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40G-KR interface

Vladimir Yukht
Prodigy 20 points
Other Parts Discussed in Thread: DS100RT410, SN65LVCP1414

Does DS100RT410 or some other device from the family could be used for 40G-KR interface? If "yes" please give a details/reference. If "no" what other solution you can recommend?

Thanks in advance

  • 0
    TI__Guru 62920 points

    Hi Vladimir,

    The support team for the DS100RT410 may be able to give a more exact answer, but from what I can tell it looks like that device is more suitable for front port connections (i.e., to SFP+ modules) or for extending SFI/XFI signals across a backplane.  Since the KR protocol includes provisions to allow a receiver to optimize its link partner's transmit de-emphasis levels through link training, it might make sense to use a linear equalizer like SN65LVCP1414 instead.  That device would compensate for the insertion loss across a backplane while still maintaining the transmission channel's linearity.  This is important to the link training process since it means that each incremental change in the transmitted waveform will be reflected at the receiver input, allowing the receiver to choose an operating point that gives the best margin.

    Please feel free to contact me directly via email if you want to talk in more depth about your application or if you have interest in KR4 solutions beyond equalizer devices.

    Best regards,
    Max Robertson
    Systems Engineer
    Texas Instruments
    m-robertson@ti.com