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Short-resistor removal for LVS cleaning (Cadence Virtuoso + Pegasus)

yogeshjaiswalCAD

Greetings Team,

 

Thanks for always being there for help, I am working on TSMCN22 node, facing issue in Pegasus LVS cleaning as it not truncates shorted rupolym

Resistor (Plus & Minus) shorted

 

Cadence Virtuoso + Pegasus

Short-resistor removal for LVS cleaning

Best practice: device-level LVS filtering

 

Recommended (ONE-LINE SOLUTION)

 

lvs_filter_device rupolym -short_pins [PLUS MINUS]

 

What this does

  • Applies to Pegasus LVS + extraction
  • If a rupolym resistor has PLUS and MINUS on the same net:
    • X Device is removed from LVS
    • X Device is removed from spi
  • Layout geometry remains → DRC unaffected

This is the official Pegasus mechanism for shorted passives, When I am using above option to Pegasus- LVS run is taking lot of time (almost 15hour on IP) without above option is it will take on half hour to run.

Request : Please provide PVL code or any other advice or trick to remove shorted resistor rupolym in pegasus  LVS process 

Please suggest to me what option needs to be checked or selected in the Pegasus LVS option tab. 
I will be grateful for your help. Please help in !

With Warm Regards,

Yogesh Jaiswal

 

Parents
  • pchris

    Hi Yogesh,

    Two thoughts here:

    1. Your use of lvs_filter_device looks correct apart from teh syntak needing a small tweak. I quickly tried with a simple TSMC N22 example and used:

                        lvs_filter_device rupolym -short PLUS MINUS

    I see the devices filtered in the Statistics section of the <report_name>.cls file for cell in question. You can also get a summary of what has been filtered by adding lvs_report_opt -filtered_devices. This writes a report file in the run directory <report_name>.cfr.

    2. From your description though the drastic increase in run time you report should be looked at, for this please file a support case at  https://support.cadence.com/

    Best regards,

     

                   Chris

Reply
  • pchris

    Hi Yogesh,

    Two thoughts here:

    1. Your use of lvs_filter_device looks correct apart from teh syntak needing a small tweak. I quickly tried with a simple TSMC N22 example and used:

                        lvs_filter_device rupolym -short PLUS MINUS

    I see the devices filtered in the Statistics section of the <report_name>.cls file for cell in question. You can also get a summary of what has been filtered by adding lvs_report_opt -filtered_devices. This writes a report file in the run directory <report_name>.cfr.

    2. From your description though the drastic increase in run time you report should be looked at, for this please file a support case at  https://support.cadence.com/

    Best regards,

     

                   Chris

Children
  • yogeshjaiswalCAD
    in reply to pchris

    Greetings Chris,

    Thank you for always being there to help! It really means a lot to me that you take time out of your busy schedule to respond.

    I am able to solve my problem with the help of some of your excellent articles, which guided me in the right direction.

    Once again thanks for warm gesture

    Have a pleasant day!

    Cheers & regards,

    Yogesh Jaiswal 

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