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. 17, 1992
Filed:
Jun. 08, 1990
Michael K Benton, Malvern, PA (US);
John L Janssen, Paoli, PA (US);
Andrew T Jennings, West Chester, PA (US);
Unisys Corporation, Plymouth Meeting, PA (US);
Abstract
A memory system provides a method for error detection and correction. Large data words are divided into multiple error correction zones. One zone from each of two or more words are combined to form an error domain. Address bits are also included in the domains. Check bits are generated from the data bits in each domain and stored with the data. During data retrieval, each domain is processed separately, generating a syndrome for each domain. The syndromes provide indication of bit errors, allowing the correction of a single-bit error in each domain. Multiple-bit errors may thus be corrected within each word using a single-bit error correction code. Data are distributed in physical memory so that, within each domain, no more than one data bit is stored in the same memory device. This method provides full error correction capability in the presence of a catastrophic memory package failure, so long as failures in multiple packages do not cause multiple errors within a single error correction domain. During both read and write operations, error correction code processing may be performed in parallel for multiple domains, enhancing performance.