| 摘要 |
PURPOSE:To enable a microprocessor for central processing to access to a shared storage without waiting state and thereby to improve the processing capability by providing the shared storage on the microprocessor for dispersed processing. CONSTITUTION:When an arithmetic processing part 3 accesses the shared storage 4, a bus control circuit 5 detects the access action and outputs a wait- request signal to provide a waiting state because a bus gate 6 is disabled by the initialization. When the circuit 5 detects that the microprocessor for central processing 2 is not accessing the shared storage 4, it inverses a bus gate signal 9, enables the bus gate 6 and disables a bus gate 7, as well as stops the outputting of the request signal 10. Therefore, the part 3 is relieved from the waiting state and accesses the shared storage 4.
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