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DS560DF810: Schematic confirm

Lu Jialin
Prodigy 50 points
Part Number: DS560DF810
Other Parts Discussed in Thread: DS280DF810, DS250DF410

Hi TI team

Could you please help to check Rx pins floating is feasible?

thanks

Jialin

  • 0
    TI__Mastermind 26752 points

    Hi Jialin,

    Thanks for checking on this application.  What you have proposed actually will not work.  The DS560DF810 requires CDR lock in order for the PRBS generator to function.

    Thanks,

    Drew

  • 0 in reply to Drew Miller1
    Prodigy 50 points

    Hi TI team

    1. We want test our RX  capability by PRBS generator, do you know any product you have can only output TX(PRBS) into our device 
    2. Dose the CDR lock require of the PRBS pattern must be output by TX? 
  • 0 in reply to Lu Jialin
    TI__Mastermind 26752 points

    Hi,

    1) What is your target data rate?

    2) I apologize, but I'm not sure that I understand your question.  Can you please clarify?

    There must be a valid signal on the retimer RX to get CDR lock.  This then allows the retimer to output PRBS data from the TX.  The clock used for the PRBS generator is based on the recovered clock from the signal at the retimer RX.

    Thanks,

    Drew

  • 0 in reply to Drew Miller1
    Prodigy 50 points

    HI TI team

    thanks for replied

    1) 25.6Gbps

    2)understood, that need to valid signal on the retimer RX to get CDR lock.  and recovered clock's signal must be come from TX

    or can we input clock signal come from outside? is that work/.

  • +1 in reply to Lu Jialin
    TI__Mastermind 26752 points

    Hi Jialin,

    Since data rate is 25.6 Gbps, could you use DS250DF410/DS280DF810 instead?

    These devices also require CDR lock, but can be supplied with a sub-rate clock input.  For example, for 25.78125 Gbps signal, 25.78125 / 16 = 1.611328125 GHz clock can be supplied to RX and the retimer will get CDR lock to this clock.

    This sort of approach with supplying a sub-rate clock input to get CDR lock is not supported on DS560DF810.

    Thanks,

    Drew

  • 0 in reply to Drew Miller1
    Prodigy 50 points

    Hi TI team

    Thanks for kinds reply and sorry for one more questions

    where's the16 coming from? if i want test from different data rate that all i just data rate/16 is the request CDR clock input ?

    also, it's hard to provide 1.6GHz's clock, is that possible have device can provide 25.6Gbps without CDR?

  • 0 in reply to Lu Jialin
    TI__Mastermind 26752 points

    Hi Jialin,

    Lu Jialin said:
    where's the16 coming from? if i want test from different data rate that all i just data rate/16 is the request CDR clock input ?

    The divide-by-16 is just a sub-rate that I know will allow the retimer to get CDR lock.  You can also use divide-by-2, divide-by-4, and divide-by-8.

    Yes, to test a different rate, just use date_rate / 16.  For 25.6 Gbps, use 1.6 GHz clock.

    Lu Jialin said:
    also, it's hard to provide 1.6GHz's clock, is that possible have device can provide 25.6Gbps without CDR?

    The thought behind 1.6 GHz clock is that this clock frequency is easier to source than a 25.6 Gbps data rate.

    Our retimer devices require CDR lock in order to use the PRBS generator.

    Thanks,

    Drew

  • 0 in reply to Drew Miller1
    Prodigy 50 points

    Hi Drew

    Customer wants to know what is the signal/clock quality requirement into RX(on retimer)?

    Do you have more detailed information on input signals?

  • 0 in reply to Lu Jialin
    TI__Mastermind 26752 points

    Hi Jialin,

    Typically we use a 800mVpp differential clock signal.  A 400mVpp single ended signal will also work.

    Since this is not a typical use case, we don't have too much detailed information on this.  Please let me know if you have additional questions.

    Thanks,

    Drew