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dynamic parameter in transient sim with paramset file using design variable & arithmetic

vamshiky

Hi,

I wanted to control the time steps used in paramset file while dynamically changing the design variable in transient sim.

It this usage supported?

codesweep paramset {
time                 code
VAR("tstep")        1
2*VAR("tstep")     2
3*VAR("tstep")     3
....
....
}
Tried the above  in a file and included(with proper *.scs extension ) in the netlist, but the syntax here seems incorrect.
Thanks,
vamshiky

  • The syntax wouldn't be to use VAR("tstep") since that's ADE rather than Spectre syntax, but despite some fixes made in SPECTRE 21.1 ISR9, only design variables are supported in paramset (so just tstep) and not expressions of design variables/parameters.

    So this is not currently possible. Looking at the existing CCRs on this, 1939321/2189455 this part seems to have been overlooked.

    Andrew

  • in reply to Andrew Beckett

    Thanks for the comment Andrew, is there any workaround for this?

    vamshiky

  • in reply to vamshiky

    The workaround is to define parameters for each multiple - you can have parameters in the paramset currently, just not expressions (since SPECTRE21.1 ISR9):

    parameters tstep=100n tstepX2=tstep*2 tstepX3=tstep*3

    codesweep paramset {
    time                 code
    tstep       1
    tstepX2     2
    tstepX3     3
    ...
    ...
    }

    Of course, that will get a bit painful if there are a lot of them.

    Andrew

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