| 摘要 |
PURPOSE:To realize a memory device which is inexpensive and high in mounting efficiency, by not inputting a discriminating information which has been received from a common bus, to a control system in a device, but sending it out to the common bus, in a data processing system using an asynchronous two-way common bus. CONSTITUTION:When a central processing equipment 14 which requests to read out a data from a memory device 13 transfers a read-out address, a read-out instruction signal, and a discrimination number of the central processing equipment 14, to the memory device 13, read-out is started, and when a read-out data is obtained, the read-out data information and the discrimination number are transferred to a common bus 10. An equipment which has coincided with the discrimination number of the own device, that is to say, the central processing equipment 14 only inputs a read-out data on the common bus. |
