Functional Architecture Intel® Server Boards S5520HC, S5500HCV, and S5520HCT TPS
Revision 1.8
Intel order number E39529-013
20
3.1 Intel
®
5520 and 5500 I/O Hub (IOH)
The Intel
®
5520 and 5500 I/O Hub (IOH) in the Intel
®
Server Boards S5520HC, S5500HCV and
S5520HCT provide a connection point between various I/O components and Intel
®
QPI-based
processors, which includes the following core platform functions:
• Intel
®
QPI link interface for the processor subsystem
• PCI Express* Ports
• Enterprise South Bridge Interface (ESI) for connecting Intel
®
ICH10R
• Manageability Engine (ME)
• Controller Link (CL)
• SMBus Interface
• Intel
®
Virtualization Technology for Directed I/O (Intel
®
VT-d)
The following table shows the high-level features of the Intel
®
5520 and 5500 IOH:
Table 1. IOH High-Level Summary
IOH SKU Intel
®
QPI Ports Supported Processor PCI Express*
Lanes
Manageability
5520 2 Intel
Xeon
Processor 5500 Series 36 Intel
Intelligent Power Node
Manager
5500 2 Intel
Xeon
Processor 5500 Series 24 Intel
Intelligent Power Node
Manager
3.1.1 Intel
®
QuickPath Interconnect
The Intel
®
Server Boards S5520HC, S5500HCV and S5520HCT provide two full-width, cache-
coherent, link-based Intel
®
QuickPath Interconnect interfaces from Intel
®
5520 and 5500 IOH for
connecting Intel
®
QPI based processors. The two Intel
®
QPI link interfaces support full-width
communication only and have the following main features:
z Packetized protocol with 18 data/protocol bits and 2 CRC bits per link per direction
Supporting 4.8 GT/s, 5.86 GT/s, and 6.4 GT/s
z Fully-coherent write cache with inbound write combining
z Read Current command support
z Support for 64-byte cache line size
3.1.2 PCI Express* Ports
The Intel
®
5520 IOH is capable of interfacing with up to 36 PCI Express* Gen2 lanes, which
support devices with the following link width: x16, x8, x4, x2, and x1.
The Intel
®
5500 IOH is capable of interfacing with up to 24 PCI Express* Gen2 lanes, which
support devices with the following link width: x16, x8, x4, x2, and x1.
All ports support PCI Express* Gen1 and Gen2 transfer rates.
For a detailed PCI Express* Slots definition in the Intel
®
Server Boards S5520HC, S5500HCV
and S5520HCT, see “3.5 PCI Subsystem.”
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