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:
Dec. 30, 2008
Filed:
Nov. 24, 2004
Walter A. Manaker, Jr., Boulder, CO (US);
Walter A. Manaker, Jr., Boulder, CO (US);
Xilinx, Inc., San Jose, CA (US);
Abstract
The present invention includes a method and an apparatus, in one embodiment, in the form of an integrated circuit and programmable fabric design tool, for calculating skew in a manner that does not include unnecessary skew values, resulting in a skew value without pessimism. A setup slack determination ensures that data launched or transmitted from a source register reaches the destination register within a specified maximum cycle time and is defined as the difference between a minimum (early) destination time and a maximum (late) source time without unnecessary skew values. A hold check slack determination ensures the data does not 'race' from the source register to the destination register on the same clock edge and is calculated as a difference between a maximum (late) destination time and a minimum (early) source time without unnecessary skew values. A circuit's operational frequency and layout are based upon the method for calculating skew.