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:
Feb. 23, 1993
Filed:
Feb. 14, 1992
Yasuyuki Nozuyama, Tokyo, JP;
Akira Nishimura, Kanagawa, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A self-diagnostic circuit comprises a plurality logic of circuits to be diagnosed and a plurality of first and second storage circuits provided for the logic circuits respectively. The first storage circuits have outputs which indicate whether or not the corresponding logic circuits are being diagnosed. The second storage circuits stored results of diagnoses of the corresponding logic circuits. The first and second storage circuits and logic circuits have a sequential diagnostic operation mode in which logic circuits are sequentially diagnosed according to a diagnosis starting signal, and a scan operation mode in which a specific one among the logic circuits is selected and diagnosed. The scan operation mode is realized during the supply of the diagnosis starting signal and by supplying selection signals that select the specific one among the logic circuits.