| 摘要 |
PURPOSE:To reduce the excess time to a reserve action and to improve the bus using efficiency by performing the transfer of data in regular order even in case the transfer of data is reserved in a multiplex way. CONSTITUTION:If devices A and B make reservations to a device C, the output of a decoding circuit 6 is equal to the device number data of a device Y in a time section 16y allotted to the device Y and has no coincidence with the numbers stored in a transmitter number register (where the device number data allotted to the device A is stored by the device C). Therefore no coincidence signal is delivered from a receiving circuit 4, and the device C has no operation. In a time section 16a of the device A after a time section 16Z of the device Z, the coincidence between the output of the circuit 6 and the device number data within the register 5 is detected by the circuit 4. Then a coincidence signal is delivered to a signal line 13. In this case, if a data transfer request signal 10a is delivered from the device A, data 12b-12e are transferred to the device C by a transfer agreement signal 14a via an AND circuit 2. |
