Memory system having flash memory where a one-time...

Details Memory system having flash memory where a one-time... Memory system having flash memory where a one-time...

2006-04-18

2006-04-18

Dinh, Son T. (Department: 2824)

Static information storage and retrieval

Floating gate

Data security

C365S185010, C365S201000

Reexamination Certificate

active

07031188

ABSTRACT:
A memory system includes a flash memory device and an interface device. The flash memory device includes a one-time programmable block where protection data information is stored in a predetermined region, and the interface device includes a register for storing one-time programmable lock status information to indicate whether the one-time programmable block is programmed. When a program/erase command is applied externally in a one-time programmable mode, the interface device having the one-time programmable lock status information indicates whether the one-time programmable block is programmed. If the one-time programmable lock status information indicates that the one-time programmable block is programmed, the interface device cuts off an external access to the one-time programmable block.

REFERENCES:
patent: 5936890 (1999-08-01), Yeom
patent: 6204703 (2001-03-01), Kwon
patent: 6346834 (2002-02-01), Chai
patent: 6732246 (2004-05-01), Okaue
patent: 2001-035176 (2002-02-01), None
English language abstract of Japanese Publication No. 2001-035176.

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