Invention Grant
- Patent Title: Semiconductor memory device and data write method thereof
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Application No.: US15134004Application Date: 2016-04-20
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Publication No.: US09754662B2Publication Date: 2017-09-05
- Inventor: Yukio Komatsu
- Applicant: Toshiba Memory Corporation
- Applicant Address: JP Minato-ku
- Assignee: TOSHIBA MEMORY CORPORATION
- Current Assignee: TOSHIBA MEMORY CORPORATION
- Current Assignee Address: JP Minato-ku
- Agency: Oblon, McClelland, Maier & Neustadt, L.L.P.
- Priority: JP2008-230295 20080908
- Main IPC: G11C16/04
- IPC: G11C16/04 ; G11C11/56 ; G11C16/34 ; G11C16/10 ; G11C16/24

Abstract:
A semiconductor memory device includes a control circuit. The control circuit executes control to perform a verify operation with respect to only a lowest threshold voltage level of a memory cell at a time of a data write operation, and to skip the verify operation with respect to the other threshold voltage levels. The control circuit determines whether a verify pass bit number of the lowest threshold voltage level, which is counted by a bit scan circuit, is a prescribed bit number or more, and the control circuit further executes control, if the verify pass bit number is the prescribed bit number or more, to perform the verify operation with respect to only the lowest threshold voltage level and a threshold voltage level that is higher than the lowest threshold voltage level, and to skip the verify operation with respect to the other threshold voltage levels.
Public/Granted literature
- US20160232967A1 SEMICONDUCTOR MEMORY DEVICE AND DATA WRITE METHOD THEREOF Public/Granted day:2016-08-11
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