Method for decoding data in non-volatile storage using reliability metrics based on multiple reads
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United States of America Patent
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Jun 18, 2013
Grant Date -
Jun 2, 2011
app pub date -
Feb 10, 2011
filing date -
Mar 29, 2007
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Abstract
Data stored in non-volatile storage is decoded using iterative probabilistic decoding and multiple read operations to achieve greater reliability. An error correcting code such as a low density parity check code may be used. In one approach, initial reliability metrics, such as logarithmic likelihood ratios, are used in decoding read data of a set of non-volatile storage element. The decoding attempts to converge by adjusting the reliability metrics for bits in code words which represent the sensed state. If convergence does not occur, e.g., within a set time period, the state of the non-volatile storage element is sensed again, current values of the reliability metrics in the decoder are adjusted, and the decoding again attempts to converge.
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