Southbridge Link Interface - Dell PowerEdge R815 Technical Manual

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7.5

SouthBridge Link Interface

The SB Link connects the SR5650 IOB with the AMD Southbridge SP5100. The SB Link
(A-Link Express) is equivalent to an x4 PCIe Gen 1 link with a transfer rate of 1 GB/s in
each direction.
SP5100 is a highly integrated SouthBridge controller, supporting the following
functions:

PCI Bus 32-bit Interface Rev 2.3 running at 33 MHz

Serial ATA (SATA) ports with transfer rates up to 300 MB/s (PowerEdge R815
supports one SATA port for optical devices)

Five OHCI (full-speed 1.1) and two EHCI (high-speed 2.0) USB host controllers,
with up to 12 USB general purpose ports and 2 USB embedded ports (PowerEdge
R815 uses six of these ports for internal and external use from the general
purpose ports)

Power management interface (ACPI 3.0b compliant)

Integrated Micro Controller (IMC) and thermal management (the iDRAC
interfaces the Hardware Thermal Control (HTC) on PowerEdge R815)

I/O interrupt controller

SMBus 2.0 controller

Low Pin Count (LPC) interface to Super I/O, Trusted Platform Module (TPM),
and SPI-VU

Serial Peripheral Interface (SPI) support for up to two devices (4MB BIOS flash is
connected to the SP5100 using SPI interface)
Dell PowerEdge R815 Technical Guide
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