Intel 815 - System Features; Figure 1. System Block Diagram

Introduction
R
Intel
®
815 Chipset Platform Design Guide 17
elimination of ISA provides true plug-and-play for the platform. Traditionally, the ISA interface
was used for audio and modem devices. The addition of AC’97 allows the OEM to use software-
configurable AC’97 audio and modem coder/decoders (codecs), instead of the traditional ISA
devices.
1.3.1 System Features
The Intel 815 chipset for use with the Universal Socket 370 platform contains two components:
the Intel
®
82815 Graphics and Memory Controller Hub (GMCH) and the Intel
®
82801AA I/O
Controller Hub (ICH). The GMCH integrates a 66/100/133 MHz, P6 family system bus controller,
integrated 2D/3D graphics accelerator or AGP (2X/4X) discrete graphics card, 100/133 MHz
SDRAM controller, and a high-speed accelerated hub architecture interface for communication
with the ICH. The ICH integrates an Ultra ATA/66 controller, USB host controller, LPC interface
controller, FWH interface controller, PCI interface controller, AC’97 digital controller, and a hub
interface for communication with the GMCH.
Figure 1. System Block Diagram
sys_blk
Processor
GMCH
(544 BGA)
ICH
KBC/SIO
AGP Graphics Card
or
Display Cache
(AGP in-line memory
module)
AGP 2X/4X
Analog display out
Digital video out
66/100/133 MHz system bus
Hub interface
100/133 MHz
SDRAM
PCI slots
FWH Flash
BIOS
2x USB
2x IDE
Audio codec
Modem codec
AC97
LPC I/F
PCI bus
Chipset