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TUSB546EVM: CONFIG1 and CONFIG2 confunction for DP interface

Hardy Zhou
Intellectual 1650 points
Part Number: TUSB546EVM

I want to know the function for CONFIG1 and CONFIG2 of DP interface.

and I want to know if the two pin wires connecting to DP host could be removed in TUSB546EVM.

Thanks

  • 0
    TI__Mastermind 23815 points

    Hi Hardy,

    These pins are used in DP dual mode when the source is transmitting HDMI video AC coupled, then you need a level shifter to have HDMI DC coupled signals.

    CONFIG1 -> Cable Adaptor Detect (CAD), this is high when a level shifter is connected to send HDMI video.

    CONFIG2 -> Consumer Electronics Control (CEC) this is an HDMI signal, it is used to control your media devices connected through HDMI using just one remote control.

    if they are not used, you still need the 1M pull-down on CONFIG1 and 5M pull-down on CONFIG2.

    Regards

  • 0 in reply to Moises Garcia
    TI__Intellectual 1650 points

    Hi

    thanks for your reply.

    this is only for DP application.

    local has checked the DP Standard V1.4 chapter 3.2.1 about CONFIG1&CONFIG2 descriptions,

    There is a bit different from your feedback, both the two pin should be  pull-down with 1Mohm. 

    and pls help check if the DP host side has the pulldown resistor, should we remove the pull-down resistor from the DP physical interface side? thanks.

      DP host side in PC main board  ----> DP physical interface

  • 0 in reply to Hardy Zhou
    TI__Mastermind 23815 points

    Hi Hardy,

    For DP only, the resistors can be 1M ohms or larger.

    The resistors are commonly placed close to the connector, it shouldn't be a problem if the resistor is close to the host.

    Regards

  • 0 in reply to Moises Garcia
    TI__Intellectual 1650 points

    Hi

    thanks for your reply, another quesiton is that,  if i can remove the two pin connnection between the connector and DP host if it is only for DP application, so that i can use less wilres to connect the connector and DP host which can be cost down for the system design.

    thanks.

  • 0 in reply to Hardy Zhou
    TI__Mastermind 23815 points
    Hi Hardy,

    Yes, you can remove the connection for this signals. Just remember the source should have this two signals asserted low and the connector should have 1M ohms pull-downs on both CONFIG1 and CONFIG2.

    Regards
  • 0 in reply to Moises Garcia
    TI__Intellectual 1650 points
    Thanks for your reply and i will test the DP performance after removing the CONFIG1 and CONFIG2 wires.