Foxconn NFPIK8AA-8EKRS - Manual (Page 47)

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Chapter 2 Installation Instructions
Common Mode Level Select Jumper (for CK8-04-I04): J7
This jumper is used to select common-mode level range for PCI Express external
reference clock input pins.
Common
mode below
VDD/2
(Default)
Common
mode above
VDD/2
J7