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. 01, 1997
Filed:
Oct. 17, 1995
Mitsuyasu Ohta, Osaka, JP;
Akira Motohara, Hyogo, JP;
Matsushita Electcric Industrial Co., Ltd., Osaka, JP;
Abstract
This invention is intended for a semiconductor integrated circuit with scan logical blocks wherein scan flip-flops are used for interblock signal communication. A testing sequence is generated to detect a fault in a target scan logical block. First, a block testing sequence, which is a testing sequence to the scan logical block as a single circuit, is generated. If signal inversion occurs in a scan chain that runs through the scan logical block, data that is inputted to or outputted from the scan logical block via such a scan chain is inverted. Patterns equal in number to the semiconductor integrated circuit's structure are placed in front of and behind a shift-in pattern and a shift-out pattern in the block testing sequence, to convert the block testing sequence into a testing sequence for the entire semiconductor integrated circuit. Upon completion of all the testing sequence generation with respect to the scan logical blocks, the generated testing sequences are merged.