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User’s Manual
6 ECB-870 User’s Manual
2.3.1 82845 MCH and 82801BA
The Intel® 845 chipset is designed, validated, and optimized for the Intel Pentium 4
processor with NetBurst micro-architecture using proven and established building blocks.
Intel 845 chipset-based platforms extend the Intel Pentium 4 processor capabilities with a
great balance of price and performance for applied computing segments.
The Intel 82845 MCH 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 845 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 82845 Memory Controller Hub (MCH) supports a 400 MHz system bus, PC133
SDRAM memory or DDR200/266 memory and the latest graphics devices through the
1.5V AGP4X interface. The 82801BA I/O Controller Hub (ICH2) makes a direct
connection to the graphics and memory for faster access to peripherals. It provides the
features and bandwidth required for applied computing usage models. The ICH2 is
already one of the highest volume PC platform products in the world, supporting
motherboards based on the Intel® 815, Intel® 810, and Intel® 850 chipsets.
The MCH is in a 593 pin FC-BGA package and contains the following functionality:
Supports single Pentium® 4 processor configuration at 400 MHz
AGTL+ system bus with integrated termination supporting 32-bit system bus
addressing
Up to 2 GB (w/ 512 Mb technology) of DDR200/266 SDRAM
1.5 V AGP interface with 4x SBA/data transfer and 2x/4x fast write capability
8 bit, 66 MHz 4x hub interface to the ICH2
Distributed arbitration for highly concurrent operation
The ICH2 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 MCH and ICH2 communicate over a dedicated hub interface. The
82801BA ICH2 Functions and capabilities include:
PCI Rev 2.2 compliant with support for 33 MHz PCI operations
Supports up to 6 Request/Grant pairs (PCI slots)
Power management logic support
Enhanced DMA controller, interrupt controller, and timer functions
Integrated IDE controller; Ultra ATA/100/66/33