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DS125DF1610: CDR cannot be locked

Cherry Zhou
Mastermind 22235 points

Part Number: DS125DF1610

Hi Team,

CDR cannot be locked, what might be the cause? Thanks.

Best Regards,

Cherry

  • 0
    TI__Mastermind 25398 points

    Hi Cherry,

    Here are some possibilities:

    • Signal data-rate incompatible with retimer
    • Invalid signal sub-rate is being used
    • Valid signal sub-rate is being used (div2/4/8), but device DS125DF1610 register config is not set to the proper sub-rate
    • Signal does not have a high enough density of bit transitions for CDR to lock ( channel register 0x0C[3] )
    • Signal does not meet PPM check criteria ( channel register 0x2F[2] )
    • Insertion loss at receiver end exceeds the maximum EQ of the retimer

    To narrow on the possible cause, please share more information about the application (data rate, insertion loss, register dump, ...)

    Thank you,

    Evan