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ECB-865
ECB-865 User’s Manual 7
2.3.1 82815 GMCH and 82801BA
The Intel® 815 chipset for use with the universal socket 370 is a high-flexibility chipset
designed to extend from the basic graphics/multimedia PC platform up to the mainstream
performance desktop platform. The chipset consists of the Intel_ 82815 Graphics and
Memory Controller Hub (GMCH) and an I/O Controller Hub (ICH or ICH2) for the I/O
subsystem. The GMCH integrates a system memory SDRAM controller that supports a
64-bit 100/133 MHz SDRAM array.
The Intel 82815 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 for use with the
universal socket 370. 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 for use with the universal socket 370 supports the following
processors:
Intel® Pentium® III processor based on 0.18 micron technology (CPUID = 068xh).
These processors support the AGTL+ bus interface
Intel® Celeron™ processor based on 0.18 micron technology (CPUID = 068xh). This
applies to Celeron 533A MHz and ≥ 566 MHz processors. These processors support
the AGTL+ bus interface.
Future 0.13 micron socket 370 processors. These processors support the AGTL bus
interface.
The 82815 GMCH along with the 82801BA ICH2 provide the basic functionality and buses
of the system:
Interface to SDRAM, 64-bit data bus. Up to 3 double sided DIMMs at 100 MHz
system memory bus. Up to 2 double sided or 3 single sided DIMMs at 133 MHz
system memory bus.
PCI Rev 2.2 compliant with support for 33 MHz PCI operations, Supports up to 6
Req/Gnt pairs
System Management Bus (SMBus) compatible with most I2C devices
Integrated IDE controller support Ultra ATA/100/66/33 with two 40-pin connectors
2 USB ports integrated in ICH2.
Integrated LAN controller
AC.97 2.1 compliant link for audio and telephony codecs up to 6 channels
Low Pin Count (LPC) interface
Firmware Hub (FWH) interface support
.