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DM6467 VGA output

elst
Prodigy 40 points
Other Parts Discussed in Thread: THS8200

I am inputting SD video to a DM6467 using BT.656 format. I want to know if there is a simple way to display this video on a VGA/SVGA monitor via the video output port of the DM6467 (and additional hardware).

Thanks.

  • 0
    TI__Expert 5000 points

    On DM6467 composite,component and S-Video interfaces are supported for capture and display. VGA is not directly supported on the EVM. However you can use a composite to VGA or S-Video to VGA converter and achieve this.

    Thanks,

    Prathap.

  • 0 in reply to Prathap Srinivas
    Prodigy 40 points

    As I am building an embedded system, what is supported on the EVM is not so much of interest to me. If I understand correctly, EVM aside, if I want to display captured  SD video then first I have to output it from the DM6467 as SD video and then with an external circuit convert it to VGA format. There is no way that this transformation can be performed within the DSP. Is this correct?

    Thanks.

  • 0 in reply to elst
    TI__Mastermind 41665 points

    elst said:
    If I understand correctly, EVM aside, if I want to display captured  SD video then first I have to output it from the DM6467 as SD video and then with an external circuit convert it to VGA format. There is no way that this transformation can be performed within the DSP. Is this correct?

    This would just be how you would do this easiest with the EVM, if you assume that you cannot really change the hardware on the board, however if you were building your own hardware you can perform this conversion more directly, though you still need external circuitry to do a color space conversion and DAC operation. For example you could use a THS8200 video DAC to take the output from the DM6467 and perform a color space conversion to RGB and DAC conversion to get a VESA (analog VGA) output.

  • 0 in reply to Bernie Thompson TI
    Prodigy 40 points

    Thanks. If the captured video is NTSC (interlaced), with the THS8200 is it possible to display the captured video on a VGA monitor which is, by definition, non-interlaced? And, what about the frame rate. As far as I know, most monitors don't work at less than 60 Hz for a full non-interlaced frame.

    Eliot 

  • 0 in reply to elst
    TI__Mastermind 41665 points

    The DM6467 would be doing this part of the conversion, it would have to deinterlace, adjust the frame rate, and potentially scale the video. The deinterlacing can be simple or complex depending on what method you use, the frame rate adjustment happens just by virtue of the capture and display drivers having multiple buffers (you end up with the slower NTSC frames being displayed for more than one of the faster VGA frames), and the scaling can take some resources depending on how it is implemented much like the deinterlacing.

  • 0 in reply to Bernie Thompson TI
    Prodigy 40 points

    Bernie,

    Thanks, you've been very helpful.

    Eliot

  • 0 in reply to Bernie Thompson TI
    Mastermind 6805 points

    Could authors & watchers of this thread please look at my question over at http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/99/p/71899/261068.aspx#261068 ?

    Thanks.