| 摘要 |
PROBLEM TO BE SOLVED: To provide a multiprocessor system which can switch programs to become visible by processors even with the same physical address and then simplify the circuit constitution, lower the cost, and improve software development efficiency. SOLUTION: The multiprocessor system is constituted by connecting CPUs 1 and 2, on-chip ROMs 12 and 13 stored with programs, and an external ROM 14 and an external RAM 15 to a common system bus 3 and comprises an arbiter 6 which determines a CPU allowed to occupy the bus according to specific bus priority in response to bus request signals REQ4 and REQ5 from the CPUs 1 and 2 and outputs bus permission signals GNT7 and GNT8, a decoder 10 which outputs a select signal CSa for selecting memories corresponding to the CPUs 1 and 2 according to the bus permission signals GNT7 and GNT8 and the address signal A31-A0 of the system bus, etc.
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