Integrated circuit microcontroller with on-chip memory and exter

Details Integrated circuit microcontroller with on-chip memory and exter Integrated circuit microcontroller with on-chip memory and exter

1990-09-28

1993-10-05

Harrell, Robert B.

Cryptography

Key management

Having particular key generator

395425, 395575, 395800, 380 3, 3642466, 3642864, 364DIG1, 3642329, 3642328, G06F 1200, G06F 1214

Patent

active

052513041

ABSTRACT:
A data processor with memory within a single integrated circuit package provides a programmable "secure mode" of operation to selectively restrict access and protect information stored in its memory. The secure mode of operation is included in addition to a "single chip mode" wherein the data processor accesses both data and instructions strictly from within the single integrated circuit package. An "expanded mode" of operation also exists wherein the data processor may access either internal or external memory for both instructions and data. The secure mode of operation restricts accesses of instructions to memory contained within the single integrated circuit while allowing data accesses to memory either internal or external to the integrated circuit. The secure mode is accomplished by selectively isolating internal data/instruction bus transfer activity from an external data/instruction bus.

REFERENCES:
patent: 4523271 (1985-06-01), Levien
patent: 4590552 (1986-05-01), Guttag et al.
patent: 4975870 (1990-12-01), Knicely et al.
patent: 5014191 (1991-05-01), Padgaonkar et al.
patent: 5056009 (1991-10-01), Mizuta
patent: 5067077 (1991-11-01), Wakimoto et al.

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