One embodiment of the invention is a recursive partitioning method that place circuit elements in an IC layout. This method initially defines a number of partitioning lines that divide an IC region into several sub-regions (also called slots) for a net in the region, the method then identifies the set...http://www.google.de/patents/US6651233?utm_source=gb-gplus-sharePatent US6651233 - Method and apparatus for measuring congestion in a partitioned region