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Technical Reference Guide
Compaq Deskpro EXS and Workstation 300 Personal Computers
Featuring the Intel Pentium 4 Processor
First Edition - December 2000
2-11
2.4.2 CHIPSET
The chipset consists of a Memory Controller Hub (MCH), an I/O Controller Hub (ICH), and a
FirmWare Hub (FWH). Table 2-2 lists the integrated functions provided by the two types of
chipsets used in these systems.
Table 2-2. Chipset Comparison
Table 2-2.
Chipset Comparison
Chipset Component Function
850 82850 MCH AGP 4X interface
Dual-channel RDRAM controller supporting up to 4 PC800 RIMMs
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 I/F (4)
8259 and I/O APIC interrupt processing
82802 FWH Loaded with Compaq BIOS
2.4.3 SUPPORT COMPONENTS
Input/output functions not provided by the chipset are handled by other support components. 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
LPC47B357 7 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
ISA serial IRQ converter
Power button and LED control logic
GPIO ports
ES1373 PCI audio controller
CS4297A Audio Codec Audio mixer
Digital-to-analog converter
Analog-to-digital converter
Analog I/O