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HP Dc7900 Technical Reference Guide: HP Compaq dc7900 Series Business Desktop - Page 24

Support Components, 2.3.4 System Memory, Table 2-4, Support Component Functions - power supply

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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. 2.3.4 System 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

Section	Page
Title	1
Table of Contents	3
Chapter 1 Introduction	7
Introduction	7
1.1 About this Guide	7
1.1.1 Online Viewing	7
1.1.2 Hardcopy	7
1.2 Additional Information Sources	7
1.3 Serial Number	8
1.4 Notational Conventions	8
1.4.1 Special Notices	8
1.4.2 Values	8
1.4.3 Ranges	8
1.5 Common Acronyms and Abbreviations	9
Chapter 2 System Overview	17
System Overview	17
2.1 Introduction	17
2.2 Features	18
2.3 System Architecture	20
2.3.1 Intel Processor Support	22
2.3.2 Chipset	23
2.3.3 Support Components	24
2.3.4 System Memory	24
2.3.5 Mass Storage	25
2.3.6 Serial Interface	25
2.3.7 Universal Serial Bus Interface	25
2.3.8 Network Interface Controller	25
2.3.9 Graphics Subsystem	26
2.3.10 Audio Subsystem	26
2.4 Specifications	27
Chapter 3 Processor/Memory Subsystem	31
Processor/Memory Subsystem	31
3.1 Introduction	31
3.2 Intel Processors	32
3.2.1 Intel Processor Overview	32
3.2.2 Processor Changing/Upgrading	33
3.3 Memory Subsystem	34
3.3.1 Memory Upgrading	35
3.3.2 Memory Mapping and Pre-allocation	35
Chapter 4 System Support	37
System Support	37
4.1 Introduction	37
4.2 PCI Bus Overview	37
4.2.1 PCI 2.3 Bus Operation	37
4.2.2 PCI Express Bus Operation	39
4.2.3 Option ROM Mapping	40
4.2.4 PCI Interrupts	40
4.2.5 PCI Power Management Support	40
4.2.6 PCI Connectors	41
4.3 System Resources	43
4.3.1 Interrupts	43
4.3.2 Direct Memory Access	44
4.4 Real-Time Clock and Configuration Memory	45
4.4.1 Clearing CMOS	45
4.4.2 Standard CMOS Locations	46
4.5 System Management	46
4.5.1 Security Functions	46
4.5.2 Power Management	48
4.5.3 System Status	49
4.5.4 Thermal Sensing and Cooling	49
4.6 Register Map and Miscellaneous Functions	50
4.6.1 System I/O Map	50
4.6.2 GPIO Functions	52
Chapter 5 Input-Output Interfaces	53
Input/Output Interfaces	53
5.1 Introduction	53
5.2 SATA/eSATA Interfaces	54
5.2.1 SATA interface	54
5.2.2 eSATA interface	55
5.3 Diskette Drive Interface	56
5.4 Serial Interface	58
5.5 Parallel Interface Support	59
5.5.1 Standard Parallel Port Mode	59
5.5.2 Enhanced Parallel Port Mode	59
5.5.3 Extended Capabilities Port Mode	59
5.5.4 Parallel Interface Connector	60
5.6 Keyboard/Pointing Device Interface	61
5.6.1 Keyboard Interface Operation	61
5.6.2 Pointing Device Interface Operation	62
5.6.3 Keyboard/Pointing Device Interface Connector	62
5.7 Universal Serial Bus Interface	63
5.7.1 USB Connector	63
5.7.2 USB Cable Data	64
5.8 Audio Subsystem	65
5.8.1 HD Audio Controller	66
5.8.2 HD Audio Link Bus	66
5.8.3 Audio Multistreaming	66
5.8.4 Audio Specifications	67
5.9 Network Interface Controller	68
5.9.1 Wake-On-LAN Support	69
5.9.2 Alert Standard Format Support	69
5.9.3 Power Management Support	69
5.9.4 NIC Connector	70
5.9.5 NIC Specifications	70
Chapter 6 Integrated Graphics	71
Integrated Graphics Subsystem	71
6.1 Introduction	71
6.2 Functional Description	72
6.3 Display Modes	74
6.4 Upgrading	75
6.5 Monitor Connectors	76
6.5.1 Analog Monitor Connector	76
6.5.2 DisplayPort Connector	77
Chapter 7 Power and Signal	79
Power and Signal Distribution	79
7.1 Introduction	79
7.2 Power Distribution	79
7.2.1 USDT Power Distribution	79
7.2.2 SFF/CMT Power Distribution	80
7.2.3 Energy Star Compliancy	83
7.3 Power Control	84
7.3.1 Power Button	84
7.3.2 Wake Up Events	86
7.3.3 Power Management	87
7.4 Signal Distribution	88
Chapter 8 BIOS ROM	91
SYSTEM BIOS	91
8.1 Introduction	91
8.2 ROM Flashing	92
8.2.1 Upgrading	92
8.2.2 Changeable Splash Screen	92
8.3 Boot Functions	93
8.3.1 Boot Device Order	93
8.3.2 Network Boot (F12) Support	93
8.3.3 Memory Detection and Configuration	93
8.3.4 Boot Error Codes	94
8.4 Client Management Functions	95
8.4.1 System ID and ROM Type	96
8.4.2 Temperature Status	96
8.5 SMBIOS	97
8.6 USB Legacy Support	98
8.7 Management Engine Functions	98
Appendix A Error Messages and Codes	99
A.1 Introduction	99
A.2 Beep/Power LED Codes	99
A.3 Power-On Self Test (POST) Messages	100
A.4 System Error Messages (1xx-xx)	103
A.5 Memory Error Messages (2xx-xx)	104
A.6 Keyboard Error Messages (30x-xx)	105
A.7 Printer Error Messages (4xx-xx)	106
A.8 Video (Graphics) Error Messages (5xx-xx)	106
A.9 Diskette Drive Error Messages (6xx-xx)	107
A.10 Serial Interface Error Messages (11xx-xx)	108
A.11 Modem Communications Error Messages (12xx-xx)	109
A.12 System Status Error Messages (16xx-xx)	110
A.13 Hard Drive Error Messages (17xx-xx)	111
A.14 Hard Drive Error Messages (19xx-xx)	113
A.15 Video (Graphics) Error Messages (24xx-xx)	114
A.16 Audio Error Messages (3206-xx)	114
A.17 DVD/CD-ROM Error Messages (33xx-xx)	115
A.18 Network Interface Error Messages (60xx-xx)	115
A.19 SCSI Interface Error Messages (65xx-xx, 66xx-xx, 67xx-xx)	116
A.20 Pointing Device Interface Error Messages (8601-xx)	117