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Reverse MII mode support

Varun M R
Prodigy 100 points


Hi,

   Can I Interface the C6000 series DSPs with a Controller in Reverse MII mode, If possible how will the Management interface look like (MDC, MDIO).

  • 0
    TI__Mastermind 46460 points

    I am not certain what you mean by Reverse MII mode.

    The MII interface is defined as a connection between a MAC and a PHY.  There is synchronous data transport in both directions but both the RX and TX clocks come from the PHY.  Our C6000 DSPs implement the MAC interface.  They expect to receive both RX and TX clocks from the PHY.  Our C6000 DSPs to not have the ability to source these clocks.

    The serial management interface (MDC and MDIO) is independent of the MII interface.  Our C6000 DSPs present a master serial management interface .  They drive the serial clock (MDC) and all data transfer over the bi-directional data pin (MDIO) is at its request.

    Tom

     

  • 0 in reply to Tom Johnson 16214
    Prodigy 100 points

    Actually the scenario  is , the Host controller(CPU) is having two more MII inteface to which FE phys are connected so naturally the MDC/MDIO are also used. This host supports a Rev MII interface where by it can act as a PHY , I would like to interface the C6000 series DSP to this interface, Now my concern is, If I can interface it directly to this Host(PHY) interface , Is there a need for MDIO/MDC interface.

     

  • 0 in reply to Varun M R
    TI__Mastermind 46460 points

    There is no need to use the serial management interface.  The MII operates fully independent of the SMI.  SMI implementaiton is optional.

    If you are planning to bootload the DSP over the MII interface, be sure to check whether the C6000 device of interest supports a bootmode that properly configures the MII interface for this operation.

    Tom