HP dc7900 Support Components, System Memory, Support Component Functions, Component Name Function

System Overview

2.3.3 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 2-4 shows the functions provided by the support components.

Table 2-4

Support Component Functions

Component Name	Function
WPCD376H SIO Controller	Keyboard and pointing device I/F
	Diskette I/F [1]
	Serial I/F (COM1and COM2) [2]
	Parallel I/F (LPT1, LPT2, or LPT3) [3]
	PCI reset generation
	Interrupt (IRQ) serializer
	Power button and front panel LED logic
	GPIO ports
	Processor over temperature monitoring
	Fan control and monitoring
	Power supply voltage monitoring
	SMBus and Low Pin Count (LPC) bus I/F
Intel 82567LM Network Interface	10/100/1000 Fast Ethernet network interface controller.
Controller
AD1884A HD Audio Codec	Audio mixer
	Two digital-to-analog stereo converters
	Two analog-to-digital stereo converters
	Analog I/O
	Supports stereo (two-channel) audio streams

NOTE:

[1]Not used in USDT form factor.

[2]Com1 supported only on SFF and CMT form factors. COM2 requires external bracket/cable assembly.

[3]Supported only on SFF and CMT form factors, requires external bracket/cable assembly.

2.3.4System Memory

✎

✎

These systems implement a dual-channel Double Data Rate (DDR2) memory architecture. All models support DDR2 800- and 667-MHz DIMMs. The USDT system provides two SODIMM sockets supporting up to eight gigabytes of memory while the SFF and CMT form factors provide four DIMM sockets and support a total of 16 gigabytes of memory.

DDR and DDR2 DIMMs are NOT interchangeable.

SODIMM and DIMM components are NOT interchangeable.

2-8 www.hp.com Technical Reference Guide