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TVP5158 and TMS320DM6467 connection

Guillaume GARDET
Prodigy 80 points
Other Parts Discussed in Thread: TVP5158, TMS320DM6467

Hi,

We are working on a new board with a TMS320DM6467 and a TVP5158.

In the TMS320DM6467datasheet, it is written that the VPIF accept ITU BT.656 (clock at 27 MHz), ITU BT.1120 (clock at 74.25 MHz), SMPTE 296M (clock at 74.25 MHz) and raw data (clock at 99 MHz max) in input.

Firstly, what is the difference between ITU BT.1120 and SMPTE 296M modes ?

Secondly, in the TVP5158 datasheet (page 82), there are application examples which show two connections for D1 applications. The first one show a connection to DM6467 on 8bit@108 MHz and a second one wich is 16bit@54MHz. According to the TVP5158 datasheet (page 25), the 8bit@108MHz is a BT.656 mode and the 16bit@54MHz is a BT.601 mode, but the clock does not match for BT.656 and DM6467 is known to not support BT.601.

Someone could explain it to me ?

 

Best,

Guillaume

  • 0
    Intellectual 340 points

    bonjour guillaume,

    je voudrais te demander un peu d'infos par rapport au DSP6467.

    tu peux m'envoyer ton e-mail s'il te plaît à l'adresse: mail.thiernobah@gmail.com

    merci par avance

    thierno

  • 0
    TI__Mastermind 30190 points

    Guillaume GARDET said:

    We are working on a new board with a TMS320DM6467 and a TVP5158.

    In the TMS320DM6467datasheet, it is written that the VPIF accept ITU BT.656 (clock at 27 MHz), ITU BT.1120 (clock at 74.25 MHz), SMPTE 296M (clock at 74.25 MHz) and raw data (clock at 99 MHz max) in input.

    Firstly, what is the difference between ITU BT.1120 and SMPTE 296M modes ?

    For the exact differences between BT.1120 and SMPTE 296M you will need to refer to the actual standards. Still the document that I reference below should give you some general information.


    Guillaume GARDET said:

    Secondly, in the TVP5158 datasheet (page 82), there are application examples which show two connections for D1 applications. The first one show a connection to DM6467 on 8bit@108 MHz and a second one wich is 16bit@54MHz. According to the TVP5158 datasheet (page 25), the 8bit@108MHz is a BT.656 mode and the 16bit@54MHz is a BT.601 mode, but the clock does not match for BT.656 and DM6467 is known to not support BT.601.

    Someone could explain it to me ?


    - There are some existing TVP5158 to DM6467 interface that have been designed. To start with you can look at the TVP5148 EVM that can be connected to a DM6467 EVM. The TVP5158 User's guide give some information on how the interface has been done. Additionnally the TVP5158 EVM comes with some SW that can be used on the DM6467 EVM:
    http://focus.ti.com/docs/toolsw/folders/print/tvp5158evm.html

    Note that the TVP5158 EVM was tested with a DM6467 EVM. As far as I know it has not been tested with the new DM6467T EVM (the new DM6467T does support a faster pixel CLK on the video interface compared to the original 99Mhz).

    - Some more details on the interface are available in some training material that were presented in the 2009 Tech days. The session5-MultichannelVideo.pdf presentation available from the below link provides the basic concept of transfering several video channel using a single BT.1120 interface (typically using TVP5158 and DM6467).
    See the session5-MultichannelVideo.pdf  from the "San Jose, CA - April 1 & 2" session
    http://www.ti.com/corp/docs/landing/techday09/index.shtml?tab=Europe&DCMP=TechDay_2009&HQS=NotApplicable+OT+techdays09-e#