Intel C2518 FH8065501516710 Scheda Tecnica
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FH8065501516710
Intel
®
Atom™ Processor C2000 Product Family for Microserver
September 2014
Datasheet, Vol. 2 of 3
Order Number: 330061-002US
233
Volume 2—PCI Express Root Ports (RP)—C2000 Product Family
Configuration of PCI Express Ports and Link Widths
12.8
Configuration of PCI Express Ports and Link Widths
The PCI Express interface consists of up to 16 physical lanes and up to four Root Port
controllers, depending on product SKU. For a given SKU, the number of available lanes
and controllers may be further reduced and configured using soft straps and bifurcation
settings.
shows the supported configurations assuming all 16 lanes and 4
controllers are available.
• Product SKU dictates the maximum number of supported physical lanes and Root
Port Controllers. Reference to
• Bifurcation may organize the remaining available lanes and controllers.
• During Link training, lane reversal may occur on a per-controller basis.
• During Link training, lane reversal may occur on a per-controller basis.
Interfacing with a x8 PCIe device is supported with bifurcation to either:
• One controller as x16.
• Two controllers, each up to x8 wide.
• Three controllers, one up to x8 wide and two up to x4 wide.
• Two controllers, each up to x8 wide.
• Three controllers, one up to x8 wide and two up to x4 wide.
With degraded operation:
• A 16-lane link connected to a x8, x2 or x1 PCIe device.
• An 8-lane link connected to a x2 or x1 PCIe device.
• A 4-lane link connected to a x2 or x1 PCIe device.
• An 8-lane link connected to a x2 or x1 PCIe device.
• A 4-lane link connected to a x2 or x1 PCIe device.
Since the smallest bifurcation granularity is x4 (for 4 controllers), attached PCIe x2 or
x1 devices each require a four-lane controller for connection.
Table 12-6. Lane and Root Port Controller Configurations
Number of
Root Port
Controllers
Enabled
PCIe* Device Link-Widths Supported
(Number of Lanes)
Description
One
x16, x8, x4, x2, x1
For the single controller configuration
Two
x8, x4, x2, x1 and
x8, x4, x2, x1
x8, x4, x2, x1
Independent selection per controller
Three
x8, x4, x2, x1 and
x4, x2, x1 and
x4, x2, x1
Independent selection per controller
One wide channel and two narrow channels
All Four
x4, x2, x1 and
x4, x2, x1 and
x4, x2, x1 and
x4, x2, x1
Independent selection per controller