Error correcting code for 8-bit-per-chip memory with reduced red

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371 37, G06F 1110

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048624632

ABSTRACT:
A reduced redundancy error correction and detection code is shown for memory organized with several bits of the data word on each chip. This package error correction and detection will correct all errors on any one chip and detect errors on more than one chip. A certain arrangement of an ECC matrix is first created for a symbol size code greater than the number of bits per chip. Thereafter certain columns of the matrix are removed to create the final code having a symbol size the same as the number of bits per chip. A specific example of an 80 bit code word is shown having 66 data bits and 14 check bits for a 4-bit-per-chip memory.

REFERENCES:
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patent: 3629824 (1971-12-01), Bossen
patent: 3634821 (1972-01-01), Bossen
patent: 3745525 (1973-07-01), Hong
patent: 3755779 (1973-08-01), Price
patent: 4464753 (1984-08-01), Chen
patent: 4509172 (1985-04-01), Chen
patent: 4617664 (1986-10-01), Aichelmann
patent: 4651321 (1987-03-01), Woffinden et al.
patent: 4661955 (1987-04-01), Arlington et al.
patent: 4713816 (1987-12-01), Van Gils
IBM Technical Disclosure Bulletin Article: vol. 22, No. 6, Nov. 1979; "SEC-DED Codes with Package Error Detection Ability"; by C. L. Chen, pp. 2356-2359.
Ibid. vol. 24, No. 10, Mar. 1982, "Optimized Error Correction/Detection for Chips . . . By-1", by W. H. Cochran et al, pp. 5275-5276.
Ibid. vol. 28, No. 1, Jun. 1985, "Dual Mode Error Correction and Detection", by C. L. Chen, pp. 55-58.

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