| 摘要 |
PURPOSE:To realize the DMA transfer of a two-dimensional data, and to improve the efficiency of an image processing, by generating a real address in a two-dimensional space designated by one time of start-up. CONSTITUTION:By obtaining the position of an area to be accessed in the two-dimensional space, and the number of bytes to be transferred, from a first register 10 in which a horizontal width WDR of two-dimensional space supplied from a CPU is accumulated, and second registers 11 and 12 in which the horizontal width XLR and the vertical width YLR of the area to be accessed in the two-dimensional space are accumulated, a two-dimensional address generation circuit 3 generates an address in order from the forefront real address of an address register 13. Therefore, it is possible to generate the real address of the area in an arbitrary two-dimensional space designated by one time of start-up. |
