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X-Ref Target - Figure 4-7 
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• Input Reference frequency – This is the frequency of the clock that is coming from the on-board clock source. There can be three reference clocks: PSS_REF_CLK, PS ALT REF CLK, and PSU VIDEO REF CLK. PSS ALT REF CLK and PSU VIDEO REF CLK are enabled based on the user section in the I/O Configuration tab.
• GT Lane Reference frequency – This is the frequency of the clock that is coming from the on-board clock source. There can be individual reference clock sources for PCIe, SATA, Display Port and USB.
• Peripheral Reference frequency – This section lists the clock pins and the input frequencies for the peripherals where the clock is driven by MIO pins. Note that MIOCLK for the corresponding peripherals needs to be enabled in the I/O Configuration page for the pin to be listed here.