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Transient simulation taking too much memory

vshssvs7

Sir,

I have to run a transient simulation of a transistor-level Charge Pump PLL. I have noticed that it is taking too much memory. icfb got shutdown by itself with this message at the terminal:

ERROR: Unable to allocate memory for transition file slice variable transition index level (read).

The simulation was not complete and it shutdown in between. The size of tran.tran.trn is around 40 GB.

Note that I have already done this: In Analog Design Environment, Outputs -> Save All, I have checked "selected" option in "select signals to output (save)" and Outputs -> to be saved -> select on schematic and selected few nets that I wanted to save

But even after doing the above, it is still saving every net (because I'm able to plot those nets) which is the reason for such a huge tran.tran.trn file. What more should I do to stop it from saving every net? (and only save the nets that I select) 

 

Parents

  • Sorry sir, I posted that message before I saw your reply.

    I (re)started the simulation again yesterday itself with strobe period as 10n in transient analysis options to reduce the data. The simulation is going on currently. I'm not sure what I checked/unchecked in 'save device currents' line when the problem occured (first time simulation). But currently input.scs file is as follows:

    simulatorOptions options reltol=1e-3 vabstol=1e-6 iabstol=1e-12 temp=27.0 \

        tnom=27 scalem=1.0 scale=1.0 gmin=1e-12 rforce=1 maxnotes=5 maxwarns=5 \

        digits=5 cols=80 pivrel=1e-3 sensfile="../psf/sens.output" \

        dochecklimit=yes checklimitdest=psf 

    tranCheckLimit checklimit checkallasserts=yes severity=none

    tran tran stop=30u errpreset=moderate write="spectre.ic" \

        writefinal="spectre.fc" annotate=status save=selected strobeperiod=10n \

        maxiters=5 

    finalTimeOP info what=oppoint where=rawfile

    designParamVals info what=parameters where=rawfile

    primitives info what=primitives where=rawfile

    subckts info what=subckts  where=rawfile

    asserts info what=assert  where=rawfile

    save vctl 

    saveOptions options save=none pwr=none useprobes=no

    ahdl_include "/cad/tools/cadencetools/IC5141_USR6/tools/dfII/samples/artist/ahdlLib/vco/veriloga/veriloga.va" 

Reply

  • Sorry sir, I posted that message before I saw your reply.

    I (re)started the simulation again yesterday itself with strobe period as 10n in transient analysis options to reduce the data. The simulation is going on currently. I'm not sure what I checked/unchecked in 'save device currents' line when the problem occured (first time simulation). But currently input.scs file is as follows:

    simulatorOptions options reltol=1e-3 vabstol=1e-6 iabstol=1e-12 temp=27.0 \

        tnom=27 scalem=1.0 scale=1.0 gmin=1e-12 rforce=1 maxnotes=5 maxwarns=5 \

        digits=5 cols=80 pivrel=1e-3 sensfile="../psf/sens.output" \

        dochecklimit=yes checklimitdest=psf 

    tranCheckLimit checklimit checkallasserts=yes severity=none

    tran tran stop=30u errpreset=moderate write="spectre.ic" \

        writefinal="spectre.fc" annotate=status save=selected strobeperiod=10n \

        maxiters=5 

    finalTimeOP info what=oppoint where=rawfile

    designParamVals info what=parameters where=rawfile

    primitives info what=primitives where=rawfile

    subckts info what=subckts  where=rawfile

    asserts info what=assert  where=rawfile

    save vctl 

    saveOptions options save=none pwr=none useprobes=no

    ahdl_include "/cad/tools/cadencetools/IC5141_USR6/tools/dfII/samples/artist/ahdlLib/vco/veriloga/veriloga.va" 

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