Intel STL2 User Manual
Page 22
STL2 Server Board Architecture Overview
STL2 Server Board TPS
2-14
2.4.2.3 IB6566 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.
2.4.2.3.1 PCI 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.
2.4.2.3.2 PCI 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