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Limitations on using DSP DM8168

Hello

we want to use the DSP on DM8168 with Codec Engine. We made a lot of work for tuning the performances. We investigated caching, memory segment etc but we still find that the DSP side is very slow for transfer data from the outside memory. It seems that the same operation done on DSP (example, lut on image) is slower than the same on A8 side. What are the things that affect the memory for DSP transfers? Why ARM seems to be much more faster in memory transfer? Could we improve in someway the DSP performance? I see that there could be some priorities or similar aspects to tune. For my application, have the same performance on DM8168 than the DM6446 that has a lower DDR clock with the same alghoritm that runs on the DSP side.