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:
Feb. 10, 1998
Filed:
Jul. 18, 1996
Applicant:
Inventors:
George A Haag, Colorado Springs, CO (US);
Patrick J Byrne, Colorado Springs, CO (US);
Assignee:
Hewlett-Packard Company, Palo Alto, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G06F / ;
U.S. Cl.
CPC ...
371 222 ;
Abstract
A method and apparatus for analyzing a programmable logic device (PLD) that provides access to internal nodes of the circuit. The method and apparatus in accordance with the present invention uses a shadow programmable logic device to emulate the target PLD while coupling input and output terminals of the shadow PLD so as to provide more information about the target PLD than can be obtained from the target PLD itself. Also, the shadow PLD can implement internal stimulus and/or response functions to provide improve analyzing capability not possible with the target PLD alone.