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DS110DF410: Link tranining support with DS110DF410S

toapex
Prodigy 230 points
Part Number: DS110DF410

hi, TI's experts:

     I don't understant why TI's retimers neither implement the link traning digital logic nor do they pass through the link training amplitude info.

what is link traning digital logic? then what's link training amplitude info?

would you help give an example or some learning data?

I use the Aurota-8B/10B serdes, can I use DS110DF410? so where is the retimer placed, TX or RX?

does the 10Gbase-KR use link traning?

  • 0
    TI__Mastermind 20192 points

    Hi,

    TI's retimers do not have any protocol awareness.  After applying equalization to the signal, it will sample the signal to determine if the signal is 0/1, then re-transmit the signal.  IEEE link training requires either a linear signal chain (such as a redriver) or a protocol aware device in order to correctly function.  If a TI retimer is used in a link training application, the host will try sending a link training sequence to the retimer.  This involves sending data with different TX pre/post settings.  The host then expects to receive data back from its link partner about which TX settings yielded the best performance.  The retimer does not have the ability to send this data back to the host as it has no awareness of the protocol, and it also does not preserve the pre/post settings since it applies its own pre/post settings when it retransmits the data.  This is why TI retimers are not suitable for applications requiring link training.

    TI redrivers are suitable for link training applications as they preserve the pre/post settings.  This allows the host to work with its link partner to determine optimal TX settings.

    With this said, if you disable link training in a 10Gbase-KR application, the DS110DF410 will work fine and provide signal conditioning to your application.  The DS110DF410 automatically adapts its equalization to the signal it receives.  Additionally, most SERDES also have automatically adapting equalization.  Since 10G-KR is used in a backplane application, there is typically a relatively constant insertion loss.  The host TX can be configured with static pre/post settings that yield optimal BER. We have often seen that link training is not a strict requirement in terms of system implementation and can be disabled.  Please let us know if there are additional questions we can help clarify.

    Thanks,

    Drew