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Limited plot range

Bhavsh

Hi,

   I am using ic5141 and tried to simulate ADC(4-bit analog to digital converter) in ADE. I opted for transient analysis for 100ms. It simulated successfully but through "direct plot form" or through "calculator" if we plot, it is plotting the respective voltage values only upto 20ms.Beyond 20ms its not showing any result. Are there  any option to go beyond 20ms??

Thank you..

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  • Hi Mandar,

    I don't see any posts needing moderating, so not sure what's going on there...

    Anyway, this is definitely a known problem with sst2 support - it may well be fixed in a newer IC subversion than the one you're using (I can't check right now because I'm at home). psfbin won't have this problem though (it's related to changing the stop time by a large amount and it causes some resolution problems, or something like that).

    Before starting ADE, in the CIW (or in your .cdsinit) put:

    envSetVal("spectre.envOpts" "simOutputFormat" 'string "psfbin")

    (I think I got that right; again, I can't check right now). Then start ADE. You might well want to force it to renetlist (Simulation->Netlist->Recreate) because there are some slight delimiter differences between SST2 and PSF which need to be stored in the amap directory (again, this is from memory).

    Then simulate as usual. It should then behave.

    You might also need to want to tell spectre and ultrasim to write large PSF files (greater than 2G) to use the older "chunk mode" (IC61 supports large files directly) by doing:

    setenv PSF_WRITE_CHUNK_MODE_ON true

    setenv PSF_LARGE_FILE_ON false

    The first is for spectre, and the second is for Ultrasim.This is described in solution 11264780 on Cadence Online Support. Of course, this needs to be done before you run icfb.

    In your case, the files are tiny, so shouldn't be an issue, but a worthwhile precaution.

    Regards,

    Andrew.

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  • Hi Mandar,

    I don't see any posts needing moderating, so not sure what's going on there...

    Anyway, this is definitely a known problem with sst2 support - it may well be fixed in a newer IC subversion than the one you're using (I can't check right now because I'm at home). psfbin won't have this problem though (it's related to changing the stop time by a large amount and it causes some resolution problems, or something like that).

    Before starting ADE, in the CIW (or in your .cdsinit) put:

    envSetVal("spectre.envOpts" "simOutputFormat" 'string "psfbin")

    (I think I got that right; again, I can't check right now). Then start ADE. You might well want to force it to renetlist (Simulation->Netlist->Recreate) because there are some slight delimiter differences between SST2 and PSF which need to be stored in the amap directory (again, this is from memory).

    Then simulate as usual. It should then behave.

    You might also need to want to tell spectre and ultrasim to write large PSF files (greater than 2G) to use the older "chunk mode" (IC61 supports large files directly) by doing:

    setenv PSF_WRITE_CHUNK_MODE_ON true

    setenv PSF_LARGE_FILE_ON false

    The first is for spectre, and the second is for Ultrasim.This is described in solution 11264780 on Cadence Online Support. Of course, this needs to be done before you run icfb.

    In your case, the files are tiny, so shouldn't be an issue, but a worthwhile precaution.

    Regards,

    Andrew.

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