.f3(lowb,true)(lowb to highb-1) after 40 ns ;
--
when 7
=> correct :=
correct and
s_st_rec3.f3(lowb,true)(lowb to highb-1) =
c_st_rec3_1.f3(lowb,true)(lowb to highb-1) and
(s_st_rec3_savt + 30 ns) = Std.Standard.Now ;
--
when 8
=> correct :=
correct and
s_st_rec3.f3(lowb,true)(lowb to highb-1) =
c_st_rec3_1.f3(lowb,true)(lowb to highb-1) and
(s_st_rec3_savt + 10 ns) = Std.Standard.Now ;
test_report ( "ARCH00414" ,
"Inertial semantics check on a concurrent " &
"signal asg",
correct ) ;
--
when others
=> -- No more transactions should have occurred
test_report ( "ARCH00414" ,
"Inertial semantics check on a concurrent " &
"signal asg",
false ) ;
--
end case ;
--
s_st_rec3_savt <= transport Std.Standard.Now ;
chk_st_rec3 <= transport s_st_rec3_cnt
after (1 us - Std.Standard.Now) ;
s_st_rec3_cnt <= transport s_st_rec3_cnt + 1 ;
wait until (not s_st_rec3.f3(lowb,true)(lowb to highb-1)'Quiet) and
(s_st_rec3_savt /= Std.Standard.Now) ;
--
end process CHG1 ;
--
PGEN_CHKP_1 :
process ( chk_st_rec3 )
begin
if Std.Standard.Now > 0 ns then
test_report ( "P1" ,
"Inertial transactions completed entirely",
chk_st_rec3 = 8 ) ;
end if ;
end process PGEN_CHKP_1 ;
--
--
s_st_rec3.f3(lowb,true)(lowb to highb-1) <=
c_st_rec3_2.f3(lowb,true)(lowb to highb-1) after 10 ns,
c_st_rec3_1.f3(lowb,true)(lowb to highb-1) after 20 ns
when st_rec3_select = 1 else
--
c_st_rec3_2.f3(lowb,true)(lowb to highb-1) after 10 ns ,
c_st_rec3_1.f3(lowb,true)(lowb to highb-1) after 20 ns ,
c_st_rec3_2.f3(lowb,true)(lowb to highb-1) after 30 ns ,
c_st_rec3_1.f3(lowb,true)(lowb to highb-1) after 40 ns
when st_rec3_select = 2 else
--
c_st_rec3_1.f3(lowb,true)(lowb to highb-1) after 5 ns
when st_rec3_select = 3 else
--
c_st_rec3_1.f3(lowb,true)(lowb to highb-1) after 100 ns
when st_rec3_select = 4 else
--
c_st_rec3_2.f3(lowb,true)(lowb to highb-1) after 10 ns ,
c_st_rec3_1.f3(lowb,true)(lowb to highb-1) after 20 ns ,
c_st_rec3_2.f3(lowb,true)(lowb to highb-1) after 30 ns ,
c_st_rec3_1.f3(lowb,true)(lowb to highb-1) after 40 ns
when st_rec3_select = 5 else
--
-- Last transaction above is marked
c_st_rec3_1.f3(lowb,true)(lowb to highb-1) after 40 ns ;
--
end ARCH00414 ;
--
--
use WORK.STANDARD_TYPES.all ;
entity ENT00414_Test_Bench is
end ENT00414_Test_Bench ;
--
--
architecture ARCH00414_Test_Bench of ENT00414_Test_Bench is
begin
L1:
block
component UUT
end component ;
--
for CIS1 : UUT use entity WORK.ENT00414 ( ARCH00414 ) ;
begin
CIS1 : UUT
;
end block L1 ;
end ARCH00414_Test_Bench ;
|
-------------------------------------------------------------------------------
-- Title : HDLC async Encoder & Decoder
-------------------------------------------------------------------------------
-- Author : Carl Treudler (cjt@users.sourceforge.net)
-- Standard : VHDL'93/02
-------------------------------------------------------------------------------
-- Description:
-- * Encodes/decodes 8-Bit HDLC async framing int 8-bit data + frame delimiter.
-- * Includes loa busmaster controlled over hdlc channel.
--
-------------------------------------------------------------------------------
-- Copyright (c) 2013, Carl Treudler
-- All Rights Reserved.
--
-- The file is part for the Loa project and is released under the
-- 3-clause BSD license. See the file `LICENSE` for the full license
-- governing this code.
-------------------------------------------------------------------------------
library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
library work;
use work.bus_pkg.all;
package hdlc_pkg is
type hdlc_enc_in_type is record
data : std_logic_vector(8 downto 0);
enable : std_logic;
end record;
type hdlc_enc_out_type is record
data : std_logic_vector(7 downto 0);
enable : std_logic;
end record;
subtype hdlc_dec_in_type is hdlc_enc_out_type;
subtype hdlc_dec_out_type is hdlc_enc_in_type;
component hdlc_enc is
port(
din_p : in hdlc_enc_in_type;
dout_p : out hdlc_enc_out_type;
busy_p : out std_logic;
clk : in std_logic
);
end component;
component hdlc_dec is
port(
din_p : in hdlc_dec_in_type;
dout_p : out hdlc_dec_out_type;
clk : in std_logic
);
end component;
component hdlc_busmaster
port (
din_p : in hdlc_dec_out_type;
dout_p : out hdlc_enc_in_type;
bus_o : out busmaster_out_type;
bus_i : in busmaster_in_type;
clk : in std_logic);
end component;
end package hdlc_pkg;
|
------------------------------------------------------------------------------
-- This file is a part of the GRLIB VHDL IP LIBRARY
-- Copyright (C) 2003 - 2008, Gaisler Research
-- Copyright (C) 2008 - 2014, Aeroflex Gaisler
-- Copyright (C) 2015 - 2016, Cobham Gaisler
--
-- This program is free software; you can redistribute it and/or modify
-- it under the terms of the GNU General Public License as published by
-- the Free Software Foundation; either version 2 of the License, or
-- (at your option) any later version.
--
-- This program is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-- GNU General Public License for more details.
--
-- You should have received a copy of the GNU General Public License
-- along with this program; if not, write to the Free Software
-- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
-----------------------------------------------------------------------------
-- Entity: syncrambw
-- File: syncrambw.vhd
-- Author: Jan Andersson - Aeroflex Gaisler
-- Description: Synchronous 1-port ram with 8-bit write strobes
-- and tech selection
------------------------------------------------------------------------------
library ieee;
library techmap;
use ieee.std_logic_1164.all;
use techmap.gencomp.all;
use techmap.allmem.all;
library grlib;
use grlib.config.all;
use grlib.config_types.all;
use grlib.stdlib.all;
entity syncrambw is
generic (tech : integer := 0; abits : integer := 6; dbits : integer := 8;
testen : integer := 0; custombits: integer := 1);
port (
clk : in std_ulogic;
address : in std_logic_vector (abits-1 downto 0);
datain : in std_logic_vector (dbits-1 downto 0);
dataout : out std_logic_vector (dbits-1 downto 0);
enable : in std_logic_vector (dbits/8-1 downto 0);
write : in std_logic_vector (dbits/8-1 downto 0);
testin : in std_logic_vector (TESTIN_WIDTH-1 downto 0) := testin_none
);
end;
architecture rtl of syncrambw is
constant nctrl : integer := abits + (TESTIN_WIDTH-2) + 2*dbits/8;
signal dataoutx, databp, testdata : std_logic_vector((dbits -1) downto 0);
constant SCANTESTBP : boolean := (testen = 1) and syncram_add_scan_bypass(tech)=1;
signal xenable, xwrite : std_logic_vector(dbits/8-1 downto 0);
signal custominx,customoutx: std_logic_vector(syncram_customif_maxwidth downto 0);
begin
xenable <= enable when testen=0 or testin(TESTIN_WIDTH-2)='0' else (others => '0');
xwrite <= write when testen=0 or testin(TESTIN_WIDTH-2)='0' else (others => '0');
sbw : if has_srambw(tech) = 1 generate
-- RAM bypass for scan
scanbp : if SCANTESTBP generate
comb : process (address, datain, enable, write, testin)
variable tmp : std_logic_vector((dbits -1) downto 0);
variable ctrlsigs : std_logic_vector((nctrl -1) downto 0);
begin
ctrlsigs := testin(TESTIN_WIDTH-3 downto 0) & write & enable & address;
tmp := datain;
for i in 0 to nctrl-1 loop
tmp(i mod dbits) := tmp(i mod dbits) xor ctrlsigs(i);
end loop;
testdata <= tmp;
end process;
reg : process (clk)
begin
if rising_edge(clk) then
databp <= testdata;
end if;
end process;
dmuxout : for i in 0 to dbits-1 generate
x0: grmux2 generic map (tech)
port map (dataoutx(i), databp(i), testin(TESTIN_WIDTH-1), dataout(i));
end generate;
end generate;
noscanbp : if not SCANTESTBP generate dataout <= dataoutx; end generate;
n2x : if tech = easic45 generate
x0 : n2x_syncram_be generic map (abits, dbits)
port map (clk, address, datain, dataoutx, xenable, xwrite);
end generate;
uni : if is_unisim(tech) = 1 generate
x0 : unisim_syncram_be generic map (abits, dbits, tech)
port map (clk, address, datain, dataoutx, xenable, xwrite);
end generate;
rt4 : if tech = rtg4 generate
x0 : rtg4_syncram_be generic map (abits, dbits)
port map (clk, address, datain, dataoutx, xenable, xwrite);
end generate;
igl2 : if (tech = igloo2) or (tech = smartfusion2) generate
x0 : igloo2_syncram_be generic map (abits, dbits)
port map (clk, address, datain, dataoutx, xenable, xwrite);
end generate;
-- pragma translate_off
dmsg : if GRLIB_CONFIG_ARRAY(grlib_debug_level) >= 2 generate
x : process
begin
assert false report "syncrambw: " & tost(2**abits) & "x" & tost(dbits) &
" (" & tech_table(tech) & ")"
severity note;
wait;
end process;
end generate;
-- pragma translate_on
end generate;
nosbw : if has_srambw(tech) = 0 generate
rx : for i in 0 to dbits/8-1 generate
x0 : syncram generic map (tech, abits, 8, testen, custombits)
port map (clk, address, datain(i*8+7 downto i*8),
dataoutx(i*8+7 downto i*8), enable(i), write(i), testin
);
end generate;
dataout <= dataoutx;
end generate;
custominx <= (others => '0');
nocust: if has_srambw(tech)=0 or syncram_has_customif(tech)=0 generate
customoutx <= (others => '0');
end generate;
end;
|
library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
entity foo is
port (
a0 : in unsigned(1 downto 0)
);
end entity;
architecture bar of foo is
begin
assert a0 = "01";
end architecture;
library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
entity foo_tb is
generic
( DEFAULT_X : unsigned(1 downto 0) := (others => '0')
);
end entity;
architecture tb of foo_tb is
function compute_stuff_with_x(x : unsigned) return unsigned is
begin
return x + 1;
end compute_stuff_with_x;
begin
foo_inst:
entity work.foo
port map
( a0 => compute_stuff_with_x(DEFAULT_X)
);
end architecture;
|
library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
entity foo is
port (
a0 : in unsigned(1 downto 0)
);
end entity;
architecture bar of foo is
begin
assert a0 = "01";
end architecture;
library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
entity foo_tb is
generic
( DEFAULT_X : unsigned(1 downto 0) := (others => '0')
);
end entity;
architecture tb of foo_tb is
function compute_stuff_with_x(x : unsigned) return unsigned is
begin
return x + 1;
end compute_stuff_with_x;
begin
foo_inst:
entity work.foo
port map
( a0 => compute_stuff_with_x(DEFAULT_X)
);
end architecture;
|
---------------------------------------------------------
-- MC613 - UNICAMP
--
-- Minesweeper
--
-- Caian Benedicto
-- Brunno Rodrigues Arangues
---------------------------------------------------------
library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_unsigned.all;
library work;
use work.all;
entity vga_face_dec is
port(
-- Estado do botao esquerdo do mouse
mouse_click_l : in std_logic;
-- Estado do jogo
game_state : in std_logic_vector(1 downto 0);
-- Tipo do elemento e indice na ROM
element : in std_logic_vector (7 downto 0);
elemidx : out std_logic_vector (5 downto 0)
);
end entity;
architecture vga_face_dec_logic of vga_face_dec is
signal sel : std_logic_vector (2 downto 0);
signal mode : std_logic_vector (1 downto 0);
begin
sel <= game_state & mouse_click_l;
with sel select
mode <=
"01" when "001",
"10" when "100",
"10" when "101",
"11" when "110",
"11" when "111",
"00" when others;
elemidx <= "01" & element(1 downto 0) & mode;
end;
|
LIBRARY ieee;
USE ieee.std_logic_1164.all;
USE ieee.std_logic_unsigned.all;
USE ieee.std_logic_arith.all;
--******************************************************************************
--*** ***
--*** ALTERA FLOATING POINT DATAPATH COMPILER ***
--*** ***
--*** HCC_CASTXTOF.VHD ***
--*** ***
--*** Function: Cast Internal Single to IEEE754 ***
--*** Single ***
--*** ***
--*** 14/07/07 ML ***
--*** ***
--*** (c) 2007 Altera Corporation ***
--*** ***
--*** Change History ***
--*** ***
--*** 17/04/09 - add NAN support, also fixed zero/infinity/nan mantissa ***
--*** 29/04/09 - zero output if mantissa in zero ***
--*** ***
--******************************************************************************
--******************************************************************************
--*** Latency: 5 + 2*(swSingleNormSpeed-1) ***
--******************************************************************************
ENTITY hcc_castxtof IS
GENERIC (
mantissa : positive := 32; -- 32 or 36
normspeed : positive := 2 -- 1 or 2
);
PORT (
sysclk : IN STD_LOGIC;
reset : IN STD_LOGIC;
enable : IN STD_LOGIC;
aa : IN STD_LOGIC_VECTOR (mantissa+10 DOWNTO 1);
aasat, aazip, aanan : IN STD_LOGIC;
cc : OUT STD_LOGIC_VECTOR (32 DOWNTO 1)
);
END hcc_castxtof;
ARCHITECTURE rtl OF hcc_castxtof IS
-- latency = 5 if normspeed = 1
-- latency = 7 if normspeed = 2 (extra pipe in normusgn3236 and output stage)
type exptopfftype IS ARRAY (3 DOWNTO 1) OF STD_LOGIC_VECTOR (10 DOWNTO 1);
type expbotfftype IS ARRAY (2 DOWNTO 1) OF STD_LOGIC_VECTOR (10 DOWNTO 1);
signal zerovec : STD_LOGIC_VECTOR (mantissa-1 DOWNTO 1);
signal count : STD_LOGIC_VECTOR (6 DOWNTO 1);
signal aaff : STD_LOGIC_VECTOR (mantissa+10 DOWNTO 1);
signal absnode, absroundnode, absff : STD_LOGIC_VECTOR (mantissa DOWNTO 1);
signal fracout, fracoutff : STD_LOGIC_VECTOR (mantissa DOWNTO 1);
signal exptopff : exptopfftype;
signal expbotff : expbotfftype;
signal roundoverflow : STD_LOGIC_VECTOR (24 DOWNTO 1);
signal roundoverflowff : STD_LOGIC;
signal satff, zipff, nanff : STD_LOGIC_VECTOR (3+normspeed DOWNTO 1);
signal signff : STD_LOGIC_VECTOR (2+2*normspeed DOWNTO 1);
signal zeronumber : STD_LOGIC_VECTOR (mantissa DOWNTO 1);
