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How to save Spectre tran results over just a specific period in a simulation

FormerMember
FormerMember

Hello,

I am running a spectre simulation from the command line and, as my simulation is large and extracted, I'd like just to save the tran results over a certain period. Not for the whole simulation.

My current command is

spectre ++aps +multithread -f fsdb VO15A_SERDES_TOP.sp -o /home/suppdm3/ANSYS/VO15A_SERDES_TOP

I haven't been able to find the option that I need to just specify say from "10ns to 20ns" for my simulation.

The call within my spectre.scs file is

tran tran stop=25n write="spectre.ic" writefinal="spectre.fc" \
    annotate=status maxiters=5

I think this must be a pretty easy option to define but I haven't found the right syntax.

Thanks for the help,

Matthew Cordrey-Gale

Parents
  • Andrew Beckett

    Hi Matthew,

    If using a recent IC617/SPECTRE171 version combination (might be OK with SPECTRE161 too), you now have a choice of defining windows to save particular signals - on the Outputs->Save All form in ADE:

    Then you can check this checkbox and click the Time Setup and choose which signals to save for which time windows:

    If using an older IC version, you potentially could add an include file with:

    save net9 vin out time_window=[10u 20u]

    (check "spectre -h save" to see if it supports time_window).

    Or, a simpler solution still could be just to use the outputstart parameter on the tran analysis. This just says when to start saving outputs. Typically I would imagine that you probably don't want to continue simulating beyond when you stop outputting signals as otherwise you can't see what's going on! This will work in any version since it's been there forever.

    Regards,

    Andrew.

Reply
  • Andrew Beckett

    Hi Matthew,

    If using a recent IC617/SPECTRE171 version combination (might be OK with SPECTRE161 too), you now have a choice of defining windows to save particular signals - on the Outputs->Save All form in ADE:

    Then you can check this checkbox and click the Time Setup and choose which signals to save for which time windows:

    If using an older IC version, you potentially could add an include file with:

    save net9 vin out time_window=[10u 20u]

    (check "spectre -h save" to see if it supports time_window).

    Or, a simpler solution still could be just to use the outputstart parameter on the tran analysis. This just says when to start saving outputs. Typically I would imagine that you probably don't want to continue simulating beyond when you stop outputting signals as otherwise you can't see what's going on! This will work in any version since it's been there forever.

    Regards,

    Andrew.

Children
  • FormerMember
    FormerMember in reply to Andrew Beckett

    Hi Andrew,

    Thanks for the wide set of info on my problem. As you correctly guessed the outputstart was what I needed but the other stuff is useful too.

    My output file has gone from 12Gb to 2G. Thanks for the help.

    Matthew

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