Only available when the Physical Interface is set to Internal. This option selects the clock sources for the MAC TX and RX datapaths:
- User Clk2
- This is the default option and when selected, the MAC TX and RX datapaths are clocked by Usrclk2 sourced from the PCS/PMA module.
- RX User Clk2
- When this option is selected, the MAC TX datapath is clocked by Userclk2 and the RX datapath is clocked by RXOUTCLK. Both are sourced from the PCS/PMA module.