Using the Client-Side GMII for the 1000BASE-X Standard - 16.2 English

1G/2.5G Ethernet PCS/PMA or SGMII LogiCORE IP Product Guide (PG047)

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16.2 English

It is not within the scope of this document to define the Gigabit Media Independent Interface (GMII)— see clause 35 of the IEEE 802.3-2008 specification for information about the GMII. Timing diagrams and descriptions are provided only as an informational guide. For 2.5G mode, the GMII interface is over-clocked at 312.5 MHz.