[INTEL]

Introduction
This document is intended for Original Equipment Manufacturers and BIOS vendors creating Intel® I/O Controller Hub 8 (ICH8) Family based products. This document is the datasheet for the following:
• Intel® 82801HB ICH8 (ICH8)
• Intel® 82801HR ICH8 RAID (ICH8R)
• Intel® 82801HDH ICH8 Digital Home (ICH8DH)
• Intel® 82801HDO ICH8 Digital Office (ICH8DO)
• Intel® 82801HBM ICH8 Mobile (ICH8M)
• Intel® 82801HEM ICH8 Mobile Enhanced (ICH8M-E)

Overview
The ICH8 provides extensive I/O support. Functions and capabilities include:
• PCI Express* Base Specification, Revision 1.1 support
• PCI Local Bus Specification, Revision 2.3 support for 33 MHz PCI operations (supports up to four Req/Gnt pairs).
• ACPI Power Management Logic Support
• Enhanced DMA controller, interrupt controller, and timer functions
• Integrated Serial ATA host controllers with independent DMA operation on up to six ports (Desktop only) or three ports (Mobile only) and AHCI support.
• Integrated IDE controller supports Ultra ATA100/66/33 (Mobile only)
• USB host interface with support for up to ten USB ports; five UHCI host controllers; two EHCI high-speed USB 2.0 Host controllers
• Integrated 10/100/1000 GbE MAC with System Defense
• System Management Bus (SMBus) Specification, Version 2.0 with additional support for I2C devices)
• Supports Intel High Definition Audio
• Supports Intel® Matrix Storage Technology (ICH8, ICH8DH, ICH8DO, and ICH8M-E only)
• Supports Intel® Active Management Technology (ICH8DO and ICH8M-E only)
• Low Pin Count (LPC) interface
• Firmware Hub (FWH) interface support
• Serial Peripheral Interface (SPI) support
• Intel® Quiet System Technology (Desktop only)