Using the Ethernet XGMII Interface
You use the Efinity Interface Designer to implement an Ethernet XGMII block
and configure it. The CMN_REFCLK0 pin is a dedicated package pin.
Tip: The Ethernet XGMII interface is complicated. If you find yourself turning a
lot of options on and off to enable or disable features, some of the GUI menus might get out
of sync. Therefore, Efinix suggests that you note the settings you want, and
then start fresh with a newly created Ethernet XGMII block with only the settings you
want.