Security circuit for protecting data stored in memory

Details Security circuit for protecting data stored in memory Security circuit for protecting data stored in memory

1993-10-27

1994-10-18

Fears, Terrell W.

Static information storage and retrieval

Read/write circuit

Having particular data buffer or latch

36518901, G11C 1300

Patent

active

053574672

ABSTRACT:
A memory stores data, the contents of which must be kept secret. A memory stores security data and a latch circuit latches key data for releasing the security. A comparison circuit compares security data with key data, outputs a coincidence signal when they coincide with each other and outputs a non-coincidence signal when they do not coincide with each other. When a coincidence signal is output from the comparison circuit, an output signal of a change bit control circuit is set to the "0" level and address changing circuits change an address signal for reading out data from the memory according to the security data supplied from the memory.

REFERENCES:
patent: 4757533 (1988-07-01), Allen et al.
patent: 5081675 (1992-01-01), Kittirutsunetorn

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