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randomizing real values in vsif

Petros

It might be an unconventional approach but I need to pass some user defined arguments that have constrained value to a test and are of type real.

In the vsif file for regression I want to randomize those values in order for them to be different in each test.

Is there a way to do this? the only randomization I found in the manual is for integers used as seeds.

Thanks in advance

  • Why not randomise some real number variables inside the testbench, so that the random values are determined by the same single SV seed that does the digital values?

  • in reply to StephenH

    Hi Stephen, thanks for your response!

    My objective is somewhat different.
    If those arguments are not passed by command line, then the DUT will randomize them. This means i have to get them to the TB via a virtual interface. I will end up doing this as it is proper practice, however i was wondering if randomizing real values with constrains is possible in vsif since i didn't find anything in the manual

  • in reply to Petros

    The VSIF only allows for a randomly generated SV seed (signed 32-bit integer).

    Xcelium allows you to randomise "real" variables and you can put constraints on the variables.

    I don't understand how your DUT would randomise values, normally one would randomise them in the testbench and send them to the DUT! :-/

  • in reply to StephenH

    Indeed but it is a legacy project so I cant change the actual DUT code in which these values are randomized :(

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