10
PCI Express Link Capability
The PXIe-62780 backplane provides a configurable PCIe switch fabric, allowing PCI express
link configuration between system slot and PCIe switch fabric to change from 4-link x 4 lanes
(factory default) to 2-link x 8 lanes.
4-link x 4 lanes configuration delivers the most balanced PCI express topology, with all the
peripheral slots sharing equally in system bandwidth.
2-link is installed into PCIe x8 peripheral slots, providing the module with the highest
throughput. For more details, please see “PXIe Link” on page 26.
Connector pin assignments of the PXI Express System Controller Slot, PXI Express
System Timing Slot, PXI Express Hybrid Peripheral Slots, and PXI Express Peripheral
Slots comply with the default pin assignments as defined in PXI-5 PXI Express
hardware specification Rev.1.0.
PXI Express System Controller Slot
The System Controller slot is Slot 1 of the chassis as defined by the PXI specification. The
PXIe-62780 chassis can accommodate a PXI Express system controller that occupies width
up to 4 slots. As defined in the PXI specification, three controller expansion slots allow the
controller to expand to the left to prevent the controller from using up peripheral slots.
PXI Express System Timing Slot
The System Timing (ST) slot is Slot 10, providing one dedicated single-ended star trigger and
3 pairs of differential star trigger lines to each peripheral slot. Routing of single ended star
trigger signals (PXI_STAR) and differential star trigger signals (PXIe_DSTAR) are as follows.
Figure 1-10: Star Trigger Routing
