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Original question:

AM69: Concurrent DP/DSI display usage

AM69: Clarifying Display capabilities

Brian Wang
Expert 8505 points
Part Number: AM69

Tool/software:

The table below lists different interfaces under DSI, DSI-DPI and DSI-SDI. We are having trouble figuring out exactly what those terms mean because the datasheet references 2x DSI and 1x DPI, but this section in the TRM references 2x DPI and 1x DSI. The reason for the concern is that in that pixel format interoperability table, the only way to get 1 pixel format that works across eDP and some type of DSI is if we are using DSI-DPI.

 

 

 Our schematic is wired as shown below. This makes me think we are using 2x DSI-SDI (for serial maybe?). In that case there is not a compatible pixel format across DSI and eDP. With this hardware setup, can we expect to get 3 simultaneous outputs on DSI0, DSI1, and eDP?

 

 

  • 0
    TI__Guru 52465 points

    I can confirm the device supports 1x DPI (parallel video output), 2x DSI (MIPI D-PHY Serial Video outputs), and 1x eDP/DP (DisplayPort output).  I'm looping another resource regarding the pixel format question.

  • 0 in reply to Robert Eschler
    TI__Expert 8505 points

    Thanks Robert,

    To clarify, the target format for the customer in this instance is 2x DSI and 1x eDP/DP output simultaneous. Am I then correct in saying that RGB101010 and RGB121212 are compatible pixel formats for both outputs and that this high level architecture will work for this application?

    Brian Wang

  • 0 in reply to Brian Wang
    TI__Guru**** 478035 points

    Hi Brian,

    Do you mean at the output of DSI and eDP interfaces? Then we support only RGB888 output format for these output interfaces. 

    Regards,

    Brijesh

  • 0 in reply to Brijesh Jadav
    TI__Expert 8505 points

    Brijesh, 

    Perhaps you can help explain the pixel interoperability table in the initial post? Maybe I am misunderstanding it. It seems to get 3 outputs we would need a compatibile format for 2xDSI and 1x eDP and that seems to be what is indicated in that table.

  • 0 in reply to Brian Wang
    TI__Guru**** 478035 points

    Brian,

    I am sorry, but what is the question here in this table of interoperability? Do you mean formats support? Then here also it is RGB. But this is between DSS and DSI/eDP..

    Regards,

    Brijesh

  • 0 in reply to Brijesh Jadav
    TI__Expert 8505 points

    Brijesh, 

    In the table referenced in the original e2e post (table 12-401), it shows that between dispc vp output and eDP, the compatible pixel formats are RGB101010 and RGB121212. For between dispc vp output and DSI, it seems all are okay. Maybe I do not understand what this table means - is the dispc vp output required to be uniform between all 3 outputs? For a customer what considerations should be taken into account when trying to drive 3+ displays?

  • 0 in reply to Brian Wang
    TI__Guru**** 478035 points

    Hi Brian,

    Yes, the formats from VP to DSI will remain same and this will be taken care by the DSS driver internally. So no, customer does not need to take care of thsi when driving 3 displays. 

    Regards,

    Brijesh