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DP83826E: Difference between normal ETH PHYs and ETH PHYs supporting EtherCAT interface

Nikhil Jadhav
Prodigy 100 points
Part Number: DP83826E
Other Parts Discussed in Thread: DP83869

Hello, we are using TI ETH PHY in one of our designs. We also implemented DP83867IRRGZT and DP83869HMRGZT with Sitara series processor AM6421BSFGHAALV in prototype board.

While exploring ETH PHYs, I came across few ETH PHYs which supports EtherCAT interface e.g. DP83826E and DP83822.

I tried to analyze difference between both types of PHYs for a difference at interface level, but both seem quite similar.

Please help to answer below queries:

1) What is the difference between both types of PHYs at interface level?

2) There are only few PHYs that mentions about EtherCAT support. Does that mean EtherCAT cannot be implemented on normal PHYs like DP83867 and DP83869?

3) Are there any specific processors which are needed to support EtherCAT or Can we use any processor?

Regards,

Nikhil Jadhav

  • +1
    TI__Mastermind 25148 points

    Hi Nikhil,

    [1] There is no significant difference at the interface level, but there are differences in the speeds and features offered between each PHY.

    [2] EtherCAT can be implemented on DP83867 and DP83869. Please refer to Beckhoff's PHY Selection Guide appnote for more details on the EtherCAT requirements for PHYs and SoCs. DP83867 and DP83869 are mentioned in this appnote as PHYs that are compatible with EtherCAT applications.

    [3] There are specific processor requirements to support EtherCAT. Please refer to the above guide for more details on these requirements.

    I believe we can also support EtherCAT on Sitara processors, as documented here:

    https://www.ti.com/lit/wp/spry187i/spry187i.pdf

    Thank you,

    Evan