发明名称 |
NONVOLATILE SEMICONDUCTOR MEMORY DEVICE HAVING PROTECTION FUNCTION FOR EACH MEMORY BLOCK |
摘要 |
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.
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申请公布号 |
US2008205143(A1) |
申请公布日期 |
2008.08.28 |
申请号 |
US20080108272 |
申请日期 |
2008.04.23 |
申请人 |
TANAKA TOMOHARU;KAWAI KOICHI;QUADER KHANDKER N |
发明人 |
TANAKA TOMOHARU;KAWAI KOICHI;QUADER KHANDKER N. |
分类号 |
G06F12/14;G11C16/04;G11C16/02;G11C16/06;G11C16/22;G11C29/42;H01L21/8247;H01L27/115;H01L29/788;H01L29/792 |
主分类号 |
G06F12/14 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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