DATA TRANSFER SYSTEM

PURPOSE:To provide the data transfer system in a DMA transfer capable of storing data in a memory in good order even when the DMA level of each signal input device is the same in a data order shaping system in the DMA transfer transferring input data from plural signal input devices to the memory in good order. CONSTITUTION:In the system, a signal input device 10 having plural input channels is connected through a databus 3 and data are DMA-transferred to a memory 7 connected from the signal input devices to the databus under the control of a DMA controller 8. The device 10 contains a transfer control circuit 11 performing the DMA control, register circuit 12 storing the number of data to be inputted, the number of signal input devices to trnasfer data at the same level, and the priority order of the pertinent signal input device 10, and counter circuit 13 counting the order. Thus, the occupancy right of the databus is exclusively controlled through the circuit 13.