Patent ID: 7698474
Filing Date: 2010-04-13
Classification: G06F

Abstract:
1. A direct memory access (DMA) device applied in an electronic device, the electronic device having a processor, a receiving/transmitting unit, and a data storage unit, the direct memory access device comprising: an access unit connected between the receiving/transmitting unit and the data storage unit, the access unit controlling transferring of data between the receiving/transmitting unit and the data storage unit; and a controller connected to the access unit, the controller controlling the access unit to read data from or write data into the data storage unit; wherein the processor is connected to the direct memory access device, the processor reading data from or writing data into the data storage unit through the access unit; and wherein when the receiving/transmitting unit receives data up to a particular amount during data writing, the receiving/transmitting unit requests the access unit to transfer data from the receiving/transmitting unit to the data storage unit where a write pointer of the controller points, and the access unit further sends a notice signal to the controller so that the controller correspondingly changes the value of the write pointer.