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:
Aug. 19, 2003
Filed:
Jul. 26, 2000
Koji Hamawaki, Osaka, JP;
Masahiro Fukui, Osaka, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
In an automatic routing/designing process of an LSI using a maze algorithm, multiple sub-regions, formed by getting a grid column partitioned by a component placed in a routing region, are extracted. And grid point availability, representing the number of grid points available for routing, is obtained for each of these sub-regions. Also, if there is any open net, then the component is vertically moved upward by one grid unit, for example, to make the net routable. If the grid point availability of a sub-region, used for routing another net, has become negative as a result of the movement of the component, then the net is rerouted to pass other sub-regions. Accordingly, even if a height constraint, for example, has been imposed on the routing region, all of the nets can be routed successfully with the constraint satisfied without increasing the number of grid points in the column direction. As a result, the number of open nets can be minimized and all of the nets are much more likely to be routed successfully.