TYAN S5567 Instructions Manual page 24

PEX8_16: PEX8 or PCIEX16 Select Header
Pin Signal Name
1 Pull High
DFG[5]: PCI Express Bifurcation
2 High: 1 x16 PCI Express* (Default)
Low: 2 x8 PCI Express
3 Pull Low
Pins 1&2 closed: High: 1 x16 PCI Express*
Pins 2&3 closed: Low: 2 x8 PCI Express
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24
(Default)