Protection circuit for preventing unauthorized access to the memory device of a processor
AssigneeMicronas GmbH
InventorDietmar Koschella
Life of this patent
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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).
Claims11
A protection circuit (1) which is coupled to a processor (2) and a memory device (3), and prevents unauthorized access to the memory device (3), wherein in order to detect an unauthorized memory access, internal and external signals (s2, s3, s4;
- s1) serving to control the processor (2) and the memory device (3) or signaling the respective operational status of the processor (2) and the memory device are applied to a logic device (5), and wherein, if an unauthorized memory access is detected, the logic device (5) will inhibit the unauthorized memory access.
Dependencies are inferred from the claim text.