PCI Express Backplane Usage
JXT6966 / JXTS6966 Technical Reference
CHASSIS PLANS
4-2
chipset. The IOB33 edge connector mates with a backplane’s PCIe Expansion slot. This extra link is
useful in supporting an additional system card slot. Refer to the
IOB Expansion Board - Appendix D
for
more information the IOB33 and the
PCI Express Reference
chapter for more information on the PCI
Express signal routings to the SHB edge connectors.
The figures below show some typical SHB and backplane combinations that would result in all of the PCI
Express slots successfully establishing communication with the SHB host device. The first figure shows a
server-class SHB; the second shows a graphics-class SHB.
PCI Express link configuration straps for each PCI Express option card slot on a PICMG 1.3 backplane are
required as part of the PICMG 1.3 SHB Express®
specification. These configuration straps alert the SHB
as to the specific link configuration expected on each PCI Express option card slot. PCI Express
communication between the SHB and option card slots is successful only when there are enough available
PCI Express links established between the PICMG 1.3 SHB and each PCI Express slot or device on the
backplane.
For more information, refer to the PCI Industrial Manufacturers Group’s
SHB Express® System Host
Board PCI Express Specification, PICMG
®
1.3
.
