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A stochastic model in Verilog A for Monte Carlo simulation

UUinfini

 Hello Guys,

I have a problem for Veriglog A in Cadence, I hope you can help me. In fact I need to elaborate a stochastic model by coding in Verilog A executed under Cadence. My aim is to offer a model with which the customers can do the Monte Carlo Analysis. But I used the functions like "$random", "$temperature" etc. to generate a seed for obtaining a parameter which changes each time of simulation. But finally it changes just according to the real time of simulation, but not according to different times of simulation. Do you have any experiences like this? Thank you for you response.

Best regards,

UU

Parents

  • Thanks. I assume you've already removed the "seedin" CDF parameter (since it's not in the dump above), so it may well work already, but if you still have a problem, type this in the CIW:

    almSetParameterList("PMAMTJ40symstoRp" "source" nil ?view "veriloga")

    This will remove the "seedin" parameter from being potentially netlisted when the veriloga view is used. Note that you will still need to fix your source.scs file if it still contains a copy of the above dump information and replace it with the "statistics" block definition etc.

    I'm pretty certain that the problem was due to the spectre version you're using causing the parameter with the cds_inherited_parameter attribute being identified as a normal parameter when the veriloga was parsed. Ah yes, it was - CCR 922010 was filed (by me) for this issue, and it was fixed in MMSIM11.1 ISR17. No need to switch versions of spectre if you use the workaround above - see this post.

    Regards,

    Andrew.

Reply

  • Thanks. I assume you've already removed the "seedin" CDF parameter (since it's not in the dump above), so it may well work already, but if you still have a problem, type this in the CIW:

    almSetParameterList("PMAMTJ40symstoRp" "source" nil ?view "veriloga")

    This will remove the "seedin" parameter from being potentially netlisted when the veriloga view is used. Note that you will still need to fix your source.scs file if it still contains a copy of the above dump information and replace it with the "statistics" block definition etc.

    I'm pretty certain that the problem was due to the spectre version you're using causing the parameter with the cds_inherited_parameter attribute being identified as a normal parameter when the veriloga was parsed. Ah yes, it was - CCR 922010 was filed (by me) for this issue, and it was fixed in MMSIM11.1 ISR17. No need to switch versions of spectre if you use the workaround above - see this post.

    Regards,

    Andrew.

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