Encoding scheme for failure detection in random access memories

Details Encoding scheme for failure detection in random access memories Encoding scheme for failure detection in random access memories

G - Physics

06

F

354/224

G06F 11/10 (2006.01)

Patent

CA 1060123

ENCODING SCHEME FOR FAILURE DETECTION IN RANDOM ACCESS MEMORIES ABSTRACT A virtual encoding scheme for use in random access memories is disclosed. Data errors, incorrect memory word access errors, and errors resulting from multiple memory word access are all detectable through use of the encoding scheme. The novel approach includes the generation of two distinct check code fields which are stored along with the data. A first check code field is generated as a function of the data and is cap- able of reflecting all unidirectional data failures. A second check code field is generated as a function of the address of the memory word containing the data and is capable of reflecting incorrect memory word access. The two check fields can be stored either in the same physical memory location as the data or in a supplementary memory at an address numerically identical to that at which the data is kept. During readout, the two check fields are regenerated and compared to those previously stored.

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