Mask programmable security system for a data processor and method therefor
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United States of America Patent
Stats
-
Dec 30, 1997
Grant Date -
N/A
app pub date -
Apr 15, 1996
filing date -
Jul 25, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A data processing system (10) allows an authorized user to unlock a security mode by providing a code stored in a plurality of mask registers (60,62,66) such that the system is selectively allowed to communicate with an external device. When an reset signal is received, a selector (48) selects a first mask register (60) and retrieves a first stored address value and a first stored data value therefrom. The first stored address and data values are respectively compared with a first address value and a first data value by a comparator (44). This process of selecting and comparing continues until a final match signal is asserted. When the final match signal is asserted, a secure signal is negated and the system may communicate with the external user.
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