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DP83848 with MII-Lite (to connect with MPC5748G)

Periyasamy Balasubramanian
Prodigy 215 points

Hi,

I wanted to connect FEC from MPC5748G to PHY DP83848CVV. I'm using both FEC on the MPC5748G so the MCU will support only MII-lite (Signals that are omitted in MII-Lite are TX_ER, RX_ER, COL, and CRS).

Question1. Whether dp83848 PHY will function without the signals (TX_ER, RX_ER, COL, and CRS) _MII-lite  for 10/100mbps.

Question2: Please let me know how this pins to be connected in PHY if I'm not connecting these signals (TX_ER, RX_ER, COL, and CRS) to MCU by default (either pull-up or pulldown ??!!)

Thanks for your support.

Thanks,

Bala.

  • 0
    TI__Mastermind 31600 points
    Bala,

    MII-Lite functionality is primarily associated with the MAC. As you have noted, there are four MII pins that are defined in the IEEE specification that are not used in MII-Lite: TX_ER, RX_ER, COL, and CRS. For an MII-Lite implementation, RX_ER, COL, and CRS are outputs of the PHY and can be left unconnected. TX_ER is an input to the PHY and is used in repeater applications to corrupt transmitted packets. Our current PHYs do not support repeater applications so they would not include this pin.

    Patrick