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:
Mar. 08, 2011
Filed:
Apr. 04, 2007
Jerry R. Burch, Portland, OR (US);
Robert F. Damiano, Lake Oswego, OR (US);
Pei-hsin Ho, Portland, OR (US);
James H. Kukula, Hillsboro, OR (US);
Jerry R. Burch, Portland, OR (US);
Robert F. Damiano, Lake Oswego, OR (US);
Pei-Hsin Ho, Portland, OR (US);
James H. Kukula, Hillsboro, OR (US);
Synopsys, Inc., Mountain View, CA (US);
Abstract
One embodiment of the present invention provides a system that routes a set of pairs of points during the design of an integrated circuit (IC) chip. The system comprises a routing engine which is configured to search for a path to connect a current pair of points in the set of pairs of points, wherein the path comprises a set of rectangles and vertices. The routing engine uses a routing database, which keeps track of previously routed nets that can obstruct the routing of the current pair of points. The system further comprises a satisfiability (SAT) solver which is capable of solving a set of constraints, wherein the set of constraints are associated with the routability of the set of pairs of points. The SAT solver additionally comprises a SAT database which maintains the set of constraints and a current partial solution to the set of constraints. The SAT database is used to update the routing database if the current partial solution changes.