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. 18, 2002
Filed:
Mar. 24, 1999
Jeffrey Paul Boettler, Raleigh, NC (US);
Robert Glen Gerowitz, Raleigh, NC (US);
William Arthur Noon, Raleigh, NC (US);
Howard James Schubert, Jr., Pinehurst, NC (US);
Chad Everett Winemiller, Cary, NC (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
Stuck-at fault, shorted and open circuit conditions occurring in the differential inputs to Differential Receivers on a Large Scale Integrated (LSI) chip are detected by a test circuit arrangement fabricated on the chip. The test circuit arrangement includes Pass Gate devices operatively coupled to the differential inputs and an Exclusive NOR circuit (XNOR) coupled to the Pass Gate devices. Pull devices are coupled to the Pass Gate devices and the differential inputs. By activating the Pass Gate devices and applying a test sequence to the differential inputs, the state of the output of the XNOR circuit indicates if an open circuit, stuck-at or short exists in the inputs to the Differential Receiver.