Write Protection for a non-volatile memory

Details Write Protection for a non-volatile memory Write Protection for a non-volatile memory

1998-08-28

1999-06-15

Mai, Son

Static information storage and retrieval

Read/write circuit

Signals

365145, G11C 700

Patent

active

059128496

ABSTRACT:
A semiconductor memory device, divided into plural blocks, comprising: a memory array having a non-volatile memory element which makes the read cycle and the write cycle to be substantially equivalent; plural storage elements storing the information of write protection/permission corresponding to each said block respectively; and a setting circuit to set the information of write protection/permission to said plural storage elements, wherein said setting circuit sets the write-protection information to said plural storage elements at the write cycle after designated plural read cycles. Therefore, the write protection/permission can be set by the unit of block, block by block, so that the write-protected ROM and the RAM can be set freely. Furthermore, the complexity of the setting procedure of write protection/permission may prevent the accidental false setting caused by a system runaway and so forth.

REFERENCES:
patent: 5363334 (1994-11-01), Alexander et al.
patent: 5396471 (1995-03-01), Kitsu
patent: 5467081 (1995-11-01), Drews et al.
patent: 5488587 (1996-01-01), Fukumoto
patent: 5513136 (1996-04-01), Fandrich et al.
patent: 5668760 (1997-09-01), Hazen
patent: 5802583 (1998-09-01), Yeager et al.

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