Compaq 4000N, 4000S Chapter 7 POWER and SIGNAL DISTRIBUTION

Technical Reference Guide

Compaq Deskpro 4000N and 4000S Personal Computers

First Edition - September 1997

7-1

AC Input To

System

Board &

Drives

Chapter 7POWER and SIGNALDISTRIBUTION

7. Chapter 7 POWER SUPPLY AND DISTRIBUTION

7.1 INTRODUCTION

This chapter describes the power supply and method of general power and signal distribution in

the Compaq Deskpro 4000N and 4000S Personal Computers. All models use a 76-watt power

supply assembly. Power distribution is basically similar in all models. Topics covered in this

chapter include:

♦ Power supply assembly/control (7.2) page 7-1

♦ Power distribution (7.3) page 7-4

♦ Signal distribution (7.4) page 7-6

7.2 POWER SUPPLY ASSEMBLY/CONTROL

This system features a power supply that is controlled through programmable logic (Figure 7-1).

This allows several options for how and when the system can be powered up.

Figure 7–1. Power Supply Assembly, Block Diagram

Power Supply

Assembly

Power

Control

Logic

+5 VDC

-5 VDC

+12 VDC

-12 VDC

+3.5 VDC

Power On

Power

Button S

y

stem Board

PS On Fan Off- +5 AUX

NIC

I/O Controller

PINTA

On Cntrl

Fan

Fan Pwr

SW1 -6

Contents

Main Page NOTICE Page TABLE OF CONTENTS Page Page Page Page Technical Reference Guide Compaq Deskpro 4000N and 4000S Personal Computers viii LIST OF FIGURES LIST OF TABLES Page Chapter 1 INTRODUCTION 1. Chapter 1 INTRODUCTION 1.1 ABOUT THIS GUIDE 1.1.1 USING THIS GUIDE 1.1.2 ADDITIONAL INFORMATION SOURCES Page Compaq Deskpro 4000N and 4000S Personal Computers 1-3 1.3 COMMON ACRONYMS AND ABBREVIATIONS Chapter 1 Introduction 1-4 Compaq Deskpro 4000N and 4000S Personal Computers Table 1-1. Acronyms and Abbreviations Compaq Deskpro 4000N and 4000S Personal Computers 1-5 Table 1-1. Acronyms and Abbreviations n Chapter 1 Introduction 1-6 Compaq Deskpro 4000N and 4000S Personal Computers Table 1-1. Acronyms and Abbreviations Page 2.2 FEATURES 2.2.1 STANDARD FEATURES 2.2.2 MODEL DIFFERENCES 2.2.3 OPTIONS 2.3 MECHANICAL DESIGN 2.3.1 CABINET LAYOUT Page 2.3.2 CHASSIS LAYOUT 2-7 2.3.3 SYSTEM BOARD LAYOUT Figure 25. System Board Layout, Component Side System Board p/n 006582-xxx (4000S) or p/n 007602-xxx (4000N) 2.4 SYSTEM ARCHITECTURE Figure 26. Compaq Deskpro 4000N and 4000S System Architecture, Block diagram 2-9 2.4.1 MICROPROCESSOR 2.4.2 MEMORY 2.4.3 SUPPORT CHIPSET 2.4.4 MASS STORAGE 2.4.5 SERIAL AND PARALLEL INTERFACES 2.4.6 UNIVERSAL SERIAL BUS INTERFACE 2.4.7 GRAPHICS SUBSYSTEM 2.5 SPECIFICATIONS Chapter 2 System Overview 2-14 Compaq Deskpro 4000N and 4000S Personal Computers Table 27. Diskette Drive Specifications Table 2-7. Diskette Drive Specifications Table 28. 8x CD-ROM Drive Specifications Table 2-8. 