Fault tolerant computer memory systems and components...

G - Physics – 06 – F

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G06F 11/22 (2006.01) G06F 11/00 (2006.01) G06F 11/10 (2006.01)

Patent

CA 2002361

FAULT TOLERANT COMPUTER MEMORY SYSTEMS AND COMPONENTS EMPLOYING DUAL LEVEL ERROR CORRECTION AND DETECTION WITH DISABLEMENT FEATURE ABSTRACT OF THE DISCLOSURE In a memory system comprising a plurality of memory units each of which possesses unit-level error correction capabilities and each of which are tied to a system level error correction function, memory reliability is enhanced by providing means for disabling the unit-level error correction capability, for example, in response to the occurrence of an uncorrectable error in one of the memory units. This counter-intuitive approach which disables an error correction function nonetheless enhances overall memory system reliability since it enables the employment of the complement/recomplement algorithm which depends upon the presence of reproducible errors for proper operation. Thus, chip level error correction systems, which are increasingly desirable at high packaging densities, are employed in a way which does not interfere with system level error correction methods.

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