| 摘要 |
PURPOSE:To ensure a smooth process of transfer, by controlling the relation of conflict of a common bus with use of a data transfer request signal. CONSTITUTION:A bus driver receiver 10 performs the switching control for the transfer direction of data between the read mode of the data given from a floppy disk device 3 and the write mode of the data given from a main memory 2, and also has a gate function for the transfer of data. A direct memory access controller 14 coacts with a transfer controller 13 to control the relation of conflict to other devices in terms of the occupancy of a common bus 6 by a data transfer request signal, and carries out the direct control of transfer for the data stored in the 1st and 2nd buffer memories 11 and 12 to the memory 2 by an affirmative answer signal. |
