Static information storage and retrieval – Read/write circuit – With shift register
Patent
1994-12-29
1997-09-23
Nelms, David C.
Static information storage and retrieval
Read/write circuit
With shift register
365201, 3652257, 365226, 371 222, G11C 700, G01R 3128
Patent
active
056711832
ABSTRACT:
A System and method for calibrating a chip after packaging including providing a packaged chip, providing programmable non-volatile storage having a plurality of non-volatile storage elements in the chip and providing a volatile storage having a plurality of volatile storage elements in the chip with one volatile storage element associated with one non-volatile storage element. The chip includes circuitry responsive to a predetermined signal to permit the non-volatile storage to be programmed in accordance with data stored in the volatile storage and to a predetermined signal to prevent external alteration of the non-volatile storage. The non-volatile storage is preferably a plurality of fuses. The volatile storage is preferably a shift register. The circuitry in the chip includes a bistable device responsive to the predetermined signal to assume a first condition to permit the non-volatile storage to be programmed and responsive to the alteration of the predetermined signal to assume a second condition which does not allow alteration of data. The system further includes a non-volatile storage element settable to one of a first or a second condition and preset to the first condition, the circuitry in the chip responsive to the first condition to permit the non-volatile storage to be programmed in accordance with data stored in the storage and responsive to the second condition to prevent external alteration of the non-volatile storage. The condition of the non-volatile element determines whether or not the first state (program) of the bistable device can be entered.
REFERENCES:
patent: 4855954 (1989-08-01), Turner et al.
patent: 5235335 (1993-08-01), Hester et al.
patent: 5353028 (1994-10-01), deWit et al.
DeWit Michiel
Soenen Eric G.
Yung Henry Tin-Hang
Brady III Wade James
Donaldson Richard L.
Holland Robby T.
Nelms David C.
Phan Trong
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