815 Chipset Platform Owner Manual

Introduction

20 Intel

815 Chipset Platform Design Guide

1.3.2.2 Intel

82801AA I/O Controller Hub (ICH)

The I/O Controller Hub provides the I/O subsystem with access to the rest of the system, as

follows:

• Upstream accelerated hub architecture interface for access to the GMCH

• PCI 2.2 interface (6 PCI Request/Grant pairs)

• Bus master IDE controller; supports Ultra ATA/66

• USB controller

• I/O APIC

• SMBus controller

• FWH interface

• LPC interface

• AC’97 2.1 interface

• Integrated system management controller

• Alert on LAN*

• IRQ controller

• Packaging/Power

 241 BGA

 3.3V core and 1.8V and 3.3V standby

1.3.2.3 Firmware Hub (FWH)

The hardware features of the firmware hub include:

• An integrated hardware Random Number Generator (RNG)

• Register-based locking

• Hardware-based locking

• 5 GPIs

• Packaging/Power

 40-L TSOP and 32-L PLCC

 3.3V core and 3.3V / 12V for fast programming