Data recovery on cluster failures and ECC enhancements with code word interleaving
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United States of America Patent
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Aug 4, 2015
Grant Date -
Jun 12, 2014
app pub date -
Jan 30, 2013
filing date -
Dec 11, 2012
priority date (Note) -
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Abstract
Techniques are presented for dealing with errors that arise from cluster fails, where a number of memory cells in the same area fail. An ECC code word can tolerate a given total amount of error while still being able to still be decoded, so that if error due to clusters can be identified and removed or lessened, it may be possible to still decode the word not otherwise decodable. After identifying possible error bit cluster locations, one or more bits in the cluster locations are flipped to see if the data content of the code word can be extracted. For embodiments using LDPC ECC code, uncertainty can be added for the bits of a suspected cluster location. To reduce the effects of cluster failures, code words can be interleaved within a page and the difference code words can have differing levels of ECC capability.
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