Xilinx LogiCORE IP Ethernet AVB Endpoint v2.4 User Manual page 114

Chapter 12: System Integration
Because the TEMAC core can often be used in different clocking modes, note the following:
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The Ethernet transmitter client clock domain must always be connected to the
tx_clk input of the Ethernet AVB Endpoint core. Additionally, the transmitter clock
enable, as used with the TEMAC, must always be connected to the tx_clk_en input
of the Ethernet AVB Endpoint core.
The Ethernet receiver client clock domain must always be connected to the rx_clk
input of the Ethernet AVB Endpoint core. Additionally, the receiver clock enable, as
used with the TEMAC, must always be connected to the rx_clk_en input of the
Ethernet AVB Endpoint core.
The host_clk inputs of the Ethernet AVB Endpoint and of the TEMAC must always
share the same clock source. If desired, this can also be the clock source used for the
PLB interface.
www.xilinx.com Ethernet AVB Endpoint User Guide
UG492 September 21, 2010