ECC system supporting different-length Reed-Solomon codes whose

Details ECC system supporting different-length Reed-Solomon codes whose ECC system supporting different-length Reed-Solomon codes whose

1996-12-06

1998-06-16

Elmore, Reba I.

Excavating

371 3701, H03M 1300

Patent

active

057682968

ABSTRACT:
A Reed-Solomon error-correction coding (ECC) scheme selectively supports two different-length codes to optimize the trade-off between error performance and the amount of disk space required to store protection symbols. The encoder contains two sets of alpha multipliers; part of one set is multiplexed with the other depending on which code is being used. Also, a shift register within the encoder is selectively lengthened or shortened depending on the code. The code pair is selected so that the generator polynomial of the shorter code is a complete divisor of the generator polynomial of the longer code. Thus, one code is a sub-code of the other. Accordingly, the ECC system is able to use the same syndrome calculator for each code. The error-correction decoder uses those syndromes that correspond to the roots of the generator polynomial of the code being used.

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