Non-volatile memory and method with post-write read and adaptive re-write to manage errors
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United States of America Patent
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Apr 16, 2013
Grant Date -
Apr 28, 2011
app pub date -
Dec 18, 2009
filing date -
Oct 28, 2009
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Abstract
Data errors in non-volatile memory inevitably increase with usage and with higher density of bits stored per cell. The memory is configured to have a first portion operating with less error but of lower density storage, and a second portion operating with a higher density but less robust storage. Input data is written and staged in the first portion before being copied to the second portion. An error management provides checking the quality of the copied data for excessive error bits. The copying and checking are repeated on a different location in the second portion until either a predetermined quality is satisfied or the number or repeats exceeds a predetermined limit. The error management is not started when a memory is new with little or no errors, but started after the memory has aged to a predetermined amount as determined by the number of erase/program cycling its has experienced.
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