| 摘要 |
PURPOSE:To average the bus acquisition between respective modules by giving an identification number for expressing priority necessary for using a common bus to each module and modifying said number at every mediating action. CONSTITUTION:A terminal 10 is used for inputting and outputting the identification number set at each module, and each module is connected to the common bus through the terminal 10. In case of the mediating action, a subtracting part 12 subtracts the signal of a latch part 11 from that of a setting part 1, and the identification number outputted from the subtracting part 12 is outputted to the common bus through a mediating part 2. At this time, the mediating part 2 compares and decides the priority, and only for the module which can acquire the usufructuary right of the common bus because of having the highest priority a bus acquisition signal 4 becomes significant. Then the identification number is outputted from the setting part 1 to the terminal 10 as it is. Thus the identification number is modified through the subtracting part 12 at every mediating action, whereby the priority of the bus acquisition between modules can be averaged. |
