Support for Net PROs in Virtuoso Floorplanner

A net process rule override (PRO) is a constraint defined on a specific net to override the generic foundry and design process rules on that net. Use either the Process Rule Editor or the Constraint Manager to define net PROs.

The following image shows how to define a net PRO using the Process Rule Editor.

The following image shows how to define a net PRO using the Constraint Manager.

The following process rule overrides are supported on nets:

• Minimum Spacing Same Layer override on the pin net, which defines the minimum space around each pin.
• Minimum Width override on the pin net, which defines the minimum width of pins.
• Valid Layers override on the pin net, which specifies the layers on which the pins belonging to the net can be placed. There can either be a single layer or a list of valid layers. A net PRO can be defined for both top-level (level-0) and soft block (level-1) nets.
  Top-level nets: If a net PRO is defined for a connected top-level net, then the pins are driven by these net PRO values. Soft block nets: A net PRO defined for a connected soft block net has a higher priority than that defined for a connected top-level net. Therefore, the net PRO values of the connected top-level net are applied only when there are no net PROs definitions for the soft block net.