signal zeronumberff : STD_LOGIC_VECTOR (1+normspeed DOWNTO 1);
signal preexpnode, expnode : STD_LOGIC_VECTOR (10 DOWNTO 1);
signal exponentff : STD_LOGIC_VECTOR (8 DOWNTO 1);
signal mantissanode : STD_LOGIC_VECTOR (23 DOWNTO 1);
signal roundbit : STD_LOGIC;
signal mantissaroundff : STD_LOGIC_VECTOR (23 DOWNTO 1);
signal mantissaff : STD_LOGIC_VECTOR (23 DOWNTO 1);
signal zeroexpnode, maxexpnode : STD_LOGIC;
signal zeromantissanode, maxmantissanode : STD_LOGIC;
signal zeroexponentnode, maxexponentnode : STD_LOGIC;
signal zeromantissaff, maxmantissaff : STD_LOGIC;
signal zeroexponentff, maxexponentff : STD_LOGIC;
signal ccsgn : STD_LOGIC;
signal aaexp : STD_LOGIC_VECTOR (10 DOWNTO 1);
signal ccexp : STD_LOGIC_VECTOR (8 DOWNTO 1);
signal aaman : STD_LOGIC_VECTOR (mantissa DOWNTO 1);
signal ccman : STD_LOGIC_VECTOR (23 DOWNTO 1);
component hcc_normusgn3236 IS
GENERIC (
mantissa : positive := 32;
normspeed : positive := 1 -- 1 or 2
);
PORT (
sysclk : IN STD_LOGIC;
reset : IN STD_LOGIC;
enable : IN STD_LOGIC;
fracin : IN STD_LOGIC_VECTOR (mantissa DOWNTO 1);
countout : OUT STD_LOGIC_VECTOR (6 DOWNTO 1); -- 1 clock earlier than fracout
fracout : OUT STD_LOGIC_VECTOR (mantissa DOWNTO 1)
);
end component;
BEGIN
gza: FOR k IN 1 TO mantissa-1 GENERATE
zerovec(k) <= '0';
END GENERATE;
pclk: PROCESS (sysclk,reset)
BEGIN
IF (reset = '1') THEN
FOR k IN 1 TO mantissa+10 LOOP
aaff(k) <= '0';
END LOOP;
FOR k IN 1 TO mantissa LOOP
absff(k) <= '0';
END LOOP;
FOR k IN 1 TO mantissa LOOP
fracoutff(k) <= '0';
END LOOP;
FOR k IN 1 TO 3 LOOP
FOR j IN 1 TO 10 LOOP
exptopff(k)(j) <= '0';
END LOOP;
END LOOP;
roundoverflowff <= '0';
FOR k IN 1 TO 3+normspeed LOOP
satff(k) <= '0';
zipff(k) <= '0';
nanff(k) <= '0';
END LOOP;
FOR k IN 1 TO 2+2*normspeed LOOP
signff(k) <= '0';
END LOOP;
FOR k IN 1 TO 1+normspeed LOOP
zeronumberff(k) <= '0';
END LOOP;
ELSIF (rising_edge(sysclk)) THEN
IF (enable = '1') THEN
aaff <= aa;
absff <= absnode + absroundnode;
fracoutff <= fracout;
exptopff(1)(10 DOWNTO 1) <= aaff(10 DOWNTO 1);
-- add 4 because of maximum 4 bits wordgrowth in X mantissa
exptopff(2)(10 DOWNTO 1) <= exptopff(1)(10 DOWNTO 1) + "0000000100";
exptopff(3)(10 DOWNTO 1) <= exptopff(2)(10 DOWNTO 1) - ("0000" & count);
roundoverflowff <= roundoverflow(24);
satff(1) <= aasat;
FOR k IN 2 TO 3+normspeed LOOP
satff(k) <= satff(k-1);
END LOOP;
zipff(1) <= aazip;
FOR k IN 2 TO 3+normspeed LOOP
zipff(k) <= zipff(k-1);
END LOOP;
nanff(1) <= aanan;
FOR k IN 2 TO 3+normspeed LOOP
nanff(k) <= nanff(k-1);
END LOOP;
signff(1) <= aaff(mantissa+10);
FOR k IN 2 TO 2+2*normspeed LOOP
signff(k) <= signff(k-1);
END LOOP;
zeronumberff(1) <= NOT(zeronumber(mantissa));
FOR k IN 2 TO 1+normspeed LOOP
zeronumberff(k) <= zeronumberff(k-1);
END LOOP;
END IF;
END IF;
END PROCESS;
-- if normspeed = 1, latency = 5. if normspeed > 1, latency = 7
gsa: IF (normspeed = 1) GENERATE
pna: PROCESS (sysclk,reset)
BEGIN
IF (reset = '1') THEN
exponentff <= "00000000";
FOR k IN 1 TO 23 LOOP
mantissaff(k) <= '0';
END LOOP;
ELSIF (rising_edge(sysclk)) THEN
IF (enable = '1') THEN
FOR k IN 1 TO 8 LOOP
exponentff(k) <= (expnode(k) AND NOT(zeroexponentnode)) OR maxexponentnode;
END LOOP;
FOR k IN 1 TO 23 LOOP
mantissaff(k) <= (mantissanode(k) AND NOT(zeromantissanode)) OR maxmantissanode;
END LOOP;
END IF;
END IF;
END PROCESS;
preexpnode <= exptopff(3)(10 DOWNTO 1);
END GENERATE;
-- if normspeed = 1, latency = 5. if normspeed > 1, latency = 7
gsb: IF (normspeed = 2) GENERATE
pnb: PROCESS (sysclk,reset)
BEGIN
IF (reset = '1') THEN
expbotff(1)(10 DOWNTO 1) <= "0000000000";
expbotff(2)(10 DOWNTO 1) <= "0000000000";
exponentff <= "00000000";
FOR k IN 1 TO 23 LOOP
mantissaroundff(k) <= '0';
mantissaff(k) <= '0';
END LOOP;
zeromantissaff <= '0';
maxmantissaff <= '0';
zeroexponentff <= '0';
maxexponentff <= '0';
ELSIF (rising_edge(sysclk)) THEN
IF (enable = '1') THEN
expbotff(1)(10 DOWNTO 1) <= exptopff(3)(10 DOWNTO 1);
expbotff(2)(10 DOWNTO 1) <= expnode;
FOR k IN 1 TO 8 LOOP
exponentff(k) <= (expbotff(2)(k) AND NOT(zeroexponentff)) OR maxexponentff;
END LOOP;
mantissaroundff <= mantissanode;
FOR k IN 1 TO 23 LOOP
mantissaff(k) <= (mantissaroundff(k) AND NOT(zeromantissaff)) OR maxmantissaff;
END LOOP;
zeromantissaff <= zeromantissanode;
maxmantissaff <= maxmantissanode;
zeroexponentff <= zeroexponentnode;
maxexponentff <= maxexponentnode;
END IF;
END IF;
END PROCESS;
preexpnode <= expbotff(1)(10 DOWNTO 1);
END GENERATE;
-- round absolute value any way - need register on input of cntusgn
gaa: FOR k IN 1 TO mantissa GENERATE
absnode(k) <= aaff(k+10) XOR aaff(mantissa+10);
END GENERATE;
absroundnode <= zerovec(mantissa-1 DOWNTO 1) & aaff(mantissa+10);
zeronumber(1) <= absff(1);
gzma: FOR k IN 2 TO mantissa GENERATE
zeronumber(k) <= zeronumber(k-1) OR absff(k);
END GENERATE;
core: hcc_normusgn3236
GENERIC MAP (mantissa=>mantissa,normspeed=>normspeed)
PORT MAP (sysclk=>sysclk,reset=>reset,enable=>enable,
fracin=>absff(mantissa DOWNTO 1),countout=>count,
fracout=>fracout);
roundoverflow(1) <= fracout(7);
gna: FOR k IN 2 TO 24 GENERATE
roundoverflow(k) <= roundoverflow(k-1) AND fracout(k+6);
END GENERATE;
expnode <= preexpnode(10 DOWNTO 1) + ("000000000" & roundoverflowff);
-- always round single output (round to nearest even)
roundbit <= (fracoutff(mantissa-24) AND fracoutff(mantissa-25)) OR
(NOT(fracoutff(mantissa-24)) AND fracoutff(mantissa-25) AND
(fracoutff(mantissa-26) OR fracoutff(mantissa-27) OR fracoutff(mantissa-28)));
mantissanode <= fracoutff(mantissa-2 DOWNTO mantissa-24) +
(zerovec(22 DOWNTO 1) & roundbit);
--ML March 8, 2011 consider expnode(10 DOWNTO 9) for zeroexpnode and maxexpnode calculation
zeroexpnode <= NOT(expnode(10) OR
expnode(9) OR expnode(8) OR expnode(7) OR
expnode(6) OR expnode(5) OR expnode(4) OR
expnode(3) OR expnode(2) OR expnode(1));
maxexpnode <= NOT(expnode(10)) AND NOT(expnode(9)) AND
expnode(8) AND expnode(7) AND expnode(6) AND expnode(5) AND
expnode(4) AND expnode(3) AND expnode(2) AND expnode(1);
-- all following '1' when true
-- 24/03/09 - zeroexpnode, maxexpnode also zeros mantissa (SRC bug)
zeromantissanode <= roundoverflowff OR zeroexpnode OR maxexpnode OR
expnode(9) OR expnode(10) OR
zipff(3+normspeed) OR satff(3+normspeed) OR
zeronumberff(1+normspeed);
maxmantissanode <= nanff(3+normspeed);
zeroexponentnode <= zeroexpnode OR expnode(10) OR
zipff(3+normspeed) OR zeronumberff(1+normspeed);
maxexponentnode <= maxexpnode OR (expnode(9) AND NOT(expnode(10))) OR
satff(3+normspeed) OR nanff(3+normspeed);
--*** OUTPUTS ***
cc(32) <= signff(2+2*normspeed);
cc(31 DOWNTO 24) <= exponentff;
cc(23 DOWNTO 1) <= mantissaff(23 DOWNTO 1);
--*** DEBUG ***
aaexp <= aa(10 DOWNTO 1);
aaman <= aa(mantissa+10 DOWNTO 11);
ccsgn <= signff(2+2*normspeed);
ccexp <= exponentff;
ccman <= mantissaff(23 DOWNTO 1);
END rtl;
|
LIBRARY ieee;
USE ieee.std_logic_1164.all;
USE ieee.std_logic_unsigned.all;
USE ieee.std_logic_arith.all;
--******************************************************************************
--*** ***
--*** ALTERA FLOATING POINT DATAPATH COMPILER ***
--*** ***
--*** HCC_CASTXTOF.VHD ***
--*** ***
--*** Function: Cast Internal Single to IEEE754 ***
--*** Single ***
--*** ***
--*** 14/07/07 ML ***
--*** ***
--*** (c) 2007 Altera Corporation ***
--*** ***
--*** Change History ***
--*** ***
--*** 17/04/09 - add NAN support, also fixed zero/infinity/nan mantissa ***
--*** 29/04/09 - zero output if mantissa in zero ***
--*** ***
--******************************************************************************
--******************************************************************************
--*** Latency: 5 + 2*(swSingleNormSpeed-1) ***
--******************************************************************************
ENTITY hcc_castxtof IS
GENERIC (
mantissa : positive := 32; -- 32 or 36
normspeed : positive := 2 -- 1 or 2
);
PORT (
sysclk : IN STD_LOGIC;
reset : IN STD_LOGIC;
enable : IN STD_LOGIC;
aa : IN STD_LOGIC_VECTOR (mantissa+10 DOWNTO 1);
aasat, aazip, aanan : IN STD_LOGIC;
cc : OUT STD_LOGIC_VECTOR (32 DOWNTO 1)
);
END hcc_castxtof;
ARCHITECTURE rtl OF hcc_castxtof IS
-- latency = 5 if normspeed = 1
-- latency = 7 if normspeed = 2 (extra pipe in normusgn3236 and output stage)
type exptopfftype IS ARRAY (3 DOWNTO 1) OF STD_LOGIC_VECTOR (10 DOWNTO 1);
type expbotfftype IS ARRAY (2 DOWNTO 1) OF STD_LOGIC_VECTOR (10 DOWNTO 1);
signal zerovec : STD_LOGIC_VECTOR (mantissa-1 DOWNTO 1);
signal count : STD_LOGIC_VECTOR (6 DOWNTO 1);
signal aaff : STD_LOGIC_VECTOR (mantissa+10 DOWNTO 1);
signal absnode, absroundnode, absff : STD_LOGIC_VECTOR (mantissa DOWNTO 1);
signal fracout, fracoutff : STD_LOGIC_VECTOR (mantissa DOWNTO 1);
signal exptopff : exptopfftype;
signal expbotff : expbotfftype;
signal roundoverflow : STD_LOGIC_VECTOR (24 DOWNTO 1);
signal roundoverflowff : STD_LOGIC;
signal satff, zipff, nanff : STD_LOGIC_VECTOR (3+normspeed DOWNTO 1);
signal signff : STD_LOGIC_VECTOR (2+2*normspeed DOWNTO 1);
signal zeronumber : STD_LOGIC_VECTOR (mantissa DOWNTO 1);
signal zeronumberff : STD_LOGIC_VECTOR (1+normspeed DOWNTO 1);
signal preexpnode, expnode : STD_LOGIC_VECTOR (10 DOWNTO 1);
signal exponentff : STD_LOGIC_VECTOR (8 DOWNTO 1);
signal mantissanode : STD_LOGIC_VECTOR (23 DOWNTO 1);
signal roundbit : STD_LOGIC;
signal mantissaroundff : STD_LOGIC_VECTOR (23 DOWNTO 1);
signal mantissaff : STD_LOGIC_VECTOR (23 DOWNTO 1);
signal zeroexpnode, maxexpnode : STD_LOGIC;
signal zeromantissanode, maxmantissanode : STD_LOGIC;
signal zeroexponentnode, maxexponentnode : STD_LOGIC;
signal zeromantissaff, maxmantissaff : STD_LOGIC;
signal zeroexponentff, maxexponentff : STD_LOGIC;
signal ccsgn : STD_LOGIC;
signal aaexp : STD_LOGIC_VECTOR (10 DOWNTO 1);
signal ccexp : STD_LOGIC_VECTOR (8 DOWNTO 1);
signal aaman : STD_LOGIC_VECTOR (mantissa DOWNTO 1);
signal ccman : STD_LOGIC_VECTOR (23 DOWNTO 1);
component hcc_normusgn3236 IS
GENERIC (
mantissa : positive := 32;
normspeed : positive := 1 -- 1 or 2
);
PORT (
sysclk : IN STD_LOGIC;
reset : IN STD_LOGIC;
enable : IN STD_LOGIC;
fracin : IN STD_LOGIC_VECTOR (mantissa DOWNTO 1);
countout : OUT STD_LOGIC_VECTOR (6 DOWNTO 1); -- 1 clock earlier than fracout
fracout : OUT STD_LOGIC_VECTOR (mantissa DOWNTO 1)
);
end component;
BEGIN
gza: FOR k IN 1 TO mantissa-1 GENERATE
zerovec(k) <= '0';
END GENERATE;
pclk: PROCESS (sysclk,reset)
BEGIN
IF (reset = '1') THEN
FOR k IN 1 TO mantissa+10 LOOP
aaff(k) <= '0';
END LOOP;
FOR k IN 1 TO mantissa LOOP
absff(k) <= '0';
END LOOP;
FOR k IN 1 TO mantissa LOOP
fracoutff(k) <= '0';
END LOOP;
FOR k IN 1 TO 3 LOOP
FOR j IN 1 TO 10 LOOP
exptopff(k)(j) <= '0';
END LOOP;
END LOOP;
roundoverflowff <= '0';
FOR k IN 1 TO 3+normspeed LOOP
satff(k) <= '0';
zipff(k) <= '0';
nanff(k) <= '0';
END LOOP;
FOR k IN 1 TO 2+2*normspeed LOOP
signff(k) <= '0';
END LOOP;
FOR k IN 1 TO 1+normspeed LOOP
zeronumberff(k) <= '0';
END LOOP;
ELSIF (rising_edge(sysclk)) THEN
IF (enable = '1') THEN
aaff <= aa;
absff <= absnode + absroundnode;
fracoutff <= fracout;
exptopff(1)(10 DOWNTO 1) <= aaff(10 DOWNTO 1);
-- add 4 because of maximum 4 bits wordgrowth in X mantissa
exptopff(2)(10 DOWNTO 1) <= exptopff(1)(10 DOWNTO 1) + "0000000100";
exptopff(3)(10 DOWNTO 1) <= exptopff(2)(10 DOWNTO 1) - ("0000" & count);
roundoverflowff <= roundoverflow(24);
satff(1) <= aasat;
FOR k IN 2 TO 3+normspeed LOOP
satff(k) <= satff(k-1);
END LOOP;
zipff(1) <= aazip;
FOR k IN 2 TO 3+normspeed LOOP
zipff(k) <= zipff(k-1);
END LOOP;
nanff(1) <= aanan;
FOR k IN 2 TO 3+normspeed LOOP
nanff(k) <= nanff(k-1);
END LOOP;
signff(1) <= aaff(mantissa+10);
FOR k IN 2 TO 2+2*normspeed LOOP
signff(k) <= signff(k-1);
END LOOP;
zeronumberff(1) <= NOT(zeronumber(mantissa));
FOR k IN 2 TO 1+normspeed LOOP
zeronumberff(k) <= zeronumberff(k-1);
END LOOP;
END IF;
END IF;
END PROCESS;
-- if normspeed = 1, latency = 5. if normspeed > 1, latency = 7
gsa: IF (normspeed = 1) GENERATE
pna: PROCESS (sysclk,reset)
BEGIN
IF (reset = '1') THEN
exponentff <= "00000000";
FOR k IN 1 TO 23 LOOP
mantissaff(k) <= '0';
END LOOP;
ELSIF (rising_edge(sysclk)) THEN
IF (enable = '1') THEN
FOR k IN 1 TO 8 LOOP
exponentff(k) <= (expnode(k) AND NOT(zeroexponentnode)) OR maxexponentnode;
END LOOP;
FOR k IN 1 TO 23 LOOP
mantissaff(k) <= (mantissanode(k) AND NOT(zeromantissanode)) OR maxmantissanode;
END LOOP;
END IF;
END IF;
END PROCESS;
preexpnode <= exptopff(3)(10 DOWNTO 1);
END GENERATE;
-- if normspeed = 1, latency = 5. if normspeed > 1, latency = 7
gsb: IF (normspeed = 2) GENERATE
pnb: PROCESS (sysclk,reset)
BEGIN
IF (reset = '1') THEN
expbotff(1)(10 DOWNTO 1) <= "0000000000";
expbotff(2)(10 DOWNTO 1) <= "0000000000";
exponentff <= "00000000";
FOR k IN 1 TO 23 LOOP
mantissaroundff(k) <= '0';
mantissaff(k) <= '0';
END LOOP;
zeromantissaff <= '0';
maxmantissaff <= '0';
zeroexponentff <= '0';
maxexponentff <= '0';
ELSIF (rising_edge(sysclk)) THEN
IF (enable = '1') THEN
expbotff(1)(10 DOWNTO 1) <= exptopff(3)(10 DOWNTO 1);
expbotff(2)(10 DOWNTO 1) <= expnode;
FOR k IN 1 TO 8 LOOP
exponentff(k) <= (expbotff(2)(k) AND NOT(zeroexponentff)) OR maxexponentff;
END LOOP;
mantissaroundff <= mantissanode;
FOR k IN 1 TO 23 LOOP
mantissaff(k) <= (mantissaroundff(k) AND NOT(zeromantissaff)) OR maxmantissaff;
END LOOP;
zeromantissaff <= zeromantissanode;
maxmantissaff <= maxmantissanode;
zeroexponentff <= zeroexponentnode;
maxexponentff <= maxexponentnode;
END IF;
END IF;
END PROCESS;
