Read scrub with adaptive counter management
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United States of America Patent
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Jan 24, 2017
Grant Date -
May 5, 2016
app pub date -
Oct 29, 2014
filing date -
Oct 29, 2014
priority date (Note) -
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Abstract
A number of complimentary techniques for the read scrub process using adaptive counter management are presented. In one set of techniques, in addition to maintaining a cumulative read counter for a block, a boundary word line counter can also be maintained to track the number of reads to most recently written word line or word lines of a partially written block. Another set of techniques used read count threshold values that vary with the number of program/erase cycles that a block has undergone. Further techniques involve setting the read count threshold for a closed (fully written) block based upon the number reads it experienced prior to being closed. These techniques can also be applied at a sub-block, zone level.
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