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

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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
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

AGP G raphics Card
Display Cache
(AGP in-line m em ory
®
Intel 815 Chipset Platform Design Guide
82815 Graphics and Memory Controller Hub (GMCH) and the Intel
or
AG P 2X/4X
m odule)
Analog display out
Digital video out
2x USB
2x IDE
Audio codec
AC97
Modem codec
Processor
66/100/133 MHz system bus
Chipset
G MCH
(544 BGA)
Hub interface
ICH
FW H Flash
BIO S
Introduction
®
82801AA I/O
100/133 MHz
SDRAM
PCI bus
PCI slots
LPC I/F
KBC/SIO
sys_blk
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