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Original question:

BQ24074: Charging stopped at 3.8V

AM3352: RMII interface RXER pin missing

HY yang
Expert 1980 points
Part Number: AM3352


One of our customers used am3352 to design a gateway product.

The first version of the prototype uses am3352's rgmii interface to connect to ksz9897, and is now ready to use.

Now the terminal customer has increased the demand and needs to connect a lan8720 on the rmii2 interface, but the rxer of rmii2 is used by uart4. Excuse me, if the rxer of rmii2 interface of am3352 is used as uart4 and the rxer pin of rmii2 is missing, can rmii2 still work normally?

  • 0
    TI__Mastermind 28265 points

    I will assume  that you are using the ZCZ package for AM335x.  With this assumption, the RMII2_RXER and UART4_TXD signals share the U17 pin.  

    While RMII2_RXER is on;ly available on pin U17, the UART4_TXD signal is available on several other pins.  Would it be possible to use one of this other pins and thereby free pin U17 for RMII2_RXER?

    You should be able to use the V4 Pinmux Tool to validate the use case and ensure that valid IOSets are being selected. 

    --Paul