Ref Des
Location
Description
Notes
J4B1
PCI Express Slot 2
J4B2
PCI Express Slot 3
PCH Root Complex (2.5 GT/
s Max)
The PCI Express Ports comply with PCI
Express* Base Specification, Rev. 1.0a. All
PCI Express slots (3, 4, 5, 6) employ
physical x8 connectors regardless of
whether they are x1, x4, or x8. This
enables use of x8 cards even if the actual
bandwidth and functionality is less.
J3B1
PCI Express Slot 4
J2B2
PCI Express Slot 5
J2B1
PCI Express Slot 6
PCI Express Hot-Plug is not supported.
1.12
PCH EndPoint PCIe Configuration
This section provides details on how to configure the PCIe for the supported Intel
®
Communications Chipset 89xx Series SKU.
Table 7.
Intel
®
Communications Chipset 89xx Series SKUs
Intel
®
Communications Chipset 89xx Series
SKU
PCIe Width
#3
x8
The PCH EndPoint can operate as a x4, x8, or x16 depending on the SKU and
population of the headers below.
Table 8.
Intel
®
Xeon
®
Processor E3-1125C PCIe Port0 Configuration
J6F6
CFG<6>
Bit
J6E4
CFG<5>
Bit
Intel
®
Xeon
®
Processor E3-1125C Port Bifurication
1
1
x16
1
0
x8 & x8
0
1
Reserved
0
0
x8, x4 & x4
The Intel
®
Communications Chipset 89xx Series EndPoint also supports lane reversal.
Lane Reversal and Polarity Inversion must be done at a port level on the processor
part (as outlined below).
Table 9.
Intel
®
Xeon
®
Processor E3-1125C PCIe Lane Reversal
Jumper
PCIe x16 - Lane Reversal
J6E5 - Closed
PCIe x16 - No Lane Reversal (Default)
J6E5 - Open
PCIe x4 - Lane Reversal
J6E6 - Closed
PCIe x4 - No Lane Reversal (Default)
J6E6 - Open
In addition to the above headers, additional headers affect the PCIe training at boot-
up.
Introduction—Crystal Forest
Intel
®
Xeon
®
Processor E3-1125C with Intel
®
Communications Chipset 8910 Development Kit
October 2012
User Guide
Order No.: 328009-001US
15