Intel STL2 manual 2.4.2.3IB6566 South Bridge, 2.4.2.3.1PCI Interface

STL2 Server Board Architecture Overview STL2 Server Board TPS

2.4.2.3IB6566 South Bridge

The IB6566 South Bridge is a PCI device that provides multiple PCI functions in a single package: PCI-to-ISA bridge, PCI IDE interface, PCI USB controller, and power management controller. Each function within the IB6566 South Bridge has its own set of configuration registers. Once configured, each appears to the system as a distinct hardware controller sharing the same PCI bus interface.

On the STL2 baseboard, the primary role of the IB6566 South Bridge is to provide the gateway to all PC-compatible I/O devices and features. The STL2 server board uses the following IB6566 South Bridge features:

∙PCI interface

∙IDE interface

∙USB interface

∙PC-compatible timer/counters and DMA controllers

∙Baseboard Plug-and-Play support

∙General purpose I/O

∙Power management

∙APIC and 82C59 interrupt controller

∙Host interface for AT compatible signaling

∙Internal only ISA bus (no ISA expansion connectors) bridge for communication with Super I/O, BIOS flash and BMC

The following sections describe each supported feature as used on the STL2 server board.

2.4.2.3.1PCI Interface

The IB6566 South Bridge fully implements a 32-bit PCI master/slave interface, in accordance with Revision 2.2 of the PCI Local Bus Specification. On the STL2 server board, the PCI interface operates at 33 MHz, using the 5V-signaling environment.

2.4.2.3.2PCI Bus Master IDE Interface

The IB6566 South Bridge acts as a PCI-based enhanced IDE 32-bit interface controller for intelligent disk drives that have disk controller electronics on-board. The server board includes a single IDE connector, featuring 40 pins (2 x 20) that support a master and a slave device. The IDE controller provides support for an internally mounted CD-ROM.

The IDE controller has the following features:

∙PIO and DMA transfer modes

∙Mode 4 timings

∙Transfer rates up to 33 MBps

∙Buffering for PCI/IDE burst transfers

∙Master/slave IDE mode

∙Support for up to two devices

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