Memory system and method of controlling nonvolatile memory

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United States of America Patent

PATENT NO 9251892
SERIAL NO

14636685

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Abstract

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According to an embodiment, a controller specifies a first voltage range that has a first distribution quantity, a second voltage range that is adjacent to a lower voltage side of the first voltage range, and a third voltage range that is adjacent to a higher voltage side of the first voltage range. The first distribution quantity is a minimum value of the memory cells. The controller determines a read voltage by using the first voltage range, a first representative voltage value in the first voltage range, the first distribution quantity, a second distribution quantity corresponding to the second voltage range, and a third distribution quantity corresponding to the third voltage range.

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Patent Owner(s)

  • TOSHIBA MEMORY CORPORATION

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Asami, Shohei Yokohama, JP 26 133
Hara, Tokumasa Kawasaki, JP 112 833
Hida, Toshikatsu Yokohama, JP 130 1567
Suzuki, Riki Yokohama, JP 62 266

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