| 摘要 |
PROBLEM TO BE SOLVED: To provide a control system for a CPU access space which excludes the trouble to control the discrimination of access to common memories of both systems by a specially provided register, etc., by enabling software to freely access the dual common memories without paying attention to the discrimination of access by dividing the access space of a CPU specially. SOLUTION: A CPU accesses respective memory parts through a control bus confounding control part, which automatically recognizes the physical space of a memory that the CPU accesses to judge whether writing is performed to both or one of memories 1 and 2. Consequently, the software can perform control without paying special attention to discriminations of access to the common memory of its system, access to the common memory of the other system, and access to the common memories of both systems.
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