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. 11, 1997
Filed:
Jun. 20, 1996
Applicant:
Inventor:
Simon A Segars, Cambridge, GB;
Assignee:
Advanced Risc Machines Limited, Cambridge, GB;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01R / ;
U.S. Cl.
CPC ...
371 223 ; 371 225 ; 371 251 ; 371 221 ; 371 24 ; 326 93 ; 326 16 ;
Abstract
An integrated circuit is described having a scan chain of the JTAG type in which there are provided a plurality of serially connected test cells 2. The test cells serve the additional function of operating during the normal operation of the integrated circuit to store signal values that are logically combined (compared) with signal values generated by the integrated circuit to yield control signals into for controlling the operation of the integrated circuit. This allows the storage capacity of the test cells to be utilised during normal operation when they would otherwise be idle.