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Original question:

DP83867ERGZ-S-EVM: Basic SGMII configuration

DP83867ERGZ-S-EVM: PHY to SGMII SFP Media Converter

Chester Kronke
Prodigy 230 points
Part Number: DP83867ERGZ-S-EVM
Other Parts Discussed in Thread: DP83869, DP83869EVM

Need to know if the DP83867 used on the DP83867ERGZ-S-EVM Eval Board is a good choice for implementing a PHY to SGMII SFP Media Converter.  i was thrown by the SMA connections on the eval board for the SGMII Interface signals.  These are the same signals that would go to the SFP socket for the SGMII SFP module, correct?  

Also wondering is Alex had success with using the Eval board with an SFP Module as was described in the related closed (Resolved) topic "DP83867ERGZ-S-EVM: Basic SGMII configuration"

  • 0
    TI__Expert 5670 points
    Hi Chester,

    Can you clarify a little bit more about what you are trying to implement?

    Are you trying to design a SGMII SFP module, i.e. the DP83867 will be on the SFP module?

    Regards,

    Hung Nguyen
  • 0 in reply to Hung Nguyen92
    Prodigy 230 points

    Hung,

    Thanks for your reply.  No, I am not implementing an SFP module.  The goal is to implement a Media Converter similar to AD-Net AN-UM-SMC-AS-J (as an example).  I need to implement this functionality on-board a new PCB design which has an SFP socket and also receives an existing daughter card module for video capture.  The daughter card has a wired Ethernet interface and we need to convert this interface to a suitable SFP supporting SGMII standard (to support Gigabit fiber Ethernet).  The PHY I'm looking for would support converting from the wired PHY interface of the daughter card to the SFP socket.  This design would allow the user to select an SGMII SFP module to use in his application of our PCB.  Hope this make it clear.  Thanks again!

    Best Regards,

    Chester

  • 0 in reply to Chester Kronke
    TI__Expert 5670 points
    Hi Chester,

    The SGMII interface on DP83867 is SGMII PHY. That means it needs to be connected to a SGMII MAC.

    You are trying to design DP83867 on the host board with SFP and copper media. My understanding is that SGMII SFP module has SGMII PHY in it, so the SGMII on the host board has to be SGMII MAC which DP83867 does not support.

    If your application only for fiber SFP (Not SGMII SFP), I would suggest to use DP83869 www.ti.com/.../DP83869HM with 1000BASE-X-to-1000BASE-T or 100BASE-FX-to-100BASE-TX Media Conversion mode.

    Regards,

    Hung Nguyen
  • 0 in reply to Hung Nguyen92
    Prodigy 230 points

    Thanks again for your reply Hung! 

    I'm a bit confused by the preface in your suggestion "If your application only for fiber SFP (Not SGMII SFP)".  SFPs are intended to provide Media-Independent Interface (MII, RMII, RGMII, SGMII, etc.).  Our objective is to provide as wide a compatibility for SFP modules as possible.  By "fiber SFP only" did you mean like 100BASE-FX, -SX, -LX10, -BX10?  I thought those were are all legacy or older fiber standards.  Can the DPS3869 not handle the more recent/modern standards for SFP support? 

    Regarding the DPS3869EVM Evaluation Board, I assume this it the proper evaluation board we need to evaluate this part for our application.  I see that we can order it directly from TI.  Who do I contact to find out if it is actually in stock?

  • 0 in reply to Chester Kronke
    TI__Expert 5670 points
    Hi Chester,

    The small form-factor pluggable (SFP) standard is mainly for Serdes, not parallel interfaces (MII, RMII, GMII, or RGMII). There are differences between 100Base-FX fiber SFP, 1000Base-X fiber SFP and SGMII SFP with 10/100/1000Base-T. Like what I mentioned earlier, the SGMII SFP typically has a SGMII-to-copper PHY on it. Fiber SFP is simpler and similar to optical transceiver.

    DP83869 does support 100Base-FX and 1000Base-X which you can design to connect to Fiber SFP.

    DP83869 has recently been released. I'm sure the EVM is in stock.

    Since you're going to evaluate DP83869, I would like to close this thread which relates to DP83867.

    If you need further support on DP83869, kindly open a new thread.

    Regards,

    Hung Nguyen
  • 0 in reply to Hung Nguyen92
    Prodigy 230 points

    Hung,

    Thanks again!  We have ordered the DP83869EVM and will proceed as you suggested.  If I have any further questions on that I'll open a new thread as you suggest.

    Best Regards,

    Chester