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Innovus vs Calibre DRC results

Anas2023a95

Dear all, 

I have a DRC-clean design on Innovus (verified by the Innovus tool: Verify -> Verify DRC). However, when I extract the GDS and import it into Calibre, hundreds of errors are highlighted! Calibre uses a separate DRC_rule_file which, I think, Innovus has no access to.
I guess Innovus only uses the rules in the .LEF files to generate and verify the layout, am I right?
Is it possible to feed the DRC_rule_file (what Calibre reads) to Innouvs so the generated layout meets those rules?
Should I trust Innovus and go ahead with the current design?
Could it be an issue with generating the GDS file? 

Many thanks,

Anas

Parents

  • Hi Anas,
    Calibre uses a runset file which cannot be consumed by Innovus. Innovus uses and knows only the rules as defined in the techLef.
    Sometimes it can happen that a rule is missing in Innovus or it is interpreted differently, but what we see here are 420000 violations for even simple width and spacing rules.

    Something went wrong with the setup of either Innovus or Calibre.

    Should I trust Innovus and go ahead with the current design? --> No, you need to resolve this issue.

    Could it be an issue with generating the GDS file?  --> This is indeed a possibility. Maybe you used the wrong mapping file ?

    Open the Calibre GUI and look at a few errors and their surroundings. See if the shapes are the same as in Innovus, in the same layer, the sizes of the features  etc.

    -Dimo

  • in reply to DimoM

    Hi Dimo,

    Thank you for your reply!

    I tried to verify the GDS on PVS and it highlighted much fewer errors. However, some of those errors are related to densities (which I will deal with later), but some other errors are about widths and spacings (which I have to solve at this stage). 

    The violated rules that I'm trying to fix now are:

    1- maximum width of metal greater than <max>

    2- minimum metal area less than <min>

    3- minimum metal width less than <min>

    4- minimum spacing between vias less than <min>

    Are there commands to variables to set before the P&R process so Innovus can avoid violating those rules?

    Kind regards,

    Anas

Reply
  • in reply to DimoM

    Hi Dimo,

    Thank you for your reply!

    I tried to verify the GDS on PVS and it highlighted much fewer errors. However, some of those errors are related to densities (which I will deal with later), but some other errors are about widths and spacings (which I have to solve at this stage). 

    The violated rules that I'm trying to fix now are:

    1- maximum width of metal greater than <max>

    2- minimum metal area less than <min>

    3- minimum metal width less than <min>

    4- minimum spacing between vias less than <min>

    Are there commands to variables to set before the P&R process so Innovus can avoid violating those rules?

    Kind regards,

    Anas

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