The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 01, 2004
Filed:
Jan. 13, 2002
Steven Teig, Menlo Park, CA (US);
Oscar Buset, Morges, CH;
Cadence Design Systems, Inc., San Jose, CA (US);
Abstract
Some embodiments provide a hierarchical method of routing nets within a particular region of a circuit layout. Each net has a set of pins. The method initially partitions the particular region into a first set of sub-regions. For each net, the method identifies a first route that connects a group of first-set sub-regions containing the first net's pins; where some of the routes have at least one route-edge that is at least partially diagonal. The method then partitions the sub-regions into a second set of smaller sub-regions. For a first net, the method identifies a propagation of the first-net's first route into the second-set sub-regions based on congestion between the second-set sub-regions. It then adjusts the congestion between the second set sub-regions based on the identified propagation. For a second net, the method then identifies a propagation of the second-net's first route into the second-set sub-regions based on congestion between the second-set sub-regions.