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STM32F479 数据表(PDF) 47 Page - STMicroelectronics |
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STM32F479 数据表(HTML) 47 Page - STMicroelectronics |
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47 / 91 page  DocID029237 Rev 2 47/91 AN4861 Creating a graphical application with LTDC 89 Figure 27. Adding dummy bytes to make the line width multiple of 64 bytes 4.5.3 Optimizing the LTDC framebuffer fetching from SDRAM Making random access into a bank generates some precharge cycles which increase the SDRAM latency seen by the LTDC. As the LTDC is performing sequential accesses, it's important that no other masters are doing access into the same SDRAM bank. The external SDRAM is composed of multiple banks. Given that making random accesses on a bank generates some precharge and activates some cycles, the framebuffer must be placed in an independent bank accessed only by the LTDC. This action reduces the external memory latency and leads to a higher throughput. As a consequence, when double framebuffer technique is used, it is recommended to have these buffers in two separate banks. This can be done by storing the frontbuffer in the first address of the SDRAM and addressing the backbuffer by adding an offset with the size of one bank. Refer to Figure 28. |
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