Subversion Repositories s1_core

Simply RISC S1 Core - Simulation Environment

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To run a simulation using the free software Icarus Verilog

simulator use the following commands:

  build_icarus

  run_icarus

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

find the "vcs" executable, and then type in the following

commands:

  build_vcs

  run_vcs

Within this design the only visible difference between Icarus

and VCS is the speed: the commercial tool could be hundreds of

times faster than its FLOSS counterpart; but with Icarus if

you have time to wait for some minutes you will obtain exactly

the same results just using free software.

At the end of the simulation you can look at the logfile and

at the waveforms placed at the following paths:

  run/sim/icarus/sim.log

  run/sim/icarus/trace.vcd

  run/sim/vcs/sim.log

  run/sim/vcs/trace.vcd

Obviously if you do not have access to a commercial tool you

can use GTKWave to look at the waveforms: for instance from

the top-level directory just type in the following command:

  gtkwave run/sim/icarus/trace.vcd &

and then from "File|Read Save File" choose the file named

"tools/src/gtkwave.sav".