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TMDSHSECDOCK: Connection between TMS320F28388D and control card

Part Number: TMDSHSECDOCK
Other Parts Discussed in Thread: TMS320F28388D, C2000WARE, TMDSCNCD28388D, DP83640

Hi, 

I am little confused with connection between TMS320F28388D and control card. I am trying to use MII interface to connect a external PHY.

Here is the GPIOs I chose to connect to PHY

Then I checked TMS320F2838x datasheet to identify where the pins locates. 

But when I was trying to connect these pins on the deck. I found there are two pins ENET_MII_RX_DATA_2 and ENET_MII_RX_DATA_3 that are not connecting to GPIO. See the yellow highlight.

Would you mind explaining why is that? Thanks. 

Regards,

Cheng