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Spaced-based router

Automatic routing is producing many DRC errors by not aligning wires with pins and/or vias. I've tried every routing setting/technology file constraint to prevent this but am at a loss. Any ideas? Thanks, Brian

Quek over 14 years ago

Hi Brian

Adding drc constraints in the Virtuoso techfile is the correct approach so the problem should be resolved if the right constraints have been added. You can also try using the latest version of VSR (IC615.72) and see if the same problem occurs. May I know the version of VSR which you are using.

terminal>virtuoso -W

Best regards
Quek
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brianzimmer over 14 years ago

My version is: sub-version IC6.1.4.500.9 I tried adding various constraints myself pertaining to edge width, but nothing seemed to prevent this. Do you have any idea what rule would prevent something like this?
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Quek over 14 years ago

Hi Brian

Would you please post the specific DRC message for the shapes which you have uploaded? Previously I had resolved similar errors using minEdgeAdjacentDistance constraint. You can look it up in $CDSHOME/doc/asciitechfile/asciitechfile.pdf.

Best regards
Quek
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brianzimmer over 14 years ago

Here is the message: M1 vertex must not be connected to two short edges with length
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Quek over 14 years ago

Would you please try to add minEdgeAdjacentLength and see if it resolves the problem? If you already have this constraint in the techfile, then it might be good to see if VSR615 makes a difference.
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