Static information storage and retrieval – Powering – Data preservation
Patent
1986-04-23
1988-05-10
Fears, Terrell W.
Static information storage and retrieval
Powering
Data preservation
365189, 371 10, 371 13, 371 21, G11C 1140, G11C 1300
Patent
active
047440627
ABSTRACT:
A semiconductor integrated circuit with a nonvolatile memory has a plurality of nonvolatile data memory elements arranged in a matrix and a means for reading data from the memory elements in accordance with an address signal which specifies a position in the matrix. A protecting data memory element for storing at least one-bit protection data is disposed in the matrix. Whether operations such as programming (i.e., writing), erasing or reading with respect to the data memory elements will be allowed or inhibited is determined in accordance with the contents of the protecting data memory element. In other words, data security in an arbitrary area of the matrix can be accomplished based on the content of the protecting data memory element.
REFERENCES:
patent: 4327410 (1982-04-01), Patel et al.
Nakamura Hideo
Sawase Terumi
Fears Terrell W.
Hitachi , Ltd.
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