WinFast NF4K8AB User Manual page 33

PEX PLL REFCLK Select Jumper: J3A1
This jumper is used to select the resource for PCI
Express PLL reference clock.
PEX REFCLK Jumper: J1G1
This jumper is used to select common-mode level
range for PCI Express external reference clock input
pins.
Recovery Jumper: J1E1
This jumper is reserved for technology support,
please do not change the jumper.
Chapter 2 Installation Instructions
NF4K8AB Series User Manual
External
clock
reference
Internal clock
reference
(Default)
PE_REFCLK Select Jumper
above VDD/2
below VDD/2
(Default)
PEX REFCLK Jumper
1
Closed
(Default)
2
1
Open
2
Recovery Jumper
25