| 摘要 |
Traditional raster displays have a separate graphics processor and image memory. The image memory is connected to the graphics processor by, e.g., an 8, 16 or 32 bit data bus. The principal disadvantage of such arrangements is that only a limited number of pixels, depending on the bus width, can be modified. The object of the invention is to extend the possibilities of access to the contents of the image memory. This is achieved by integrating the processor, or its data-manipulating unit, and the image memory on one chip. It is thus possible to address and modify lines or columns or parts of them, or blocks of memory cells or pixels. The increased performance is achieved by: - a special structure, - the structure of the image memory, which is quite different from a conventional memory, - the special addressing logic and - the greatly increased data bus width, which is only possible on one chip. The main application field is in raster graphics, e.g. microcomputers, terminals or other raster scan converters.
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