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DS125BR800: Eye Diagrams & KR

Go Bravos
Expert 6090 points
Part Number: DS125BR800
Other Parts Discussed in Thread: DS110DF111, DS125DF410, DS125BR820

Team,

A few questions on the DS125BR800:

  1. Can it capture eye diagrams?

  2. How do we display the eye diagram - with a standard TI i2c dongle and some GUI application?

  3. Do we have to program the equalization through i2c after every power up cycle, or can it load from eeprom?
  4. Do you have any info on how this redriver chip works during the KR eq-autoneg cycle? Does it interfere with it, or would it cause an autoneg failure?

Thank you.

  • 0
    TI__Mastermind 43795 points

    Hi,

    1. The DS125BR800 will not capture eye diagrams - our 10G/12G retimers like the DS110DF111 or DS125DF410 will capture eye diagrams.

    2. On the retimers listed above the eye can be displayed using the Sigcon Architect GUI via SMBus interface

    3. You can either load with SMBus after every power cycle or load from EEPROM on power-up.

    4. The DS125BR800(A) or DS125BR820 are linear equalizer devices which allow the analog characteristics of the 10G-KR waveform to pass through to the ethernet receiver.  This allows the link training to take place just as if the redriver was not in the channel.  To the ethernet receiver the channel would look to have less attenuation then the channel without a redriver.

    Regards,

    Lee

  • 0 in reply to Lee Sledjeski
    TI__Expert 6090 points

    Lee,

    Thanks. This helps. My problem is increased reflections and crosstalk, not excessive attenuation. I guess I would have to use a retimer, but then link training is an issue.

  • 0 in reply to Go Bravos
    TI__Mastermind 43795 points

    Hi,

    Our retimers could help with the reflections and crosstalk issue, but link training would need to be turned off for both 10G-KR components.

    Regards,

    Lee