Excavating
Patent
1982-03-30
1984-10-02
Smith, Jerry
Excavating
364200, 365200, 371 11, 371 38, G11C 1140
Patent
active
044751940
ABSTRACT:
A single error correcting memory is constructed from partially good components on the design assumption that the components are all-good. Those small number of logical lines containing double-bit errors are replaced when detected with good lines selected from a replacement area of the memory. The replacement area is provided by a flexibly dynamically deallocated portion of the main memory so that it can be selected from any section of the original memory by inserting the appropriate page address in the replacement-page register. With such a memory architecture until the first double-bit error is detected (either in testing or actual use) all pages may be used for normal data storage. When such an error is detected some temporarily unused page in the memory is deal-located, that is rendered unavailable for normal storage, and dedicated to providing substitute lines. The same procedure is followed for subsequent faults. If the replacement area itself becomes defective, a different page may be chosen to provide substitute lines simply by providing a different address in the replacement page register.
REFERENCES:
patent: 4010450 (1977-03-01), Porter et al.
patent: 4150428 (1979-04-01), Inrig et al.
patent: 4310901 (1982-01-01), Harding et al.
patent: 4376300 (1983-03-01), Tsang
LaVallee Russell W.
Ryan Philip M.
Sollitto, Jr. Vincent F.
International Business Machines - Corporation
Smith Jerry
Ungerman M.
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