Flash memory refresh techniques triggered by controlled scrub data reads
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United States of America Patent
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Jan 13, 2009
Grant Date -
Oct 2, 2008
app pub date -
Mar 28, 2007
filing date -
Mar 28, 2007
priority date (Note) -
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status (Latency Note)
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Abstract
The quality of data stored in individual blocks of memory cells of a flash memory system is monitored by a scrub read of only a small portion of a block, performed after data are read from less than all of a block in response to a read command from a host or memory controller. The small portion is selected for the scrub read because of its greater vulnerability than other portions of the block to being disturbed as a result of the commanded partial block data read. This then determines, as the result of reading a small amount of data, whether at least some of the data in the block was disturbed by the command data read to a degree that makes it desirable to refresh the data of the block.
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