| 摘要 |
PURPOSE:To attain the bus using right with a simple constitution by using a single bus use request signal line, the system clock and the system reset signal. CONSTITUTION:Plural bus use requesters 12 share a single bus use request signal line 21. Each requester 12 checks whether the line 21 is busy or not when receiving a bus use request and sets the line 21 under a busy state through a control part 22 as long as the line 21 is not busy. Here the timing allocated to all requesters 12 by the system reset signal and the system clock used to secure the system synchronization is utilized when the part 22 checks the using state of the line 21. |
