Static information storage and retrieval – Read only systems
Patent
1981-09-18
1984-05-29
Hecker, Stuart N.
Static information storage and retrieval
Read only systems
235492, 365201, G11C 1700
Patent
active
044519036
ABSTRACT:
A method and system for encoding key product information in semiconductors is disclosed. The invention is particularly useful in connection with byte-wide memories, but also finds application in a wide range of semiconductor devices. A plurality of read only memory cells are juxtaposed on a semiconductor die with the circuitry which performs the primary function of the chip. The read only memory cells are interconnected with the primary circuit in such a manner that the information stored therein can be accessed only when such access does not interfere with the operation of the primary circuit. Important product information is stored in the ROM cells such as manufacturer, mask set, and other manufacturer-related information, as well as key circuit parameters such as supply voltages, operating currents, programming voltages, programming pulsewidths and the like.
REFERENCES:
patent: 3712537 (1973-01-01), Carita
patent: 3872452 (1975-03-01), Stoops
patent: 4344155 (1982-08-01), Mollier
Wahler, "Using Fusible Links to Apply Machine-Readable Serial Numbers to Printed-Circuit Boards," IBM Tech. Disc. Bul., vol. 20, No. 6, 11/77, p. 2286.
Hecker Stuart N.
Seeq Technology Inc.
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