Simply RISC S1 Core - Simulation Environment
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Simply RISC S1 Core - Simulation Environment
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============================================
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To run a simulation using the free software Icarus Verilog
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To run a simulation using the free software Icarus Verilog
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simulator use the following commands:
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simulator use the following commands:
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build_icarus
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build_icarus
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run_icarus
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run_icarus
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If you want to use a commercial tool such as Synopsys VCS then
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If you want to use a commercial tool such as Synopsys VCS then
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set up your PATH enviroment variable so that you are able to
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set up your PATH enviroment variable so that you are able to
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find the "vcs" executable, and then type in the following
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find the "vcs" executable, and then type in the following
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commands:
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commands:
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build_vcs
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build_vcs
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run_vcs
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run_vcs
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Within this design the only visible difference between Icarus
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Within this design the only visible difference between Icarus
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and VCS is the speed: the commercial tool could be hundreds of
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and VCS is the speed: the commercial tool could be hundreds of
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times faster than its FLOSS counterpart; but with Icarus if
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times faster than its FLOSS counterpart; but with Icarus if
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you have time to wait for some minutes you will obtain exactly
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you have time to wait for some minutes you will obtain exactly
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the same results just using free software.
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the same results just using free software.
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At the end of the simulation you can look at the logfile and
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At the end of the simulation you can look at the logfile and
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at the waveforms placed at the following paths:
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at the waveforms placed at the following paths:
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run/sim/icarus/sim.log
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run/sim/icarus/sim.log
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run/sim/icarus/trace.vcd
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run/sim/icarus/trace.vcd
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run/sim/vcs/sim.log
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run/sim/vcs/sim.log
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run/sim/vcs/trace.vcd
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run/sim/vcs/trace.vcd
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Obviously if you do not have access to a commercial tool you
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Obviously if you do not have access to a commercial tool you
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can use GTKWave to look at the waveforms: for instance from
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can use GTKWave to look at the waveforms: for instance from
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the top-level directory just type in the following command:
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the top-level directory just type in the following command:
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gtkwave run/sim/icarus/trace.vcd &
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gtkwave run/sim/icarus/trace.vcd &
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and then from "File|Read Save File" choose the file named
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and then from "File|Read Save File" choose the file named
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"tools/src/gtkwave.sav".
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"tools/src/gtkwave.sav".
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