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AM3359 BeagleBone Pin Mux configuration

Andrea Sorio
Intellectual 265 points

Hi

I'm trying to replicate the beagle bone pin out assignment with pin mux tool.

Starting from scratch I assigned the GEMAC CPSW to IO set 1. This

configuration doesn't assign the RMII1 REFCLK to H18 pin.

If I set this connection "manually" the tool reports an IO set violation.

How can assign these signal without violation error?

Thank you in advance

Best Regards

Andrea Sorio

  • 0
    TI__Guru 62955 points

    GEMAC CPSW IO set 1 only configures port1 to MII mode, which does use RMII_REFCLK.  What type of PHY are connecting to each GEMAC CPSW port?

    Regards,
    Paul

  • 0 in reply to peaves
    Intellectual 265 points

    Dear Paul

    Yes! I saw , the pin RMII_REFCLK should not be connected.

    However I have to use an SMSC LAN8710A

    Thank you

    Best Regards

    Andrea

  • 0 in reply to Andrea Sorio
    TI__Guru 62955 points

    The LAN8710 can be configured to operate in MII or RMII mode.  It only needs the 50 MHz RMII reference clock when operating in RMII mode.  I assume you are trying to operate in MII mode since you were selecting IO set 1 in the pin mux tool.  If you are operating the LAN8710 in RMII mode you should be selecting one of the other IO sets that supports RMII.

    Note: Please read the AM335x Silicon Errata and make sure you account for any issues related to Ethernet.  For example, there is one usage note and a few Advisories that describe limitations related to Ethernet , especially Advisory 1.0.16 if you plan to use RMII mode.

    Regards,
    Paul

  • 0 in reply to peaves
    Intellectual 265 points

    Dear Paul

    Yes, I would like to use the MII, I already saw the errata.

    Thank you very much indeed for your help!!

    Regards

    Andrea