20x CD-ROM Drive Specifications Page Page Chapter 3 PROCESSOR/ MEMORY SUBSYSTEM 3. Chapter 3 PROCESSOR/MEMORY SUBSYSTEM 3.1 INTRODUCTION 3.2 PENTIUM MMX-BASED PROCESSOR/MEMORY SUBSYSTEM 3.2.1 PENTIUM MMX MICROPROCESSOR 3.2.1.1 MMX Technology 3.2.2 BUS/PROCESSING SPEED SELECT 3.2.3 SECONDARY (L2) CACHE MEMORY 3.2.4 SYSTEM MEMORY Chapter 3 Processor/Memory Subsystem Compaq Deskpro 4000N and 4000S Personal Computers 3-6 Table 35. SPD Address Map (SDRAM DIMM) Table 3-5. SPD Address Map (SDRAM DIMM) Compaq Deskpro 4000N and 4000S Personal Computers 3-7 Figure 3-3 shows the system memory map. Figure 33. System Memory Map 3.2.5 SUBSYSTEM CONFIGURATION Chapter 4 SYSTEM SUPPORT 4. Chapter 4 SYSTEM SUPPORT 4.1 INTRODUCTION 4.2 PCI BUS OVERVIEW 4.2.1 PCI CONNECTOR 4.2.2 PCI BUS MASTER ARBITRATION 4.2.3 PCI BUS TRANSACTIONS 4.2.3.1 I/O and Memory Cycles 4.2.3.2 Configuration Cycles Page Page 4.2.3.3 Special Cycles 4.2.4 OPTION ROM MAPPING 4.2.5 PCI INTERRUPT MAPPING 4.2.6 PCI CONFIGURATION 4.3 ISA BUS OVERVIEW 4.3.1 ISA CONNECTOR 4.3.2 ISA BUS TRANSACTIONS Page 4.3.3 DIRECT MEMORY ACCESS 4.3.3.1 Page Registers 4.3.3.2 DMA Controller Registers 4.3.4 INTERRUPTS 4.3.4.1 Maskable Interrupts Page 4.3.4.2 Non-Maskable Interrupts NMI- Generation SMI- Generation 4.3.5 INTERVAL TIMER 4.3.6 ISA CONFIGURATION 4.4 SYSTEM CLOCK DISTRIBUTION 4.5 REAL-TIME CLOCK AND CONFIGURATION MEMORY 4.5.1 CONFIGURATION MEMORY BYTE DEFINITIONS 4-26 RTC Control Register A, Byte 0Ah RTC Control Register B, Byte 0B h RTC Status Register C, Byte 0Ch RTC Status Register D, Byte 0Dh Page Page Page 4-30 Configuration Byte 26h, Auxiliary Peripheral Configuration Configuration Byte 29h, Miscellaneous Configuration Data Configuration Byte 27h, Speed Control/External Drive Configuration Byte 28h, Expanded and Base Memory, IRQ12 Select Compaq Deskpro 4000N and 4000S Personal Computers 4-31 Configuration Byte 2Ah, Hard Drive Timeout Configuration Byte 2Bh, System Inactivity Timeout Configuration Byte 2Ch, ScreenSave and NUMLOCK Control Page Page Page Page Page Page 4-38 Configuration Byte 94h, ROM Flash/Power Button Status Configuration Byte 97h, Asset/Test Prompt Byte Configuration Byte 9Bh, Ultra-33 DMA Enable Byte Configuration Byte 9Ch, Mode-2 Configuration Byte Page Page Compaq Deskpro 4000N and 4000S Personal Computers 4-41 4.6 I/O MAP AND REGISTER ACCESSING This section describes the system I/O map an d m et h ods of accessing various system functions. 4.6.1 SYSTEM I/O MAP Table 417. System I/O Map Table 4-17. System I/O Map 4.6.2 87307 I/O CONTROLLER CONFIGURATION Page 4.7 SYSTEM MANAGEMENT SUPPORT 4.7.1 FLASH ROM WRITE PROTECT 4.7.2 PASSWORD PROTECTION 4.7.3 I/O SECURITY 4.7.4 USER SECURITY 4.7.5 TEMPERATURE SENSING 4.7.6 POWER MANAGEMENT 4.7.6.1 HARD DRIVE SPINDOWN CONTROL 4.7.6.2 DISPLAY MONITOR POWER MANAGEMENT CONTROL Chapter 5 INPUT/OUTPUT INTERFACES 5. Chapter 5 INPUT/OUTPUT INTERFACES 5.1 INTRODUCTION 5.2 ENHANCED IDE INTERFACE 5.2.1 IDE PROGRAMMING 5.2.1.1 IDE Configuration Registers 5.2.1.2 IDE Bus Master Control Registers 5.2.1.3 IDE ATA Control Registers Page Page Page 5-7 Drive Control Register, I/O Port 3F6h/376h (Write Only) Drive Access Register, I/O Port 3F7h/377h (Read Only) 5.2.2 IDE CONNECTORS Page 5.3 DISKETTE DRIVE INTERFACE 5.3.1 DISKETTE DRIVE PROGRAMMING 5.3.1.1 