RX Gmii Clk Src - 16.2 English

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

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16.2 English
Receive GMII Clock Source
Selects the clock source for the receive path and the GMII RX interface. RxGmiiClkSrc=RXOUTCLK is not supported for the 2.5G data rates. The fabric elastic buffer is not required when RXOUTCLK is selected because the RX datapath is synchronous to the recovered clock. Therefore, the SGMII Capabilities tab for SGMII speed selection is not required.

Valid values: TXOUTCLK (Default) and RXOUTCLK