preexpnode <= expbotff(1)(10 DOWNTO 1);
END GENERATE;
-- round absolute value any way - need register on input of cntusgn
gaa: FOR k IN 1 TO mantissa GENERATE
absnode(k) <= aaff(k+10) XOR aaff(mantissa+10);
END GENERATE;
absroundnode <= zerovec(mantissa-1 DOWNTO 1) & aaff(mantissa+10);
zeronumber(1) <= absff(1);
gzma: FOR k IN 2 TO mantissa GENERATE
zeronumber(k) <= zeronumber(k-1) OR absff(k);
END GENERATE;
core: hcc_normusgn3236
GENERIC MAP (mantissa=>mantissa,normspeed=>normspeed)
PORT MAP (sysclk=>sysclk,reset=>reset,enable=>enable,
fracin=>absff(mantissa DOWNTO 1),countout=>count,
fracout=>fracout);
roundoverflow(1) <= fracout(7);
gna: FOR k IN 2 TO 24 GENERATE
roundoverflow(k) <= roundoverflow(k-1) AND fracout(k+6);
END GENERATE;
expnode <= preexpnode(10 DOWNTO 1) + ("000000000" & roundoverflowff);
-- always round single output (round to nearest even)
roundbit <= (fracoutff(mantissa-24) AND fracoutff(mantissa-25)) OR
(NOT(fracoutff(mantissa-24)) AND fracoutff(mantissa-25) AND
(fracoutff(mantissa-26) OR fracoutff(mantissa-27) OR fracoutff(mantissa-28)));
mantissanode <= fracoutff(mantissa-2 DOWNTO mantissa-24) +
(zerovec(22 DOWNTO 1) & roundbit);
--ML March 8, 2011 consider expnode(10 DOWNTO 9) for zeroexpnode and maxexpnode calculation
zeroexpnode <= NOT(expnode(10) OR
expnode(9) OR expnode(8) OR expnode(7) OR
expnode(6) OR expnode(5) OR expnode(4) OR
expnode(3) OR expnode(2) OR expnode(1));
maxexpnode <= NOT(expnode(10)) AND NOT(expnode(9)) AND
expnode(8) AND expnode(7) AND expnode(6) AND expnode(5) AND
expnode(4) AND expnode(3) AND expnode(2) AND expnode(1);
-- all following '1' when true
-- 24/03/09 - zeroexpnode, maxexpnode also zeros mantissa (SRC bug)
zeromantissanode <= roundoverflowff OR zeroexpnode OR maxexpnode OR
expnode(9) OR expnode(10) OR
zipff(3+normspeed) OR satff(3+normspeed) OR
zeronumberff(1+normspeed);
maxmantissanode <= nanff(3+normspeed);
zeroexponentnode <= zeroexpnode OR expnode(10) OR
zipff(3+normspeed) OR zeronumberff(1+normspeed);
maxexponentnode <= maxexpnode OR (expnode(9) AND NOT(expnode(10))) OR
satff(3+normspeed) OR nanff(3+normspeed);
--*** OUTPUTS ***
cc(32) <= signff(2+2*normspeed);
cc(31 DOWNTO 24) <= exponentff;
cc(23 DOWNTO 1) <= mantissaff(23 DOWNTO 1);
--*** DEBUG ***
aaexp <= aa(10 DOWNTO 1);
aaman <= aa(mantissa+10 DOWNTO 11);
ccsgn <= signff(2+2*normspeed);
ccexp <= exponentff;
ccman <= mantissaff(23 DOWNTO 1);
END rtl;
|
LIBRARY ieee;
USE ieee.std_logic_1164.all;
USE ieee.std_logic_unsigned.all;
USE ieee.std_logic_arith.all;
--******************************************************************************
--*** ***
--*** ALTERA FLOATING POINT DATAPATH COMPILER ***
--*** ***
--*** HCC_CASTXTOF.VHD ***
--*** ***
--*** Function: Cast Internal Single to IEEE754 ***
--*** Single ***
--*** ***
--*** 14/07/07 ML ***
--*** ***
--*** (c) 2007 Altera Corporation ***
--*** ***
--*** Change History ***
--*** ***
--*** 17/04/09 - add NAN support, also fixed zero/infinity/nan mantissa ***
--*** 29/04/09 - zero output if mantissa in zero ***
--*** ***
--******************************************************************************
--******************************************************************************
--*** Latency: 5 + 2*(swSingleNormSpeed-1) ***
--******************************************************************************
ENTITY hcc_castxtof IS
GENERIC (
mantissa : positive := 32; -- 32 or 36
normspeed : positive := 2 -- 1 or 2
);
PORT (
sysclk : IN STD_LOGIC;
reset : IN STD_LOGIC;
enable : IN STD_LOGIC;
aa : IN STD_LOGIC_VECTOR (mantissa+10 DOWNTO 1);
aasat, aazip, aanan : IN STD_LOGIC;
cc : OUT STD_LOGIC_VECTOR (32 DOWNTO 1)
);
END hcc_castxtof;
ARCHITECTURE rtl OF hcc_castxtof IS
-- latency = 5 if normspeed = 1
-- latency = 7 if normspeed = 2 (extra pipe in normusgn3236 and output stage)
type exptopfftype IS ARRAY (3 DOWNTO 1) OF STD_LOGIC_VECTOR (10 DOWNTO 1);
type expbotfftype IS ARRAY (2 DOWNTO 1) OF STD_LOGIC_VECTOR (10 DOWNTO 1);
signal zerovec : STD_LOGIC_VECTOR (mantissa-1 DOWNTO 1);
signal count : STD_LOGIC_VECTOR (6 DOWNTO 1);
signal aaff : STD_LOGIC_VECTOR (mantissa+10 DOWNTO 1);
signal absnode, absroundnode, absff : STD_LOGIC_VECTOR (mantissa DOWNTO 1);
signal fracout, fracoutff : STD_LOGIC_VECTOR (mantissa DOWNTO 1);
signal exptopff : exptopfftype;
signal expbotff : expbotfftype;
signal roundoverflow : STD_LOGIC_VECTOR (24 DOWNTO 1);
signal roundoverflowff : STD_LOGIC;
signal satff, zipff, nanff : STD_LOGIC_VECTOR (3+normspeed DOWNTO 1);
signal signff : STD_LOGIC_VECTOR (2+2*normspeed DOWNTO 1);
signal zeronumber : STD_LOGIC_VECTOR (mantissa DOWNTO 1);
signal zeronumberff : STD_LOGIC_VECTOR (1+normspeed DOWNTO 1);
signal preexpnode, expnode : STD_LOGIC_VECTOR (10 DOWNTO 1);
signal exponentff : STD_LOGIC_VECTOR (8 DOWNTO 1);
signal mantissanode : STD_LOGIC_VECTOR (23 DOWNTO 1);
signal roundbit : STD_LOGIC;
signal mantissaroundff : STD_LOGIC_VECTOR (23 DOWNTO 1);
signal mantissaff : STD_LOGIC_VECTOR (23 DOWNTO 1);
signal zeroexpnode, maxexpnode : STD_LOGIC;
signal zeromantissanode, maxmantissanode : STD_LOGIC;
signal zeroexponentnode, maxexponentnode : STD_LOGIC;
signal zeromantissaff, maxmantissaff : STD_LOGIC;
signal zeroexponentff, maxexponentff : STD_LOGIC;
signal ccsgn : STD_LOGIC;
signal aaexp : STD_LOGIC_VECTOR (10 DOWNTO 1);
signal ccexp : STD_LOGIC_VECTOR (8 DOWNTO 1);
signal aaman : STD_LOGIC_VECTOR (mantissa DOWNTO 1);
signal ccman : STD_LOGIC_VECTOR (23 DOWNTO 1);
component hcc_normusgn3236 IS
GENERIC (
mantissa : positive := 32;
normspeed : positive := 1 -- 1 or 2
);
PORT (
sysclk : IN STD_LOGIC;
reset : IN STD_LOGIC;
enable : IN STD_LOGIC;
fracin : IN STD_LOGIC_VECTOR (mantissa DOWNTO 1);
countout : OUT STD_LOGIC_VECTOR (6 DOWNTO 1); -- 1 clock earlier than fracout
fracout : OUT STD_LOGIC_VECTOR (mantissa DOWNTO 1)
);
end component;
BEGIN
gza: FOR k IN 1 TO mantissa-1 GENERATE
zerovec(k) <= '0';
END GENERATE;
pclk: PROCESS (sysclk,reset)
BEGIN
IF (reset = '1') THEN
FOR k IN 1 TO mantissa+10 LOOP
aaff(k) <= '0';
END LOOP;
FOR k IN 1 TO mantissa LOOP
absff(k) <= '0';
END LOOP;
FOR k IN 1 TO mantissa LOOP
fracoutff(k) <= '0';
END LOOP;
FOR k IN 1 TO 3 LOOP
FOR j IN 1 TO 10 LOOP
exptopff(k)(j) <= '0';
END LOOP;
END LOOP;
roundoverflowff <= '0';
FOR k IN 1 TO 3+normspeed LOOP
satff(k) <= '0';
zipff(k) <= '0';
nanff(k) <= '0';
END LOOP;
FOR k IN 1 TO 2+2*normspeed LOOP
signff(k) <= '0';
END LOOP;
FOR k IN 1 TO 1+normspeed LOOP
zeronumberff(k) <= '0';
END LOOP;
ELSIF (rising_edge(sysclk)) THEN
IF (enable = '1') THEN
aaff <= aa;
absff <= absnode + absroundnode;
fracoutff <= fracout;
exptopff(1)(10 DOWNTO 1) <= aaff(10 DOWNTO 1);
-- add 4 because of maximum 4 bits wordgrowth in X mantissa
exptopff(2)(10 DOWNTO 1) <= exptopff(1)(10 DOWNTO 1) + "0000000100";
exptopff(3)(10 DOWNTO 1) <= exptopff(2)(10 DOWNTO 1) - ("0000" & count);
roundoverflowff <= roundoverflow(24);
satff(1) <= aasat;
FOR k IN 2 TO 3+normspeed LOOP
satff(k) <= satff(k-1);
END LOOP;
zipff(1) <= aazip;
FOR k IN 2 TO 3+normspeed LOOP
zipff(k) <= zipff(k-1);
END LOOP;
nanff(1) <= aanan;
FOR k IN 2 TO 3+normspeed LOOP
nanff(k) <= nanff(k-1);
END LOOP;
signff(1) <= aaff(mantissa+10);
FOR k IN 2 TO 2+2*normspeed LOOP
signff(k) <= signff(k-1);
END LOOP;
zeronumberff(1) <= NOT(zeronumber(mantissa));
FOR k IN 2 TO 1+normspeed LOOP
zeronumberff(k) <= zeronumberff(k-1);
END LOOP;
END IF;
END IF;
END PROCESS;
-- if normspeed = 1, latency = 5. if normspeed > 1, latency = 7
gsa: IF (normspeed = 1) GENERATE
pna: PROCESS (sysclk,reset)
BEGIN
IF (reset = '1') THEN
exponentff <= "00000000";
FOR k IN 1 TO 23 LOOP
mantissaff(k) <= '0';
END LOOP;
ELSIF (rising_edge(sysclk)) THEN
IF (enable = '1') THEN
FOR k IN 1 TO 8 LOOP
exponentff(k) <= (expnode(k) AND NOT(zeroexponentnode)) OR maxexponentnode;
END LOOP;
FOR k IN 1 TO 23 LOOP
mantissaff(k) <= (mantissanode(k) AND NOT(zeromantissanode)) OR maxmantissanode;
END LOOP;
END IF;
END IF;
END PROCESS;
preexpnode <= exptopff(3)(10 DOWNTO 1);
END GENERATE;
-- if normspeed = 1, latency = 5. if normspeed > 1, latency = 7
gsb: IF (normspeed = 2) GENERATE
pnb: PROCESS (sysclk,reset)
BEGIN
IF (reset = '1') THEN
expbotff(1)(10 DOWNTO 1) <= "0000000000";
expbotff(2)(10 DOWNTO 1) <= "0000000000";
exponentff <= "00000000";
FOR k IN 1 TO 23 LOOP
mantissaroundff(k) <= '0';
mantissaff(k) <= '0';
END LOOP;
zeromantissaff <= '0';
maxmantissaff <= '0';
zeroexponentff <= '0';
maxexponentff <= '0';
ELSIF (rising_edge(sysclk)) THEN
IF (enable = '1') THEN
expbotff(1)(10 DOWNTO 1) <= exptopff(3)(10 DOWNTO 1);
expbotff(2)(10 DOWNTO 1) <= expnode;
FOR k IN 1 TO 8 LOOP
exponentff(k) <= (expbotff(2)(k) AND NOT(zeroexponentff)) OR maxexponentff;
END LOOP;
mantissaroundff <= mantissanode;
FOR k IN 1 TO 23 LOOP
mantissaff(k) <= (mantissaroundff(k) AND NOT(zeromantissaff)) OR maxmantissaff;
END LOOP;
zeromantissaff <= zeromantissanode;
maxmantissaff <= maxmantissanode;
zeroexponentff <= zeroexponentnode;
maxexponentff <= maxexponentnode;
END IF;
END IF;
END PROCESS;
preexpnode <= expbotff(1)(10 DOWNTO 1);
END GENERATE;
-- round absolute value any way - need register on input of cntusgn
gaa: FOR k IN 1 TO mantissa GENERATE
absnode(k) <= aaff(k+10) XOR aaff(mantissa+10);
END GENERATE;
absroundnode <= zerovec(mantissa-1 DOWNTO 1) & aaff(mantissa+10);
zeronumber(1) <= absff(1);
gzma: FOR k IN 2 TO mantissa GENERATE
zeronumber(k) <= zeronumber(k-1) OR absff(k);
END GENERATE;
core: hcc_normusgn3236
GENERIC MAP (mantissa=>mantissa,normspeed=>normspeed)
PORT MAP (sysclk=>sysclk,reset=>reset,enable=>enable,
fracin=>absff(mantissa DOWNTO 1),countout=>count,
fracout=>fracout);
roundoverflow(1) <= fracout(7);
gna: FOR k IN 2 TO 24 GENERATE
roundoverflow(k) <= roundoverflow(k-1) AND fracout(k+6);
END GENERATE;
expnode <= preexpnode(10 DOWNTO 1) + ("000000000" & roundoverflowff);
-- always round single output (round to nearest even)
roundbit <= (fracoutff(mantissa-24) AND fracoutff(mantissa-25)) OR
(NOT(fracoutff(mantissa-24)) AND fracoutff(mantissa-25) AND
(fracoutff(mantissa-26) OR fracoutff(mantissa-27) OR fracoutff(mantissa-28)));
mantissanode <= fracoutff(mantissa-2 DOWNTO mantissa-24) +
(zerovec(22 DOWNTO 1) & roundbit);
--ML March 8, 2011 consider expnode(10 DOWNTO 9) for zeroexpnode and maxexpnode calculation
zeroexpnode <= NOT(expnode(10) OR
expnode(9) OR expnode(8) OR expnode(7) OR
expnode(6) OR expnode(5) OR expnode(4) OR
expnode(3) OR expnode(2) OR expnode(1));
maxexpnode <= NOT(expnode(10)) AND NOT(expnode(9)) AND
expnode(8) AND expnode(7) AND expnode(6) AND expnode(5) AND
expnode(4) AND expnode(3) AND expnode(2) AND expnode(1);
-- all following '1' when true
-- 24/03/09 - zeroexpnode, maxexpnode also zeros mantissa (SRC bug)
zeromantissanode <= roundoverflowff OR zeroexpnode OR maxexpnode OR
expnode(9) OR expnode(10) OR
zipff(3+normspeed) OR satff(3+normspeed) OR
zeronumberff(1+normspeed);
maxmantissanode <= nanff(3+normspeed);
zeroexponentnode <= zeroexpnode OR expnode(10) OR
zipff(3+normspeed) OR zeronumberff(1+normspeed);
maxexponentnode <= maxexpnode OR (expnode(9) AND NOT(expnode(10))) OR
satff(3+normspeed) OR nanff(3+normspeed);
--*** OUTPUTS ***
cc(32) <= signff(2+2*normspeed);
cc(31 DOWNTO 24) <= exponentff;
cc(23 DOWNTO 1) <= mantissaff(23 DOWNTO 1);
--*** DEBUG ***
aaexp <= aa(10 DOWNTO 1);
aaman <= aa(mantissa+10 DOWNTO 11);
ccsgn <= signff(2+2*normspeed);
ccexp <= exponentff;
ccman <= mantissaff(23 DOWNTO 1);
END rtl;
|
LIBRARY ieee;
USE ieee.std_logic_1164.all;
USE ieee.std_logic_unsigned.all;
USE ieee.std_logic_arith.all;
--******************************************************************************
--*** ***
--*** ALTERA FLOATING POINT DATAPATH COMPILER ***
--*** ***
--*** HCC_CASTXTOF.VHD ***
--*** ***
--*** Function: Cast Internal Single to IEEE754 ***
--*** Single ***
--*** ***
--*** 14/07/07 ML ***
--*** ***
--*** (c) 2007 Altera Corporation ***
--*** ***
--*** Change History ***
--*** ***
--*** 17/04/09 - add NAN support, also fixed zero/infinity/nan mantissa ***
--*** 29/04/09 - zero output if mantissa in zero ***
--*** ***
--******************************************************************************
--******************************************************************************
--*** Latency: 5 + 2*(swSingleNormSpeed-1) ***
--******************************************************************************
ENTITY hcc_castxtof IS
GENERIC (
mantissa : positive := 32; -- 32 or 36
normspeed : positive := 2 -- 1 or 2
);
PORT (
sysclk : IN STD_LOGIC;
reset : IN STD_LOGIC;
enable : IN STD_LOGIC;
aa : IN STD_LOGIC_VECTOR (mantissa+10 DOWNTO 1);
aasat, aazip, aanan : IN STD_LOGIC;
cc : OUT STD_LOGIC_VECTOR (32 DOWNTO 1)
);
END hcc_castxtof;
ARCHITECTURE rtl OF hcc_castxtof IS
-- latency = 5 if normspeed = 1
-- latency = 7 if normspeed = 2 (extra pipe in normusgn3236 and output stage)
type exptopfftype IS ARRAY (3 DOWNTO 1) OF STD_LOGIC_VECTOR (10 DOWNTO 1);
type expbotfftype IS ARRAY (2 DOWNTO 1) OF STD_LOGIC_VECTOR (10 DOWNTO 1);
signal zerovec : STD_LOGIC_VECTOR (mantissa-1 DOWNTO 1);
signal count : STD_LOGIC_VECTOR (6 DOWNTO 1);
signal aaff : STD_LOGIC_VECTOR (mantissa+10 DOWNTO 1);
signal absnode, absroundnode, absff : STD_LOGIC_VECTOR (mantissa DOWNTO 1);
signal fracout, fracoutff : STD_LOGIC_VECTOR (mantissa DOWNTO 1);
signal exptopff : exptopfftype;
signal expbotff : expbotfftype;
