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AM5706: AM5706 PCIe reference Clock driver

Part Number: AM5706

I am using AM5706 as PCIe 1.0  two Root-complex of x1 lane

We are following two approach for the ref clock of PCIe.

One is providing external input to PCIe Clk. What is the input/Output driver of LJCB_CLKP. Is it HCSL or LVDS?

The latter one is, output from LJCB_CLKP is buffered to other endpoints. 

So, if it is an HCSL output, I have to provide external 50 Ohm termination to gnd right?