Protection circuit for preventing unauthorized access to the...

Details Protection circuit for preventing unauthorized access to the... Protection circuit for preventing unauthorized access to the...

2006-05-30

2006-05-30

Jackson, Stephen W. (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

C361S115000

Reexamination Certificate

active

07054121

ABSTRACT:
A protection circuit (1) is coupled to a processor (2) and a memory device (3) which preferably form a physical unit, and prevents unauthorized access to the memory device (3) by combining internal and/or external signals (s2, s3, s4; s1) in a logic device (5) for detecting the unauthorized access. These signals are control signals of the processor-memory system and correspond to the status of the latter. In the event of an unauthorized memory access, the logic device (5) disables an externally accessible data interface (6) and/or inhibits the control signals (s5) necessary for access to the memory device (3).

REFERENCES:
patent: 4523271 (1985-06-01), Levien
patent: 4796235 (1989-01-01), Sparks et al.
patent: 5557743 (1996-09-01), Pombo et al.
patent: 5974500 (1999-10-01), Maletsky et al.
patent: 6397301 (2002-05-01), Quach et al.
patent: 6665782 (2003-12-01), Capps et al.

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