Embedded Tri-Mode Ethernet MAC User Guide www.xilinx.com 25UG074 (v2.2) February 22, 2010Ethernet MAC Signal DescriptionsRClock SignalsTable 2-4 shows the clock signals necessary to drive the Ethernet MAC.Table 2-4: Clock SignalsSignal Direction DescriptionPHYEMAC#GTXCLK InputClock supplied by the user to derive the other transmit clocks.Clock tolerance must be within the IEEE Std 802.3-2002specification.EMAC#CLIENTRXCLIENTCLKOUT Output Clock for receive client generated by the clock generator of theEthernet MAC.EMAC#CLIENTTXCLIENTCLKOUT Output Clock for transmit client generated by the clock generator of theEthernet MAC.CLIENTEMAC#RXCLIENTCLKIN Input Clock from receive client for the running of the receiver engine ofthe Ethernet MAC. (1)CLIENTEMAC#TXCLIENTCLKIN Input Clock from transmit client for the running of the transmitterengine of the Ethernet MAC.(1)EMAC#CLIENTTXGMIIMIICLKOUT Output Clock for MII, GMII, and RGMII modules. Generated by the clockgenerator of the Ethernet MAC.CLIENTEMAC#TXGMIIMIICLKIN Input Clock from MII, GMII, and RGMII modules for the running of theMII/GMII/RGMII transmitter layer of the Ethernet MAC. (1)Notes:1. The Ethernet MAC uses this clock to generate an internal clock that eliminates clock skew between the Ethernet MAC and the clientlogic in the FPGA.www.BDTIC.com/XILINX
