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Analog RGB and comp sync.

Gokhan Yenikaya
Prodigy 40 points

I am trying to make an interface between DM365 and SCART. I need analog RGB and composite sync for that purpose. Could I directly interface the DM365 to the SCART, or do I have an additional part to achieve that.

  • 0
    TI__Mastermind 41665 points

    The DM365 has only three DACs, so it does not seem to be possible to generate the full SCART signal directly (i.e. analog R, G, B, and composite), it is capable of outputting RGB (using sync on green) through the DACs or composite through the DACs, but since there are only three DACs you could only have one mode at a time. This being said, I believe you would need an additional external part to manage such an interface, likely a video encoder to generate the composite video signal along side the RGB of the DM365 (or vice versa).

  • 0 in reply to Bernie Thompson TI
    Prodigy 40 points

    I am a bit confused, sorry, in the document LSP 2.10, Da Vinci Linux Drivers, namely sprs566a.pdf, under the caption 2.4.1, it is written that there are four DACS internally in the 7th bullet. And also in the document VPBE user's guide, namely sprufg9b, in table 159, under the caption 6.3.4 Sync Control Register, the 6th bit enables the composite sync through the pin 36 and 7th pin changes the polarity of the composite sync. I can not achieve the correct solution  in one way or another. I need help.

  • 0 in reply to Gokhan Yenikaya
    TI__Mastermind 41665 points

    Gokhan Yenikaya said:
    I am a bit confused, sorry, in the document LSP 2.10, Da Vinci Linux Drivers, namely sprs566a.pdf, under the caption 2.4.1, it is written that there are four DACS internally in the 7th bullet.

    There are 4 DACs in other devices, like the DM6446, as the rest of the hardware is similar the Linux drivers are also similar, it looks like that text was incorrectly copied from a prior version of the document for a DM6446, it seems like a documentation bug. The DM365 datasheet says 3 DACs on the first page.

    Gokhan Yenikaya said:
    And also in the document VPBE user's guide, namely sprufg9b, in table 159, under the caption 6.3.4 Sync Control Register, the 6th bit enables the composite sync through the pin 36 and 7th pin changes the polarity of the composite sync.

    The pin in question, COUT3, is a digital pin, so it will allow you to have a transition at the time of the composite sync but it will not be what you would expect on a composite video output, at least that is my impression. The modes it talks about being used in are digital outputs not analog as well.