82801DB Datasheet, PDF (30/587 Pages) Intel Corporation – Intel 82801DB I/O Controller Hub 4 (ICH4)

Introduction
1.2
Overview
The ICH4 provides extensive I/O support. Functions and capabilities include:
• PCI Local Bus Specification, Revision 2.2-compliant with support for 33 MHz PCI operations.
• PCI slots ( supports up to 6 Req/Gnt pairs)
• ACPI Power Management Logic Support
• Enhanced DMA controller, Interrupt controller, and timer functions
• Integrated IDE controller supports Ultra ATA100/66/33
• USB host interface with support for 6 USB ports; 3 UHCI host controllers; 1 EHCI high-speed
USB 2.0 Host controller
• Integrated LAN controller
• System Management Bus (SMBus) Specification, Version 2.0 with additional support for I²C
devices
• Supports Audio Codec ’97, Revision 2.3 specification (a.k.a., AC ’97 Component
Specification, Revision 2.3) Link for Audio and Telephony codecs (up to seven channels)
• Low Pin Count (LPC) interface
• Firmware Hub (FWH) interface support
• Alert On LAN* (AOL) and Alert On LAN 2* (AOL2)
The ICH4 incorporates a variety of PCI functions that are divided into three logical devices
(29, 30, and 31) on PCI Bus 0 and one device on Bus 1. Device 30 is the Hub Interface-To-PCI
bridge. Device 31 contains all the other PCI functions, except the USB controllers and the LAN
controller, as shown in Table 1-2. The LAN controller is located on Bus 1.
Table 1-2. PCI Devices and Functions
Bus:Device:Function
Bus 0:Device 30:Function 0
Bus 0:Device 31:Function 0
Bus 0:Device 31:Function 1
Bus 0:Device 31:Function 3
Bus 0:Device 31:Function 5
Bus 0:Device 31:Function 6
Bus 0:Device 29:Function 0
Bus 0:Device 29:Function 1
Bus 0:Device 29:Function 2
Bus 0:Device 29:Function 7
Bus n:Device 8:Function 0
Function Description
Hub Interface to PCI Bridge
PCI to LPC Bridge
IDE Controller
SMBus Controller
AC ’97 Audio Controller
AC ’97 Modem Controller
USB UHCI Controller #1
USB UHCI Controller #2
USB UHCI Controller #3
USB 2.0 EHCI Controller
LAN Controller
30
Intel^® 82801DB ICH4 Datasheet