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Original question:

DS100DF410 support for 1GbE

DS100DF410 support for 1GbE

Mohanraj C
Prodigy 20 points
Part Number: DS100DF410

Hi,

    Lot of discussion about DS100DF410SQE to work with 1GbE mode.

As per datasheet we need set only these two registers need to be set for 1GbE application,

For 1GbE applications, it is required to bypass the CDR by setting the override bit 5 of register 0x09 to 1, and set
the data mux bits [7:5] to 3'b000 of register 0x1E.

Other than these two registers any other registers need to set  for 1GbE ?

  • 0
    TI__Guru* 88895 points
    Greetings,

    Settings you noted above:
    Reg 0x09[5] = 1'b1
    Reg 0x1E[7:5] = 3'b000

    This causes the DS100DF410 CDR to be in bypass mode. In an earlier post, i had suggested to reset DS100DF410 CDR state machine as well. Normally when we change data rate on the device - without losing signal - it is a good idea to reset the CDR state machine. Here is how to reset CDR state machine:
    Write channel reg 0x0A[3:2] = 2'b11
    Write channel reg 0x0A[3:2] = 2'b00

    Regards,,nasser
  • 0 in reply to Nasser Mohammadi
    Prodigy 20 points
    Hi nasser
    Thanks for your reply.
    Settings Reg 0x09[5] = 1'b1
    Reg 0x1E[7:5] = 3'b000 applicable when the device operates as per datasheet 7.3.12 Ref_mode 0 Mode (Reference Clock Not Required).
    Also i have given the option on my hardware to work with as per datasheet 7.3.13 Ref_mode 3 Mode (Reference Clock Required)
    in this condition above register settings are not required?.Only if we reset the CDR is sufficient as per your suggestion ?
  • 0 in reply to Mohanraj C
    TI__Mastermind 43795 points

    Hi

    Overridding the output mux and selecting "raw" data output will work in Ref_Mode = 0 or Ref_Mode = 3.

    As Nasser suggested - we always recommend to Reset - Reset Release the CDR between data rate changes.

    Regards,

    Lee