signal roundoverflow : STD_LOGIC_VECTOR (24 DOWNTO 1);
signal roundoverflowff : STD_LOGIC;
signal satff, zipff, nanff : STD_LOGIC_VECTOR (3+normspeed DOWNTO 1);
signal signff : STD_LOGIC_VECTOR (2+2*normspeed DOWNTO 1);
signal zeronumber : STD_LOGIC_VECTOR (mantissa DOWNTO 1);
signal zeronumberff : STD_LOGIC_VECTOR (1+normspeed DOWNTO 1);
signal preexpnode, expnode : STD_LOGIC_VECTOR (10 DOWNTO 1);
signal exponentff : STD_LOGIC_VECTOR (8 DOWNTO 1);
signal mantissanode : STD_LOGIC_VECTOR (23 DOWNTO 1);
signal roundbit : STD_LOGIC;
signal mantissaroundff : STD_LOGIC_VECTOR (23 DOWNTO 1);
signal mantissaff : STD_LOGIC_VECTOR (23 DOWNTO 1);
signal zeroexpnode, maxexpnode : STD_LOGIC;
signal zeromantissanode, maxmantissanode : STD_LOGIC;
signal zeroexponentnode, maxexponentnode : STD_LOGIC;
signal zeromantissaff, maxmantissaff : STD_LOGIC;
signal zeroexponentff, maxexponentff : STD_LOGIC;
signal ccsgn : STD_LOGIC;
signal aaexp : STD_LOGIC_VECTOR (10 DOWNTO 1);
signal ccexp : STD_LOGIC_VECTOR (8 DOWNTO 1);
signal aaman : STD_LOGIC_VECTOR (mantissa DOWNTO 1);
signal ccman : STD_LOGIC_VECTOR (23 DOWNTO 1);
component hcc_normusgn3236 IS
GENERIC (
mantissa : positive := 32;
normspeed : positive := 1 -- 1 or 2
);
PORT (
sysclk : IN STD_LOGIC;
reset : IN STD_LOGIC;
enable : IN STD_LOGIC;
fracin : IN STD_LOGIC_VECTOR (mantissa DOWNTO 1);
countout : OUT STD_LOGIC_VECTOR (6 DOWNTO 1); -- 1 clock earlier than fracout
fracout : OUT STD_LOGIC_VECTOR (mantissa DOWNTO 1)
);
end component;
BEGIN
gza: FOR k IN 1 TO mantissa-1 GENERATE
zerovec(k) <= '0';
END GENERATE;
pclk: PROCESS (sysclk,reset)
BEGIN
IF (reset = '1') THEN
FOR k IN 1 TO mantissa+10 LOOP
aaff(k) <= '0';
END LOOP;
FOR k IN 1 TO mantissa LOOP
absff(k) <= '0';
END LOOP;
FOR k IN 1 TO mantissa LOOP
fracoutff(k) <= '0';
END LOOP;
FOR k IN 1 TO 3 LOOP
FOR j IN 1 TO 10 LOOP
exptopff(k)(j) <= '0';
END LOOP;
END LOOP;
roundoverflowff <= '0';
FOR k IN 1 TO 3+normspeed LOOP
satff(k) <= '0';
zipff(k) <= '0';
nanff(k) <= '0';
END LOOP;
FOR k IN 1 TO 2+2*normspeed LOOP
signff(k) <= '0';
END LOOP;
FOR k IN 1 TO 1+normspeed LOOP
zeronumberff(k) <= '0';
END LOOP;
ELSIF (rising_edge(sysclk)) THEN
IF (enable = '1') THEN
aaff <= aa;
absff <= absnode + absroundnode;
fracoutff <= fracout;
exptopff(1)(10 DOWNTO 1) <= aaff(10 DOWNTO 1);
-- add 4 because of maximum 4 bits wordgrowth in X mantissa
exptopff(2)(10 DOWNTO 1) <= exptopff(1)(10 DOWNTO 1) + "0000000100";
exptopff(3)(10 DOWNTO 1) <= exptopff(2)(10 DOWNTO 1) - ("0000" & count);
roundoverflowff <= roundoverflow(24);
satff(1) <= aasat;
FOR k IN 2 TO 3+normspeed LOOP
satff(k) <= satff(k-1);
END LOOP;
zipff(1) <= aazip;
FOR k IN 2 TO 3+normspeed LOOP
zipff(k) <= zipff(k-1);
END LOOP;
nanff(1) <= aanan;
FOR k IN 2 TO 3+normspeed LOOP
nanff(k) <= nanff(k-1);
END LOOP;
signff(1) <= aaff(mantissa+10);
FOR k IN 2 TO 2+2*normspeed LOOP
signff(k) <= signff(k-1);
END LOOP;
zeronumberff(1) <= NOT(zeronumber(mantissa));
FOR k IN 2 TO 1+normspeed LOOP
zeronumberff(k) <= zeronumberff(k-1);
END LOOP;
END IF;
END IF;
END PROCESS;
-- if normspeed = 1, latency = 5. if normspeed > 1, latency = 7
gsa: IF (normspeed = 1) GENERATE
pna: PROCESS (sysclk,reset)
BEGIN
IF (reset = '1') THEN
exponentff <= "00000000";
FOR k IN 1 TO 23 LOOP
mantissaff(k) <= '0';
END LOOP;
ELSIF (rising_edge(sysclk)) THEN
IF (enable = '1') THEN
FOR k IN 1 TO 8 LOOP
exponentff(k) <= (expnode(k) AND NOT(zeroexponentnode)) OR maxexponentnode;
END LOOP;
FOR k IN 1 TO 23 LOOP
mantissaff(k) <= (mantissanode(k) AND NOT(zeromantissanode)) OR maxmantissanode;
END LOOP;
END IF;
END IF;
END PROCESS;
preexpnode <= exptopff(3)(10 DOWNTO 1);
END GENERATE;
-- if normspeed = 1, latency = 5. if normspeed > 1, latency = 7
gsb: IF (normspeed = 2) GENERATE
pnb: PROCESS (sysclk,reset)
BEGIN
IF (reset = '1') THEN
expbotff(1)(10 DOWNTO 1) <= "0000000000";
expbotff(2)(10 DOWNTO 1) <= "0000000000";
exponentff <= "00000000";
FOR k IN 1 TO 23 LOOP
mantissaroundff(k) <= '0';
mantissaff(k) <= '0';
END LOOP;
zeromantissaff <= '0';
maxmantissaff <= '0';
zeroexponentff <= '0';
maxexponentff <= '0';
ELSIF (rising_edge(sysclk)) THEN
IF (enable = '1') THEN
expbotff(1)(10 DOWNTO 1) <= exptopff(3)(10 DOWNTO 1);
expbotff(2)(10 DOWNTO 1) <= expnode;
FOR k IN 1 TO 8 LOOP
exponentff(k) <= (expbotff(2)(k) AND NOT(zeroexponentff)) OR maxexponentff;
END LOOP;
mantissaroundff <= mantissanode;
FOR k IN 1 TO 23 LOOP
mantissaff(k) <= (mantissaroundff(k) AND NOT(zeromantissaff)) OR maxmantissaff;
END LOOP;
zeromantissaff <= zeromantissanode;
maxmantissaff <= maxmantissanode;
zeroexponentff <= zeroexponentnode;
maxexponentff <= maxexponentnode;
END IF;
END IF;
END PROCESS;
preexpnode <= expbotff(1)(10 DOWNTO 1);
END GENERATE;
-- round absolute value any way - need register on input of cntusgn
gaa: FOR k IN 1 TO mantissa GENERATE
absnode(k) <= aaff(k+10) XOR aaff(mantissa+10);
END GENERATE;
absroundnode <= zerovec(mantissa-1 DOWNTO 1) & aaff(mantissa+10);
zeronumber(1) <= absff(1);
gzma: FOR k IN 2 TO mantissa GENERATE
zeronumber(k) <= zeronumber(k-1) OR absff(k);
END GENERATE;
core: hcc_normusgn3236
GENERIC MAP (mantissa=>mantissa,normspeed=>normspeed)
PORT MAP (sysclk=>sysclk,reset=>reset,enable=>enable,
fracin=>absff(mantissa DOWNTO 1),countout=>count,
fracout=>fracout);
roundoverflow(1) <= fracout(7);
gna: FOR k IN 2 TO 24 GENERATE
roundoverflow(k) <= roundoverflow(k-1) AND fracout(k+6);
END GENERATE;
expnode <= preexpnode(10 DOWNTO 1) + ("000000000" & roundoverflowff);
-- always round single output (round to nearest even)
roundbit <= (fracoutff(mantissa-24) AND fracoutff(mantissa-25)) OR
(NOT(fracoutff(mantissa-24)) AND fracoutff(mantissa-25) AND
(fracoutff(mantissa-26) OR fracoutff(mantissa-27) OR fracoutff(mantissa-28)));
mantissanode <= fracoutff(mantissa-2 DOWNTO mantissa-24) +
(zerovec(22 DOWNTO 1) & roundbit);
--ML March 8, 2011 consider expnode(10 DOWNTO 9) for zeroexpnode and maxexpnode calculation
zeroexpnode <= NOT(expnode(10) OR
expnode(9) OR expnode(8) OR expnode(7) OR
expnode(6) OR expnode(5) OR expnode(4) OR
expnode(3) OR expnode(2) OR expnode(1));
maxexpnode <= NOT(expnode(10)) AND NOT(expnode(9)) AND
expnode(8) AND expnode(7) AND expnode(6) AND expnode(5) AND
expnode(4) AND expnode(3) AND expnode(2) AND expnode(1);
-- all following '1' when true
-- 24/03/09 - zeroexpnode, maxexpnode also zeros mantissa (SRC bug)
zeromantissanode <= roundoverflowff OR zeroexpnode OR maxexpnode OR
expnode(9) OR expnode(10) OR
zipff(3+normspeed) OR satff(3+normspeed) OR
zeronumberff(1+normspeed);
maxmantissanode <= nanff(3+normspeed);
zeroexponentnode <= zeroexpnode OR expnode(10) OR
zipff(3+normspeed) OR zeronumberff(1+normspeed);
maxexponentnode <= maxexpnode OR (expnode(9) AND NOT(expnode(10))) OR
satff(3+normspeed) OR nanff(3+normspeed);
--*** OUTPUTS ***
cc(32) <= signff(2+2*normspeed);
cc(31 DOWNTO 24) <= exponentff;
cc(23 DOWNTO 1) <= mantissaff(23 DOWNTO 1);
--*** DEBUG ***
aaexp <= aa(10 DOWNTO 1);
aaman <= aa(mantissa+10 DOWNTO 11);
ccsgn <= signff(2+2*normspeed);
ccexp <= exponentff;
ccman <= mantissaff(23 DOWNTO 1);
END rtl;
|
LIBRARY ieee;
USE ieee.std_logic_1164.all;
USE ieee.std_logic_unsigned.all;
USE ieee.std_logic_arith.all;
--******************************************************************************
--*** ***
--*** ALTERA FLOATING POINT DATAPATH COMPILER ***
--*** ***
--*** HCC_CASTXTOF.VHD ***
--*** ***
--*** Function: Cast Internal Single to IEEE754 ***
--*** Single ***
--*** ***
--*** 14/07/07 ML ***
--*** ***
--*** (c) 2007 Altera Corporation ***
--*** ***
--*** Change History ***
--*** ***
--*** 17/04/09 - add NAN support, also fixed zero/infinity/nan mantissa ***
--*** 29/04/09 - zero output if mantissa in zero ***
--*** ***
--******************************************************************************
--******************************************************************************
--*** Latency: 5 + 2*(swSingleNormSpeed-1) ***
--******************************************************************************
ENTITY hcc_castxtof IS
GENERIC (
mantissa : positive := 32; -- 32 or 36
normspeed : positive := 2 -- 1 or 2
);
PORT (
sysclk : IN STD_LOGIC;
reset : IN STD_LOGIC;
enable : IN STD_LOGIC;
aa : IN STD_LOGIC_VECTOR (mantissa+10 DOWNTO 1);
aasat, aazip, aanan : IN STD_LOGIC;
cc : OUT STD_LOGIC_VECTOR (32 DOWNTO 1)
);
END hcc_castxtof;
ARCHITECTURE rtl OF hcc_castxtof IS
-- latency = 5 if normspeed = 1
-- latency = 7 if normspeed = 2 (extra pipe in normusgn3236 and output stage)
type exptopfftype IS ARRAY (3 DOWNTO 1) OF STD_LOGIC_VECTOR (10 DOWNTO 1);
type expbotfftype IS ARRAY (2 DOWNTO 1) OF STD_LOGIC_VECTOR (10 DOWNTO 1);
signal zerovec : STD_LOGIC_VECTOR (mantissa-1 DOWNTO 1);
signal count : STD_LOGIC_VECTOR (6 DOWNTO 1);
signal aaff : STD_LOGIC_VECTOR (mantissa+10 DOWNTO 1);
signal absnode, absroundnode, absff : STD_LOGIC_VECTOR (mantissa DOWNTO 1);
signal fracout, fracoutff : STD_LOGIC_VECTOR (mantissa DOWNTO 1);
signal exptopff : exptopfftype;
signal expbotff : expbotfftype;
signal roundoverflow : STD_LOGIC_VECTOR (24 DOWNTO 1);
signal roundoverflowff : STD_LOGIC;
signal satff, zipff, nanff : STD_LOGIC_VECTOR (3+normspeed DOWNTO 1);
signal signff : STD_LOGIC_VECTOR (2+2*normspeed DOWNTO 1);
signal zeronumber : STD_LOGIC_VECTOR (mantissa DOWNTO 1);
signal zeronumberff : STD_LOGIC_VECTOR (1+normspeed DOWNTO 1);
signal preexpnode, expnode : STD_LOGIC_VECTOR (10 DOWNTO 1);
signal exponentff : STD_LOGIC_VECTOR (8 DOWNTO 1);
signal mantissanode : STD_LOGIC_VECTOR (23 DOWNTO 1);
signal roundbit : STD_LOGIC;
signal mantissaroundff : STD_LOGIC_VECTOR (23 DOWNTO 1);
signal mantissaff : STD_LOGIC_VECTOR (23 DOWNTO 1);
signal zeroexpnode, maxexpnode : STD_LOGIC;
signal zeromantissanode, maxmantissanode : STD_LOGIC;
signal zeroexponentnode, maxexponentnode : STD_LOGIC;
signal zeromantissaff, maxmantissaff : STD_LOGIC;
signal zeroexponentff, maxexponentff : STD_LOGIC;
signal ccsgn : STD_LOGIC;
signal aaexp : STD_LOGIC_VECTOR (10 DOWNTO 1);
signal ccexp : STD_LOGIC_VECTOR (8 DOWNTO 1);
signal aaman : STD_LOGIC_VECTOR (mantissa DOWNTO 1);
signal ccman : STD_LOGIC_VECTOR (23 DOWNTO 1);
component hcc_normusgn3236 IS
GENERIC (
mantissa : positive := 32;
normspeed : positive := 1 -- 1 or 2
);
PORT (
sysclk : IN STD_LOGIC;
reset : IN STD_LOGIC;
enable : IN STD_LOGIC;
fracin : IN STD_LOGIC_VECTOR (mantissa DOWNTO 1);
countout : OUT STD_LOGIC_VECTOR (6 DOWNTO 1); -- 1 clock earlier than fracout
fracout : OUT STD_LOGIC_VECTOR (mantissa DOWNTO 1)
);
end component;
BEGIN
gza: FOR k IN 1 TO mantissa-1 GENERATE
zerovec(k) <= '0';
END GENERATE;
pclk: PROCESS (sysclk,reset)
BEGIN
IF (reset = '1') THEN
FOR k IN 1 TO mantissa+10 LOOP
aaff(k) <= '0';
END LOOP;
FOR k IN 1 TO mantissa LOOP
absff(k) <= '0';
END LOOP;
FOR k IN 1 TO mantissa LOOP
fracoutff(k) <= '0';
END LOOP;
FOR k IN 1 TO 3 LOOP
FOR j IN 1 TO 10 LOOP
exptopff(k)(j) <= '0';
END LOOP;
END LOOP;
roundoverflowff <= '0';
FOR k IN 1 TO 3+normspeed LOOP
satff(k) <= '0';
zipff(k) <= '0';
nanff(k) <= '0';
END LOOP;
FOR k IN 1 TO 2+2*normspeed LOOP
signff(k) <= '0';
END LOOP;
FOR k IN 1 TO 1+normspeed LOOP
zeronumberff(k) <= '0';
END LOOP;
ELSIF (rising_edge(sysclk)) THEN
IF (enable = '1') THEN
aaff <= aa;
absff <= absnode + absroundnode;
fracoutff <= fracout;
exptopff(1)(10 DOWNTO 1) <= aaff(10 DOWNTO 1);
-- add 4 because of maximum 4 bits wordgrowth in X mantissa
exptopff(2)(10 DOWNTO 1) <= exptopff(1)(10 DOWNTO 1) + "0000000100";
exptopff(3)(10 DOWNTO 1) <= exptopff(2)(10 DOWNTO 1) - ("0000" & count);
roundoverflowff <= roundoverflow(24);
satff(1) <= aasat;
FOR k IN 2 TO 3+normspeed LOOP
satff(k) <= satff(k-1);
END LOOP;
zipff(1) <= aazip;
FOR k IN 2 TO 3+normspeed LOOP
zipff(k) <= zipff(k-1);
END LOOP;
nanff(1) <= aanan;
FOR k IN 2 TO 3+normspeed LOOP
nanff(k) <= nanff(k-1);
END LOOP;
signff(1) <= aaff(mantissa+10);
FOR k IN 2 TO 2+2*normspeed LOOP
signff(k) <= signff(k-1);
END LOOP;
zeronumberff(1) <= NOT(zeronumber(mantissa));
FOR k IN 2 TO 1+normspeed LOOP
zeronumberff(k) <= zeronumberff(k-1);
END LOOP;
END IF;
END IF;
END PROCESS;
-- if normspeed = 1, latency = 5. if normspeed > 1, latency = 7
gsa: IF (normspeed = 1) GENERATE
pna: PROCESS (sysclk,reset)
BEGIN
IF (reset = '1') THEN
exponentff <= "00000000";
FOR k IN 1 TO 23 LOOP
mantissaff(k) <= '0';
END LOOP;
ELSIF (rising_edge(sysclk)) THEN
IF (enable = '1') THEN
FOR k IN 1 TO 8 LOOP
exponentff(k) <= (expnode(k) AND NOT(zeroexponentnode)) OR maxexponentnode;
END LOOP;
FOR k IN 1 TO 23 LOOP
mantissaff(k) <= (mantissanode(k) AND NOT(zeromantissanode)) OR maxmantissanode;
END LOOP;
END IF;
END IF;
END PROCESS;
preexpnode <= exptopff(3)(10 DOWNTO 1);
END GENERATE;
-- if normspeed = 1, latency = 5. if normspeed > 1, latency = 7
gsb: IF (normspeed = 2) GENERATE
pnb: PROCESS (sysclk,reset)
BEGIN
IF (reset = '1') THEN
expbotff(1)(10 DOWNTO 1) <= "0000000000";
expbotff(2)(10 DOWNTO 1) <= "0000000000";
exponentff <= "00000000";
FOR k IN 1 TO 23 LOOP
mantissaroundff(k) <= '0';
mantissaff(k) <= '0';
END LOOP;
zeromantissaff <= '0';
maxmantissaff <= '0';
zeroexponentff <= '0';
maxexponentff <= '0';
ELSIF (rising_edge(sysclk)) THEN
IF (enable = '1') THEN
expbotff(1)(10 DOWNTO 1) <= exptopff(3)(10 DOWNTO 1);
expbotff(2)(10 DOWNTO 1) <= expnode;
FOR k IN 1 TO 8 LOOP
exponentff(k) <= (expbotff(2)(k) AND NOT(zeroexponentff)) OR maxexponentff;
END LOOP;
mantissaroundff <= mantissanode;
