howo to run openroad by reading an existing DEF file
Tool: OpenDB
Subcategory: Initialization from existing DEF
Conversation
bittnada
Hello I have a DEF file in which row, track, components, and pins are written. The position of the cells are on the step of global placement, obtained by using another method. Now, I want to finish the rest of the procedures by modifying "test/flow.tcl" file. I just skipped the steps of pin placement and global placement and added "read_def [my_def_fiel}'", but it did not work. I will appreciate if anyone let me know how to solve this problem. Thanks,
maliberty
What happened when it "did not work"? Its not much to go on.
bittnada
Sorry for my delayed response.
I've just conducted a test using gcd_nangate45.tcl, and I've created my own DEF file containing rows, tracks, pins, nets, and components. I performed a simple test by modifying a flow.tcl script to skip buffer insertion, IO placement, Macro Placement, tap cell insertion, power distribution, and global placement, and then adding "read_def".
After running gcd_nangate45.tcl, I received the following output:
==================================================================================== OpenROAD v2.0-13652-g6fc686431 Features included (+) or not (-): +Charts +GPU +GUI +Python This program is licensed under the BSD-3 license. See the LICENSE file for details. Components of this program may be licensed under more restrictive licenses which must be honored. [INFO ODB-0227] LEF file: Nangate45/Nangate45_tech.lef, created 22 layers, 27 vias [INFO ODB-0227] LEF file: Nangate45/Nangate45_stdcell.lef, created 135 library cells [WARNING STA-0441] set_input_delay relative to a clock defined on the same port/pin not allowed. [INFO IFP-0001] Added 57 rows of 422 site FreePDK45_38x28_10R_NP_162NW_34O. [INFO ORD-0048] Loading an additional DEF. Error: Chip already exists [INFO RSZ-0058] Using max wire length 693um. [INFO RSZ-0039] Resized 41 instances. Placement Analysis
total displacement 17739.5 u average displacement 49.0 u max displacement 62.9 u original HPWL 280.4 u legalized HPWL 9839.7 u delta HPWL 3410 %
worst slack 0.105 worst slack -0.011 tns -0.011 [INFO CTS-0050] Root buffer is BUF_X4. [INFO CTS-0051] Sink buffer is BUF_X4. [INFO CTS-0052] The following clock buffers will be used for CTS: BUF_X4 [INFO CTS-0049] Characterization buffer is BUF_X4. [INFO CTS-0007] Net "clk" found for clock "core_clock". [WARNING CTS-0041] Net "clk" has 0 sinks. Skipping... [WARNING CTS-0083] No clock nets have been found. [INFO CTS-0008] TritonCTS found 0 clock nets. [WARNING CTS-0082] No valid clock nets in the design. [INFO RSZ-0058] Using max wire length 693um. Placement Analysis
total displacement 0.0 u average displacement 0.0 u max displacement 0.0 u original HPWL 9839.7 u legalized HPWL 9839.7 u delta HPWL 0 %
[INFO RSZ-0094] Found 1 endpoints with setup violations. [WARNING RSZ-0075] makeBufferedNet failed for driver 393/ZN [WARNING RSZ-0075] makeBufferedNet failed for driver 393/ZN [WARNING RSZ-0075] makeBufferedNet failed for driver 393/ZN [WARNING RSZ-0075] makeBufferedNet failed for driver 393/ZN [INFO RSZ-0041] Resized 5 instances. [INFO RSZ-0043] Swapped pins on 2 instances. [INFO RSZ-0033] No hold violations found. worst slack 0.106 worst slack 0.000 tns 0.000 Placement Analysis
total displacement 91.3 u average displacement 0.3 u max displacement 6.4 u original HPWL 9840.8 u legalized HPWL 9925.0 u delta HPWL 1 %
[INFO DRT-0149] Reading tech and libs.
