Patent
1995-08-28
1998-02-24
Swann, Tod R.
395481, G06F 1214
Patent
active
057218722
ABSTRACT:
An information processing apparatus with a write protection function for a target storage area is provided, which includes a holding section for a write enable flag for indicating whether writing is to be permitted to the target storage area, and a write control section for permitting an intended write operation to the target storage area when the write enable flag held by the holding section indicates the same is to be permitted. The apparatus further includes a setting section for setting the write enable flag in the holding section when a dummy write instruction is executed for a command address, and a resetting section for resetting the write enable flag in the holding section when the intended write operation to the target storage area is executed. The resetting section may further include a section for resetting the write enable flag in the holding section when a predetermined number of instructions or bus cycles are executed after the dummy write instruction.
REFERENCES:
patent: 4332009 (1982-05-01), Gerson
patent: 4388695 (1983-06-01), Heinemann
patent: 4665506 (1987-05-01), Cline
patent: 5119336 (1992-06-01), Hoh
patent: 5457789 (1995-10-01), Dietrich
Chow Christopher S.
NEC Corporation
Swann Tod R.
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