Intel E7-8891 v2 CM8063601377422 User Manual

Product codes
CM8063601377422
Page of 504
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
Transaction
Transaction
Link
Physical
Link
Link
Physical
Physical
Port 0
DMI / PCIe
Port 2
PCIe
Port 3
PCIe
x4
x4
x4
x4
x4
x4
x4
x4
x4
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...7
0...3
8...11
12...15
0...3
4...7
8...11
12...15
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