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SN65DP159: questions about I2C over AUX

Cindy Chang
Intellectual 2475 points
Part Number: SN65DP159


Hi team,

Could you please help to answer some questions about DP159?

1. How DP159 chooses termination impedance when TX_TERM_CTL floating?

 

2. Is there any difference between DP and eDP when using I2C over AUX?

3. When using I2C over AUX, what is the priority between DDC's H/W and AUX when both of them connected to GPU at the same time?

Best Regards,

Cindy

  • 0
    TI__Guru**** 179526 points

    Cindy

    1. The TX_TERM_SEL selection is based on the data rate.

    Data rate (DR) > 3.4 Gbps – 75- to 150-Ω differential near end termination

    2 Gbps < DR < 3.4 Gbps – 150- to 300-Ω differential near end termination

    DR < 2 Gbps – no termination

    2. The I2C over AUX is supported by the DP++ source, not DP or eDP. If you need to convert from DP or eDP to HDMI, then you would need an active protocol converter, not a passive level shifter like the DP159.

    3. It depends on the GPU. By default GPU must support DDC while some GPU has the option of supporting I2C over AUX.

    Thanks

    David