FOR k IN 1 TO 23 LOOP
mantissaff(k) <= (mantissaroundff(k) AND NOT(zeromantissaff)) OR maxmantissaff;
END LOOP;
zeromantissaff <= zeromantissanode;
maxmantissaff <= maxmantissanode;
zeroexponentff <= zeroexponentnode;
maxexponentff <= maxexponentnode;
END IF;
END IF;
END PROCESS;
preexpnode <= expbotff(1)(10 DOWNTO 1);
END GENERATE;
-- round absolute value any way - need register on input of cntusgn
gaa: FOR k IN 1 TO mantissa GENERATE
absnode(k) <= aaff(k+10) XOR aaff(mantissa+10);
END GENERATE;
absroundnode <= zerovec(mantissa-1 DOWNTO 1) & aaff(mantissa+10);
zeronumber(1) <= absff(1);
gzma: FOR k IN 2 TO mantissa GENERATE
zeronumber(k) <= zeronumber(k-1) OR absff(k);
END GENERATE;
core: hcc_normusgn3236
GENERIC MAP (mantissa=>mantissa,normspeed=>normspeed)
PORT MAP (sysclk=>sysclk,reset=>reset,enable=>enable,
fracin=>absff(mantissa DOWNTO 1),countout=>count,
fracout=>fracout);
roundoverflow(1) <= fracout(7);
gna: FOR k IN 2 TO 24 GENERATE
roundoverflow(k) <= roundoverflow(k-1) AND fracout(k+6);
END GENERATE;
expnode <= preexpnode(10 DOWNTO 1) + ("000000000" & roundoverflowff);
-- always round single output (round to nearest even)
roundbit <= (fracoutff(mantissa-24) AND fracoutff(mantissa-25)) OR
(NOT(fracoutff(mantissa-24)) AND fracoutff(mantissa-25) AND
(fracoutff(mantissa-26) OR fracoutff(mantissa-27) OR fracoutff(mantissa-28)));
mantissanode <= fracoutff(mantissa-2 DOWNTO mantissa-24) +
(zerovec(22 DOWNTO 1) & roundbit);
--ML March 8, 2011 consider expnode(10 DOWNTO 9) for zeroexpnode and maxexpnode calculation
zeroexpnode <= NOT(expnode(10) OR
expnode(9) OR expnode(8) OR expnode(7) OR
expnode(6) OR expnode(5) OR expnode(4) OR
expnode(3) OR expnode(2) OR expnode(1));
maxexpnode <= NOT(expnode(10)) AND NOT(expnode(9)) AND
expnode(8) AND expnode(7) AND expnode(6) AND expnode(5) AND
expnode(4) AND expnode(3) AND expnode(2) AND expnode(1);
-- all following '1' when true
-- 24/03/09 - zeroexpnode, maxexpnode also zeros mantissa (SRC bug)
zeromantissanode <= roundoverflowff OR zeroexpnode OR maxexpnode OR
expnode(9) OR expnode(10) OR
zipff(3+normspeed) OR satff(3+normspeed) OR
zeronumberff(1+normspeed);
maxmantissanode <= nanff(3+normspeed);
zeroexponentnode <= zeroexpnode OR expnode(10) OR
zipff(3+normspeed) OR zeronumberff(1+normspeed);
maxexponentnode <= maxexpnode OR (expnode(9) AND NOT(expnode(10))) OR
satff(3+normspeed) OR nanff(3+normspeed);
--*** OUTPUTS ***
cc(32) <= signff(2+2*normspeed);
cc(31 DOWNTO 24) <= exponentff;
cc(23 DOWNTO 1) <= mantissaff(23 DOWNTO 1);
--*** DEBUG ***
aaexp <= aa(10 DOWNTO 1);
aaman <= aa(mantissa+10 DOWNTO 11);
ccsgn <= signff(2+2*normspeed);
ccexp <= exponentff;
ccman <= mantissaff(23 DOWNTO 1);
END rtl;
|
LIBRARY ieee;
USE ieee.std_logic_1164.all;
USE ieee.std_logic_unsigned.all;
USE ieee.std_logic_arith.all;
--******************************************************************************
--*** ***
--*** ALTERA FLOATING POINT DATAPATH COMPILER ***
--*** ***
--*** HCC_CASTXTOF.VHD ***
--*** ***
--*** Function: Cast Internal Single to IEEE754 ***
--*** Single ***
--*** ***
--*** 14/07/07 ML ***
--*** ***
--*** (c) 2007 Altera Corporation ***
--*** ***
--*** Change History ***
--*** ***
--*** 17/04/09 - add NAN support, also fixed zero/infinity/nan mantissa ***
--*** 29/04/09 - zero output if mantissa in zero ***
--*** ***
--******************************************************************************
--******************************************************************************
--*** Latency: 5 + 2*(swSingleNormSpeed-1) ***
--******************************************************************************
ENTITY hcc_castxtof IS
GENERIC (
mantissa : positive := 32; -- 32 or 36
normspeed : positive := 2 -- 1 or 2
);
PORT (
sysclk : IN STD_LOGIC;
reset : IN STD_LOGIC;
enable : IN STD_LOGIC;
aa : IN STD_LOGIC_VECTOR (mantissa+10 DOWNTO 1);
aasat, aazip, aanan : IN STD_LOGIC;
cc : OUT STD_LOGIC_VECTOR (32 DOWNTO 1)
);
END hcc_castxtof;
ARCHITECTURE rtl OF hcc_castxtof IS
-- latency = 5 if normspeed = 1
-- latency = 7 if normspeed = 2 (extra pipe in normusgn3236 and output stage)
type exptopfftype IS ARRAY (3 DOWNTO 1) OF STD_LOGIC_VECTOR (10 DOWNTO 1);
type expbotfftype IS ARRAY (2 DOWNTO 1) OF STD_LOGIC_VECTOR (10 DOWNTO 1);
signal zerovec : STD_LOGIC_VECTOR (mantissa-1 DOWNTO 1);
signal count : STD_LOGIC_VECTOR (6 DOWNTO 1);
signal aaff : STD_LOGIC_VECTOR (mantissa+10 DOWNTO 1);
signal absnode, absroundnode, absff : STD_LOGIC_VECTOR (mantissa DOWNTO 1);
signal fracout, fracoutff : STD_LOGIC_VECTOR (mantissa DOWNTO 1);
signal exptopff : exptopfftype;
signal expbotff : expbotfftype;
signal roundoverflow : STD_LOGIC_VECTOR (24 DOWNTO 1);
signal roundoverflowff : STD_LOGIC;
signal satff, zipff, nanff : STD_LOGIC_VECTOR (3+normspeed DOWNTO 1);
signal signff : STD_LOGIC_VECTOR (2+2*normspeed DOWNTO 1);
signal zeronumber : STD_LOGIC_VECTOR (mantissa DOWNTO 1);
signal zeronumberff : STD_LOGIC_VECTOR (1+normspeed DOWNTO 1);
signal preexpnode, expnode : STD_LOGIC_VECTOR (10 DOWNTO 1);
signal exponentff : STD_LOGIC_VECTOR (8 DOWNTO 1);
signal mantissanode : STD_LOGIC_VECTOR (23 DOWNTO 1);
signal roundbit : STD_LOGIC;
signal mantissaroundff : STD_LOGIC_VECTOR (23 DOWNTO 1);
signal mantissaff : STD_LOGIC_VECTOR (23 DOWNTO 1);
signal zeroexpnode, maxexpnode : STD_LOGIC;
signal zeromantissanode, maxmantissanode : STD_LOGIC;
signal zeroexponentnode, maxexponentnode : STD_LOGIC;
signal zeromantissaff, maxmantissaff : STD_LOGIC;
signal zeroexponentff, maxexponentff : STD_LOGIC;
signal ccsgn : STD_LOGIC;
signal aaexp : STD_LOGIC_VECTOR (10 DOWNTO 1);
signal ccexp : STD_LOGIC_VECTOR (8 DOWNTO 1);
signal aaman : STD_LOGIC_VECTOR (mantissa DOWNTO 1);
signal ccman : STD_LOGIC_VECTOR (23 DOWNTO 1);
component hcc_normusgn3236 IS
GENERIC (
mantissa : positive := 32;
normspeed : positive := 1 -- 1 or 2
);
PORT (
sysclk : IN STD_LOGIC;
reset : IN STD_LOGIC;
enable : IN STD_LOGIC;
fracin : IN STD_LOGIC_VECTOR (mantissa DOWNTO 1);
countout : OUT STD_LOGIC_VECTOR (6 DOWNTO 1); -- 1 clock earlier than fracout
fracout : OUT STD_LOGIC_VECTOR (mantissa DOWNTO 1)
);
end component;
BEGIN
gza: FOR k IN 1 TO mantissa-1 GENERATE
zerovec(k) <= '0';
END GENERATE;
pclk: PROCESS (sysclk,reset)
BEGIN
IF (reset = '1') THEN
FOR k IN 1 TO mantissa+10 LOOP
aaff(k) <= '0';
END LOOP;
FOR k IN 1 TO mantissa LOOP
absff(k) <= '0';
END LOOP;
FOR k IN 1 TO mantissa LOOP
fracoutff(k) <= '0';
END LOOP;
FOR k IN 1 TO 3 LOOP
FOR j IN 1 TO 10 LOOP
exptopff(k)(j) <= '0';
END LOOP;
END LOOP;
roundoverflowff <= '0';
FOR k IN 1 TO 3+normspeed LOOP
satff(k) <= '0';
zipff(k) <= '0';
nanff(k) <= '0';
END LOOP;
FOR k IN 1 TO 2+2*normspeed LOOP
signff(k) <= '0';
END LOOP;
FOR k IN 1 TO 1+normspeed LOOP
zeronumberff(k) <= '0';
END LOOP;
ELSIF (rising_edge(sysclk)) THEN
IF (enable = '1') THEN
aaff <= aa;
absff <= absnode + absroundnode;
fracoutff <= fracout;
exptopff(1)(10 DOWNTO 1) <= aaff(10 DOWNTO 1);
-- add 4 because of maximum 4 bits wordgrowth in X mantissa
exptopff(2)(10 DOWNTO 1) <= exptopff(1)(10 DOWNTO 1) + "0000000100";
exptopff(3)(10 DOWNTO 1) <= exptopff(2)(10 DOWNTO 1) - ("0000" & count);
roundoverflowff <= roundoverflow(24);
satff(1) <= aasat;
FOR k IN 2 TO 3+normspeed LOOP
satff(k) <= satff(k-1);
END LOOP;
zipff(1) <= aazip;
FOR k IN 2 TO 3+normspeed LOOP
zipff(k) <= zipff(k-1);
END LOOP;
nanff(1) <= aanan;
FOR k IN 2 TO 3+normspeed LOOP
nanff(k) <= nanff(k-1);
END LOOP;
signff(1) <= aaff(mantissa+10);
FOR k IN 2 TO 2+2*normspeed LOOP
signff(k) <= signff(k-1);
END LOOP;
zeronumberff(1) <= NOT(zeronumber(mantissa));
FOR k IN 2 TO 1+normspeed LOOP
zeronumberff(k) <= zeronumberff(k-1);
END LOOP;
END IF;
END IF;
END PROCESS;
-- if normspeed = 1, latency = 5. if normspeed > 1, latency = 7
gsa: IF (normspeed = 1) GENERATE
pna: PROCESS (sysclk,reset)
BEGIN
IF (reset = '1') THEN
exponentff <= "00000000";
FOR k IN 1 TO 23 LOOP
mantissaff(k) <= '0';
END LOOP;
ELSIF (rising_edge(sysclk)) THEN
IF (enable = '1') THEN
FOR k IN 1 TO 8 LOOP
exponentff(k) <= (expnode(k) AND NOT(zeroexponentnode)) OR maxexponentnode;
END LOOP;
FOR k IN 1 TO 23 LOOP
mantissaff(k) <= (mantissanode(k) AND NOT(zeromantissanode)) OR maxmantissanode;
END LOOP;
END IF;
END IF;
END PROCESS;
preexpnode <= exptopff(3)(10 DOWNTO 1);
END GENERATE;
-- if normspeed = 1, latency = 5. if normspeed > 1, latency = 7
gsb: IF (normspeed = 2) GENERATE
pnb: PROCESS (sysclk,reset)
BEGIN
IF (reset = '1') THEN
expbotff(1)(10 DOWNTO 1) <= "0000000000";
expbotff(2)(10 DOWNTO 1) <= "0000000000";
exponentff <= "00000000";
FOR k IN 1 TO 23 LOOP
mantissaroundff(k) <= '0';
mantissaff(k) <= '0';
END LOOP;
zeromantissaff <= '0';
maxmantissaff <= '0';
zeroexponentff <= '0';
maxexponentff <= '0';
ELSIF (rising_edge(sysclk)) THEN
IF (enable = '1') THEN
expbotff(1)(10 DOWNTO 1) <= exptopff(3)(10 DOWNTO 1);
expbotff(2)(10 DOWNTO 1) <= expnode;
FOR k IN 1 TO 8 LOOP
exponentff(k) <= (expbotff(2)(k) AND NOT(zeroexponentff)) OR maxexponentff;
END LOOP;
mantissaroundff <= mantissanode;
FOR k IN 1 TO 23 LOOP
mantissaff(k) <= (mantissaroundff(k) AND NOT(zeromantissaff)) OR maxmantissaff;
END LOOP;
zeromantissaff <= zeromantissanode;
maxmantissaff <= maxmantissanode;
zeroexponentff <= zeroexponentnode;
maxexponentff <= maxexponentnode;
END IF;
END IF;
END PROCESS;
preexpnode <= expbotff(1)(10 DOWNTO 1);
END GENERATE;
-- round absolute value any way - need register on input of cntusgn
gaa: FOR k IN 1 TO mantissa GENERATE
absnode(k) <= aaff(k+10) XOR aaff(mantissa+10);
END GENERATE;
absroundnode <= zerovec(mantissa-1 DOWNTO 1) & aaff(mantissa+10);
zeronumber(1) <= absff(1);
gzma: FOR k IN 2 TO mantissa GENERATE
zeronumber(k) <= zeronumber(k-1) OR absff(k);
END GENERATE;
core: hcc_normusgn3236
GENERIC MAP (mantissa=>mantissa,normspeed=>normspeed)
PORT MAP (sysclk=>sysclk,reset=>reset,enable=>enable,
fracin=>absff(mantissa DOWNTO 1),countout=>count,
fracout=>fracout);
roundoverflow(1) <= fracout(7);
gna: FOR k IN 2 TO 24 GENERATE
roundoverflow(k) <= roundoverflow(k-1) AND fracout(k+6);
END GENERATE;
expnode <= preexpnode(10 DOWNTO 1) + ("000000000" & roundoverflowff);
-- always round single output (round to nearest even)
roundbit <= (fracoutff(mantissa-24) AND fracoutff(mantissa-25)) OR
(NOT(fracoutff(mantissa-24)) AND fracoutff(mantissa-25) AND
(fracoutff(mantissa-26) OR fracoutff(mantissa-27) OR fracoutff(mantissa-28)));
mantissanode <= fracoutff(mantissa-2 DOWNTO mantissa-24) +
(zerovec(22 DOWNTO 1) & roundbit);
--ML March 8, 2011 consider expnode(10 DOWNTO 9) for zeroexpnode and maxexpnode calculation
zeroexpnode <= NOT(expnode(10) OR
expnode(9) OR expnode(8) OR expnode(7) OR
expnode(6) OR expnode(5) OR expnode(4) OR
expnode(3) OR expnode(2) OR expnode(1));
maxexpnode <= NOT(expnode(10)) AND NOT(expnode(9)) AND
expnode(8) AND expnode(7) AND expnode(6) AND expnode(5) AND
expnode(4) AND expnode(3) AND expnode(2) AND expnode(1);
-- all following '1' when true
-- 24/03/09 - zeroexpnode, maxexpnode also zeros mantissa (SRC bug)
zeromantissanode <= roundoverflowff OR zeroexpnode OR maxexpnode OR
expnode(9) OR expnode(10) OR
zipff(3+normspeed) OR satff(3+normspeed) OR
zeronumberff(1+normspeed);
maxmantissanode <= nanff(3+normspeed);
zeroexponentnode <= zeroexpnode OR expnode(10) OR
zipff(3+normspeed) OR zeronumberff(1+normspeed);
maxexponentnode <= maxexpnode OR (expnode(9) AND NOT(expnode(10))) OR
satff(3+normspeed) OR nanff(3+normspeed);
--*** OUTPUTS ***
cc(32) <= signff(2+2*normspeed);
cc(31 DOWNTO 24) <= exponentff;
cc(23 DOWNTO 1) <= mantissaff(23 DOWNTO 1);
--*** DEBUG ***
aaexp <= aa(10 DOWNTO 1);
aaman <= aa(mantissa+10 DOWNTO 11);
ccsgn <= signff(2+2*normspeed);
ccexp <= exponentff;
ccman <= mantissaff(23 DOWNTO 1);
END rtl;
|
LIBRARY ieee;
USE ieee.std_logic_1164.all;
USE ieee.std_logic_unsigned.all;
USE ieee.std_logic_arith.all;
--******************************************************************************
--*** ***
--*** ALTERA FLOATING POINT DATAPATH COMPILER ***
--*** ***
--*** HCC_CASTXTOF.VHD ***
--*** ***
--*** Function: Cast Internal Single to IEEE754 ***
--*** Single ***
--*** ***
--*** 14/07/07 ML ***
--*** ***
--*** (c) 2007 Altera Corporation ***
--*** ***
--*** Change History ***
--*** ***
--*** 17/04/09 - add NAN support, also fixed zero/infinity/nan mantissa ***
--*** 29/04/09 - zero output if mantissa in zero ***
--*** ***
--******************************************************************************
--******************************************************************************
--*** Latency: 5 + 2*(swSingleNormSpeed-1) ***
--******************************************************************************
ENTITY hcc_castxtof IS
GENERIC (
mantissa : positive := 32; -- 32 or 36
normspeed : positive := 2 -- 1 or 2
);
PORT (
sysclk : IN STD_LOGIC;
reset : IN STD_LOGIC;
enable : IN STD_LOGIC;
aa : IN STD_LOGIC_VECTOR (mantissa+10 DOWNTO 1);
aasat, aazip, aanan : IN STD_LOGIC;
cc : OUT STD_LOGIC_VECTOR (32 DOWNTO 1)
);
END hcc_castxtof;
ARCHITECTURE rtl OF hcc_castxtof IS
-- latency = 5 if normspeed = 1
-- latency = 7 if normspeed = 2 (extra pipe in normusgn3236 and output stage)
type exptopfftype IS ARRAY (3 DOWNTO 1) OF STD_LOGIC_VECTOR (10 DOWNTO 1);
type expbotfftype IS ARRAY (2 DOWNTO 1) OF STD_LOGIC_VECTOR (10 DOWNTO 1);
signal zerovec : STD_LOGIC_VECTOR (mantissa-1 DOWNTO 1);
signal count : STD_LOGIC_VECTOR (6 DOWNTO 1);
