DATA TRANSFER CONTROL SYSTEM

PURPOSE:To minimize the waiting time of a processor by processing with priority the instruction having a small data transfer quantity in case the synchronous instructions received from plural processors having conflict. CONSTITUTION:The instruction receiving parts 11-1n work independently of each other and prepare the transfer directions, the transferor address, the transfer destination addresses, the data transfer quantity, etc., in accordance with instructions received from corresponding processors and then give a report to an instruction selecting part 20 at the time of said preparation is through. The part 20 selects with priority among those instructions with which the preparation is through and starts processing of the corresponding instruction to an instruction processing part 30. The part 30 gives a request to a transferor device A (or B) to read out the data on a designated address in accordance with the instruction selected by the part 20 and also gives a request to the device A (or B) to write the read-out data. Thus the instructions can be processed in the order of smaller data transfer quantities in case plural instructions have conflict, therefore, can minimize the waiting time with processors can be minimized.