Diskette Drive Interface Configuration 5.3.1.2 Diskette Drive Interface Control Page Chapter 5 Input/Output Interfaces 5-14 Compaq Deskpro 4000N and 4000S Personal Computers 5.3.2 DISKETTE DRIVE CONNECTOR 5.4 SERIAL INTERFACES 5.4.1 RS-232 INTERFACE 5.4.2 SERIAL INTERFACE PROGRAMMING 5.4.2.1 Serial Interface Configuration 5.4.2.2 Serial Inte rface Control Page Page Page 5.5 PARALLEL INTERFACE 5.5.1 STANDARD PARALLEL PORT MODE 5.5.2 ENHANCED PARALLEL PORT MODE 5.5.3 EXTENDED CAPABILITIES PORT MODE 5.5.4 PARALLEL INTERFACE PROGRAMMING 5.5.4.1 Parallel Interface C o nfiguration 5.5.4.2 Parallel Inte rface Control Page Page 5.5.5 PARALLEL INTERFACE CONNECTOR 5.6 KEYBOARD/POINTING DEVICE INTERFACE 5.6.1 KEYBOARD INTERFACE OPERATION Page 5.6.2 POINTING DEVICE INTERFACE OPERATION 5.6.3 KEYBOARD/POINTING DEVICE INTERFACE PROGRAMMING 5.6.3.1 8042 Configuration 5.6.3.2 8042 Control Chapter 5 Input/Output Interfaces 5-32 Compaq Deskpro 4000N and 4000S Personal Computers 5-33 Table 5-18. CPU Commands To The 8042 5.6.4 KEYBOARD/POINTING DEVICE INTERFACE CONNECTOR 5.7 ETHERNET INTERFACE 5.7.1 NIC CONFIGURATION/CONTROL 5.7.2 NIC CONNECTORS 5.8 UNIVERSAL SERIAL BUS INTERFACE 5.8.1 USB CONFIGURATION 5.8.2 USB CONTROL 5.8.3 USB CONNECTOR Chapter 6 GRAPHICS SUBSYSTEM 6. Chapter 6 GRAPHICS SUBSYSTEM 6.1 INTRODUCTION 6.2 SUBSYSTEM DESCRIPTION 6.2.1 S3 TRIO64V2/GX GRAPHICS CONTROLLER 6.2.2 S3 TRIO64V2/GX GRAPHICS CONFIGURATIONS 6.2.3 S3 TRIO64V2/GX GRAPHICS SUBSYSTEM PROGRAMMING 6.2.3.1 Subsystem Configuration 6.2.3.2 Subsystem Control 6.2.4 MONITOR POWER CONTROL 6.2.5 CONNECTORS Chapter 7 POWER and SIGNAL DISTRIBUTION 7. Chapter 7 POWER SUPPLY AND DISTRIBUTION 7.1 INTRODUCTION 7.2 POWER SUPPLY ASSEMBLY/CONTROL 7.2.1 POWER SUPPLY ASSEMBLY 7.2.2 POWER CONTROL 7.3 POWER DISTRIBUTION 7.3.1 3.5/5/12 VDC DISTRIBUTION 7.3.2 LOW VOLTAGE DISTRIBUTION Chapter 7 Power and Signal Distribution Compaq Deskpro 4000N and 4000S Personal Computers 7-6 7.4 SIGNAL DISTRIBUTION Figure 74. Signal Distribution Diagram Figure 7-4 shows general signal distribution between the main subassemblies of the system unit. System Board Riser Card Chapter 8 BIOS ROM 8. Chapter 8 BIOS ROM 8.1 INTRODUCTION 8.2 BOOT FUNCTIONS 8.2.1 BOOT BLOCK 8.2.2 QUICKBOOT 8.2.3 SILENTBOOT 8.3 ACCESSING CONFIGURATION MEMORY 8.3.1 ACCESSING CMOS 8.3.2 SETTING DEFAULT PARAMETERS 8.3.2.1 INT 15, AX=E841h, BL=00h - Set CMOS Defaults 8.3.2.2 INT 15, AX=E841h, BL=01h - Set System Board Device Defaults 8.3.3 ACCESSING CMOS FEATURE BITS 8.4 CLIENT MANAGEMENT SUPPORT Page 8.4.1 SYSTEM ID 8.4.2 SYSTEM INFORMATION TABLE Chapter 8 BIOS ROM Compaq Deskpro 4000N and 4000S Personal Computers 8-8 8-9 Chapter 8 BIOS ROM Compaq Deskpro 4000N and 4000S Personal Computers 8-10 8-11 8.4.3 TEMPERATURE SENSOR 8.4.4 DRIVE FAULT PREDICTION 8.4.5 DIMM SUPPORT Page 8.4.6 SECURITY FUNCTIONS 8.4.7 ACCESSING CMOS FEATURE BITS 8.5 PNP SUPPORT 8.6 POWER MANAGEMENT SUPPORT Page Page Appendix A ERROR MESSAGES AND CODES A. Appendix A ERROR MESSAGES AND CODES A.1 INTRODUCTION A.2 