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dc_pivot_check not working within ocean

oyayla

Hi,

I am running spectre simulation using ocean script and getting Bad pivoting during DC analysis. I have added dc_pivot_check as below but it is not accepted by ocean.

option( ?categ 'turboOpts
'numThreads "4"
'mtOption "Manual"
'uniMode "APS"
'dc_pivot_check "yes"

In log file, I am getting below warning:

\o WARNING (OCN-6012): Invalid option: dc_pivot_check. Use ocnDisplay('option) to see the list of options, or
\o use ocnHelp('option). You can also refer to online help on simulator.

I have searched ocean documents but couldn't find how to include the dc_pivot_check. One more thing, when ADEL state is saved as ocean script, the format is same as above.

Thanks

yayla

  • Andrew Beckett

    Hi Yayla,

    You didn't mention which IC version (or subversion) you're using (Help->About... will tell you). From a quick check. it seems that dc_pivot_check was added into the ADE user interface in IC616 ISR10 (6.1.6.500.10). Assuming you're using an older version (this version came out over 4 years ago), then you'd have to do:

    option( 'additionalArgs "dc_pivot_check=yes")

    This is the "get out of jail free" card for spectre options not yet supported through the UI - you're using the Additional Arguments field on the Miscellaneous tab of the Simulation->Options->Analog form in ADE to do this.

    Regards,

    Andrew.

  • oyayla
    in reply to Andrew Beckett

    Hi Andrew,

    Thanks for the reply. My IC version is: ICADV12.3-64b.500.18. Also Tool 'cadenceMMSIM' Current project version '16.10.479

    When I use the GUI, I can see the dc_pivot_check option in Simulator Options/Algorithm window btw. That seems to work if I choose that option from GUI though running sim in ocean doesn't recognize.

    Thanks

    yayla

  • Andrew Beckett
    in reply to oyayla

    Hi Yayla,

    Ah, I just re-read your original post (I read it on my phone initially and missed this important aspect). The issue is that you've lumped in the dc_pivot_check setting with other settings in the turboOpts category. This option is not a turboOpts related option. So instead, call options() twice:

    option( ?categ 'turboOpts
      'numThreads "4"
      'mtOption "Manual"
      'uniMode "APS"
    )
    option('dc_pivot_check "yes")

    Then it will work (with the version you're using, certainly - I checked).

    Regards,

    Andrew.

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