Static information storage and retrieval – Hardware for storage elements – Shields
Patent
1992-11-25
1993-10-26
Popek, Joseph A.
Static information storage and retrieval
Hardware for storage elements
Shields
365 94, 257435, G11C 500
Patent
active
052572218
ABSTRACT:
A mechanism to change the functionality of a state machine used to control operation of an EPROM device. The mechanism is programmed to generate logic level signals which are input to combinatorial logic used to implement the state machine to cause the state machine to operate with a predetermined number of wait states (typically on, two or three wait states) depending on the programming applied to the mechanism. The mechanism utilizes EPROM cells which are covered by a shield so that once programmed, they cannot be erased. The programming is performed after the part has been manufactured, but before shipment to a customer who, upon receipt of the part programs the EPROM in the usual manner. The programmed EPROM can then be erased nd reprogrammed without affecting the programming defining the number of wait states generated during operation of the state machine.
REFERENCES:
patent: 4159050 (1985-05-01), Folmsbee
patent: 4530074 (1985-07-01), Folsmbee
patent: 4779229 (1988-10-01), Agrawal
patent: 4805138 (1989-02-01), McElroy
patent: 4926385 (1990-05-01), Fujishima et al.
Larsen Robert E.
Leak David A.
Salmon Joseph H.
Intel Corporation
Popek Joseph A.
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