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Can DM8168 display three different video simultaneously?

SuitJune Young
Genius 3985 points

  Can DM8168 display three different video simultaneously?I read the DM1868 TRM,P357 2.1.5.5"2 video clocks to support two independent HD displays, the clock of third HD display will be tied to one of the other two."What's the meaning?The third display is the same as the second HD display?

  Thank you. 

  • 0
    TI__Mastermind 20245 points

    Hi,

    This effectively means that your third video can have same content as any of the other 2 videos. So effectively you can drive 2 separate contents on HD videos and third content will be same as any of the previous 2.

    Regards,

    Hardik Shah

  • 0 in reply to HardikShah
    Genius 3985 points

    I didn't learn it completely.

    In other words,Can I display three 1080P30 different videos through HDMI,HDCOMP and DVO2 simultaneously?

    thank you. 

  • 0 in reply to SuitJune Young
    TI__Guru 66230 points

    In the DM816X platform, HDMI,HDCOMP and DVO2 can only take two different video input, so one of them must share the input video.

    So the answer is no.

    Regards,

    yihe

  • 0 in reply to yihe
    Genius 3985 points

    OK,thank you.

  • 0 in reply to yihe
    Genius 3985 points

    Still not so clearly.You replied:"HDMI HDCOMP and DVO2 can ONLY take 2 different video input"

    You mean the Primary Video Path and Auxilary Video Path?And if it is the case,Can I convert the third 1080P30 video into RGB and "feed" it to graphics planes?Then send it to compositor and display it.Thus,maybe i can display three different 1080P30 video througn HDMI,HDCOMP,and DVO2 simultaneously.

     Is it operational?

    Thank you. 

  • 0 in reply to SuitJune Young
    TI__Guru**** 477995 points

    Yes, you could display different contents using video and grpx pipelines on three vencs, but two out of these three vencs must run same mode as there are only two input pclks.

    Thanks,

    Brijesh Jadav

  • 0 in reply to Brijesh Jadav
    Genius 3985 points

    sorry for my mother language is not english,I don't understand it completely.

    "Same mode"?but CAN display THREE different contents?

    Could you explain "same mode" more clearly? I guess that "same mode"mean the two of these should have the same resolution,same frame rate,but can have different contents.

    Right?

    Thank you. 

  • 0 in reply to SuitJune Young
    TI__Guru**** 477995 points

    Yes, same mode means same resolution with the same frame rate but can have different contents for example 1080p60 display on two VENCs.

    Thanks,

    Brijesh Jadav

  • 0 in reply to Brijesh Jadav
    Genius 3985 points
    Thank you very much!
  • 0 in reply to SuitJune Young
    Prodigy 45 points

    >>In the DM816X platform, HDMI,HDCOMP and DVO2 can only take two different video input, so one of them must share the input video.

    On DVR_RDK, clocks of HDCOMP and DVO2 are tied together. HDCOMP is used for VGA port and DVO2 for second HDMI (HDMI1).

    Does this mean whatever resolution is set for HDCOMP, same will have to be set for DVO2?

    If so, the problem is setting HDMI resolutions e.g. 1080p60, will not be supported by VGA monitors. How does TI intend us to use HDCOMP and DVO2 in this case?

  • 0 in reply to Kamlesh Patel
    TI__Mastermind 19985 points

    Hi,

    Kamlesh Patel said:

    On DVR_RDK, clocks of HDCOMP and DVO2 are tied together. HDCOMP is used for VGA port and DVO2 for second HDMI (HDMI1).

    Does this mean whatever resolution is set for HDCOMP, same will have to be set for DVO2?

    Yes. That’s right. Tying of two displays means that they are driven from same video encoder. So both the tied displays will show the same resolution and timing.

    Kamlesh Patel said:

    If so, the problem is setting HDMI resolutions e.g. 1080p60, will not be supported by VGA monitors. How does TI intend us to use HDCOMP and DVO2 in this case?

     If VGA monitor cannot support 1080P60, then the max resolution in this tied configuration would have to be the max resolution of VGA monitor. Otherwise, DVO2 will display 1080P60 but there would be nothing seen on the VGA monitor.

    BTW, still the on-chip HDMI will show a different timing and resolution.

    This design constraint is due to the available vencs in DM8168.

    Regards,

    Anshuman