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Assura LVS - How to force shorted layout devices to be netlisted and compared?

miketqs
I would like to LVS shorted layout devices (resistors used for analog matching purposes, shorted to power or ground), but I can't get them to netlist on the layout side. I have commented out the filter("X") command in the compare.rul file. I also tried changing the device type from Generic to RES, but the shorted devices still don't netlist or get compared.

  • Hi miketqs

    The shorted layout resistor should not be filtered out if option "X" is not used. Would you please execute the following egrep cmd in the Assura rules file directory to check if there are any filter/filterOptions command which might have been missed out?

    terminal>egrep -ir "filter" your-rules-file-directory

    If you cannot find any useful info from the egrep cmd, would you please add avCompareRules option "echoUsedAvCompareRules", re-run LVS and upload your assura log file as an attachment?

    By the way, "filter" cmd has already been obsoleted and should be replaced by "filterOptions" cmd.

    Thanks
    Quek

  • Hello Quek,

    I resolved the problem.

    The real issue was that the shorted devices were being flagged as malformed devices, and this was causing them to not show up in the layout netlist.  Since these devices were generically defined using an extractDevice statement (as opposed to extractRES), the solution was to add in the "physical" option to the device statement.

    Thanks,
    -Mike

  • Hi Mike

    That's great. : )  Thanks for the follow-up on the issue.

    Best regards
    Quek

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