| 摘要 |
The objective of the invention is to conduct access of image data in the diagonal direction at high-speed by using the page mode. The memory region is divided into four memory arrays (15-1 to 15-4), and shifters (13-1 to 13-4) [sic: (14-1 to 14-4)] are provided that can shift the page address by one address in relation to each memory array. The image data are divided into sub-blocks of 4x4, 4 data items for the vertical correction are stored in the same memory array, and the page addresses for the sub-blocks connected in the horizontal direction are stored so as to be consecutive. In the case of accessing the data in the diagonal direction, when the data straddle adjacent blocks 4 at a time from the top, the page address is shifted by a shifter for the memory array containing that straddled column. In this way even in accessing the diagonal direction, 4 units of data are always obtained for a 1-page access, and data scanning of the diagonal direction by the page mode becomes possible.
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