Patent ID: 6944682
Filing Date: 2005-09-13
Classification: G06F,G09G

Abstract:
1. A direct memory access (DMA) controller system for processing image data, comprising: an external memory having a descriptor area for storing descriptor information; an image memory to store the image data having at least two areas; a first DMA controller connected to said external memory and said image memory for reading first descriptor information and for transferring blocks of the image data via DMA transfer alternately to one of the at least two areas of said image memory for processing according to the first descriptor information, the first descriptor information including a pause bit indicative of a halt state for said first DMA controller to temporarily halt the DMA transfer after said first DMA controller writes the block of the image data in one of the at least two areas; and a second DMA controller connected to said external memory and said image memory for reading second descriptor information and for transferring to a predetermined outside unit the blocks of the processed image data that said first DMA controller had already transferred in at least the two areas of said image memory according to the second descriptor information concurrently with said first DMA controller transferring other blocks of the image data in said image memory, said second DMA controller directly indicating to said first DMA controller in the halt state to resume the DMA transfer via a resume instruction.