Device for protecting memory areas of an electronic microprocessor
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United States of America Patent
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-
Sep 24, 1996
Issued Date -
N/A
app pub date -
Aug 5, 1994
filing date -
Oct 2, 1987
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A decision circuit receives input addresses of instructions to be executed and data addresses to which the instructions have to be applied. The decision circuit either allows the execution of the instruction or prohibits the execution of the instruction if the instruction leads to a false operation or to a fraudulent attempt to divulge the system contents. A buffer register stores the instruction addresses and subsequently presents them to the decision circuit simultaneously with the data addresses. This device applies particularly to the protection of electronic integrated circuit memory cards.
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