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The way to define variable correlated to ac simulation in .scs model

sjwprcker

Greetings,

I would like to run AC sim in one test once in case of two sub-conditions

1) ac source1 active with acm1 = 1, ac source2 off with acm2=0

2) ac source1 off with acm1 = 0, ac source2 active with acm2=1

so i define such an ac_analysis.scs and load it the corner setup as

section ac_analysis

ac1 ac start=0.1 stop=10M dec=50 acm1=1 acm2=0

ac2 ac start=0.1 stop=10M dec=50 acm1=0 acm2=1

endsection ac_analysis

However, maestro can not recognize the difference of acm1 and acm2. So how i can improve the .scs model?

Thanks. 

Parents
  • Andrew Beckett

    It's not really "maestro" not being able to recognise this. You have invalid ac analysis statements in spectre - you can't just change netlist parameters on an analysis line - the parameters on the analysis line are analysis parameters.

    You can do this with alters:

    section ac_analysis

    alt1 alter param=acm1 value=1
    alt2 alter param=acm2 value=0
    ac1 ac start=0.1 stop=10M dec=50

    alt3 alter param=acm1 value=0
    alt4 alter param=acm2 value=1
    ac2 ac start=0.1 stop=10M dec=50

    endsection ac_analysis

    Andrew

Reply
  • Andrew Beckett

    It's not really "maestro" not being able to recognise this. You have invalid ac analysis statements in spectre - you can't just change netlist parameters on an analysis line - the parameters on the analysis line are analysis parameters.

    You can do this with alters:

    section ac_analysis

    alt1 alter param=acm1 value=1
    alt2 alter param=acm2 value=0
    ac1 ac start=0.1 stop=10M dec=50

    alt3 alter param=acm1 value=0
    alt4 alter param=acm2 value=1
    ac2 ac start=0.1 stop=10M dec=50

    endsection ac_analysis

    Andrew

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