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US 8,015,347 B2Granted
Memory system and control method thereof
AssigneeKabushiki Kaisha Toshiba
InventorsKazuya Kitsunai, Shinichi Kanno, Hirokuni Yano, Toshikatsu Hida, Junji Yano
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Abstract
A memory system includes a nonvolatile memory including a plurality of blocks as data erase units, a measuring unit which measures an erase time at which data of each block is erased, and a block controller which writes data supplied from at least an exterior into a first block which is set in a free state and whose erase time is oldest.
Claims21
A memory system comprising:
- a nonvolatile memory including a plurality of blocks as data erase units;
- a measuring unit which measures an erase time at which data of each block is erased;
- a block controller which writes data supplied from at least an exterior into a first block which is set in a free state and whose erase time is oldest, wherein the block controller has a block table indicating a correspondence relation between a status value indicating one of a free state and an in-use state and the erase time for each block;
- and
- a first selector which selects the first block based on information of the block table.
2 more elements
A memory system comprising:
- a nonvolatile memory including a plurality of blocks as data erase units;
- a measuring unit which measures an erase time at which data of each block is erased;
- a block controller which counts an erase count of each block, and has a block table indicating a correspondence relation between a status value indicating one of a free state and an in-use state, the erase time and the erase count for each block;
- and
- a first selector which selects a first block whose erase count is minimum among a preset number of blocks set in the free state starting from a block whose erase time is oldest based on information of the block table,
- wherein the block controller writes data supplied from at least an exterior into the first block.
3 more elements
Dependencies are inferred from the claim text.