signal aaff : STD_LOGIC_VECTOR (mantissa+10 DOWNTO 1);
signal absnode, absroundnode, absff : STD_LOGIC_VECTOR (mantissa DOWNTO 1);
signal fracout, fracoutff : STD_LOGIC_VECTOR (mantissa DOWNTO 1);
signal exptopff : exptopfftype;
signal expbotff : expbotfftype;
signal roundoverflow : STD_LOGIC_VECTOR (24 DOWNTO 1);
signal roundoverflowff : STD_LOGIC;
signal satff, zipff, nanff : STD_LOGIC_VECTOR (3+normspeed DOWNTO 1);
signal signff : STD_LOGIC_VECTOR (2+2*normspeed DOWNTO 1);
signal zeronumber : STD_LOGIC_VECTOR (mantissa DOWNTO 1);
signal zeronumberff : STD_LOGIC_VECTOR (1+normspeed DOWNTO 1);
signal preexpnode, expnode : STD_LOGIC_VECTOR (10 DOWNTO 1);
signal exponentff : STD_LOGIC_VECTOR (8 DOWNTO 1);
signal mantissanode : STD_LOGIC_VECTOR (23 DOWNTO 1);
signal roundbit : STD_LOGIC;
signal mantissaroundff : STD_LOGIC_VECTOR (23 DOWNTO 1);
signal mantissaff : STD_LOGIC_VECTOR (23 DOWNTO 1);
signal zeroexpnode, maxexpnode : STD_LOGIC;
signal zeromantissanode, maxmantissanode : STD_LOGIC;
signal zeroexponentnode, maxexponentnode : STD_LOGIC;
signal zeromantissaff, maxmantissaff : STD_LOGIC;
signal zeroexponentff, maxexponentff : STD_LOGIC;
signal ccsgn : STD_LOGIC;
signal aaexp : STD_LOGIC_VECTOR (10 DOWNTO 1);
signal ccexp : STD_LOGIC_VECTOR (8 DOWNTO 1);
signal aaman : STD_LOGIC_VECTOR (mantissa DOWNTO 1);
signal ccman : STD_LOGIC_VECTOR (23 DOWNTO 1);
component hcc_normusgn3236 IS
GENERIC (
mantissa : positive := 32;
normspeed : positive := 1 -- 1 or 2
);
PORT (
sysclk : IN STD_LOGIC;
reset : IN STD_LOGIC;
enable : IN STD_LOGIC;
fracin : IN STD_LOGIC_VECTOR (mantissa DOWNTO 1);
countout : OUT STD_LOGIC_VECTOR (6 DOWNTO 1); -- 1 clock earlier than fracout
fracout : OUT STD_LOGIC_VECTOR (mantissa DOWNTO 1)
);
end component;
BEGIN
gza: FOR k IN 1 TO mantissa-1 GENERATE
zerovec(k) <= '0';
END GENERATE;
pclk: PROCESS (sysclk,reset)
BEGIN
IF (reset = '1') THEN
FOR k IN 1 TO mantissa+10 LOOP
aaff(k) <= '0';
END LOOP;
FOR k IN 1 TO mantissa LOOP
absff(k) <= '0';
END LOOP;
FOR k IN 1 TO mantissa LOOP
fracoutff(k) <= '0';
END LOOP;
FOR k IN 1 TO 3 LOOP
FOR j IN 1 TO 10 LOOP
exptopff(k)(j) <= '0';
END LOOP;
END LOOP;
roundoverflowff <= '0';
FOR k IN 1 TO 3+normspeed LOOP
satff(k) <= '0';
zipff(k) <= '0';
nanff(k) <= '0';
END LOOP;
FOR k IN 1 TO 2+2*normspeed LOOP
signff(k) <= '0';
END LOOP;
FOR k IN 1 TO 1+normspeed LOOP
zeronumberff(k) <= '0';
END LOOP;
ELSIF (rising_edge(sysclk)) THEN
IF (enable = '1') THEN
aaff <= aa;
absff <= absnode + absroundnode;
fracoutff <= fracout;
exptopff(1)(10 DOWNTO 1) <= aaff(10 DOWNTO 1);
-- add 4 because of maximum 4 bits wordgrowth in X mantissa
exptopff(2)(10 DOWNTO 1) <= exptopff(1)(10 DOWNTO 1) + "0000000100";
exptopff(3)(10 DOWNTO 1) <= exptopff(2)(10 DOWNTO 1) - ("0000" & count);
roundoverflowff <= roundoverflow(24);
satff(1) <= aasat;
FOR k IN 2 TO 3+normspeed LOOP
satff(k) <= satff(k-1);
END LOOP;
zipff(1) <= aazip;
FOR k IN 2 TO 3+normspeed LOOP
zipff(k) <= zipff(k-1);
END LOOP;
nanff(1) <= aanan;
FOR k IN 2 TO 3+normspeed LOOP
nanff(k) <= nanff(k-1);
END LOOP;
signff(1) <= aaff(mantissa+10);
FOR k IN 2 TO 2+2*normspeed LOOP
signff(k) <= signff(k-1);
END LOOP;
zeronumberff(1) <= NOT(zeronumber(mantissa));
FOR k IN 2 TO 1+normspeed LOOP
zeronumberff(k) <= zeronumberff(k-1);
END LOOP;
END IF;
END IF;
END PROCESS;
-- if normspeed = 1, latency = 5. if normspeed > 1, latency = 7
gsa: IF (normspeed = 1) GENERATE
pna: PROCESS (sysclk,reset)
BEGIN
IF (reset = '1') THEN
exponentff <= "00000000";
FOR k IN 1 TO 23 LOOP
mantissaff(k) <= '0';
END LOOP;
ELSIF (rising_edge(sysclk)) THEN
IF (enable = '1') THEN
FOR k IN 1 TO 8 LOOP
exponentff(k) <= (expnode(k) AND NOT(zeroexponentnode)) OR maxexponentnode;
END LOOP;
FOR k IN 1 TO 23 LOOP
mantissaff(k) <= (mantissanode(k) AND NOT(zeromantissanode)) OR maxmantissanode;
END LOOP;
END IF;
END IF;
END PROCESS;
preexpnode <= exptopff(3)(10 DOWNTO 1);
END GENERATE;
-- if normspeed = 1, latency = 5. if normspeed > 1, latency = 7
gsb: IF (normspeed = 2) GENERATE
pnb: PROCESS (sysclk,reset)
BEGIN
IF (reset = '1') THEN
expbotff(1)(10 DOWNTO 1) <= "0000000000";
expbotff(2)(10 DOWNTO 1) <= "0000000000";
exponentff <= "00000000";
FOR k IN 1 TO 23 LOOP
mantissaroundff(k) <= '0';
mantissaff(k) <= '0';
END LOOP;
zeromantissaff <= '0';
maxmantissaff <= '0';
zeroexponentff <= '0';
maxexponentff <= '0';
ELSIF (rising_edge(sysclk)) THEN
IF (enable = '1') THEN
expbotff(1)(10 DOWNTO 1) <= exptopff(3)(10 DOWNTO 1);
expbotff(2)(10 DOWNTO 1) <= expnode;
FOR k IN 1 TO 8 LOOP
exponentff(k) <= (expbotff(2)(k) AND NOT(zeroexponentff)) OR maxexponentff;
END LOOP;
mantissaroundff <= mantissanode;
FOR k IN 1 TO 23 LOOP
mantissaff(k) <= (mantissaroundff(k) AND NOT(zeromantissaff)) OR maxmantissaff;
END LOOP;
zeromantissaff <= zeromantissanode;
maxmantissaff <= maxmantissanode;
zeroexponentff <= zeroexponentnode;
maxexponentff <= maxexponentnode;
END IF;
END IF;
END PROCESS;
preexpnode <= expbotff(1)(10 DOWNTO 1);
END GENERATE;
-- round absolute value any way - need register on input of cntusgn
gaa: FOR k IN 1 TO mantissa GENERATE
absnode(k) <= aaff(k+10) XOR aaff(mantissa+10);
END GENERATE;
absroundnode <= zerovec(mantissa-1 DOWNTO 1) & aaff(mantissa+10);
zeronumber(1) <= absff(1);
gzma: FOR k IN 2 TO mantissa GENERATE
zeronumber(k) <= zeronumber(k-1) OR absff(k);
END GENERATE;
core: hcc_normusgn3236
GENERIC MAP (mantissa=>mantissa,normspeed=>normspeed)
PORT MAP (sysclk=>sysclk,reset=>reset,enable=>enable,
fracin=>absff(mantissa DOWNTO 1),countout=>count,
fracout=>fracout);
roundoverflow(1) <= fracout(7);
gna: FOR k IN 2 TO 24 GENERATE
roundoverflow(k) <= roundoverflow(k-1) AND fracout(k+6);
END GENERATE;
expnode <= preexpnode(10 DOWNTO 1) + ("000000000" & roundoverflowff);
-- always round single output (round to nearest even)
roundbit <= (fracoutff(mantissa-24) AND fracoutff(mantissa-25)) OR
(NOT(fracoutff(mantissa-24)) AND fracoutff(mantissa-25) AND
(fracoutff(mantissa-26) OR fracoutff(mantissa-27) OR fracoutff(mantissa-28)));
mantissanode <= fracoutff(mantissa-2 DOWNTO mantissa-24) +
(zerovec(22 DOWNTO 1) & roundbit);
--ML March 8, 2011 consider expnode(10 DOWNTO 9) for zeroexpnode and maxexpnode calculation
zeroexpnode <= NOT(expnode(10) OR
expnode(9) OR expnode(8) OR expnode(7) OR
expnode(6) OR expnode(5) OR expnode(4) OR
expnode(3) OR expnode(2) OR expnode(1));
maxexpnode <= NOT(expnode(10)) AND NOT(expnode(9)) AND
expnode(8) AND expnode(7) AND expnode(6) AND expnode(5) AND
expnode(4) AND expnode(3) AND expnode(2) AND expnode(1);
-- all following '1' when true
-- 24/03/09 - zeroexpnode, maxexpnode also zeros mantissa (SRC bug)
zeromantissanode <= roundoverflowff OR zeroexpnode OR maxexpnode OR
expnode(9) OR expnode(10) OR
zipff(3+normspeed) OR satff(3+normspeed) OR
zeronumberff(1+normspeed);
maxmantissanode <= nanff(3+normspeed);
zeroexponentnode <= zeroexpnode OR expnode(10) OR
zipff(3+normspeed) OR zeronumberff(1+normspeed);
maxexponentnode <= maxexpnode OR (expnode(9) AND NOT(expnode(10))) OR
satff(3+normspeed) OR nanff(3+normspeed);
--*** OUTPUTS ***
cc(32) <= signff(2+2*normspeed);
cc(31 DOWNTO 24) <= exponentff;
cc(23 DOWNTO 1) <= mantissaff(23 DOWNTO 1);
--*** DEBUG ***
aaexp <= aa(10 DOWNTO 1);
aaman <= aa(mantissa+10 DOWNTO 11);
ccsgn <= signff(2+2*normspeed);
ccexp <= exponentff;
ccman <= mantissaff(23 DOWNTO 1);
END rtl;
|
LIBRARY ieee;
USE ieee.std_logic_1164.all;
USE ieee.std_logic_unsigned.all;
USE ieee.std_logic_arith.all;
--******************************************************************************
--*** ***
--*** ALTERA FLOATING POINT DATAPATH COMPILER ***
--*** ***
--*** HCC_CASTXTOF.VHD ***
--*** ***
--*** Function: Cast Internal Single to IEEE754 ***
--*** Single ***
--*** ***
--*** 14/07/07 ML ***
--*** ***
--*** (c) 2007 Altera Corporation ***
--*** ***
--*** Change History ***
--*** ***
--*** 17/04/09 - add NAN support, also fixed zero/infinity/nan mantissa ***
--*** 29/04/09 - zero output if mantissa in zero ***
--*** ***
--******************************************************************************
--******************************************************************************
--*** Latency: 5 + 2*(swSingleNormSpeed-1) ***
--******************************************************************************
ENTITY hcc_castxtof IS
GENERIC (
mantissa : positive := 32; -- 32 or 36
normspeed : positive := 2 -- 1 or 2
);
PORT (
sysclk : IN STD_LOGIC;
reset : IN STD_LOGIC;
enable : IN STD_LOGIC;
aa : IN STD_LOGIC_VECTOR (mantissa+10 DOWNTO 1);
aasat, aazip, aanan : IN STD_LOGIC;
cc : OUT STD_LOGIC_VECTOR (32 DOWNTO 1)
);
END hcc_castxtof;
ARCHITECTURE rtl OF hcc_castxtof IS
-- latency = 5 if normspeed = 1
-- latency = 7 if normspeed = 2 (extra pipe in normusgn3236 and output stage)
type exptopfftype IS ARRAY (3 DOWNTO 1) OF STD_LOGIC_VECTOR (10 DOWNTO 1);
type expbotfftype IS ARRAY (2 DOWNTO 1) OF STD_LOGIC_VECTOR (10 DOWNTO 1);
signal zerovec : STD_LOGIC_VECTOR (mantissa-1 DOWNTO 1);
signal count : STD_LOGIC_VECTOR (6 DOWNTO 1);
signal aaff : STD_LOGIC_VECTOR (mantissa+10 DOWNTO 1);
signal absnode, absroundnode, absff : STD_LOGIC_VECTOR (mantissa DOWNTO 1);
signal fracout, fracoutff : STD_LOGIC_VECTOR (mantissa DOWNTO 1);
signal exptopff : exptopfftype;
signal expbotff : expbotfftype;
signal roundoverflow : STD_LOGIC_VECTOR (24 DOWNTO 1);
signal roundoverflowff : STD_LOGIC;
signal satff, zipff, nanff : STD_LOGIC_VECTOR (3+normspeed DOWNTO 1);
signal signff : STD_LOGIC_VECTOR (2+2*normspeed DOWNTO 1);
signal zeronumber : STD_LOGIC_VECTOR (mantissa DOWNTO 1);
signal zeronumberff : STD_LOGIC_VECTOR (1+normspeed DOWNTO 1);
signal preexpnode, expnode : STD_LOGIC_VECTOR (10 DOWNTO 1);
signal exponentff : STD_LOGIC_VECTOR (8 DOWNTO 1);
signal mantissanode : STD_LOGIC_VECTOR (23 DOWNTO 1);
signal roundbit : STD_LOGIC;
signal mantissaroundff : STD_LOGIC_VECTOR (23 DOWNTO 1);
signal mantissaff : STD_LOGIC_VECTOR (23 DOWNTO 1);
signal zeroexpnode, maxexpnode : STD_LOGIC;
signal zeromantissanode, maxmantissanode : STD_LOGIC;
signal zeroexponentnode, maxexponentnode : STD_LOGIC;
signal zeromantissaff, maxmantissaff : STD_LOGIC;
signal zeroexponentff, maxexponentff : STD_LOGIC;
signal ccsgn : STD_LOGIC;
signal aaexp : STD_LOGIC_VECTOR (10 DOWNTO 1);
signal ccexp : STD_LOGIC_VECTOR (8 DOWNTO 1);
signal aaman : STD_LOGIC_VECTOR (mantissa DOWNTO 1);
signal ccman : STD_LOGIC_VECTOR (23 DOWNTO 1);
component hcc_normusgn3236 IS
GENERIC (
mantissa : positive := 32;
normspeed : positive := 1 -- 1 or 2
);
PORT (
sysclk : IN STD_LOGIC;
reset : IN STD_LOGIC;
enable : IN STD_LOGIC;
fracin : IN STD_LOGIC_VECTOR (mantissa DOWNTO 1);
countout : OUT STD_LOGIC_VECTOR (6 DOWNTO 1); -- 1 clock earlier than fracout
fracout : OUT STD_LOGIC_VECTOR (mantissa DOWNTO 1)
);
end component;
BEGIN
gza: FOR k IN 1 TO mantissa-1 GENERATE
zerovec(k) <= '0';
END GENERATE;
pclk: PROCESS (sysclk,reset)
BEGIN
IF (reset = '1') THEN
FOR k IN 1 TO mantissa+10 LOOP
aaff(k) <= '0';
END LOOP;
FOR k IN 1 TO mantissa LOOP
absff(k) <= '0';
END LOOP;
FOR k IN 1 TO mantissa LOOP
fracoutff(k) <= '0';
END LOOP;
FOR k IN 1 TO 3 LOOP
FOR j IN 1 TO 10 LOOP
exptopff(k)(j) <= '0';
END LOOP;
END LOOP;
roundoverflowff <= '0';
FOR k IN 1 TO 3+normspeed LOOP
satff(k) <= '0';
zipff(k) <= '0';
nanff(k) <= '0';
END LOOP;
FOR k IN 1 TO 2+2*normspeed LOOP
signff(k) <= '0';
END LOOP;
FOR k IN 1 TO 1+normspeed LOOP
zeronumberff(k) <= '0';
END LOOP;
ELSIF (rising_edge(sysclk)) THEN
IF (enable = '1') THEN
aaff <= aa;
absff <= absnode + absroundnode;
fracoutff <= fracout;
exptopff(1)(10 DOWNTO 1) <= aaff(10 DOWNTO 1);
-- add 4 because of maximum 4 bits wordgrowth in X mantissa
exptopff(2)(10 DOWNTO 1) <= exptopff(1)(10 DOWNTO 1) + "0000000100";
exptopff(3)(10 DOWNTO 1) <= exptopff(2)(10 DOWNTO 1) - ("0000" & count);
roundoverflowff <= roundoverflow(24);
satff(1) <= aasat;
FOR k IN 2 TO 3+normspeed LOOP
satff(k) <= satff(k-1);
END LOOP;
zipff(1) <= aazip;
FOR k IN 2 TO 3+normspeed LOOP
zipff(k) <= zipff(k-1);
END LOOP;
nanff(1) <= aanan;
FOR k IN 2 TO 3+normspeed LOOP
nanff(k) <= nanff(k-1);
END LOOP;
signff(1) <= aaff(mantissa+10);
FOR k IN 2 TO 2+2*normspeed LOOP
signff(k) <= signff(k-1);
END LOOP;
zeronumberff(1) <= NOT(zeronumber(mantissa));
FOR k IN 2 TO 1+normspeed LOOP
zeronumberff(k) <= zeronumberff(k-1);
END LOOP;
END IF;
END IF;
END PROCESS;
-- if normspeed = 1, latency = 5. if normspeed > 1, latency = 7
gsa: IF (normspeed = 1) GENERATE
pna: PROCESS (sysclk,reset)
BEGIN
IF (reset = '1') THEN
exponentff <= "00000000";
FOR k IN 1 TO 23 LOOP
mantissaff(k) <= '0';
END LOOP;
ELSIF (rising_edge(sysclk)) THEN
IF (enable = '1') THEN
FOR k IN 1 TO 8 LOOP
exponentff(k) <= (expnode(k) AND NOT(zeroexponentnode)) OR maxexponentnode;
END LOOP;
FOR k IN 1 TO 23 LOOP
mantissaff(k) <= (mantissanode(k) AND NOT(zeromantissanode)) OR maxmantissanode;
END LOOP;
END IF;
END IF;
END PROCESS;
preexpnode <= exptopff(3)(10 DOWNTO 1);
END GENERATE;
-- if normspeed = 1, latency = 5. if normspeed > 1, latency = 7
gsb: IF (normspeed = 2) GENERATE
pnb: PROCESS (sysclk,reset)
BEGIN
IF (reset = '1') THEN
expbotff(1)(10 DOWNTO 1) <= "0000000000";
expbotff(2)(10 DOWNTO 1) <= "0000000000";
exponentff <= "00000000";
FOR k IN 1 TO 23 LOOP
mantissaroundff(k) <= '0';
mantissaff(k) <= '0';
END LOOP;
zeromantissaff <= '0';
maxmantissaff <= '0';
zeroexponentff <= '0';
maxexponentff <= '0';
