Electrical computers and digital processing systems: memory – Storage accessing and control – Control technique
Reexamination Certificate
2008-04-15
2008-04-15
Lane, Jack (Department: 2185)
Electrical computers and digital processing systems: memory
Storage accessing and control
Control technique
C711S103000, C711S152000, C365S185040, C365S195000, C713S185000
Reexamination Certificate
active
07360049
ABSTRACT:
In a nonvolatile semiconductor memory device according to the present invention, a password protection function is enabled or disabled based on a first specified value M and a second state specified value P such that when both of the first specified value M and the second state specified value P are in a set state, the password protection function is enabled and when at least the second specified value P is in a reset state, the password protection function is disabled, and the first state specified value M maintains a previous state and the second state specified value P follows the state of the first state specified value M in response to a reset operation, and the cancel operation to shift the second state specified value P to the reset state can be performed only when the password is inputted correctly.
REFERENCES:
patent: 5206938 (1993-04-01), Fujioka
patent: 6320787 (2001-11-01), Ikeda
patent: 6731536 (2004-05-01), McClain et al.
patent: 2006/0090053 (2006-04-01), Boning
patent: 9-69067 (1997-03-01), None
Lane Jack
Morrison & Foerster / LLP
Sharp Kabushiki Kaisha
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