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:
Jan. 21, 1986
Filed:
Oct. 26, 1983
Applicant:
Inventors:
Assignee:
International Computers Limited, London, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01R / ;
U.S. Cl.
CPC ...
371 15 ; 324 / ;
Abstract
A large-scale integrated circuit chip includes a plurality of bistables connected to combinational logic. In a diagnostic mode, the bistables are operated as a serial shift register, allowing test data to be shifted through the chip between diagnostic input and output pins (LPIN,LPOUT). In a chip test mode, the serial shift register is split into a number of shift register portions, each of which is connected between a separate pair of input and output pins. This allows test data to be shifted through all the shift register portions in parallel so as to speed up testing of the chip.