Semiconductor memory device

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United States of America Patent

PATENT NO 9355737
SERIAL NO

14470322

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Abstract

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A semiconductor memory device includes a block including a plurality of string units, each including a plurality of memory cells electrically connected in series, a bad string register in which information indicating which of the string units is a bad string is stored, and a control circuit. The control circuit controls an erase operation on the memory cells, the erase operation including a first erase operation followed by a first verify operation and as needed a subsequent erase operation followed by a subsequent verify operation. During the erase operation, the control circuit skips a verify operation for a string unit if the information in the bad string register indicates the string unit is a bad string.

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Patent Owner(s)

  • TOSHIBA MEMORY CORPORATION

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Shirakawa, Masanobu Chigasaki Kanagawa, JP 261 1656

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