Introduction
This document is intended for Original Equipment Manufacturers and BIOS vendors creating Intel® I/O Controller Hub 9 (ICH9) Family based products. This document is for the following components:
    • Intel® 82801IB ICH9 (ICH9)
    • Intel® 82801IR ICH9 RAID (ICH9R)
    • Intel® 82801IH ICH9 Digital Home (ICH9DH)
    • Intel® 82801IO ICH9 Digital Office (ICH9DO)
    • Intel® 82801IBM ICH9 Mobile (ICH9M)
    • Intel® 82801IEM ICH9 Mobile Enhanced (ICH9M-E)

Overview
The ICH9 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, Revision 3.0b
• 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 four ports (Mobile only) and AHCI support.
• USB host interface with support for up to twelve USB ports; six UHCI host controllers; two EHCI high-speed USB 2.0 Host controllers
• Integrated 10/100/1000 Gigabit Ethernet 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 (Intel® ICH9R, ICH9DH, ICH9DO, ICH9M, and ICH9M-E Only)
• Supports Intel® Active Management Technology (Digital Office only)
• Supports Intel® Virtualization Technology for Directed I/O
• Supports Intel® Trusted Execution Technology
• Low Pin Count (LPC) interface
• Firmware Hub (FWH) interface support
• Serial Peripheral Interface (SPI) support
• Intel® Quiet System Technology (Desktop Only)
• Integrated TPM 1.2 (Mobile Only)