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:
Nov. 03, 1998
Filed:
Jan. 23, 1997
Gerald G Fagerness, Mazeppa, MN (US);
Unisys Corporation, Blue Bell, PA (US);
Abstract
Apparatus for fault isolating errors in memory elements. A test 'Signature' word is obtained by successively manipulating all of the words in a memory block. A first embodiment uses serial processing and a second embodiment uses parallel processing. In either process, prior to test, a derived signature is provided, which is the same as the resulting test signature for each block if no error is detected, and which are stored in test order prior to testing. In either embodiment, after each test signature word is obtained from a block of data, the test signature word is compared bit for bit with the corresponding derived Signature word, and if the two are not identical, an error is indicated. Any block addresses which contain errors are marked in a Fault Address RAM which can be read by external equipment to avoid the use of the faulty blocks.