DE2-115 Datasheet, PDF (109/116 Pages) Altera Corporation – The DE2-115 package contains all components needed to use the DE2-115 board in conjunction with a computer that runs the Microsoft Windows OS.

Figure 6-28 RGMII interface MAC Configuration
In the MAC Options tab (See Figure 6-29), users should set up proper values for the PHY chip
88E1111. The MDIO Module should be included, as it is used to generate a 2.5MHz MDC clock for
the PHY chip from the controller's source clock(here a 100MHz clock source is expected) to divide
the MAC control register interface clock to produce the MDC clock output on the MDIO interface.
The MAC control register interface clock frequency is 100MHz and the desired MDC clock
frequency is 2.5MHz, so a host clock divisor of 40 should be used.
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