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TM4C1292NCPDT: RMII to RMII Communications

Joseph Hancock38
Intellectual 615 points
Part Number: TM4C1292NCPDT

Hi,

I'm looking to use the TM4C1292NCPDT in an ethernet switch device.  Will this microcontroller support direct MAC to MAC connection with a device such as the KSZ9897R or is the use of a standalone PHY required? 

Thanks,

Joe

  • 0
    TI__Guru**** 184366 points
    Hi,
    The TM4C1292NCPDT does not have the on-chip PHY. Normally, you will need to have an external PHY that will interface to the MCU using either the MII or RMII interface. Looks like the KSZ9879R has two configurable MII/RMII ports so you should be able to connect to one of these ports directly. Since we are not experts of the Microchip Ethernet switch, it will be better if you can consult them for technical details such as if a PHY is needed in between.
  • 0 in reply to Charles Tsai
    Intellectual 615 points

    Hi Charles,

    My intention was to connect MAC to MAC in a crossover configuration.  I am hoping to avoid the extra expense, size, and power of the standalone PHY which is why I am looking at using the TM4C1292 over the TM4C1294.  What is the software impact of this configuration?  Is there any software/driver support for this configuration?

    Thanks,

    Joe

  • 0 in reply to Joseph Hancock38
    TI__Guru**** 184366 points
    Hi Joseph,
    Here is a link to a TI reference design that uses TM4C129 with an external PHY connected via the MII interface. Hopefully this example will help you get started. www.ti.com/.../TIDA-00226
  • 0 in reply to Charles Tsai
    Intellectual 615 points

    Hi Charles,

    Thanks for the response.  I have been pulled to another project but will review this information when I get another opportunity.

    Thanks,

    Joe

  • 0 in reply to Joseph Hancock38
    TI__Guru**** 184366 points
    Hi Joe,
    I will close this thread for now. If you have questions you can reopen this thread or open a new thread.