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:
May. 27, 2003
Filed:
Feb. 28, 2000
Stephen Larry Runyon, Pflugerville, TX (US);
Robert T. Sayah, Poughkeepsie, NY (US);
Joseph Roland Verock, Austin, TX (US);
Steven Eugene Washburn, Poughquag, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
An EQUATE property is introduced into the layout cell data for a layout design to identify the schematic to which the layout design corresponds. Rather than exploding the layout cell up to the next level for flat checking because the equivalent schematic is not known, the layout cell instances may then be checked hierarchically, with one instance checked internally for compliance with design rules and the like while the remaining instances are merely checked for proper connection to neighboring cells. New layout cell designs may therefore be created as the need arises during layout without requiring schematic checking tools to be rerun.