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:
Apr. 24, 2007
Filed:
Apr. 14, 2003
Paul A. Bunce, Poughkeepsie, NY (US);
John D. Davis, Maybrook, NY (US);
Thomas J. Knips, Wappingers Falls, NY (US);
Donald Plass, Pleasant Valley, NY (US);
Paul A. Bunce, Poughkeepsie, NY (US);
John D. Davis, Maybrook, NY (US);
Thomas J. Knips, Wappingers Falls, NY (US);
Donald Plass, Pleasant Valley, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
ABIST apparatus with integrated directory compare logic functionality, and ABIST error detection functionality. The apparatus includes two subsystems NOR'ed together. The first subsystem is for bit-wise logically ANDing corresponding array valid bits and tag valid inputs, generating '0' for a match and '1' for a mis-match, and logically ORing the bit-wise result to generate a “1” hit if there are any bit-wise mismatches. The second subsystem further receives ABIST control logic as an input to either: (a). combine array valid bits tag valid inputs to produce valid output, or (b) compare array valid bits with tag valid inputs. The apparatus further includes logical NOR functionality for the outputs of the first and second subsystems.