ELSIF (rising_edge(sysclk)) THEN
IF (enable = '1') THEN
expbotff(1)(10 DOWNTO 1) <= exptopff(3)(10 DOWNTO 1);
expbotff(2)(10 DOWNTO 1) <= expnode;
FOR k IN 1 TO 8 LOOP
exponentff(k) <= (expbotff(2)(k) AND NOT(zeroexponentff)) OR maxexponentff;
END LOOP;
mantissaroundff <= mantissanode;
FOR k IN 1 TO 23 LOOP
mantissaff(k) <= (mantissaroundff(k) AND NOT(zeromantissaff)) OR maxmantissaff;
END LOOP;
zeromantissaff <= zeromantissanode;
maxmantissaff <= maxmantissanode;
zeroexponentff <= zeroexponentnode;
maxexponentff <= maxexponentnode;
END IF;
END IF;
END PROCESS;
preexpnode <= expbotff(1)(10 DOWNTO 1);
END GENERATE;
-- round absolute value any way - need register on input of cntusgn
gaa: FOR k IN 1 TO mantissa GENERATE
absnode(k) <= aaff(k+10) XOR aaff(mantissa+10);
END GENERATE;
absroundnode <= zerovec(mantissa-1 DOWNTO 1) & aaff(mantissa+10);
zeronumber(1) <= absff(1);
gzma: FOR k IN 2 TO mantissa GENERATE
zeronumber(k) <= zeronumber(k-1) OR absff(k);
END GENERATE;
core: hcc_normusgn3236
GENERIC MAP (mantissa=>mantissa,normspeed=>normspeed)
PORT MAP (sysclk=>sysclk,reset=>reset,enable=>enable,
fracin=>absff(mantissa DOWNTO 1),countout=>count,
fracout=>fracout);
roundoverflow(1) <= fracout(7);
gna: FOR k IN 2 TO 24 GENERATE
roundoverflow(k) <= roundoverflow(k-1) AND fracout(k+6);
END GENERATE;
expnode <= preexpnode(10 DOWNTO 1) + ("000000000" & roundoverflowff);
-- always round single output (round to nearest even)
roundbit <= (fracoutff(mantissa-24) AND fracoutff(mantissa-25)) OR
(NOT(fracoutff(mantissa-24)) AND fracoutff(mantissa-25) AND
(fracoutff(mantissa-26) OR fracoutff(mantissa-27) OR fracoutff(mantissa-28)));
mantissanode <= fracoutff(mantissa-2 DOWNTO mantissa-24) +
(zerovec(22 DOWNTO 1) & roundbit);
--ML March 8, 2011 consider expnode(10 DOWNTO 9) for zeroexpnode and maxexpnode calculation
zeroexpnode <= NOT(expnode(10) OR
expnode(9) OR expnode(8) OR expnode(7) OR
expnode(6) OR expnode(5) OR expnode(4) OR
expnode(3) OR expnode(2) OR expnode(1));
maxexpnode <= NOT(expnode(10)) AND NOT(expnode(9)) AND
expnode(8) AND expnode(7) AND expnode(6) AND expnode(5) AND
expnode(4) AND expnode(3) AND expnode(2) AND expnode(1);
-- all following '1' when true
-- 24/03/09 - zeroexpnode, maxexpnode also zeros mantissa (SRC bug)
zeromantissanode <= roundoverflowff OR zeroexpnode OR maxexpnode OR
expnode(9) OR expnode(10) OR
zipff(3+normspeed) OR satff(3+normspeed) OR
zeronumberff(1+normspeed);
maxmantissanode <= nanff(3+normspeed);
zeroexponentnode <= zeroexpnode OR expnode(10) OR
zipff(3+normspeed) OR zeronumberff(1+normspeed);
maxexponentnode <= maxexpnode OR (expnode(9) AND NOT(expnode(10))) OR
satff(3+normspeed) OR nanff(3+normspeed);
--*** OUTPUTS ***
cc(32) <= signff(2+2*normspeed);
cc(31 DOWNTO 24) <= exponentff;
cc(23 DOWNTO 1) <= mantissaff(23 DOWNTO 1);
--*** DEBUG ***
aaexp <= aa(10 DOWNTO 1);
aaman <= aa(mantissa+10 DOWNTO 11);
ccsgn <= signff(2+2*normspeed);
ccexp <= exponentff;
ccman <= mantissaff(23 DOWNTO 1);
END rtl;
|
LIBRARY ieee;
USE ieee.std_logic_1164.all;
USE ieee.std_logic_unsigned.all;
USE ieee.std_logic_arith.all;
--******************************************************************************
--*** ***
--*** ALTERA FLOATING POINT DATAPATH COMPILER ***
--*** ***
--*** HCC_CASTXTOF.VHD ***
--*** ***
--*** Function: Cast Internal Single to IEEE754 ***
--*** Single ***
--*** ***
--*** 14/07/07 ML ***
--*** ***
--*** (c) 2007 Altera Corporation ***
--*** ***
--*** Change History ***
--*** ***
--*** 17/04/09 - add NAN support, also fixed zero/infinity/nan mantissa ***
--*** 29/04/09 - zero output if mantissa in zero ***
--*** ***
--******************************************************************************
--******************************************************************************
--*** Latency: 5 + 2*(swSingleNormSpeed-1) ***
--******************************************************************************
ENTITY hcc_castxtof IS
GENERIC (
mantissa : positive := 32; -- 32 or 36
normspeed : positive := 2 -- 1 or 2
);
PORT (
sysclk : IN STD_LOGIC;
reset : IN STD_LOGIC;
enable : IN STD_LOGIC;
aa : IN STD_LOGIC_VECTOR (mantissa+10 DOWNTO 1);
aasat, aazip, aanan : IN STD_LOGIC;
cc : OUT STD_LOGIC_VECTOR (32 DOWNTO 1)
);
END hcc_castxtof;
ARCHITECTURE rtl OF hcc_castxtof IS
-- latency = 5 if normspeed = 1
-- latency = 7 if normspeed = 2 (extra pipe in normusgn3236 and output stage)
type exptopfftype IS ARRAY (3 DOWNTO 1) OF STD_LOGIC_VECTOR (10 DOWNTO 1);
type expbotfftype IS ARRAY (2 DOWNTO 1) OF STD_LOGIC_VECTOR (10 DOWNTO 1);
signal zerovec : STD_LOGIC_VECTOR (mantissa-1 DOWNTO 1);
signal count : STD_LOGIC_VECTOR (6 DOWNTO 1);
signal aaff : STD_LOGIC_VECTOR (mantissa+10 DOWNTO 1);
signal absnode, absroundnode, absff : STD_LOGIC_VECTOR (mantissa DOWNTO 1);
signal fracout, fracoutff : STD_LOGIC_VECTOR (mantissa DOWNTO 1);
signal exptopff : exptopfftype;
signal expbotff : expbotfftype;
signal roundoverflow : STD_LOGIC_VECTOR (24 DOWNTO 1);
signal roundoverflowff : STD_LOGIC;
signal satff, zipff, nanff : STD_LOGIC_VECTOR (3+normspeed DOWNTO 1);
signal signff : STD_LOGIC_VECTOR (2+2*normspeed DOWNTO 1);
signal zeronumber : STD_LOGIC_VECTOR (mantissa DOWNTO 1);
signal zeronumberff : STD_LOGIC_VECTOR (1+normspeed DOWNTO 1);
signal preexpnode, expnode : STD_LOGIC_VECTOR (10 DOWNTO 1);
signal exponentff : STD_LOGIC_VECTOR (8 DOWNTO 1);
signal mantissanode : STD_LOGIC_VECTOR (23 DOWNTO 1);
signal roundbit : STD_LOGIC;
signal mantissaroundff : STD_LOGIC_VECTOR (23 DOWNTO 1);
signal mantissaff : STD_LOGIC_VECTOR (23 DOWNTO 1);
signal zeroexpnode, maxexpnode : STD_LOGIC;
signal zeromantissanode, maxmantissanode : STD_LOGIC;
signal zeroexponentnode, maxexponentnode : STD_LOGIC;
signal zeromantissaff, maxmantissaff : STD_LOGIC;
signal zeroexponentff, maxexponentff : STD_LOGIC;
signal ccsgn : STD_LOGIC;
signal aaexp : STD_LOGIC_VECTOR (10 DOWNTO 1);
signal ccexp : STD_LOGIC_VECTOR (8 DOWNTO 1);
signal aaman : STD_LOGIC_VECTOR (mantissa DOWNTO 1);
signal ccman : STD_LOGIC_VECTOR (23 DOWNTO 1);
component hcc_normusgn3236 IS
GENERIC (
mantissa : positive := 32;
normspeed : positive := 1 -- 1 or 2
);
PORT (
sysclk : IN STD_LOGIC;
reset : IN STD_LOGIC;
enable : IN STD_LOGIC;
fracin : IN STD_LOGIC_VECTOR (mantissa DOWNTO 1);
countout : OUT STD_LOGIC_VECTOR (6 DOWNTO 1); -- 1 clock earlier than fracout
fracout : OUT STD_LOGIC_VECTOR (mantissa DOWNTO 1)
);
end component;
BEGIN
gza: FOR k IN 1 TO mantissa-1 GENERATE
zerovec(k) <= '0';
END GENERATE;
pclk: PROCESS (sysclk,reset)
BEGIN
IF (reset = '1') THEN
FOR k IN 1 TO mantissa+10 LOOP
aaff(k) <= '0';
END LOOP;
FOR k IN 1 TO mantissa LOOP
absff(k) <= '0';
END LOOP;
FOR k IN 1 TO mantissa LOOP
fracoutff(k) <= '0';
END LOOP;
FOR k IN 1 TO 3 LOOP
FOR j IN 1 TO 10 LOOP
exptopff(k)(j) <= '0';
END LOOP;
END LOOP;
roundoverflowff <= '0';
FOR k IN 1 TO 3+normspeed LOOP
satff(k) <= '0';
zipff(k) <= '0';
nanff(k) <= '0';
END LOOP;
FOR k IN 1 TO 2+2*normspeed LOOP
signff(k) <= '0';
END LOOP;
FOR k IN 1 TO 1+normspeed LOOP
zeronumberff(k) <= '0';
END LOOP;
ELSIF (rising_edge(sysclk)) THEN
IF (enable = '1') THEN
aaff <= aa;
absff <= absnode + absroundnode;
fracoutff <= fracout;
exptopff(1)(10 DOWNTO 1) <= aaff(10 DOWNTO 1);
-- add 4 because of maximum 4 bits wordgrowth in X mantissa
exptopff(2)(10 DOWNTO 1) <= exptopff(1)(10 DOWNTO 1) + "0000000100";
exptopff(3)(10 DOWNTO 1) <= exptopff(2)(10 DOWNTO 1) - ("0000" & count);
roundoverflowff <= roundoverflow(24);
satff(1) <= aasat;
FOR k IN 2 TO 3+normspeed LOOP
satff(k) <= satff(k-1);
END LOOP;
zipff(1) <= aazip;
FOR k IN 2 TO 3+normspeed LOOP
zipff(k) <= zipff(k-1);
END LOOP;
nanff(1) <= aanan;
FOR k IN 2 TO 3+normspeed LOOP
nanff(k) <= nanff(k-1);
END LOOP;
signff(1) <= aaff(mantissa+10);
FOR k IN 2 TO 2+2*normspeed LOOP
signff(k) <= signff(k-1);
END LOOP;
zeronumberff(1) <= NOT(zeronumber(mantissa));
FOR k IN 2 TO 1+normspeed LOOP
zeronumberff(k) <= zeronumberff(k-1);
END LOOP;
END IF;
END IF;
END PROCESS;
-- if normspeed = 1, latency = 5. if normspeed > 1, latency = 7
gsa: IF (normspeed = 1) GENERATE
pna: PROCESS (sysclk,reset)
BEGIN
IF (reset = '1') THEN
exponentff <= "00000000";
FOR k IN 1 TO 23 LOOP
mantissaff(k) <= '0';
END LOOP;
ELSIF (rising_edge(sysclk)) THEN
IF (enable = '1') THEN
FOR k IN 1 TO 8 LOOP
exponentff(k) <= (expnode(k) AND NOT(zeroexponentnode)) OR maxexponentnode;
END LOOP;
FOR k IN 1 TO 23 LOOP
mantissaff(k) <= (mantissanode(k) AND NOT(zeromantissanode)) OR maxmantissanode;
END LOOP;
END IF;
END IF;
END PROCESS;
preexpnode <= exptopff(3)(10 DOWNTO 1);
END GENERATE;
-- if normspeed = 1, latency = 5. if normspeed > 1, latency = 7
gsb: IF (normspeed = 2) GENERATE
pnb: PROCESS (sysclk,reset)
BEGIN
IF (reset = '1') THEN
expbotff(1)(10 DOWNTO 1) <= "0000000000";
expbotff(2)(10 DOWNTO 1) <= "0000000000";
exponentff <= "00000000";
FOR k IN 1 TO 23 LOOP
mantissaroundff(k) <= '0';
mantissaff(k) <= '0';
END LOOP;
zeromantissaff <= '0';
maxmantissaff <= '0';
zeroexponentff <= '0';
maxexponentff <= '0';
ELSIF (rising_edge(sysclk)) THEN
IF (enable = '1') THEN
expbotff(1)(10 DOWNTO 1) <= exptopff(3)(10 DOWNTO 1);
expbotff(2)(10 DOWNTO 1) <= expnode;
FOR k IN 1 TO 8 LOOP
exponentff(k) <= (expbotff(2)(k) AND NOT(zeroexponentff)) OR maxexponentff;
END LOOP;
mantissaroundff <= mantissanode;
FOR k IN 1 TO 23 LOOP
mantissaff(k) <= (mantissaroundff(k) AND NOT(zeromantissaff)) OR maxmantissaff;
END LOOP;
zeromantissaff <= zeromantissanode;
maxmantissaff <= maxmantissanode;
zeroexponentff <= zeroexponentnode;
maxexponentff <= maxexponentnode;
END IF;
END IF;
END PROCESS;
preexpnode <= expbotff(1)(10 DOWNTO 1);
END GENERATE;
-- round absolute value any way - need register on input of cntusgn
gaa: FOR k IN 1 TO mantissa GENERATE
absnode(k) <= aaff(k+10) XOR aaff(mantissa+10);
END GENERATE;
absroundnode <= zerovec(mantissa-1 DOWNTO 1) & aaff(mantissa+10);
zeronumber(1) <= absff(1);
gzma: FOR k IN 2 TO mantissa GENERATE
zeronumber(k) <= zeronumber(k-1) OR absff(k);
END GENERATE;
core: hcc_normusgn3236
GENERIC MAP (mantissa=>mantissa,normspeed=>normspeed)
PORT MAP (sysclk=>sysclk,reset=>reset,enable=>enable,
fracin=>absff(mantissa DOWNTO 1),countout=>count,
fracout=>fracout);
roundoverflow(1) <= fracout(7);
gna: FOR k IN 2 TO 24 GENERATE
roundoverflow(k) <= roundoverflow(k-1) AND fracout(k+6);
END GENERATE;
expnode <= preexpnode(10 DOWNTO 1) + ("000000000" & roundoverflowff);
-- always round single output (round to nearest even)
roundbit <= (fracoutff(mantissa-24) AND fracoutff(mantissa-25)) OR
(NOT(fracoutff(mantissa-24)) AND fracoutff(mantissa-25) AND
(fracoutff(mantissa-26) OR fracoutff(mantissa-27) OR fracoutff(mantissa-28)));
mantissanode <= fracoutff(mantissa-2 DOWNTO mantissa-24) +
(zerovec(22 DOWNTO 1) & roundbit);
--ML March 8, 2011 consider expnode(10 DOWNTO 9) for zeroexpnode and maxexpnode calculation
zeroexpnode <= NOT(expnode(10) OR
expnode(9) OR expnode(8) OR expnode(7) OR
expnode(6) OR expnode(5) OR expnode(4) OR
expnode(3) OR expnode(2) OR expnode(1));
maxexpnode <= NOT(expnode(10)) AND NOT(expnode(9)) AND
expnode(8) AND expnode(7) AND expnode(6) AND expnode(5) AND
expnode(4) AND expnode(3) AND expnode(2) AND expnode(1);
-- all following '1' when true
-- 24/03/09 - zeroexpnode, maxexpnode also zeros mantissa (SRC bug)
zeromantissanode <= roundoverflowff OR zeroexpnode OR maxexpnode OR
expnode(9) OR expnode(10) OR
zipff(3+normspeed) OR satff(3+normspeed) OR
zeronumberff(1+normspeed);
maxmantissanode <= nanff(3+normspeed);
zeroexponentnode <= zeroexpnode OR expnode(10) OR
zipff(3+normspeed) OR zeronumberff(1+normspeed);
maxexponentnode <= maxexpnode OR (expnode(9) AND NOT(expnode(10))) OR
satff(3+normspeed) OR nanff(3+normspeed);
--*** OUTPUTS ***
cc(32) <= signff(2+2*normspeed);
cc(31 DOWNTO 24) <= exponentff;
cc(23 DOWNTO 1) <= mantissaff(23 DOWNTO 1);
--*** DEBUG ***
aaexp <= aa(10 DOWNTO 1);
aaman <= aa(mantissa+10 DOWNTO 11);
ccsgn <= signff(2+2*normspeed);
ccexp <= exponentff;
ccman <= mantissaff(23 DOWNTO 1);
END rtl;
|
LIBRARY ieee;
USE ieee.std_logic_1164.all;
USE ieee.std_logic_unsigned.all;
USE ieee.std_logic_arith.all;
--******************************************************************************
--*** ***
--*** ALTERA FLOATING POINT DATAPATH COMPILER ***
--*** ***
--*** HCC_CASTXTOF.VHD ***
--*** ***
--*** Function: Cast Internal Single to IEEE754 ***
--*** Single ***
--*** ***
--*** 14/07/07 ML ***
--*** ***
--*** (c) 2007 Altera Corporation ***
--*** ***
--*** Change History ***
--*** ***
--*** 17/04/09 - add NAN support, also fixed zero/infinity/nan mantissa ***
--*** 29/04/09 - zero output if mantissa in zero ***
--*** ***
--******************************************************************************
--******************************************************************************
--*** Latency: 5 + 2*(swSingleNormSpeed-1) ***
--******************************************************************************
ENTITY hcc_castxtof IS
GENERIC (
mantissa : positive := 32; -- 32 or 36
normspeed : positive := 2 -- 1 or 2
);
PORT (
sysclk : IN STD_LOGIC;
reset : IN STD_LOGIC;
enable : IN STD_LOGIC;
aa : IN STD_LOGIC_VECTOR (mantissa+10 DOWNTO 1);
aasat, aazip, aanan : IN STD_LOGIC;
cc : OUT STD_LOGIC_VECTOR (32 DOWNTO 1)
);
END hcc_castxtof;
ARCHITECTURE rtl OF hcc_castxtof IS
-- latency = 5 if normspeed = 1
-- latency = 7 if normspeed = 2 (extra pipe in normusgn3236 and output stage)
