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. 20, 2004
Filed:
Sep. 29, 2000
Robert Glen Gerowitz, Raleigh, NC (US);
Benjamin Edward Floering, Durham, NC (US);
Kenneth Patrick Zabrycki, Durham, NC (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
Scan chains are designed for an IC based on test coverage for functional logic units, Before physical placement the scan circuit elements are assigned scan attributes which define which scan circuit elements must remain coupled and also defines which groups of scan circuit elements must remain in selected groups. The scan chains and the logic are physically placed and location data on the scan circuit elements are determined from the placement data. Using the scan attributes, single scan circuit elements and scan circuit elements that must remain connected (sub-scan chains) are re-allocated across a same number of new scan chains. These scan circuit elements are rewired using an algorithm that minimizes scan path lengths within the new scan chains.