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:
Sep. 26, 1989
Filed:
Aug. 03, 1987
Ichiro Tomioka, Hyogo, JP;
Kazuhiro Sakashita, Hyogo, JP;
Satoru Kishida, Hyogo, JP;
Toshiaki Hanibuchi, Hyogo, JP;
Takahiko Arakawa, Hyogo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A semiconductor integrated circuit includes cascaded asynchronous sequential logic circuits. Scanning shift registers are provided between the asynchronous sequential circuits to permit test data to be applied to the inputs of the circuits and to latch and shift out output data provided by the circuits in response to the test data. Additional gating circuitry is provided between the scanning shift registers and the inputs of the asynchronous sequential circuits to prevent new data latched into the scanning shift register from causing the asynchronous sequential circuit connected to the scanning shift register output from changing state during testing. This same additional circuitry may be used to provide pulses of controlled width and/or timing to asynchronous sequential circuit inputs in response to externally generated gating control signals.