| 摘要 |
PROBLEM TO BE SOLVED: To provide a communication system for executing data transfer through a shared memory capable of quickening inter-system or inter-block communication by writing or reading the inter-system data for the shared memory, and quickly detecting information notice or the like from the other system device without imposing any labor on a central processing unit. SOLUTION: In transmitting the data of a local memory 12 of an A system device 10 to a local memory 22 of a B system device 20, a direct memory access controller(DMAC) 13 directly accesses and transfers the data of the local memory 12 to a shared memory 30. The DMAC 13 notices the data transfer completion by interruption to both a central processing unit(CPU) 11 of its own system and a CPU 21 of the other B system device 20 through an interrupting branch circuit 14. The data transfer completion of the shared memory 30 is noticed to the CPU of the other system by interruption so that it is possible to quickly carry out information notice without suppressing the processing capability of the CPU 21, and to quicken inter-system communication. COPYRIGHT: (C)2004,JPO
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