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DS125DF111: How to determine the data rate SFP in datasheet

Deepak Guruswamy
Prodigy 30 points
Part Number: DS125DF111

Hi TI Team,

Our client requirement is SFP/SFP+ interface (1Gbps/10Gbps). As per the design, the system implementation will be  LS1046A--> Retimer(DS125DF111)-->SFP port / SFP+ port. 

In datasheet fig 9 typical application is mentioned as only SFP+ port, not SFP.

Can you check on the above? 

Also please confirm the DS125DF111 register preprogrammed for the data rates( SFP/SFP+) to ensure CDR lock?

- Deepak Anand G

  • 0
    TI__Mastermind 36623 points

    Hi Deepak,

    You can use the retimer for SFP for a data rate of 1Gbps.  You can also use the retimer for SFP+ 10Gbps.

    For rates of 1.25Gbps and 10.3125Gbps, you will need to change the VCO rate and dividers.

    I have provided a sequence below, but please verify that this fulfills your requirements..  Please note that some of the writes from this sequence are from Tables 9 and 12 in the datasheet (also attached below).

    Register Address Register Value Register Mask Description
    0xFF 0x0C 0x0C Broadcast writes to both channels
    0x0A 0x0C 0x0C Assert CDR Reset
    0x60 0x00 0xFF Set data rate
    0x61 0xB2 0xFF Set data rate
    0x62 0x90 0xFF Set data rate
    0x63 0xB3 0xFF Set data rate
    0x64 0xCD 0xFF Set data rate
    0x2F 0xF0 0xF0 Set dividers
    0x0A 0x00 0x0C Release CDR Reset

    Thanks,

    Drew

  • 0
    Prodigy 30 points

    Thanks you.

    Can you check TI SGMII (SFP) and XFI (SPF+)?

    Because NXP CPU (LS1046A) interface pin SERDES  SGMII <-> 1.25Gbps and XFI <-> 10.3125Gbps.

  • 0 in reply to Deepak Guruswamy
    TI__Mastermind 36623 points

    Hi Deepak,

    Typically SGMII is an LVDS signal.  Please note that the DS125DF111 expects a CML signal.  It is possible to convert CML and LVDS signals, but we have not done any validation to ensure compatibility with LVDS signals.

    The DS125DF111 is compatible with XFI.

    Thanks,

    Drew