APPARATUS FOR DIRECT MEMORY ACCESS FOR ABSOLUTE PRIORITY DMA REQUEST AND METHOD THEREOF

摘要

A DMA device and a method for processing an absolute priority DMA request are provided to minimize delay by preferentially processing a DMA request from a peripheral requiring fast processing and processing a suspended DMA operation surely when a situation for transferring data by urgently requesting DMA. An input part(100) provides a path for transferring data to the peripherals, and receives the data required for receiving the DMA request from the peripheral and providing the DMA to the peripherals. A priority determiner(110) determines priority of the peripherals and assigns the highest priority to an absolute priority peripheral. A state determiner(120) suspends the DMA operation for other peripherals, temporarily stores the information for the suspended DMA operation to a temporary storing part(130), and provides a DMA function to the absolute priority peripheral if the DMA request is received from the absolute priority peripheral. If the DMA operation is completed, the state determiner restarts the suspended DMA operation by loading the information from the temporary storing part.