| 摘要 |
PURPOSE:To eliminate the bias of assigment of priority by giving a serial number to plural processing requests and providing a circulating circuit including the serial number to assign uniformly the priority to requests. CONSTITUTION:In deciding the priority of plural processing requests 5, a number represented by a counter 3 and a signal from a decoder 4 are collated by a collating circuit 7, and when they are coincident, the coincident number is preserved. Assuming a processing request decided the priority as l, then when the internal processing as to the l is finished, an end signal is given to an REQ1 from the inside of the device, and the REQ1 is incremented by +1 or decremented by 1. If other request exists after the end signal is issued, the priority decision circuit is operaed by l+1 and l-1 immediately. Thus, the probability of the processing receiving is averaged among plural requests to a processing request arisen asynchronizingly.
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