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DP83867IR: 10/100 M operation only

Part Number: DP83867IR

From DP83867 PHY I'd like to use only two pairs of MDI ports like  A and B (or C and D in mirror mode)
to connect them to the Magnetics/Connector because of 10/100 M operation only.

Are there any recommendations what I have to do with both unused MDI analog I/O ports?
The datasheet only shows the wiring for all four channels, but give no hint in case of using only two of them.

In this forum I saw different answers like pull resistors and leave pins open. But, whats best practice? 

Is there any suggestion from TI's side?

  • Hi Oliver,

    You can leave channel C and D MDI ports as NC.

    Another recommendation is on the magnetics:

    If you are using an external magnetics instead of an integrated magjack, make sure the 75R resistors towards the RJ-45 are connected to prevent any issues during EMC tests.

    Thanks,
    Rahul