EDAC ==>
error detection and correction
<algorithm, storage> (EDAC, or "error checking and correction", ECC) A
collection of methods to detect errors in transmitted or stored data and to
correct them. This is done in many ways, all of them involving some form of
coding. The simplest form of error detection is a single added parity bit or a
cyclic redundancy check. Multiple parity bits can not only detect that an error
has occurred, but also which bits have been inverted, and should therefore be
re-inverted to restore the original data. The more extra bits are added, the
greater the chance that multiple errors will be detectable and correctable.
Several codes can perform Single Error Correction, Double Error Detection
(SECDEC). One of the most commonly used is the Hamming code.
At the other technological extreme, cuniform texts from about 1500 B.C. which
recorded the dates when Venus was visible, were examined on the basis of
contained redundancies (the dates of appearance and disappearance were
suplemented by the length of time of visibility) and "the worst data set ever
seen" by [Huber, Zurich] was corrected.
RAM which includes EDAC circuits is known as error correcting memory (ECM).
[Wakerly, "Error Detecting Codes", North Holland 1978].
[Hamming, "Coding and Information Theory", 2nd Ed, Prentice Hall 1986].
(1995-03-14)
Nearby terms:
error « error-based testing « error correcting
memory «
error detection and correction » es » ES-1 » ESA
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