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. 15, 2003
Filed:
Oct. 19, 1998
Jeffery C. Brauch, Fort Collins, CO (US);
Jay E. Fleischman, Fort Collins, CO (US);
Hewlett Packard Development Company, L.P., Houston, TX (US);
Abstract
A method and apparatus for locating defects in an on-chip memory of an integrated circuit is presented. During a memory test of on-chip memory, a known data value is written to a word in the on-chip memory, and an output data value is read back from the same addressed word in memory. A comparison of the output data value and expected data value is performed within the integrated circuit, producing a comparison result indicating which of the bit cells in the addressed word have failed. The address and comparison result are transferred external to said integrated circuit and correspond to a bitmap entry in a bitmap. The execution of a full memory test results in a complete bitmap indicating all the failed cells of the on-chip memory.