Foxconn NFPIK8AA-8EKRS - Manual (Page 45)

37
Chapter 2 Installation Instructions
Termination Enable Jumper: J3A2
This jumper is used to enable or disable internal differential termination for PCI
Express reference clock input pins.
PE_REFCLK Select Jumper: J3A1
This jumper is used to select the resource for PCI Express PLL reference clock.
Internal clock
reference
(Default)
External
clock
reference
J3A1
Termination
enabled
(Default)
Termination
disabled
J3A2
Warning:
The following four jumpers set only for technical support. We
strongly recommend that users not make any change to these
jumpers, otherwise it may cause serious damage to the board.
The function descriptions herein are just for your reference only.