Datasheet

IIO Functional Description
48 Intel
®
Xeon
®
Processor E7-2800/4800/8800 v2 Product Family
Datasheet Volume Two: Functional Description, February 2014
6.3.3.1 Port Bifurcation
Port bifurcation for each of the three ports is configured via BIOS.
6.3.3.2 Lane Reversal
Lane reversal is supported on all PCI Express ports, regardless of the link width i.e.
lane reversal works in x16, x8, x4 and x2 link widths.
Figure 6-2. PCI Express Lane Partitioning
Transaction TransactionTransaction
Link
Physical
LinkLink
PhysicalPhysical
Port 0
DMI / PCIe
Port 2
PCIe
Port 3
PCIe
x4 x4 x4 x4 x4 x4 x4 x4x4
x8 x8 x8 x8
x16 x16
IOU2 IOU0 IOU1
DMI Port 2a Port 2b Port 2c Port 2d Port 3a Port 3b Port 3c Port 3d
Port 2a Port 2c Port 3a Port 3c
Port 2a Port 3a
0...3 4...70...3 8...11 12...15 0...3 4...7 8...11 12...15