Simple question on Cyclone 4 GX usage

I am trying to use the GX transceiver on the GX starter board.

I've used the Mega wizard to generate a sgmii pcs/pma function.

What I don't understand is how the GX pins connect to the sgmii module.

I have gxp_clk , // 125Mhz differential clock pin M7 LVDS

gxn_clk , // 125Mhz differential clock pin N7 LVDS

rxp_data , // 1.4-V PCML pin E2 GXB_RX1

rxn_data , // 1.4-V PCML pin E1 GXB_RX1

txp_data , // 1.4-V PCML pin C2 GxB_TX1

txn_data , // 1.4-V PCML pin C1 GxB_TX1

The mega wizard generated module has

.gxb_cal_blk_clk ( ),

.ref_clk ( ), // MDI interface ??

.txp ( ), // MDI interface ??

.rxp ( ), // MDI interface ??

So how does the 6 GX pins connect to the 4 ports on the sgmii module ?

Is there a specific instantiation of the GX ? How do I specify the GXB_1

transceiver ? Just by virtue of pin assignment ?

I've looked at the TSE design example & cannot find any example of the

hookup. TIA.