Memory system and control method thereof
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United States of America Patent
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May 24, 2011
Grant Date -
Jun 10, 2010
app pub date -
Feb 12, 2010
filing date -
Apr 24, 2008
priority date (Note) -
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Abstract
A memory system includes a nonvolatile memory including blocks as data erase units, a measuring unit which measures an erase time at which data in each block is erased, a block controller having a block table which associates a state value indicating one of a free state and a used state with the erase time for each block, a detector which detects blocks in which rewrite has collectively occurred within a short period, a first selector which selects a free block having an old erase time as a first block, a second selector which selects a block in use having an old erase time as a second block, and a leveling unit which moves data in the second block to the first block if the first block is included in the blocks detected by the detector.
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