| 摘要 |
PROBLEM TO BE SOLVED: To provide a shared bus mediation system allowing achievement of shared bus mediation with a small-scale circuit configuration; a contribution to scale down a chip size; and simple compliance with a change in the number of CPUs (Central Processing Unit) or the like sharing a shared bus. SOLUTION: The shared bus mediation system comprises: a system clock generation circuit 6 generating system clocks; a plurality of CPUs 1, 2, 3; registers 21, 22, 23 storing the driving condition of each of the CPUs; the shared bus 8 shared by the CPUs 1, 2, 3; and a counter 7 synchronized with the system clocks and up dating a count value. Each of the CPUs secures a use right to the shared bus 8 when the count value satisfies the driving condition of the each of the CPUs. The respective driving conditions are defined so that no driving conditions of the two or more CPUs may simultaneously satisfy with the same count value. COPYRIGHT: (C)2006,JPO&NCIPI
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