Creating regional routing blockages in integrated circuit design

摘要

A region of congestion is detected at a set of layers. The region occupies the same area of each layer in the set. A routing blockage is defined as a tuple corresponding to the region. The tuple includes a set of coordinates to describe an area of the region, a first and a second layer coordinates of a first and a second layer in the set of layers. The routing blockage is applied during an iteration of rough routing. Before an iteration of detailed routing, the routing blockage is removed. Detailed routing is performed using a g-cell in the region. The detailed routing uses a routing capacity saved in the g-cell during the iteration of rough routing due to the routing blockage. A revised IC design is produced where a revised congestion in an area corresponding to the region is reduced.

主权项

1. A method for reducing congestion using regional routing blockages in an integrated circuit (IC) design, the method comprising:
detecting, at a set of layers in the IC design, a region of congestion, such that the region occupies the same area of each layer in the set of layers; defining, as a tuple, a routing blockage corresponding to the region, wherein the tuple comprises a set of coordinates to describe an area of the region, a first layer coordinate of a first layer in the set of layers, and a second layer coordinate in the set of layers; applying, using a processor and a memory, the routing blockage during an iteration of rough routing of the IC design; removing, before a detailed routing iteration of the IC design, the routing blockage; performing detailed routing using a g-cell in the region, wherein the detailed routing uses a routing capacity saved in the g-cell during the iteration of rough routing due to the routing blockage; and outputting a revised IC design, wherein in the revised design a revised congestion in an area corresponding to the region is less than a congestion in the region in the IC design.