05831988 is referenced by 11 patents and cites 8 patents.

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.

Title
Fault isolating to a block of ROM
Application Number
8/788111
Publication Number
5831988
Application Date
January 23, 1997
Publication Date
November 3, 1998
Inventor
Gerald G Fagerness
Mazeppa
MN, US
Agent
Nawrocki Rooney & Silvertson P A
Assignee
Unisys Corporation
PA, US
IPC
G11C 29/00
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