Compaq W4000 manual Support Components, Chipset Functions, Support Component Functions

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.

2.4.3SUPPORT 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 Computers2-15

Featuring the Intel Pentium 4 Processor

Second Edition - January 2003