IMAGE PROCESSING DEVICE

摘要

As shown in Fig. 1, an image processing device comprises image I/O means (100); external memory (111); DMA control means (112) including DMA setting storage means (113), address generator means (114), DRAM control means (115), DMA request generator means (119) and DMA request arbiter means (120); a processor (116) including encoder/decoder means (117); and a DMA bus (118). In this image processing device, a group of DMA-scheduled data is first divided into bursts of data for transmission, and the DMA request generator means periodically issues a DMA request for the bursts of data. In the absence of such data to be transferred, DMA is carried out for data other than DMA scheduled. As a result, a concentration of DMA is prevented.