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Thread: Ethercat back-to back MII connection, no PHY.

  1. #1
    Beginner Beginner Alberto-g is on a distinguished road
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    Ethercat back-to back MII connection, no PHY.

    Hello,
    I need to connect several XMC4800 on the same board and it would be great to only have two PHY chips, at the beginning and at the end of the Ethercat chain.
    It seems it can be done, page 33: https://download.beckhoff.com/downlo...nology_2i2.pdf

    I wired two relax boards in that way, but it doesn't work right now. I can provide details if needed.

    - Is it supposed to work, or is there something basic that prevents it?
    - Does the driver code needs to be changed? Following Beckhoff recommendation I set enable_enhanced_link_p1 : 0; in xmc_ecat.h and TX shift to 10 ns in DAVE ESC app. Is it enough?
    - Any hint on how to debug this circuit?

    Best regards.

    Alberto

  2. #2

    Infineon Employee
    Infineon Employee
    jferreira will become famous soon enough
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    Hi Alberto,

    It should be possible. Are you using TwinCAT as EtherCAT master? Does it recognize the first slave in the chain?

    Regards,
    Jesus
    The views expressed here are my personal opinions, have not been reviewed or authorized by Infineon and do not necessarily represent the views of Infineon.

  3. #3
    Beginner Beginner
    Infineon Employee
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    MichaelIFX is on a distinguished road
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    MAC2MAC connection demonstrated on XMC4800 Relax Kit

    We have setup a MAC2MAC connection with wild wiring between to XMC4800 Relax Kits and it worked out of the box with our basic example "ETHCAT_SSC_XMC48".
    Please see attachment for details.

    XMC4800 - EtherCAT MAC2MAC connection.pdf
    Last edited by MichaelIFX; May 11th, 2018 at 02:29 AM.
    The views expressed here are my personal opinions, have not been reviewed or authorized by Infineon and do not necessarily represent the views of Infineon.

  4. #4
    Beginner Beginner Alberto-g is on a distinguished road
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    Thank you for your effort, My tests were unsuccessful and the project proceeded with a standard two PHY setup.
    Maybe in a next release we will try again.

    Thanks again

    Alberto

  5. #5
    Beginner Beginner Alberto-g is on a distinguished road
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    Un unrelated question: what is the purpouse of the NC7SZ125M5X buffer on the PHY_RST of the Relax Board?

    Best regards.

    Alberto

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