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DM8148 BT656 output through DVO2

Dear all,

I use the DVRRDK_03.00.00.00 and configure the 480P BT656 output to DVO2 on DM8148. However, the output will connect to a fpga that can accept the BT656 format. When I modify the HD_VENC_D_DVO2 register to 0x4180A031, the fpga can not recognize the video format. Can anyone give me some hints about this portion where I also need to modify? Please refer the register dump as below. Thanks in advance.

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0x4810A000:    4180A031    00000000    00000000    00000000    00000000    00000000    00000000    00000000    
0x4810A020:    00000000    00000000    8420D35A    00000000    3E2D0079    00000000    00000000    3E2D007A
0x4810A040:    00024000    0020D000    06000000    00000000    00000000    3E2D0072    00024000    001E0000    
0x4810A060:    06000000    00000000    00000000    00000000    00000000    00000000    00000000    00000000

B.R.

OC