type exptopfftype IS ARRAY (3 DOWNTO 1) OF STD_LOGIC_VECTOR (10 DOWNTO 1);
type expbotfftype IS ARRAY (2 DOWNTO 1) OF STD_LOGIC_VECTOR (10 DOWNTO 1);
signal zerovec : STD_LOGIC_VECTOR (mantissa-1 DOWNTO 1);
signal count : STD_LOGIC_VECTOR (6 DOWNTO 1);
signal aaff : STD_LOGIC_VECTOR (mantissa+10 DOWNTO 1);
signal absnode, absroundnode, absff : STD_LOGIC_VECTOR (mantissa DOWNTO 1);
signal fracout, fracoutff : STD_LOGIC_VECTOR (mantissa DOWNTO 1);
signal exptopff : exptopfftype;
signal expbotff : expbotfftype;
signal roundoverflow : STD_LOGIC_VECTOR (24 DOWNTO 1);
signal roundoverflowff : STD_LOGIC;
signal satff, zipff, nanff : STD_LOGIC_VECTOR (3+normspeed DOWNTO 1);
signal signff : STD_LOGIC_VECTOR (2+2*normspeed DOWNTO 1);
signal zeronumber : STD_LOGIC_VECTOR (mantissa DOWNTO 1);
signal zeronumberff : STD_LOGIC_VECTOR (1+normspeed DOWNTO 1);
signal preexpnode, expnode : STD_LOGIC_VECTOR (10 DOWNTO 1);
signal exponentff : STD_LOGIC_VECTOR (8 DOWNTO 1);
signal mantissanode : STD_LOGIC_VECTOR (23 DOWNTO 1);
signal roundbit : STD_LOGIC;
signal mantissaroundff : STD_LOGIC_VECTOR (23 DOWNTO 1);
signal mantissaff : STD_LOGIC_VECTOR (23 DOWNTO 1);
signal zeroexpnode, maxexpnode : STD_LOGIC;
signal zeromantissanode, maxmantissanode : STD_LOGIC;
signal zeroexponentnode, maxexponentnode : STD_LOGIC;
signal zeromantissaff, maxmantissaff : STD_LOGIC;
signal zeroexponentff, maxexponentff : STD_LOGIC;
signal ccsgn : STD_LOGIC;
signal aaexp : STD_LOGIC_VECTOR (10 DOWNTO 1);
signal ccexp : STD_LOGIC_VECTOR (8 DOWNTO 1);
signal aaman : STD_LOGIC_VECTOR (mantissa DOWNTO 1);
signal ccman : STD_LOGIC_VECTOR (23 DOWNTO 1);
component hcc_normusgn3236 IS
GENERIC (
mantissa : positive := 32;
normspeed : positive := 1 -- 1 or 2
);
PORT (
sysclk : IN STD_LOGIC;
reset : IN STD_LOGIC;
enable : IN STD_LOGIC;
fracin : IN STD_LOGIC_VECTOR (mantissa DOWNTO 1);
countout : OUT STD_LOGIC_VECTOR (6 DOWNTO 1); -- 1 clock earlier than fracout
fracout : OUT STD_LOGIC_VECTOR (mantissa DOWNTO 1)
);
end component;
BEGIN
gza: FOR k IN 1 TO mantissa-1 GENERATE
zerovec(k) <= '0';
END GENERATE;
pclk: PROCESS (sysclk,reset)
BEGIN
IF (reset = '1') THEN
FOR k IN 1 TO mantissa+10 LOOP
aaff(k) <= '0';
END LOOP;
FOR k IN 1 TO mantissa LOOP
absff(k) <= '0';
END LOOP;
FOR k IN 1 TO mantissa LOOP
fracoutff(k) <= '0';
END LOOP;
FOR k IN 1 TO 3 LOOP
FOR j IN 1 TO 10 LOOP
exptopff(k)(j) <= '0';
END LOOP;
END LOOP;
roundoverflowff <= '0';
FOR k IN 1 TO 3+normspeed LOOP
satff(k) <= '0';
zipff(k) <= '0';
nanff(k) <= '0';
END LOOP;
FOR k IN 1 TO 2+2*normspeed LOOP
signff(k) <= '0';
END LOOP;
FOR k IN 1 TO 1+normspeed LOOP
zeronumberff(k) <= '0';
END LOOP;
ELSIF (rising_edge(sysclk)) THEN
IF (enable = '1') THEN
aaff <= aa;
absff <= absnode + absroundnode;
fracoutff <= fracout;
exptopff(1)(10 DOWNTO 1) <= aaff(10 DOWNTO 1);
-- add 4 because of maximum 4 bits wordgrowth in X mantissa
exptopff(2)(10 DOWNTO 1) <= exptopff(1)(10 DOWNTO 1) + "0000000100";
exptopff(3)(10 DOWNTO 1) <= exptopff(2)(10 DOWNTO 1) - ("0000" & count);
roundoverflowff <= roundoverflow(24);
satff(1) <= aasat;
FOR k IN 2 TO 3+normspeed LOOP
satff(k) <= satff(k-1);
END LOOP;
zipff(1) <= aazip;
FOR k IN 2 TO 3+normspeed LOOP
zipff(k) <= zipff(k-1);
END LOOP;
nanff(1) <= aanan;
FOR k IN 2 TO 3+normspeed LOOP
nanff(k) <= nanff(k-1);
END LOOP;
signff(1) <= aaff(mantissa+10);
FOR k IN 2 TO 2+2*normspeed LOOP
signff(k) <= signff(k-1);
END LOOP;
zeronumberff(1) <= NOT(zeronumber(mantissa));
FOR k IN 2 TO 1+normspeed LOOP
zeronumberff(k) <= zeronumberff(k-1);
END LOOP;
END IF;
END IF;
END PROCESS;
-- if normspeed = 1, latency = 5. if normspeed > 1, latency = 7
gsa: IF (normspeed = 1) GENERATE
pna: PROCESS (sysclk,reset)
BEGIN
IF (reset = '1') THEN
exponentff <= "00000000";
FOR k IN 1 TO 23 LOOP
mantissaff(k) <= '0';
END LOOP;
ELSIF (rising_edge(sysclk)) THEN
IF (enable = '1') THEN
FOR k IN 1 TO 8 LOOP
exponentff(k) <= (expnode(k) AND NOT(zeroexponentnode)) OR maxexponentnode;
END LOOP;
FOR k IN 1 TO 23 LOOP
mantissaff(k) <= (mantissanode(k) AND NOT(zeromantissanode)) OR maxmantissanode;
END LOOP;
END IF;
END IF;
END PROCESS;
preexpnode <= exptopff(3)(10 DOWNTO 1);
END GENERATE;
-- if normspeed = 1, latency = 5. if normspeed > 1, latency = 7
gsb: IF (normspeed = 2) GENERATE
pnb: PROCESS (sysclk,reset)
BEGIN
IF (reset = '1') THEN
expbotff(1)(10 DOWNTO 1) <= "0000000000";
expbotff(2)(10 DOWNTO 1) <= "0000000000";
exponentff <= "00000000";
FOR k IN 1 TO 23 LOOP
mantissaroundff(k) <= '0';
mantissaff(k) <= '0';
END LOOP;
zeromantissaff <= '0';
maxmantissaff <= '0';
zeroexponentff <= '0';
maxexponentff <= '0';
ELSIF (rising_edge(sysclk)) THEN
IF (enable = '1') THEN
expbotff(1)(10 DOWNTO 1) <= exptopff(3)(10 DOWNTO 1);
expbotff(2)(10 DOWNTO 1) <= expnode;
FOR k IN 1 TO 8 LOOP
exponentff(k) <= (expbotff(2)(k) AND NOT(zeroexponentff)) OR maxexponentff;
END LOOP;
mantissaroundff <= mantissanode;
FOR k IN 1 TO 23 LOOP
mantissaff(k) <= (mantissaroundff(k) AND NOT(zeromantissaff)) OR maxmantissaff;
END LOOP;
zeromantissaff <= zeromantissanode;
maxmantissaff <= maxmantissanode;
zeroexponentff <= zeroexponentnode;
maxexponentff <= maxexponentnode;
END IF;
END IF;
END PROCESS;
preexpnode <= expbotff(1)(10 DOWNTO 1);
END GENERATE;
-- round absolute value any way - need register on input of cntusgn
gaa: FOR k IN 1 TO mantissa GENERATE
absnode(k) <= aaff(k+10) XOR aaff(mantissa+10);
END GENERATE;
absroundnode <= zerovec(mantissa-1 DOWNTO 1) & aaff(mantissa+10);
zeronumber(1) <= absff(1);
gzma: FOR k IN 2 TO mantissa GENERATE
zeronumber(k) <= zeronumber(k-1) OR absff(k);
END GENERATE;
core: hcc_normusgn3236
GENERIC MAP (mantissa=>mantissa,normspeed=>normspeed)
PORT MAP (sysclk=>sysclk,reset=>reset,enable=>enable,
fracin=>absff(mantissa DOWNTO 1),countout=>count,
fracout=>fracout);
roundoverflow(1) <= fracout(7);
gna: FOR k IN 2 TO 24 GENERATE
roundoverflow(k) <= roundoverflow(k-1) AND fracout(k+6);
END GENERATE;
expnode <= preexpnode(10 DOWNTO 1) + ("000000000" & roundoverflowff);
-- always round single output (round to nearest even)
roundbit <= (fracoutff(mantissa-24) AND fracoutff(mantissa-25)) OR
(NOT(fracoutff(mantissa-24)) AND fracoutff(mantissa-25) AND
(fracoutff(mantissa-26) OR fracoutff(mantissa-27) OR fracoutff(mantissa-28)));
mantissanode <= fracoutff(mantissa-2 DOWNTO mantissa-24) +
(zerovec(22 DOWNTO 1) & roundbit);
--ML March 8, 2011 consider expnode(10 DOWNTO 9) for zeroexpnode and maxexpnode calculation
zeroexpnode <= NOT(expnode(10) OR
expnode(9) OR expnode(8) OR expnode(7) OR
expnode(6) OR expnode(5) OR expnode(4) OR
expnode(3) OR expnode(2) OR expnode(1));
maxexpnode <= NOT(expnode(10)) AND NOT(expnode(9)) AND
expnode(8) AND expnode(7) AND expnode(6) AND expnode(5) AND
expnode(4) AND expnode(3) AND expnode(2) AND expnode(1);
-- all following '1' when true
-- 24/03/09 - zeroexpnode, maxexpnode also zeros mantissa (SRC bug)
zeromantissanode <= roundoverflowff OR zeroexpnode OR maxexpnode OR
expnode(9) OR expnode(10) OR
zipff(3+normspeed) OR satff(3+normspeed) OR
zeronumberff(1+normspeed);
maxmantissanode <= nanff(3+normspeed);
zeroexponentnode <= zeroexpnode OR expnode(10) OR
zipff(3+normspeed) OR zeronumberff(1+normspeed);
maxexponentnode <= maxexpnode OR (expnode(9) AND NOT(expnode(10))) OR
satff(3+normspeed) OR nanff(3+normspeed);
--*** OUTPUTS ***
cc(32) <= signff(2+2*normspeed);
cc(31 DOWNTO 24) <= exponentff;
cc(23 DOWNTO 1) <= mantissaff(23 DOWNTO 1);
--*** DEBUG ***
aaexp <= aa(10 DOWNTO 1);
aaman <= aa(mantissa+10 DOWNTO 11);
ccsgn <= signff(2+2*normspeed);
ccexp <= exponentff;
ccman <= mantissaff(23 DOWNTO 1);
END rtl;
|
-- The Potato Processor - A simple processor for FPGAs
-- (c) Kristian Klomsten Skordal 2014 <kristian.skordal@wafflemail.net>
-- Report bugs and issues on <https://github.com/skordal/potato/issues>
library ieee;
use ieee.std_logic_1164.all;
use work.pp_types.all;
package pp_constants is
--! No-operation instruction, addi x0, x0, 0.
constant RISCV_NOP : std_logic_vector(31 downto 0) := (31 downto 5 => '0') & b"10011"; --! ADDI x0, x0, 0.
end package pp_constants;
|
-- This file is part of the ethernet_mac_test project.
--
-- For the full copyright and license information, please read the
-- LICENSE.md file that was distributed with this source code.
library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
library ethernet_mac;
use ethernet_mac.ethernet_types.all;
entity ethernet_mac_test is
port(
clock_125_i : in std_ulogic;
phy_reset_o : out std_ulogic;
mdc_o : out std_ulogic;
mdio_io : inout std_ulogic;
mii_tx_clk_i : in std_ulogic;
mii_tx_er_o : out std_ulogic;
mii_tx_en_o : out std_ulogic;
mii_txd_o : out std_ulogic_vector(7 downto 0);
mii_rx_clk_i : in std_ulogic;
mii_rx_er_i : in std_ulogic;
mii_rx_dv_i : in std_ulogic;
mii_rxd_i : in std_ulogic_vector(7 downto 0);
gmii_gtx_clk_o : out std_ulogic;
led_o : out std_ulogic_vector(3 downto 0);
user_led_o : out std_ulogic
);
end entity;
architecture rtl of ethernet_mac_test is
signal clock : std_ulogic;
signal clock_inv : std_ulogic;
signal dcm_locked : std_ulogic;
signal reset : std_ulogic;
signal speed : t_ethernet_speed;
signal speed_detected : t_ethernet_speed;
signal link_up : std_ulogic;
signal rx_empty : std_ulogic;
signal rx_rd_en : std_ulogic;
signal rx_data : t_ethernet_data;
signal clock_unbuffered : std_ulogic;
signal copy_reset : std_ulogic;
signal tx_data : t_ethernet_data;
signal tx_wr_en : std_ulogic;
signal tx_full : std_ulogic;
type t_test_mode is (
TEST_LOOPBACK,
TEST_TX
);
-- Set to desired test
constant TEST_MODE : t_test_mode := TEST_LOOPBACK;
constant TEST_MODE_TX_PACKET_SIZE : positive := 1514;
type t_test_tx_state is (
TX_WAIT,
TX_WRITE_SIZE_HI,
TX_WRITE_SIZE_LO,
TX_WRITE_DATA
);
signal test_tx_state : t_test_tx_state;
signal test_tx_data_count : integer range 0 to TEST_MODE_TX_PACKET_SIZE;
signal test_tx_skip_next : std_ulogic := '0';
begin
-- From left to right above the Ethernet connector
led_o <= (not link_up) & (not speed) & "1";
phy_reset_o <= not reset;
user_led_o <= reset;
speed <= speed_detected;
test_proc : process(clock)
begin
if rising_edge(clock) then
tx_wr_en <= '0';
rx_rd_en <= '0';
if copy_reset = '1' then
test_tx_state <= TX_WAIT;
test_tx_skip_next <= '0';
else
case TEST_MODE is
when TEST_LOOPBACK =>
if rx_empty = '0' then
rx_rd_en <= '1';
if rx_rd_en = '1' then
-- If we are fast enough, the TX FIFO should never overflow
tx_wr_en <= '1';
tx_data <= rx_data;
end if;
end if;
when TEST_TX =>
if tx_full = '0' then
if test_tx_skip_next = '1' then
test_tx_skip_next <= '0';
-- Write remaining byte
if test_tx_state /= TX_WAIT then
tx_wr_en <= '1';
end if;
else
case test_tx_state is
when TX_WAIT =>
--if one_second_elapsed = '1' then
test_tx_state <= TX_WRITE_SIZE_HI;
--end if;
when TX_WRITE_SIZE_HI =>
tx_wr_en <= '1';
tx_data <= std_ulogic_vector(to_unsigned(TEST_MODE_TX_PACKET_SIZE, 16)(15 downto 8));
test_tx_state <= TX_WRITE_SIZE_LO;
when TX_WRITE_SIZE_LO =>
tx_wr_en <= '1';
tx_data <= std_ulogic_vector(to_unsigned(TEST_MODE_TX_PACKET_SIZE, 16)(7 downto 0));
test_tx_state <= TX_WRITE_DATA;
test_tx_data_count <= 0;
when TX_WRITE_DATA =>
tx_wr_en <= '1';
tx_data <= "11111111";
if test_tx_data_count = TEST_MODE_TX_PACKET_SIZE - 1 then
test_tx_state <= TX_WRITE_SIZE_HI;
end if;
test_tx_data_count <= test_tx_data_count + 1;
end case;
end if;
else
test_tx_skip_next <= '1';
end if;
end case;
end if;
end if;
end process;
reset_generator_inst : entity work.reset_generator
-- pragma translate_off
generic map(
RESET_DELAY => 10
)
-- pragma translate_on
port map(
clock_i => clock,
locked_i => dcm_locked,
reset_o => reset
);
clock_generator_inst : entity work.clock_generator
port map(
reset_i => reset,
clock_125_i => clock_125_i,
clock_125_o => clock,
clock_125_unbuffered_o => clock_unbuffered,
clock_125_inv_o => clock_inv,
clock_50_o => open,
locked_o => dcm_locked
);
ethernet_with_fifos_inst : entity ethernet_mac.ethernet_with_fifos
generic map(
MIIM_PHY_ADDRESS => "00111",
MIIM_RESET_WAIT_TICKS => 1250000 -- 10 ms at 125 MHz clock, minimum: 5 ms
)
port map(
clock_125_i => clock_unbuffered,
reset_i => reset,
rx_reset_o => copy_reset, -- Identical to tx_reset_o
mii_tx_clk_i => mii_tx_clk_i,
mii_tx_er_o => mii_tx_er_o,
mii_tx_en_o => mii_tx_en_o,
mii_txd_o => mii_txd_o,
mii_rx_clk_i => mii_rx_clk_i,
mii_rx_er_i => mii_rx_er_i,
mii_rx_dv_i => mii_rx_dv_i,
mii_rxd_i => mii_rxd_i,
gmii_gtx_clk_o => gmii_gtx_clk_o,
rgmii_tx_ctl_o => open,
rgmii_rx_ctl_i => '0',
miim_clock_i => clock,
mdc_o => mdc_o,
mdio_io => mdio_io,
link_up_o => link_up,
speed_o => speed_detected,
rx_clock_i => clock,
rx_empty_o => rx_empty,
rx_rd_en_i => rx_rd_en,
rx_data_o => rx_data,
tx_clock_i => clock,
tx_data_i => tx_data,
tx_wr_en_i => tx_wr_en,
tx_full_o => tx_full
-- Force 1000 Mbps/GMII in simulation only
-- pragma translate_off
, speed_override_i => SPEED_1000MBPS
-- pragma translate_on
);
end architecture;
|
package in_foo is
type thing is (x, y);
end package;
-------------------------------------------------------------------------------
entity issue226 is
end entity;
architecture test of issue226 is
begin
process is
variable l : std.textio.line; -- OK
begin
std.textio.write(l, string'("hello")); -- OK
end process;
process is
variable x : foo.in_foo.thing; -- Error
begin
end process;
end architecture;
|
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