User Guide • PC3-ALLEGRO • CompactPCI
®
PlusIO CPU Board • Intel® i7-3xxx Processor
PCI Express® Interface
The PC3-ALLEGRO is provided with several PCI Express (PCIe) lanes for I/O expansion. Four PCI Express
Gen 2 lanes (5GT/s), originating from the QM77, are available at the backplane connector J2. Another
four PCI Express lanes are provided by the Intel Core
TM
i7 processor to the J-PCIE connector. A small
DIP switch (DS-P) located on the backside of the board are used to configure different lane widths to
each of both downstream interfaces and to choose the interface transfer rate. Possible settings are
<
Single link x 4 lanes to J-PCIE
<
Four links x 1 lane to J-PCIE
<
2.5GT/s or 5GT/s transfer speed
See section “Configuration PCI Express Switch (DS-P)” for details.
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