| 摘要 |
PURPOSE:To halve the number of cables and connectors and to make the device small in size, by giving bidirectionality to bus and line and providing a cable driver and receiver circuit which can start only one at the same time. CONSTITUTION:In the write instruction at 2-byte data transfer, bus and line BL0, BL1 are used and they are also used in case of the read instruction, allowing them to use on a 2-transfer line. The name of signals of interface between an input and output controller 10 and an input and output device 20 depends on the type and system. But as is the case with the interface between a channel 7 and the device 10, the control information signifying commands, addresses and status uses transfer paths TO' and TI' having unidirectionality and 2-byte data transferred in parallel use transfer parths BL0' and BL1' having bidirectinality, respectively. Further, a calbe driver and receiver circuit which is started unidirectionally at the same time is provided. |
