examples/gen_sync.v

module gen_sync ( input clock,input reset,input enable,input [7:0] rate,output wire sync );
 
  reg [7:0] counter; 
  assign sync = |(((rate+1)>>1)& counter); 
  always @(posedge clock) 
  if(reset || ~enable) 
  counter <= #1 0; 
  else if(counter == rate) 
  counter <= #1 0; 
  else 
  counter <= #1 counter + 8'd1; 
 endmodule