| 摘要 |
PURPOSE:To prevent malfunction and to facilitate pinpointing troubled parts by providing a simultaneous accept detection circuit which detects whether accept signals that are transmitted to an information processor is simultaneously transmitted to >=two devices. CONSTITUTION:The simultaneous accept detection circuit 40 is provided, and it receives the accept signals 201-204 and checks whether they are transmitted to >=two devices simultaneously. AND circuits 41-46 receive the accept signals 201-204, take their AND and transmit check signals 141-146. An OR circuit 47 receives the check signals 141-146, takes their OR and simultaneously transmits an accept error signal 147. When the accept signals to allow the use of a bus are simultaneously transmitted to >=two information processors, the fact is detected. Thus malfunction is prevented, and troubled parts can be pinpointed in the entire system.
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