Nonvolatile semiconductor memory device and method for providing security for the same
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United States of America Patent
Stats
-
Feb 7, 2006
Grant Date -
Oct 23, 2003
app pub date -
Apr 16, 2003
filing date -
Apr 17, 2002
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
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.
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