ROM security circuit

Details ROM security circuit ROM security circuit

1981-11-12

1985-04-23

Chan, Eddie P.

Boots, shoes, and leggings

G06F 1300, G06F 700

Patent

active

045133891

ABSTRACT:
A control circuit to disable the operation of a semiconductor microprocessor memory device in the event of an unauthorized attempt to access the memory. A logic circuit generates a control signal in response to receiving a predetermined binary bit pattern of a plurality of chip select signals. The control signal enables the memory device for operation. If the binary bit pattern is not presented, the memory device is disabled for operation.

REFERENCES:
patent: 3736569 (1973-05-01), Bouricius et al.
patent: 4089052 (1978-05-01), Gruner
patent: 4124893 (1978-11-01), Joyce et al.
patent: 4139893 (1979-02-01), Doland
patent: 4268911 (1981-05-01), Bell
patent: 4332009 (1982-05-01), Gerson
patent: 4384326 (1983-05-01), Devchoudhury

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