Electrical computers and digital processing systems: memory – Storage accessing and control – Shared memory area
Reexamination Certificate
2011-05-24
2011-05-24
Gu, Shawn X (Department: 2189)
Electrical computers and digital processing systems: memory
Storage accessing and control
Shared memory area
C711S156000, C711S163000, C711S170000
Reexamination Certificate
active
07949835
ABSTRACT:
A data processing apparatus and method are provided for controlling access to memory. The data processing apparatus comprises main processing logic operable to execute a sequence of instructions in order to perform a process, and subsidiary processing logic operable to perform at least part of the process on behalf of the main processing logic. A memory is provided that is accessible by the main processing logic when performing the process, the main processing logic defining a portion of the memory to be allocated memory accessible to the subsidiary processing logic when performing part of the process on behalf of the main processing logic. Further, a memory management unit is provided that is programmable by the main processing logic and operable to control access to the allocated memory by the subsidiary processing logic. The main processing logic is arranged to program the memory management unit such that for an access request issued by the subsidiary processing logic relating to the allocated memory, the memory management unit produces a memory address and one or more associated memory attributes identifying one or more properties of the allocated memory at that memory address.
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Felton Donald
Kershaw Daniel
Stevens Ashley Miles
Thompson Anthony Paul
ARM Limited
Gu Shawn X
Nixon & Vanderhye P.C.
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