Selectable block protection for non-volatile memory

Details Selectable block protection for non-volatile memory Selectable block protection for non-volatile memory

2007-09-25

2007-09-25

Song, Jasmine (Department: 2188)

Electrical computers and digital processing systems: memory

Storage accessing and control

Specific memory composition

C711S163000, C365S185330, C365S185290, C365S195000

Reexamination Certificate

active

11457611

ABSTRACT:
A semiconductor non-volatile memory device, particularly a flash memory array, having a chip configuration with a plurality of pins including a write protect pin, a serial in pin and an optional parallel data bus with input-output pins (I/O7-0), plus other pins, all electrically communicating with the memory array and particularly a sector protection register of variable size and location. The sector protection register defines which sectors or group of sub-sectors to protect and is controlled by the use of commands via the serial in pin or the optional input-output pins. The sector protection may be selectably controlled by either use of a signal to the write protect pin or use of commands via the serial in pin or the optional input-output pins to the command and control logic. A logic circuit instantly determines whether the write protect pin or the commands are controlling the sector protection.

REFERENCES:
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patent: 6330648 (2001-12-01), Wambach et al.
patent: 2002/0007437 (2002-01-01), Chan et al.

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