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Last Post 01 Jun 2012 08:36 AM by
Article: L138 -- UART0 muxed with Ethernet PHY on MII Bus
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01 Jun 2012 08:36 AM
    Q: How is the OMAP-L138 SOM-M1 UART0 used, since the signal lines are muxed with the Ethernet PHY on the MII bus?

    UART0 is muxed as the MII bus for the Ethernet PHY on the
    module. You may be able to get access to the UART0 interface by putting
    the ethernet into isolate mode, and then changing the pinmux of the MII
    bus (assuming you do not need access to the ethernet at the same time).

    The data sheet for the LAN8710 chip is located here:

    You can refer to section 4.14.1 for information on how to program the
    PHY registers, and section 5.1 for register information. The bit to set
    the chip into isolate mode is bit 10 of register 0. Please note that the
    Ethernet chip is not put into isolate mode on startup, so this procedure
    will need to be repeated after every power cycle.

    PRODUCTS Included:
    OMAP-L138, AM1808, C6748
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