User Guide • PC3-ALLEGRO • CompactPCI
®
PlusIO CPU Board • Intel® i7-3xxx Processor
Configuration Jumpers
Configuration PCI Express Switch (DS-P)
The link width and transfer rate of the PCI Express interfaces attached to the local expansion connector
P-PCIE is configurable by two DIP switches (DS-P) located on the backside of the PC3-ALLEGRO. Note
that changes in PCIe link configuration are honoured by the PC3-ALLEGRO not before a system reset
was performed.
DS-P
PCIe Link Width
1
2
PCIe Switch
Upstream
J-PCIE
OFF
OFF
4 Lanes @ 5GT/s
4 Links x 1 Lane @ 5GT/s
ON
OFF
4 Lanes @ 5GT/s
1 Link x 4 Lanes @ 5GT/s
OFF
ON
4 Lanes @ 2.5GT/s
4 Links x 1 Lane @ 2.5GT/s
ON
ON
4 Lanes @ 2.5GT/s
1 Link x 4 Lanes @ 2.5GT/s
1)
Consists to the non fat pipe slots, generally periphery slots 3 to 6.
When the port on J-PCIE is configured as single link, the PCIe switch may size down the link width to
x2 or x1 by auto-negotiation.
ON
1
2
160
.15.02.0
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