validPurposes

If you are using the Layout XL Connectivity Extractor, you can define the valid layer purpose pairs using the validPurposes constraint that the connectivity extractor should consider. For example:

constraintGroups(
 ; ( group                             [override] )
 ; ( -----                              --------  )
   ( "virtuosoDefaultExtractorSetup"    nil
   ;  layer constraints
      interconnect(
      ( validLayers("Metal12" "Poly")
      ( validPurposes 'include ("drawing" "pin" "net") )
      );interconnect
     );virtuosoDefaultExtractorSetup
);constraintGroups

Here, only the following layer-purpose pairs (LPP) are considered extractable:

• Metal12 drawing
• Metal12 pin
• Metal12 net
• Poly drawing
• Poly pin
• Poly net

You can also use the ‘exclude option to exclude an LPP from the valid layer purpose list, as illustrated in the example below:

constraintGroups(
 ; ( group                             [override] )
 ; ( -----                              --------  )
   ( "virtuosoDefaultExtractorSetup"    nil
   ;  layer constraints
      interconnect(
      ( validLayers("Metal12" "Poly")
      ( validPurposes 'exclude ("blockage" "boundary") )
      );interconnect
     );virtuosoDefaultExtractorSetup
);constraintGroups

For layers "Metal12" and "Poly", all purposes other than "blockage" and "boundary" are extractable.

Instead of using the ‘exclude option, you can also use the excludeLPPs constraint to specify the layer purpose pairs to be ignored for extraction.

Related Topics

validPurposes

excludeLPPs

Return to top