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Automating multiple simulation runs of testbench with different parameters each time

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BartlebyScrivener

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I have written a test bench for a SystemVerilog design that has multiple parameters. I know if I wanted to load this in another module I would call it something like this ...

Code: 
testBench #(parameterA, parameterB, parameterC)

But I don't want to call it in another module, I want to run 20 simulations for 20000ns, each simulation increasing the value of parameter C by one each time.

I am currently using ModelSim to simulate by manually changing the parameter values in the file, re-compiling and loading the simulation by typing 'vsim testBench', then typing 'run 20000ns', then repeating this procedure ad nauseum.

How can I automate this?
 

The modelsim .do files are tcl scripts, so you easily write a script that increments the parameter, recompile, and re-run simulation.

BartlebyScrivener said:
I have written a test bench for a SystemVerilog design that has multiple parameters. I know if I wanted to load this in another module I would call it something like this ...

Code: 
testBench #(parameterA, parameterB, parameterC)

But I don't want to call it in another module, I want to run 20 simulations for 20000ns, each simulation increasing the value of parameter C by one each time.

I am currently using ModelSim to simulate by manually changing the parameter values in the file, re-compiling and loading the simulation by typing 'vsim testBench', then typing 'run 20000ns', then repeating this procedure ad nauseum.

How can I automate this?
Click to expand...
 
If you want to automate this, you need to instantiate your testBench in another module top, giving it a default set of parameter values. Then use the vsim -G switch in a script that loops producing:

Code: 
vsim -G/top/tb/parameterC=1 top -do "run 20000ns;quit -f"
vsim -G/top/tb/parameterC=2 top -do "run 20000ns;quit -f"
vsim -G/top/tb/parameterC=3 top -do "run 20000ns;quit -f"
 

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