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To run a simulation using the free software Icarus Verilog
To run a simulation using the free software Icarus Verilog
simulator use the following commands:
simulator use the following commands:
 
 
  build_icarus
  s1_sim_build icarus
  run_icarus
  compile_test hello
 
  s1_sim_run icarus
 
 
If you want to use a commercial tool such as Synopsys VCS then
If you want to use a commercial tool such as Synopsys VCS then
set up your PATH enviroment variable so that you are able to
set up your PATH enviroment variable so that you are able to
find the "vcs" executable, and then type in the following
find the "vcs" executable, and then type in the following
commands:
commands:
 
 
  build_vcs
  s1_sim_build vcs
  run_vcs
  compile_test hello
 
  s1_simrun vcs
 
 
Within this design the only visible difference between Icarus
Within this design the only visible difference between Icarus
and VCS is the speed: the commercial tool could be hundreds of
and VCS is the speed: the commercial tool could be hundreds of
times faster than its FLOSS counterpart; but with Icarus if
times faster than its FLOSS counterpart; but with Icarus if
you have time to wait for some minutes you will obtain exactly
you have time to wait for some minutes you will obtain exactly

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