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. 22, 1992
Filed:
Mar. 22, 1991
Applicant:
Inventors:
Takeshi Hashizume, Hyogo, JP;
Kazuhiro Sakashita, Hyogo, JP;
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01R / ;
U.S. Cl.
CPC ...
3241 / ; 371 223 ;
Abstract
Three shift path circuits (10', 20', 30') each comprising a bypass circuit are connected in series between a test data input (TDI) and a test data output (TDO). Each shift path circuit constitutes a design definition test data register connected to a circuit to be tested. Design modification of a testing circuit can be minimized by selectively operating the bypass circuit provided in a shift path circuit, even if there is circuit modification in the circuit to be tested. The period of time required for testing circuits to be tested is reduced.