Memory protection circuit

Details Memory protection circuit Memory protection circuit

1988-10-20

1990-01-30

Fears, Terrell W.

Static information storage and retrieval

Addressing

Particular decoder or driver circuit

36518901, G11C 1140

Patent

active

048978191

ABSTRACT:
A memory protection circuit is provided which prevents data stored in a programmable memory from being destroyed due to uncontrolled operations or malfunction of a writing unit. The memory protection circuit comprises a first decoder for detecting first predetermined data from write data, a second decoder for detecting second predetermined data out of address data which is associated with the write data, and a latch for latching a detection output of the first decoder when both a detection output of the second decoder and a write command signal exist, and for selectively allowing and inhibiting the write data from being written in a memory based on the information being latched.

REFERENCES:
patent: 4739497 (1988-04-01), Itoh et al.

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