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Use via variant with auto via or via stack?

MatthewLove

On the technology I am using the default via width for the top metal is not DRC clean for our application.

I figured I could make a via variant to solve this.

The issue is that once a variant is made, its rows and columns are fixed e.g. if I make a variant and leave the rows and columns at 1x1, every array I make using the variant will be fixed at a size of 1x1.

https://community.cadence.com/cadence_technology_forums/f/custom-ic-design/34388/problem-with-auto-via-using-custom-via-variant

This was asked two years ago but there was no real solution given.

Any ideas?

  • Marc Heise

    Hi Matthew,

    there is a solution hinting that starting with 617ISR7 we will have an "Override Variant Parameters" option in the Via options form to overcome the 1x1 fixation.

    I don't know if you have access, but here is the link:

    https://support.cadence.com/apex/ArticleAttachmentPortal?id=a1Od00000066PwVEAU&pageName=ArticleContent&sq=

    What is keeping you from modifying the techlib via definition itself? I think you also could add a via definiton  with an ITDB lib.

    Kind regards,

    Marc

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