ROM Program security circuits

Details ROM Program security circuits ROM Program security circuits

1979-06-21

1981-05-19

Fears, Terrell W.

Static information storage and retrieval

Read only systems

Semiconductive

3072383, G11C 1700, G11C 1140

Patent

active

042689112

ABSTRACT:
Read-only memories are manufactured to include the associated microprocessor controlling program specified by, and proprietary to, the manufacturer's customers. The problem the manufacturer has of identifying each ROM and associated microprocessor with each customer is now overcome by including an assigned customer identification number in a separate small permanent register that may be read out into the data bus by an appropriate input signal. Stored program security is provided by including in the ROM test circuit a fusible link that may be opened by an appropriate signal to prevent all future readout of the customer's proprietary program.

REFERENCES:
patent: 3872450 (1975-03-01), Reynolds
patent: 4037218 (1977-07-01), Groeger et al.
patent: 4064493 (1977-12-01), Davis
patent: 4084105 (1978-04-01), Teranishi et al.

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