发明授权
- 专利标题: Nonvolatile semiconductor memory device
- 专利标题(中): 非易失性半导体存储器件
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申请号: US14194781申请日: 2014-03-02
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公开(公告)号: US09305637B2公开(公告)日: 2016-04-05
- 发明人: Rieko Funatsuki , Takuya Futatsuyama , Fumitaka Arai
- 申请人: KABUSHIKI KAISHA TOSHIBA
- 申请人地址: JP Tokyo
- 专利权人: Kabushiki Kaisha Toshiba
- 当前专利权人: Kabushiki Kaisha Toshiba
- 当前专利权人地址: JP Tokyo
- 代理机构: Patterson & Sheridan, LLP
- 优先权: JP2013-186605 20130909
- 主分类号: G11C11/34
- IPC分类号: G11C11/34 ; G11C11/56 ; G11C16/04 ; G11C16/34
摘要:
A nonvolatile semiconductor memory device includes a memory cell array having nonvolatile memory cells in which one of multiple values is programmable therein by setting one of a plurality of threshold values therein and a control circuit that performs a writing operation on the memory cells. The writing operation performed by the control circuit includes a pre-programming verification operation to determine a threshold level of a memory cell in an erasure state, and a program operation in which a program voltage is selected from a plurality of program voltages on the basis of a determination result of the pre-programming verification operation.
公开/授权文献
- US20150070989A1 NONVOLATILE SEMICONDUCTOR MEMORY DEVICE 公开/授权日:2015-03-12
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