Electrical computers and digital processing systems: memory – Storage accessing and control – Control technique
Reexamination Certificate
2000-06-14
2002-12-24
Kim, Matthew (Department: 2186)
Electrical computers and digital processing systems: memory
Storage accessing and control
Control technique
C711S156000, C711S164000, C710S260000, C710S262000, C710S264000, C713S152000
Reexamination Certificate
active
06499092
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates in general to a data processing system, and more particularly to a method and apparatus for performing access censorship in a data processing system.
BACKGROUND OF THE INVENTION
In the data processing system art, it is often desirable to be able to protect an entire system or selected portions of a system from accesses which are defined as unauthorized. As an example, an unauthorized access may be either a read access, a write access, or both types of accesses to a memory storage device storing program or data information used by the data processing system. In some data processing systems an unauthorized access may be defined as an access to a particular resource, such as a port on a micro controller integrated circuit, that is used to access one or more external integrated circuit terminals. In yet other data processing systems, an unauthorized access may be defined as an access to a particular resource of the data processing system, such as debug circuitry or timing circuitry. Regardless of the resource to be protected, an improved approach to protecting against unauthorized accesses was desired.
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Eifert James B.
Harwood, III Wallace B.
Toms Thomas R.
Hill Susan C.
Kim Matthew
Motorola Inc.
Vital Pierre M.
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