Familial correction with non-familial double bit error detection

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United States of America Patent

PATENT NO 7634709
APP PUB NO 20030070133A1
SERIAL NO

09972490

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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Error correction and error detection related to DRAM chip failures, particularly adapted server memory subsystems. It uses ×4 bit DRAM devices organized in a code word of 128 data bit words and 16 check bits. These 16 check bits are generated in such a way as to provide a code capable of 4 bit adjacent error correction within a family (i.e., in a ×4 DRAM) and double bit non-adjacent error detection across the entire 128 bit word, with single bit correction across the word as well. Each device can be thought of as a separate family of bits, errors occurring in more than one family are not correctable, but may be detected if only one bit in each of two families is in error. Syndrome generation and regeneration are used together with a specific large code word. Decoding the syndrome and checking it against the regenerated syndrome yield data sufficient for providing the features described.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
UNISYS CORPORATIONBLUE BELL, PA1332

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Bauman, Mitchell A Circle Pines , US 49 1149
Rodi, Eugene A Minneapolis , US 14 241

Cited Art Landscape

Patent Info (Count) # Cites Year
 
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ADVANCED MICRO DEVICES, INC. (1)
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MAXTOR CORPORATION (1)
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ADAPTEC, INC. (1)
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HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P. (1)
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RENESAS ELECTRONICS CORPORATION (1)
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SUN MICROSYSTEMS, INC. (1)
* 5781568 Error detection and correction method and apparatus for computer memory 10 1997
 
ORACLE AMERICA, INC. (1)
* 6574746 System and method for improving multi-bit error protection in computer memory systems 11 1999
* Cited By Examiner

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY, LTD. (1)
* 9654146 Bi-directional parity bit generator circuit 0 2015
 
SAMSUNG ELECTRONICS CO., LTD. (1)
9786387 Semiconductor memory devices, memory systems including the same and method of correcting errors in the same 0 2015
 
INDUSTRY-ACADEMIC COOPERATION FOUNDATION, YONSEI UNIVERSITY (1)
9800271 Error correction and decoding 0 2015
* Cited By Examiner

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