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DP159RSBEVM: How to use EVM to output HDMI 2.0 signal

Kay Chen53
Expert 2225 points
Part Number: DP159RSBEVM
Other Parts Discussed in Thread: TMDS181

Hi Greeting:

We're under co-work with customer about the DP159 performance , we used DP159RSBEVM  (source: HDMI 2.0 input , sink: HDMI 2.0 output) as retimer for HDMI 2.0 to HDMI 2.0 external monitor application. 

But it since like the output only workable with HDMI 1.4 or HDMI 2.0 @ 30KHz.

Could we make a fine tune to adjust the EVM resistance or component to output HDMI 2.0 @ 60KHz?  (BTW, TMDS181 EVM is workable without fine tune) 

thanks again. 

  • 0
    TI__Guru 60870 points
    Hi Kay,

    The DP159RSBEVM has a DP input and a HDMI output populated, how are you testing with a HDMI 2.0 input?

    Is the source able to see a HDMI 2.0 resolution option? This will depend on the DP++ driver of the source.

    If the source is outputting a 4K2K60 signal and the sink is not able to decode it, then please check that the tx_term_ctl is set properly and that the DDC is routed from the source to the sink so that the clock rate change can be set properly.

    Regards,
    JMMN
  • 0 in reply to JMMN
    Expert 2225 points

    Hi JMMN:

    thanks!

    we used the DP159RSB EVM with Rev.B1 for test, which has 1 DP input, 1 HDMI input & 1 HDMI output.

    But I can't find the tx_term_ctl set-up, could you help us know the difference?

  • 0 in reply to Kay Chen53
    TI__Guru 60870 points

    Hi Kay,

    Which input is being used: DP or HDMI?  Can you confirm if there is a HDMI 2.0 resolution option available with the DP159RSBEVM is used?  This would indicate a DP++ driver issue, assuming you are using the DP input.

    The tx_term_ctl is only accessible in the DP159RGZ package, so the tx_term_ctl setting should not be the issue here.  

    If the source is sending an HDMI 2.0 signal, but the sink cannot receive it we need to check if the DP159RSB is setting the clock rate correctly for HDMI 2.0 operation.  Have you installed the EyeScan tool so that you can read the registers of the DP159 device over USB? This capture is from a TMDS181, but you should see the same TX Termination settings and TMDS Clock Ratio with the DP159RSB in HDMI 2.0 mode.