Multi-patterning (MPT) Constraints

Multi-patterning constraints listed in the table below specify the minimum required spacing between shapes on the same layer for technologies that require more than one lithography mask for any drawn layer. For constraints in this group, when the sameMask parameter is set to false (default), the constraint applies to all shapes on the same layer; when the sameMask parameter is set to true, the constraint applies to shapes on the same mask.

Constraint Description	Constraint	Constraint Parameter
Side-to-side spacing	minSpacing	sameMask true
Corner-to-corner spacing	minSpacing (PRL<0)	sameMask true
End-to-side spacing	minEndOfLineSpacing	sameMask true
End-to-end spacing	minEndOfLineSpacing	sameMask true endToEndSpace otherEndWidth
Via-to-via spacing	oaMinViaSpacing	sameMask true

Pre-coloring constraints listed below can be assigned to critical nets in the schematic view.

Constraint	Constraint Description
msSameMask	Assigns all shapes on the same routing layer to the same mask

Virtuoso Space-based Router Constraint Reference
Product Version IC23.1, June 2023