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TLK3131: Reducing amount of pairs and adaptive equalizer specifications

Alexis Magana Lemus
Intellectual 1395 points
Part Number: TLK3131

Hi,

Looking to implement gigabit ethernet with TLK3131 to connect the RGMII interfaces together between devices point to point without the use of additional PHY devices  in order to reduce amount of pairs being sent. 

Does this seem reasonable and what is the distances able to be accomplished with the built in equalizer of the device or perhaps better termed the channel loss?

Thanks,

Alexis

  • 0
    TI__Guru* 93670 points

    Hi Alexis,

    Minimum input differential voltage is 100mV while there are multiple settings for the transmitter differential output. For example, if you put SWING setting to 630mV, it means your media could have up to 16dB loss at nyquist and still meet input swing requirement. So knowing your board insertion loss, you can back calculate and determine if this meets receiver requirement. It would be a good idea to allow some margin on top of minimum differential input. For example, we should target 150mV to 200mV even though our sensitivity is at 100mV.

    Regards,, Nasser