发明名称 Nonvolatile semiconductor memory device and method for providing security for the same
摘要 An inventive nonvolatile semiconductor memory device is provided, in advance, with a column latch circuit 29 for performing a batch write operation (page latching operation, page programming operation, and verifying operation), and the column latch circuit 29 is utilized to realize a security function. The inventive memory device is further provided with a security control circuit 41 for carrying out control so that a password for deactivating the security function is stored in the column latch circuit 29 and a verifying operation is performed to determine whether the password stored in the column latch circuit 29 is identical to a security function deactivation code stored in a deactivation code storage 13. If it is determined that the password and the security function deactivation code are identical as a result of the verifying operation, the security function is deactivated.
申请公布号 US2003200406(A1) 申请公布日期 2003.10.23
申请号 US20030414004 申请日期 2003.04.16
申请人 MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. 发明人 KOUNO KAZUYUKI
分类号 G06F12/14;G11C16/22;(IPC1-7):G06F12/14 主分类号 G06F12/14
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