Electrical computers and digital processing systems: memory – Storage accessing and control – Shared memory area
Reexamination Certificate
2007-08-21
2007-08-21
Nguyen, T (Department: 2187)
Electrical computers and digital processing systems: memory
Storage accessing and control
Shared memory area
C711S163000
Reexamination Certificate
active
10635599
ABSTRACT:
A microprocessor circuit for organizing access to data or programs stored in a memory has a microprocessor, a memory for storing an operating system, and a memory for storing individual external programs. A plurality of memory areas with respective address spaces is provided in the memory for storing the external programs. Each address space is assigned an identifier. The identifier assigned to a memory area is loaded into a first auxiliary register prior to the addressing of the memory area and the identifier of the addressed memory area is loaded into a second auxiliary register. A comparison of the contents of the first and second auxiliary registers is performed. Furthermore, each address space of a memory area is assigned at least one bit sequence defining access rights, whereby code instructions and sensitive data can be protected against write accesses from other external programs.
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Brücklmayr Franz-Josef
Friedinger Hans
May Christian
Sedlak Holger
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