Read-protected semiconductor program memory

Details Read-protected semiconductor program memory Read-protected semiconductor program memory

1993-09-08

1994-12-27

LaRoche, Eugene R.

Static information storage and retrieval

Read only systems

365195, 380 50, G06F 1214

Patent

active

053771370

ABSTRACT:
A read protected semi-conductor program memory that can be used for protection of read-only memories built in microhandler of microcomputers comprising a first program memory area intended for storing the program data and a second encryption memory area intended for storing encryption data. A logical operator in intercoupled with the program and encryption memory areas making thus possible, on simultaneous reading of the program and encryption memory areas, to obtain encrypted program data.

REFERENCES:
patent: 4318014 (1982-03-01), McAlister
patent: 4771462 (1988-09-01), Hannan et al.
patent: 4987595 (1991-02-01), Marino, Jr. et al.
patent: 5131091 (1992-07-01), Mizuta
IBM Technical Disclosure Bulletin, vol. 19, NO. 11, Apr. 1977, pp. 4197-4198, "Word-Line Failure Detection Circuit", by E. C. Jacobson.
Patent Abstracts of Japan, vol. 9, No. 50 (P-339), Mar. 5, 1985 & JP-A-59 188 897 (Hitachi).

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