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:
Apr. 13, 1999
Filed:
Aug. 06, 1997
Kyotaro Nakamura, Tokyo, JP;
Oki Electric Industry Co., Ltd., Tokyo, JP;
Abstract
A semiconductor integrated circuit is activated to allow a plurality of FFs 1 incorporated therein to latch data therein. Thereafter, the semiconductor integrated circuit is switched to test mode connections. Upon the test mode connections, for example, FFs are connected in plural stages to form scan paths 101 through 10m and scan paths 111 through 11m paired up therewith. When expected values corresponding to data latched in the scan paths 101 through 10m of the other of the pair are written into the scan paths 111 through 11m of one of the pair, respectively and they are shift-operated, exclusive OR circuits 121 through 12m successively compare the latched data and the expected values. Further, an OR circuit 13 successively outputs data indicative of whether or not the semiconductor integrated circuit works normally. Insofar as the latched data and the expected values coincide with each other, the OR circuit 13 outputs '0'.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile