Longitudinal parity

Details Longitudinal parity Longitudinal parity

1980-10-06

1984-02-21

Thomas, James D.

Boots, shoes, and leggings

365200, 371 49, G06F 1100

Patent

active

044333889

ABSTRACT:
A memory system has a plurality of memory modules. A longitudinal parity word is stored in one memory module and correction words are stored in each of the other memory modules. When one of the data words in a memory module having a correction word is changed, the correction word is also changed from a prior value to a new value so that the longitudinal parity of the data in the modules is unaffected. The new value of the correction word is computed by EXCLUSIVE ORing the value of the data word before the change, the data word after the change, and the prior value of the correction word.

REFERENCES:
patent: 3814921 (1974-06-01), Nibby et al.
patent: 3838264 (1974-09-01), Maker
patent: 3887901 (1975-06-01), Moore
patent: 4016409 (1977-05-01), Kim
patent: 4038537 (1977-07-01), Cassarino, Jr. et al.
patent: 4044328 (1977-08-01), Herff
patent: 4155070 (1979-05-01), Munter
patent: 4168486 (1979-09-01), Legory
patent: 4234955 (1980-11-01), Jerimiah et al.
patent: 4282584 (1981-08-01), Brown et al.
patent: 4303993 (1981-12-01), Panepinto et al.
patent: 4304002 (1981-12-01), Hunt
patent: 4335459 (1982-06-01), Miller
patent: 4339804 (1982-07-01), Davidson et al.
patent: 4344155 (1982-08-01), Mollier
patent: 4354251 (1982-10-01), Hellwig et al.
patent: 4355393 (1982-10-01), Kubo et al.
patent: 4368532 (1983-01-01), Imazeki et al.
patent: 4371963 (1983-02-01), Edwards, Jr. et al.
patent: 4388684 (1983-06-01), Nibby, Jr. et al.
D. W. Grimes, Address Error Checker for Remote and Local Scattered Bits, IBM Tech. Discl. Bull., V. 22, pp. 456-457.
R. E. Vogelberg, Maintaining Parity in Memory Modules, IBM TDB, V. 24, pp. 4623-4624.
C. V. Freiman, Longitudinal Checks Using Transverse Parity, IBM TDB, V. 6, pp. 2-3.
R. Vierson et al., Memory Parity Checking, Xerox Disclosure Bulletin, V. 1, p. 79.
A. R. Barsness, W. H. Cochran, W. A. Lopour, & L. P. Segar, Longitudinal Parity Generation for Single-Bit Error Correction, IBM Tech. Disclos. Bulletin, vol. 24, No. 6, Nov. 1981, pp. 2769-2770.
R. H. Linton, Detection of Single Bit Failures in Memories Using Longitudinal Parity.
IBM TDB, V. 22, Hodges, 7/79, p. 336
IBM TDB, V. 21, Gladstein, 6/78, p. 256.

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