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XIO1100: Clock part Suggestion

Part Number: XIO1100
Other Parts Discussed in Thread: LMK6H

Hi,

As we are using this XIO1100 PCIE express PHY in our design. In datasheet for REFCLK+ and REFCLK- they have mentioned to provide clock source, Do I need to give external clock generator or oscillator?

If yes, kindly suggest the clock generator part for both the configuration of differential 100MHz and Signle ended 125MHz.