DEVICE AND METHOD FOR CONTROLLING DMA

摘要

PURPOSE: A device and a method for controlling a DMA(Direct Memory Access) are provided to realize the fast data transfer between the external memories having variable waiting time and connecting to a processor without a bus arbitration interface for a DMA controller through a bus. CONSTITUTION: A DMA control circuit(230) comprises a plurality of DMA control circuits(231-23n) respectively allocated to a plurality of channels. A bus arbiter(220) performs the bus arbitration between the DMA control circuits(231-23n) and the processor(100). A processor interface circuit(210) converts a memory control circuit of the processor(100) into a control signal for the bus arbitration and outputs it to the bus arbiter(220). An output signal of a bus master corresponding to the DMA control circuit(231) obtaining a bus priority according to the bus occupation status information outputted from the bus arbiter(220) is transferred to the external memory(300) by a bus controller(240).