| 摘要 |
PURPOSE:To increase the efficiency of utilization of a trunk circuit by sending out a signal, showing data existence, and a data signal when there are data to be sent or a signal showing data nonexistence where there is no data to be sent to the trunk circuit. CONSTITUTION:Multiplexing part 16 scans cyclically start signal generation part 25, flag part 26, buffer parts 6..., flag part 29 and buffer part 15 to send out a multiplexed signal to trunk circuit 3. In this case, a start signal for multiplexing is send out first and after flag part 26 is checked, signal 1 showing data existence and data (a) are sent out. Next, flag part 27 is checked and data existence signal 1 and data (b) are sent out. Then, flag part 28 is checked and data non-existence signal 0 is sent out. Further, flag part 29 is checked and data existence signal 1 and data A are sent out. Furthermore, the start signal is transmitted again and the abovementioned operation is repeated hereafter. Consequently, an address signal can be removed from the multiplexed signal sent via circuit 3, so that circuit 3 can efficiently be used. |
