| 摘要 |
PURPOSE:To improve the throughput of a data transfer system using a processor by controlling the occupying time of a bus for each input/output device and omitting the bus arbitrating time. CONSTITUTION:A time designating circuit 4c designates a bus occupying time for each I/O controller 4 and a time monitor circuit 4d monitors the actual data transfer time. When the time counted by a monitor circuit 4d is equal to the value indicated by a designating circuit 4c after the transfer of data is started, a bus 2 is opened for the next request. As a result, an input/output device 5 with which the transfer of data is requested at a comparatively high speed can transfer data without opening the bus 2. Thus the bus arbitrating time is omitted. As a result, the overall throughput is improved for a data transfer system.
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