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TMDS181: Basic Questions for EQ

Satoshi Yone
Expert 3600 points
Part Number: TMDS181

Hi, Team,

I need to check the below items quickly. Could you please provide the answer for below questions? Please allow me if there are answers on the datasheet. These questions are for automatic configuration.

1. Please let me know the timing which the signal is equalized. Is it 180us after the input frequency is detected?
2. Does EQ configuration change dynamically during a cable is connected?
3. Could you please let me know how to determine the EQ level?
4. If the signal EQ is not adapted, does TMDS181 bypass the signal?

Best Regards,
Satoshi Yone

  • 0
    TI__Guru**** 177636 points

    Satoshi-san

    Equalizers are used to clean up inter-symbol interference (ISI) jitter or loss from the bandwidth-limited board traces and cables. TMDS181 supports fixed receiver equalizer (Retimer and Redriver Mode) and adaptive receiver equalizer (Retimer Mode) by setting the EQ_SEL/A0 pin or through I 2C reg0Ah[5]. When EQ_SEL/A0 is high, the EQ gain is fixed to 14 dB and when set low ,the EQ gain is set to 7.5 dB. TMDS181 operates in adaptive equalizer mode when the EQ_SEL/A0 pin is left floating. The EQ gain is automatically adjusted based on the data rate to compensate for trace or cable loss.

    Page 1 Register 0x4Eh and 0x4Fh reflect the adaptive EQ value.

    Unfortunately I do not have a answer for question #1. 

    Thanks

    David