Data protection for non-volatile semiconductor memory using...

Details Data protection for non-volatile semiconductor memory using... Data protection for non-volatile semiconductor memory using...

2008-09-02

2008-09-02

Lane, Jack A (Department: 2185)

Electrical computers and digital processing systems: memory

Storage accessing and control

Specific memory composition

C711S152000, C711S163000, C365S195000, C365S185040

Reexamination Certificate

active

11454797

ABSTRACT:
Receiving a request for canceling setting, a control circuit erases data stored in a corresponding block, changes a value of a protection flag, and cancels protection setting. When an overall protection is set for any block, the control circuit prohibits access to all blocks, except when it is an operation mode for activating a memory program contained in the microcomputer. Further, control circuit permits an access to a block M only when partial protection is set, CPU is in the mode for activating a memory program contained in the microcomputer and the access is for reading an instruction code in accordance with an instruction fetch.

REFERENCES:
patent: 6154819 (2000-11-01), Larsen et al.
patent: 2003/0023822 (2003-01-01), Scott et al.
patent: 2004/0049645 (2004-03-01), Lee et al.
patent: 11-120781 (1999-04-01), None
patent: 2001-014871 (2001-01-01), None
patent: 2003-203012 (2003-07-01), None

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