DECODING METHOD, MEMORY STORAGE DEVICE AND MEMORY CONTROL CIRCUIT UNIT
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United States of America Patent
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Dec 1, 2016
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Aug 5, 2015
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May 29, 2015
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Abstract
A decoding method, a memory storage device and a memory control circuit unit are provided. The method includes: reading a plurality of first memory cells according to a first soft-decision read voltage level to obtain a first soft-decision coding unit belonging to a block code; performing a first soft-decision decoding procedure for the first soft-decision coding unit; if the first soft-decision decoding procedure fails, reading the first memory cells according to a second soft-decision read voltage level to obtain a second soft-decision coding unit belonging to the block code, where a difference value between the first soft-decision read voltage level and the second soft-decision read voltage level is related to a wear degree of the first memory cells; and performing a second soft-decision decoding procedure for the second soft-decision coding unit. Accordingly, a decoding efficiency of block codes may be improved.
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