Architecture modification for improved ROM security

Details Architecture modification for improved ROM security Architecture modification for improved ROM security

1987-09-24

1989-06-27

Hearn, Brian E.

Fishing, trapping, and vermin destroying

437 45, 365185, H01L 21265, H01L 2170

Patent

active

048430269

ABSTRACT:
A technique of modifying a ROM mask to prevent external access of internal memory of an integrated circuit device. Patterns in the ROM mask are altered to permit implantation of components of a driver circuit such that these driver circuits are disabled. Disabling of the driver circuit prevents control signals from permitting external access of internal memory, therein allowing copy protection of the contents of the internal memory.

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patent: 4633572 (1987-01-01), Rusch et al.
patent: 4698750 (1987-10-01), Wilkie et al.

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