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TMDS181RGZEVM: How to used the TMDS181as a sink part

Feng Han
Prodigy 30 points
Part Number: TMDS181RGZEVM
Other Parts Discussed in Thread: TMDS181, TDP1204

Holle:

      We use the TMDS181 as a sink part at 4K/60,but only support 4K/30.

      The TMDS181'S register set as below:

       tmds181 AS SINK PART.docx 

 

       Plaese   help me . Thank you very much!

  • 0
    TI__Mastermind 42760 points

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  • 0
    TI__Mastermind 42760 points

    For the TMDS181 as a sink, please make sure I2C_EN has 65k pullup and 10k pulldown. Please leave EQ_SEL and TX_TERM_CTRL floating. The SPDIF_IN needs to have a 500k pulldown. The SDA_SRC and SCL_SRC need to have 47k pullup to 5V, they need to check on the pullup resistor value on the SDA_SNK and SCL_SNK.

    Are they manually configuring TMDS181 through its register? For 4k@60 which is HDMI2.0, register 0x0B bit 1 TMDS_CLOCK_RATIO_STATUS need to be 1 for HDMI2.0. But it should set automatically by the TMDS181 based on the DDC snooping.

    On the source side, are they using TMDS181 or TDP1204? If using TDP1204, is the AC_EN pin pulled low or high?