Wear leveling method and apparatus for nonvolatile memory
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United States of America Patent
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Issued Date -
Sep 6, 2007
app pub date -
Mar 3, 2006
filing date -
Mar 3, 2006
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Abstract
A wear leveling apparatus uniformly distributes wear over a nonvolatile memory containing a plurality of memory blocks. The wear leveling apparatus includes a memory unit for storing a record of cold block candidates in the nonvolatile memory and a control unit configured to update the memory unit and release the cold block candidates under a threshold condition. The control unit selects a new memory block to replace one cold block candidate in the memory unit when the cold block candidate is matched with a written address in a write command for the nonvolatile memory. The cold block candidates remained in the memory unit are identified as cold blocks when the nonvolatile memory has been written more than a predetermined write count threshold. The memory blocks with infrequent erasure can be identified and released to uniformly distribute wear over the nonvolatile memory.
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