POWER-ON MESSAGES A.3 BEEP CODE MESSAGES Compaq Personal Computers A.4 POWER-ON SELF TEST (POST) MESSAGES Table A3. Power-On Self Test (POST) Messages Table A-3. Power-On Self Test (POST) Messages A-3 A.5 PROCESSOR ERROR MESSAGES (1xx-xx) Table A4. Processor Error Messages Table A-4. Processor Error Messages Compaq Personal Computers A-4 A.6 MEMORY ERROR MESSAGES (2xx-xx) Table A5. Memory Error Messages Table A-5. Memory Error Messages A.7 KEYBOARD ERROR MESSAGES (30x-xx) Table A6. Keyboard Error Messages Table A-6. Keyboard Error Messages A.8 PRINTER ERROR M ESSAGES (4xx- xx) A.9 VIDEO (GRAPHICS) ERROR MESSAGES (5xx-xx) A.10 DISKETTE DRIVE ERROR MESSAGES (6xx-xx) A.11 SERIAL INTERFACE ERROR MESSAGES (11xx-xx) A-7 A.12 MODEM COMMUNICATIONS ERROR MESSAGES (12xx-xx) Compaq Personal Computers A-8 A.13 HARD DRIVE ERROR MESSAGES (17xx-xx) Table A12. Hard Drive Error Messages Table A-12. Hard Drive Error Messages A-9 A.14 HARD DRIVE ERROR MESSAGES (19xx-xx) Table A13. Hard Drive Error Messages Table A-13. Hard Drive Error Messages A.15 VIDEO (GRAPHICS) ERROR MESSAGES (24xx-xx) Table A14. Hard Drive Messages Table A-14. Hard Drive Error Messages A.16 AUDIO ERROR MESSAGES (3206-xx) A.17 NETWORK INTERFACE ERROR MESSAGES (60xx-xx) A-11 A.18 SCSI INTERFACE ERROR MESSAG ES (65xx-xx, 66xx- xx, 67xx-xx) Table A17. SCSI Interface Error Messages Table A-17. SCSI Interface Error Messages A.19 POINTING DEVICE INTERFACE ERROR MESSAGES (8601-xx) A.20 CEMM PRIVILEDGED OPS ERROR MESSAGES A.21 CEMM EXCEPTION ERROR MESSAGES Appendix B ASCII CHARACTER SET B. Appendix B ASCII CHARACTER SET B.1 INTRODUCTION Appendix B ASCII Character Set B-2 Table B-1. ASCII Code Set Appendix C KEYBOARD C. Appendix C KEYBOARD C.1 INTRODUCTION C.2 KEYSTROKE PROCESSING C.2.1 TRANSMISSIONS TO THE SYSTEM Compaq Personal Computers C-4 C.2.2 KEYBOARD LAYOUTS C.2.2.1 Standard Enhanced Keyboards Figure C4. National (102-Key) Keyboard Key Positions Figure C3. U.S. English (101-Key) Keyboard Key Positions C-5 C.2.2.2 Windows Enhanced Keyboards Figure C6. National Windows (102W-Key) Keyboard Key Positions Figure C5. U.S. English Windows (101W-Key) Keyboard Key Positions Compaq Personal Computers C-6 C.2.2.3 Windows Enhanced Keyboards w/Erase-Ease Figure C8. National Windows (102WE-Key) Keyboard Key Positions Figure C7. U.S. English Windows (101WE-Key) Keyboard Key Positions C.2.3 KEYS C.2.3.1 Special Single-Keystroke Functions C.2.3.2 Multi-Keystroke Functions C.2.3.3 Windows Keystrokes C.2.3.4 Erase-Ease Keystrokes C.2.4 KEYBOARD COMMANDS C.2.5 SCAN CODES C-11 Table C2. Keyboard Scan Codes Table C-2. Keyboard Scan Codes Compaq Personal Computers C-12 Table C-2. Keyboard Scan Codes C-13 Table C-2. Keyboard Scan Codes C.3 SCANNER DESCRIPTION C.3.1 SCANNER OPERATION Compaq Personal Computers Figure C10. Scanner operation Flow Chart C-16 C.3.1.1 Resolution/Shade Depth C.3.1.2 Image Quality C.3.2 SCANNER INTERFACE C.3.2.1 Pnyb Mode C.3.2.2 Mser Mode (MacIntosh Connection Only) C.3.3 SCANNER SPECIFICATIONS/REQUIREMENTS INDEX I.