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:
Mar. 08, 1988
Filed:
Jul. 07, 1986
Applicant:
Inventors:
Peter L Desyllas, Wilmslow, GB;
Finbar Naven, Cheadle Hulme, GB;
Assignee:
International Computers Limited, London, GB;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01R / ;
U.S. Cl.
CPC ...
371 25 ; 371 15 ; 324 / ;
Abstract
A digital integrated circuit is described in which the internal registers are organized into a number of serial shift paths to facilitate testing. Each path has a number of modes; USER, HOLD, SHIFT and SELF-TEST modes. Shifting of a path is achieved by putting the path into HOLD mode and then, at each of a series of transfer pulses (TR), putting the path into shift mode for one clock beat. This allows the shifting to be performed at a lower rate than the internal clock rate of the chip; in particular, it can be performed at a rate compatible with a relatively slow diagnostic processor.