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:
Jun. 25, 1996
Filed:
Oct. 05, 1995
Applicant:
Inventors:
Don D Josephson, Fort Collins, CO (US);
Barry J Arnold, Fort Collins, CO (US);
Assignee:
Hewlett-Packard Company, Palo Alto, CA (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06F / ; H04B / ;
U.S. Cl.
CPC ...
371 223 ; 371 221 ; 371 222 ; 371 224 ; 371 225 ; 371 226 ; 307407 ;
Abstract
A test system for a digital integrated circuit in which internal states of the integrated circuit are captured non-destructively while the digital circuit is operating at normal clock speed. Cells for capturing states are sequentially connected into shift registers. Once internal states are latched within cells, the captured states are serially shifted out a test port while the integrated circuit continues to operate. State sampling is triggered internally via a software command or externally via an external signal synchronized to an internal clock.