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Technical Reference Guide
2.4.2 CHIPSET
The Intel 845 chipset consists of a Memory Controller Hub (MCH), an enhanced I/O controller
hub (ICH2), and a firmware hub (FWH). Table 2-2 lists the integrated functions provided by the
chipset.
Table 2-2. Chipset Comparison
Table 2-2.
845 Chipset Functions
Component Type Function
82845 MCH AGP 4X interface
SDRAM controller supporting PC133 DIMMs or 266-MHz DDR DIMMs [1]
400-MHz FSB
82801BA ICH2 PCI bus I/F
LPC bus I/F
SMBus I/F
IDE I/F with UATA/100 support
AC ’97 controller
RTC/CMOS
IRQ controller
Power management logic
USB controllers #1 and #2 (supporting up to 4 ports)
Network interface controller
82802 FWH Loaded with Compaq BIOS
Random number generator
NOTE:
[1] Dependent on system board type. System supports one or the other.
2.4.3 SUPPORT COMPONENTS
Input/output functions not provided by the chipset are handled by other support components.
Some of these components also provide “housekeeping” and various other functions as well.
Table 2-3 shows the functions provided by the support components.
Table 2-3. Support Component Functions
Table 2-3.
Support Component Functions
Component Name Function
LPC47B367 I/O Controller Keyboard and pointing device I/F
Diskette I/F
Serial I/F (COM1and COM2)
Parallel I/F (LPT1, LPT2, or LPT3)
AGP, PCI reset generation
Interrupt (IRQ) serializer
Power button logic
GPIO ports
AD1885 Audio Codec Audio mixer
Digital-to-analog converter
Analog-to-digital converter
Analog I/O
Compaq Evo and Workstation Personal Computers
Featuring the Intel Pentium 4 Processor
Second Edition - January 2003
2-15