Units: 2000 Number of layers: 21 Number of macros: 135 Number of vias: 27 Number of viarulegen: 19
Signal 11 received Stack trace: 0# 0x0000564758181A44 in /mnt/work/OpenROAD/bin/bin/openroad 1# 0x00007F4028F54F10 in /lib/x86_64-linux-gnu/libc.so.6 2# odb::dbTechVia::getTopLayer() in /mnt/work/OpenROAD/bin/bin/openroad 3# odb::dbWireEncoder::addTechVia(odb::dbTechVia*) in /mnt/work/OpenROAD/bin/bin/openroad 4# drt::TritonRoute::stackVias(odb::dbBTerm*, int, int, bool) in /mnt/work/OpenROAD/bin/bin/openroad 5# drt::TritonRoute::processBTermsAboveTopLayer(bool) in /mnt/work/OpenROAD/bin/bin/openroad 6# drt::TritonRoute::initDesign() in /mnt/work/OpenROAD/bin/bin/openroad 7# drt::TritonRoute::pinAccess(std::vector<odb::dbInst*, std::allocatorodb::dbInst* > const&) in /mnt/work/OpenROAD/bin/bin/openroad 8# pin_access_cmd(char const*, char const*, char const*, int, int) in /mnt/work/OpenROAD/bin/bin/openroad 9# 0x00005647589E491B in /mnt/work/OpenROAD/bin/bin/openroad 10# TclNRRunCallbacks in /usr/lib/x86_64-linux-gnu/libtcl8.6.so 11# 0x00007F402E79BFBA in /usr/lib/x86_64-linux-gnu/libtcl8.6.so 12# Tcl_EvalEx in /usr/lib/x86_64-linux-gnu/libtcl8.6.so 13# Tcl_Eval in /usr/lib/x86_64-linux-gnu/libtcl8.6.so 14# gui::TclCmdInputWidget::executeCommand(QString const&, bool, bool) in /mnt/work/OpenROAD/bin/bin/openroad 15# gui::CmdInputWidget::handleEnterKeyPress(QKeyEvent*) in /mnt/work/OpenROAD/bin/bin/openroad 16# gui::TclCmdInputWidget::keyPressEvent(QKeyEvent*) in /mnt/work/OpenROAD/bin/bin/openroad 17# QWidget::event(QEvent*) in /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5 18# QFrame::event(QEvent*) in /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5 19# QAbstractScrollArea::event(QEvent*) in /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5 20# QPlainTextEdit::event(QEvent*) in /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5 21# QApplicationPrivate::notify_helper(QObject*, QEvent*) in /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5 22# QApplication::notify(QObject*, QEvent*) in /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5 23# QCoreApplication::notifyInternal2(QObject*, QEvent*) in /usr/lib/x86_64-linux-gnu/libQt5Core.so.5 24# 0x00007F402B1357B5 in /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5 25# QApplicationPrivate::notify_helper(QObject*, QEvent*) in /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5 26# QApplication::notify(QObject*, QEvent*) in /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5 27# QCoreApplication::notifyInternal2(QObject*, QEvent*) in /usr/lib/x86_64-linux-gnu/libQt5Core.so.5 28# QGuiApplicationPrivate::processKeyEvent(QWindowSystemInterfacePrivate::KeyEvent*) in /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5 29# QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) in /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5 30# QWindowSystemInterface::sendWindowSystemEvents(QFlagsQEventLoop::ProcessEventsFlag) in /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5 31# 0x00007F4022595260 in /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5 32# g_main_context_dispatch in /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0 33# 0x00007F402783C770 in /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0 34# g_main_context_iteration in /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0 35# QEventDispatcherGlib::processEvents(QFlagsQEventLoop::ProcessEventsFlag) in /usr/lib/x86_64-linux-gnu/libQt5Core.so.5 36# QEventLoop::exec(QFlagsQEventLoop::ProcessEventsFlag) in /usr/lib/x86_64-linux-gnu/libQt5Core.so.5 37# QCoreApplication::exec() in /usr/lib/x86_64-linux-gnu/libQt5Core.so.5 38# gui::startGui(int&, char**, Tcl_Interp*, std::__cxx11::basic_string<char, std::char_traits, std::allocator > const&, bool) in /mnt/work/OpenROAD/bin/bin/openroad 39# ord::tclAppInit(Tcl_Interp*) in /mnt/work/OpenROAD/bin/bin/openroad 40# Tcl_MainEx in /usr/lib/x86_64-linux-gnu/libtcl8.6.so 41# main in /mnt/work/OpenROAD/bin/bin/openroad 42# __libc_start_main in /lib/x86_64-linux-gnu/libc.so.6 43# _start in /mnt/work/OpenROAD/bin/bin/openroad
I also examined the source codes and realized that the testing approach I employed did not yield the desired results. However, I am unsure about how to proceed from the step after global placement by reading the DEF file.
Thanks.