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Referencing a design variable to another - ADE Assembler

EmJay

Hello,

I am trying to create design variable where the second one depends on the other. Lets say the variables are A and B. 

If A = 1:0.1:2, if I want the B to vary from the value of A to 3 as in B = A:0.1:3. How do I do this?

I tried setting it in the way I mentioned above, virtuoso popped an error. Or, is there a way where I can automatically select the test cases where B >A  even after setting B from 0 rather than manually selecting one by one?

Thank you.

Parents
  • Andrew Beckett

    This isn't possible. You can have dependent expressions which reference other variables, but you cannot reference variables in the sweep limits or step (it would lead to an unpredictable set of combinations to do which would be problematic in principle, so it's not supported.

    Whilst you can filter the results afterwards based on parameter values, that filtering can't be based on the relationship of two variables.

    So I don't think you can do either way, sorry.

    You could however generate the full set and then use the run preview to turn off the combinations you don't want to run - but this would be a manual step. I did wonder whether it might be possible to write SKILL to disable entries in the run preview but there isn't currently a SKILL function to do that as far as I know, and I've only seen requests to provide a function to get the information rather than setting it. You can export to CSV but not import - so that doesn't help. So altering the run preview manually is probably the only way.

    Regards,

    Andrew

  • StephanWeber
    in reply to Andrew Beckett

    Hi, isn't Cadence supporting something in Verifier on library level, kind of templates for variables and corner setup? Could this help on this problem too?

    Bye Stephan

  • Andrew Beckett
    in reply to StephanWeber

    Stephan,

    There is the "Setup Library Assistant" which allows sharing and re-use of common sweeps and corner setups (which is covered by the Verifier license, but usable in ADE Assembler). It will not help with this problem though, which is specifically about having the sweep limits defined by a variable.

    Andrew

Reply
  • Andrew Beckett
    in reply to StephanWeber

    Stephan,

    There is the "Setup Library Assistant" which allows sharing and re-use of common sweeps and corner setups (which is covered by the Verifier license, but usable in ADE Assembler). It will not help with this problem though, which is specifically about having the sweep limits defined by a variable.

    Andrew

Children
  • StephanWeber
    in reply to Andrew Beckett

    Thanks for clarification, Andrew.

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