Technical Product Specification

Functional Architecture Intel® Server Boards S5520HC, S5500HCV, and S5520HCT TPS
Revision 1.9
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:
 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
 Fully-coherent write cache with inbound write combining
 Read Current command support
 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.‖