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SN65LVCP114: How to set the 10GBASE-KR with Ability to transparency

YH Kim
Prodigy 40 points
Part Number: SN65LVCP114

HI 

We can see below comment in SN65LVCP114 DS

"Supports 10GBASE-KR Applications With Ability to Transparency for Link Training"

Customer is using SN65LVCP114 for KR mux so need to set the 10GBASE-KR with Ability to transparency

Questions

1. How to set 10GBASE-KR Applications With Ability to Transparency for Link Training

2. Does Transparency mean No gain?  we need just by-pass mode for KR mux.

3 If not, How to set by pass mode for KR mux

Thanks/YH.Kim

  • 0
    TI__Mastermind 43795 points

    Hi YH,

    1. The SN65LVCP114 is a linear device. The linear response allows the analog signal information to go through the LVCP114 which allows the 10G-KR receiver to process the waveform and train the link as though the LVCP114 was not present in the transmission channel.

    2. Transparency means the SN65LVCP114 is protocol-agnostic and linear.  It provides gain to high frequency components of the input signal to compensate for some of the transmission losses within the 10G-KR channel.  Ideally a linear device like this is completely invisible to the system components.  The only impact is that the receivers "see" a shorter, less lossy channel to do link training on.

    3. See above.  The datasheet have several recommendations for configuring the SN65LVCP114.  In general I would recommend to set the CTLE or EQ to be lower than the expected optimal value.  This gives the 10G-KR receiver more options to train and optimize the link.

    Regards,

    Lee

  • 0 in reply to Lee Sledjeski
    Prodigy 40 points

    Hi Lee

    Thanks for quick response and detailed explanation.

    I'm asking this because

    If end devices are connected to each other directly which means there is no SN65LVCP114 between them, it works well(KR link up)

    But there is SN65LVCP114 between them, it doesn't work(No KR link up)

    So I think if  SN65LVCP114 can set No EQ gain(0 dB), it can work well

    SN65LVCP114 can support No EQ gain(0 dB) and No CTLE?

    If not, could you recommend other device supporting No EQ gain(0 dB)

    Thanks/YH.Kim

  • 0 in reply to YH Kim
    TI__Mastermind 43795 points

    Hi YH,

    Thanks for the additional information about the situation. It can support low equalization and gain.

    How is the SN65LVCP114 configured?

    What is the approximate channel losses between the end devices and the SN65LVCP114?

    Thanks and Regards,

    Lee

  • 0 in reply to Lee Sledjeski
    Prodigy 40 points

    i Lee

    Please see the attached file 

    It seems to be problem on Mux to Quamran signal.

    We don't know the reason yet.

    For configuration, Please see the attached schematic,

    Thanks/YH.Kim

  • 0 in reply to YH Kim
    Prodigy 40 points

    Hi Lee

    Could you update/any comment on this please?

    Thanks/YH.Kim

  • 0 in reply to YH Kim
    TI__Mastermind 43795 points

    Hi YH,

    Sorry for the delay.  I do not see the attached schematic.  Please resend it.

    Please highlight the oscilloscope waveform measurement locations.

    Thanks and Regards,

    Lee