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:
Jul. 09, 1996
Filed:
Dec. 23, 1993
Applicant:
Inventor:
Duy K Le, Levittown, PA (US);
Assignee:
AT&T Corp., Murray Hill, NJ (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01R / ;
U.S. Cl.
CPC ...
371 223 ; 371 251 ;
Abstract
A plurality of individual systems (12.sub.o -12.sub.n) are controlled during testing via a test value present on a four-wire Boundary-Scan port (17). To accomplish such control, the test value present at the Boundary-Scan port is shifted through at least one buffer (16.sub.A) which generates a control signal on its output lines (S.sub.o -S.sub.7 ) in accordance with the test value. The control signal from the buffer controls at least one multiplexer (18.sub.A) and demultiplexer (18.sub.A') that collectively operate to select one of the systems in accordance with the buffer control signal.