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:
Jan. 16, 2001
Filed:
Apr. 17, 1998
Ranko Scepanovic, San Jose, CA (US);
Alexander E. Andreev, Sunnyvale, CA (US);
Elyar E. Gasanov, Moscow, RU;
Pedja Raspopovic, Cupertino, CA (US);
LSI Logic Corporation, Milpitas, CA (US);
Abstract
Net routing is optimized in an integrated circuit device by dividing an integrated circuit design with a first group of substantially parallel lines in a first direction and with a group of substantially parallel lines in a second direction, with the second direction being substantially perpendicular to the first direction. A first routing graph is formed with vertices corresponding to locations where lines in the first direction and lines in the second direction cross, and nets are globally routed as a function of the first routing graph. The integrated circuit design is further subdivided with a second group of substantially parallel lines in the first direction, and a second routing graph is formed with vertices corresponding to locations where lines in the first and second groups of substantially parallel lines in the first direction cross lines in the group of substantially parallel lines in the second direction. For a net globally routed using the first routing graph, a first local net is formed in a first fragment of the second routing graph, and the first local net is rerouted within the first fragment by computing edge penalty values for edges in the first fragment and rerouting the first local net as a function of the edge penalty values.