Invention Grant
- Patent Title: Nonvolatile semiconductor memory device
- Patent Title (中): 非易失性半导体存储器件
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Application No.: US13151548Application Date: 2011-06-02
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Publication No.: US08458537B2Publication Date: 2013-06-04
- Inventor: Hiromitsu Komai
- Applicant: Hiromitsu Komai
- Applicant Address: JP Tokyo
- Assignee: Kabushiki Kaisha Toshiba
- Current Assignee: Kabushiki Kaisha Toshiba
- Current Assignee Address: JP Tokyo
- Agency: Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P.
- Priority: JP2010-127167 20100602
- Main IPC: G06F11/00
- IPC: G06F11/00 ; G11C29/00

Abstract:
According to one embodiment, a nonvolatile semiconductor memory device comprises a memory cell array, a write control circuit, a latch circuit, an address control circuit, a scan control circuit, and an address latch circuit. The write control circuit executes write and verify for each page of the memory cell array. The latch circuit holds data of the verify result. The address control circuit divides the page into zones and sequentially selects the address of each of the zones. The scan control circuit executes scan so as to count the number of fail bits in zone selected by the address control circuit and determine whether the number of fail bits is not more than the number of allowable bits. The address latch circuit holds the address of a no fail zone, out of the plurality of zones, in which the number of fail bits is 0.
Public/Granted literature
- US20110302469A1 NONVOLATILE SEMICONDUCTOR MEMORY DEVICE Public/Granted day:2011-12-08
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