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

  1. #1
    New Member New Member Alberto-g is on a distinguished road
    Join Date
    Oct 2017

    Ethercat back-to back MII connection, no PHY.

    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:

    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.


  2. #2

    Infineon Employee
    Infineon Employee
    jferreira will become famous soon enough
    Join Date
    Oct 2012
    Hi Alberto,

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

    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.

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