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Ambiguity Threshold in PVS-LVS

LA2405x

Hello all,

I am working on a project where use a number of std filler cells. In LVS, these filler cells gave parameter missmatches, with the warning of ambiguous cells in the design.

So I adjusted the Ambiguity Threshold to the suggested number, and LVS passed. Nice!

But: What is this?
I looked documentation, but all I found was how to adjust this threshold (In GUI mode: LVS Options - Comparison Options Tab - Breaking Ambiguity Threshold).

What does it affect? Is there any downside (apart from LVS speed) to have a higher ambiguity threshold?

I am glad for any information about this - Thank you very much!

Adrian

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  • Andrew Beckett
    Adrian,

    The help tells you that this GUI setting is equivalent to lvs_break_ambig_max which is covered in the PVS Developer's Guide. I suggest you search in cdnshelp for lvs_break_ambig_max as this gives more detail on how it behaves.

    Regards,

    Andrew.
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  • Andrew Beckett
    Adrian,

    The help tells you that this GUI setting is equivalent to lvs_break_ambig_max which is covered in the PVS Developer's Guide. I suggest you search in cdnshelp for lvs_break_ambig_max as this gives more detail on how it behaves.

    Regards,

    Andrew.
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