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. 03, 1994
Filed:
Jun. 03, 1991
Marsha R Moskowitz, Highland Park, NJ (US);
Eleanor Wu, Princeton, NJ (US);
AT&T Bell Laboratories, Murray Hill, NJ (US);
Abstract
Compaction of the response signals produced by separate sets of sub-circuits (12.sub.i) within a digital circuit (10) under test is accomplished by first analyzing each response signal produced by a corresponding set of sub-circuits (by way of a logic analyzer (16,18)) to determine if the response signal has a particular pattern. A pattern bit is then set in accordance with the response signal which has the particular pattern. The pattern bits are then compacted by a set of daisy-chained time compactors (20), each compactor serving to exclusively OR the pattern bit from a corresponding logic analyzer (16,18) with a compacted bit generated previously by an upstream compactor.