Intel 815 Manuel D’Utilisation

Intel® 815 Chipset: Graphics Controller PRM, Rev 1.0

2. Intel

815 Chipset Overview

The chipset consists of an Intel

82815 chipset Graphics and Memory Controller Hub (GMCH), an I/O

Controller Hub (ICH) for the I/O subsystem, and a Firmware* Hub (FWH). The GMCH integrates a
system memory SDRAM controller that supports a 64-bit 100/133 MHz SDRAM array. The Intel

815

chipset family includes:

• Intel

815 chipset: This chipset consists of the Intel

82815 chipset GMCH, the 82801AA ICH,

and the 82802AB/82802AC FWH.

• Intel

815E chipset: This chipset consists of the Intel

82815 chipset GMCH, the 82801BA ICH2,

and the 82802AB/82802AC FWH.

The Intel

82815 chipset GMCH integrates a Display Cache SDRAM controller that supports a 32-bit

133 MHz SDRAM array for enhanced integrated 2D and 3D graphics performance. Multiplexed with the
display cache interface is an AGP controller interface to enable graphics configuration and upgrade
flexibility with the Intel

815 chipset. The AGP interface and the internal graphics device are mutually

exclusive. When the AGP port is populated with an AGP graphics card, the integrated graphics is
disabled; thus, the display cache interface is not needed.

The Intel

815 chipset family uses a hub architecture with the Intel

82815 chipset GMCH as the host

bridge hub and the I/O Controller Hub (ICH) as the I/O hub. The Intel

815 chipset supports the

82801AA ICH and the Intel

815E chipset supports the 82801BA ICH2. The ICH is a highly integrated

multifunctional I/O Controller Hub that provides the interface to the PCI Bus and integrates many of the
functions needed in today’s PC platforms. The GMCH and ICH communicate over a dedicated hub
interface.