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Original question:

DS100DF410: Does signal detect cause device to attempt to lock CDR

DS100DF410: What settings can be modified to make CDR lock more consistently

Zach Kimble
Intellectual 2100 points

Part Number: DS100DF410

Hello,

I have noticed that when the transmitting device loses power and then comes back up, CDR struggles to lock when the Tx signal is degraded (but still within the required specs). Which settings can be modified to make CDR lock more consistently? 

Thank you!

Best regards,

Zach Kimble

  • +1
    TI__Mastermind 25218 points

    Hi Zach,

    I would recommend testing with each of the different adapt modes as the first step:

    The recommended adapt mode is application dependent, so testing with each and recording the CDR lock consistency is a good start.

    Beyond this, there are some CDR lock qualifiers that can be disabled to allow CDR to lock more easily (albeit to non-ideal signals):

    0x0C[3] = 0 (single bit limit, requires a minimum density of bit transitions as a requirement for CDR lock)

    0x2F[2] = 0 (PPM count check, requires a minimum precision in the signal's PPM to acquire CDR lock)

    0x2F[1] = 0 (FLD disable)

    Thank you,

    Evan