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how can i output yuv422 datas from dm355 vpbe?

        I have used rgb565 output picture datas in dm355 platform,but now i want to use yuv422 because the rgb16 will lose some datas,When i set the VDMD bits of the VMOD register  form 2h to 0h which means YCbCr parallel 16 bit output , but I cann't get the yuv422 datas,I tested it by colorbar which vpbe supported.and i can find the horizontal sync and vertical sync signal,which is the same value  when i tested in rgb565.

       Anyone can help me resolved the problem?thanks a lot!!