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<p>A fault-detecting, bidirectional data interface between uncoded data from one component, such as a processor, and coded data in the rest of the system is described. This interface is capable of correcting a single multibit symbol error or detecting the occurrence of two such errors. The device uses a shortened Reed-Solomon code, and two practical symbol sizes are considered; nibble (4-bit) errors are protected by a (40, 32) binary equivalent shortened code, and byte errors are covered by a (80, 64) binary-sized code. The Reed-Solomon codes have maximum protection levels, even when shortened, and allow simplifying the design options. A dual orthogonal basis used for the symbols' representations provides significant hardware savings. The interface unit achieves internal fault detection by comparing regenerated parity values in a totally self-checking equality checker. A fault-tolerant ultrareliable memory module is proposed and evaluated. An illustrative design is realized using a single desktop programmable gate array.</p>
multibit correcting data interface; nibble errors; fault-tolerant systems; uncoded data; processor; shortened Reed-Solomon code; byte errors; binary-sized code; dual orthogonal basis; totally self-checking equality checker; ultrareliable memory module; single desktop programmable gate array; error correction codes; fault tolerant computing; logic arrays; Reed-Solomon codes.

G. Redinbo, D. Andaleon and L. Napolitano, Jr., "Multibit Correcting Data Interface for Fault-Tolerant Systems," in IEEE Transactions on Computers, vol. 42, no. , pp. 433-446, 1993.
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