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BT.656 interface with DM6435

Rizwan Hirani
Intellectual 450 points
Other Parts Discussed in Thread: TVP5146

This is regarding one of our new requirement of interfacing 8 bit BT.656 video with TI DSP – DM6435. Now DM6435 supports BT.656 capture for both 8-bit and 10bit mode, thus I am bit confused here regarding connection of 8-bit BT.656 from video source to DM6435 VPIF.

 

I am not sure which one is correct from following two statement. Can soembody please help me here ?

 

1.       D0 [LSB] of Bt.656 source should be connected to D0 [pin name of YI0[ Pin name YI0(CCD0)/GP[36] in DM6435 ] & D8 [MSB] of Bt.656 video source should be connected to D7[ pin name of YI7(CCD7)/GP[43] in DM6435 ]

2.       D0 [LSB] of Bt.656 source should be connected to D2 [pin name  YI2(CCD2)/GP[38] in DM6435 ] & D8 [MSB] of Bt.656 video source should be connected to D9 [pin name of CI1(CCD9)/EM_A[19]/GP[45] in DM6435 ]

 

  • 0
    TI__Intellectual 995 points

    You need to use D0-D7. Per the description in the VPFE UG below:

     

    Data lines CCD[7:0] are used for 8-bit YCbCr data and data lines CCD[9:0] are used for 10-bit YCbCr
    data. The video timing signals, HD, VD, and FIELD are generated internally by the CCD controller module
    of the VPFE.

  • 0 in reply to Xiangdong Fu
    Prodigy 30 points

    I have similar hardware configuration where DM6435 is directly connected to a source of BT.656 8-bit YCbCr data. Please note that I don't have any video decoder(like TVP5146) in the system. There is a host processor that provides 8-bit UYVY interleaved BT.656 video data. Will there be any modifications required in VPFE driver of PSP package? If yes, what kind of changes will be required?

    I have removed the configuration of TVP5146 or any other external decoder from driver. But it is not working for me. I am getting a video buffer that has all zeros.

    Please suggest the changes required in Video driver and steps to be done in application to start video capture.

    Regards,