| 摘要 |
PROBLEM TO BE SOLVED: To prevent reduction of computing performance of a plurality of microprocessors 1a, 1b accessing a multiport memory 4. SOLUTION: An arbitration circuit 2 is provided with: wait timers 7a, 7b each outputting a timer signal when detecting that an access waiting state continues over a prescribed time from a wait signal; an access right decision means 5 outputting a changeover signal such that one microprocessor 1a can access the multiport memory 4 on the basis of the timer signal and outputting the wait signal showing access wait to the other microprocessor 1b when access signals from the plurality of microprocessors 1a, 1b compete with each other; and a changeover means changing over a signal from the corresponding microprocessor 1b on the basis of the changeover signal, and outputting it to a single-port memory 3 to allow the access. COPYRIGHT: (C)2005,JPO&NCIPI
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