| 摘要 |
PURPOSE:To equalize the acquisition of the bus using right modules by decreasing and replacing the ID (identification) number set to each module for every acquisition of the bus using right. CONSTITUTION:In an initialization mode a selector part 10 selects the signal of a setting part 1 and transmits it to a latch part 11 with each module. The part 11 stores the selected signal as an ID number of a module. For acquisition of the bus using right, the priority degrees are compared with each other based on the ID number through a mediation part 2. Then a bus acquisition signal 4 is significant only with a module that has the highest priority degree. Thus said module acquires a bus. Then the value of the ID number is decreased by 1 by a decrement part 12 and then replaced to be latched by the part 11 for the next mediating action. |
