Flash channel with selective decoder likelihood dampening
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United States of America Patent
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Oct 30, 2015
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Nov 28, 2013
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Abstract
An apparatus for reading a flash memory includes a read controller operable to read the flash memory to yield read patterns, a likelihood generator operable to map the read patterns to likelihood values, a decoder operable to decode the likelihood values, a data state storage operable to retrieve the likelihood values for which decoding failed, and a selective dampening controller operable to select at least one dampening candidate from among the likelihood values for which decoding failed, to dampen the likelihood values of the at least one dampening candidate to yield dampened likelihood values, and to provide the dampened likelihood values to the decoder for decoding.
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