How to turn on PEX_CLK0_P (at pin E15) and PEX_CLK0_N (at pin E14)

I have a custom carrier board for Jetson AGX Orin and need to turn on the PCIe reference clock at pins E14 and E15. How do I do that? Thanks.

please refer to
https://docs.nvidia.com/jetson/archives/r35.6.0/DeveloperGuide/HR/JetsonModuleAdaptationAndBringUp/JetsonAgxOrinSeries.html?highlight=pcie#enable-pcie-in-a-customer-cvb-design

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