Support for EXCEPTPGNET LEF Attribute

The EXCEPTPGNET lef attribute is mapped to the OA attribute allowPGNet of oaLayerBlockage object. To support the EXCEPTPGNET LEF attribute in LEF5.8, the following bin specific option has been added in Abstract Generator.

absSetBinOption( "Core" "AbstractBlockageEXCEPTPGNET" "Metal1 Metal2")

When the AbstractBlockageEXCEPTPGNET option is set as specified in the above example, then all the blockages generated by Abstract on Metal1 and Metal2 will have EXCEPTPGNET lef attribute in the lef file.

This option is set for the blocks that want to block routing on a given layer except for power and ground routing. This is usually true for analog or memory blocks that are sensitive to noise, and do not want to allow signal routing on the layers immediately above the block as the intention is to allow power routing on the layers.

Related Topics

Abstract Generator Options for Layout Dual View

Create – Cellview – From Cellview