Invention Application
WO2005031754A1 NONVOLATILE SEMICONDUCTOR MEMORY DEVICE HAVING PROTECTION FUNCTION FOR EACH MEMORY BLOCK
审中-公开
具有每个存储块的保护功能的非线性半导体存储器件
- Patent Title: NONVOLATILE SEMICONDUCTOR MEMORY DEVICE HAVING PROTECTION FUNCTION FOR EACH MEMORY BLOCK
- Patent Title (中): 具有每个存储块的保护功能的非线性半导体存储器件
-
Application No.: PCT/JP2004/012419Application Date: 2004-08-23
-
Publication No.: WO2005031754A1Publication Date: 2005-04-07
- Inventor: TANAKA, Tomoharu , KAWAI, Koichi , QUADER, Khandker, N.
- Applicant: KABUSHIKI KAISHA TOSHIBA , SanDisk Corporation , TANAKA, Tomoharu , KAWAI, Koichi , QUADER, Khandker, N.
- Applicant Address: 1-1, Shibaura 1-chome, Minato-ku, Tokyo, 1058001 JP
- Assignee: KABUSHIKI KAISHA TOSHIBA,SanDisk Corporation,TANAKA, Tomoharu,KAWAI, Koichi,QUADER, Khandker, N.
- Current Assignee: KABUSHIKI KAISHA TOSHIBA,SanDisk Corporation,TANAKA, Tomoharu,KAWAI, Koichi,QUADER, Khandker, N.
- Current Assignee Address: 1-1, Shibaura 1-chome, Minato-ku, Tokyo, 1058001 JP
- Agency: SUZUYE, Takehiko
- Priority: JP2003-336058 20030926
- Main IPC: G11C16/22
- IPC: G11C16/22
Abstract:
A nonvolatile semiconductor memory device includes a memory cell array constituted by a plurality of memory blocks, an interface, a write circuit, and a read circuit. A protect flag is written in the memory block. The readout protect flag can be output to an external device through the interface. When a write command is input from the interface, the write circuit executes the write command when the protect flag in the selected memory block has a first value and does not execute the write command when the protect flag has a second value.
Information query
