Compaq EN Series Chapter 4 SYSTEM SUPPORT

Technical Reference Guide

Compaq Deskpro EN Series of Personal Computers

Desktop and Minitower Form Factors

Third Edition - September 1998

4-1

Chapter 4SYSTEM SUPPORT

4. Chapter 4 SYSTEM SUPPORT

4.1 INTRODUCTION

This chapter covers subjects dealing with basic system architecture and covers the following

topics:

♦ PCI bus overview (4.2) page 4-2

♦ AGP bus overview (4.3) page 4-11

♦ ISA bus overview (4.4) page 4-16

♦ System clock distribution (4.5) page 4-28

♦ Real-time clock and configuration memory (4.6)page 4-29

♦ I/O map and register accessing (4.7) page 4-46

♦ System management (4.8) page 4-51

This chapter covers functions provided by off-the-shelf chipsets and therefore describes only basic

aspects of these functions as well as information unique to the Compaq Deskpro EN Series of

Personal Computers. For detailed information on specific components, refer to the applicable

manufacturer’s documentation.

Contents

Main Page Page NOTICE Page TABLE OF CONTENTS Page Page Page Page Technical Reference Guide viii Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors LIST OF FIGURES ix LIST OF TABLES xi 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 1-3 1.3 COMMON ACRONYMS AND ABBREVIATIONS Chapter 1 Introduction Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors 1-4 Table 1-1. Acronyms and Abbreviations 1-5 Table 1-1. Acronyms and Abbreviations n Chapter 1 Introduction Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors 1-6 Table 1-1. Acronyms and Abbreviations Chapter 2 SYSTEM OVERVIEW 2. Chapter 2 SYSTEM OVERVIEW 2.1 INTRODUCTION 2.2 FEATURES AND OPTIONS 2.2.1 STANDARD FEATURES 2.2.2 OPTIONS 2.3 MECHANICAL DESIGN 2.3.1 CABINET LAYOUTS Desktop Minitower Figure 23. Cabinet Layouts, Rear View 2-5 2.3.2 CHASSIS LAYOUTS Page 2.3.3 BOARD LAYOUTS Page 2.4 SYSTEM ARCHITECTURE Figure 28. Compaq Deskpro EN System Architecture, Block diagram 2-11 2.4.1 PROCESSOR 2.4.2 SYSTEM MEMORY 2.4.3 SUPPORT CHIPSETS 2.4.4 MASS STORAGE 2.4.5 SERIAL AND PARALLEL INTERFACES 2.4.6 UNIVERSAL SERIAL BUS INTERFACE 2.4.7 GRAPHICS SUBSYSTEM 2.4.8 AUDIO SUBSYSTEM 2.5 SPECIFICATIONS Chapter 2 System Overview 2-16 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Page Page Page 3.2 PROCESSOR/MEMORY SUBSYSTEM 3.2.1 PROCESSOR 3.2.1.1 Pentium II Processor 3.2.1.2 Celeron Processor 3.2.2 PROCESSOR CHANGING/UPGRADING 3.2.2.1 BIOS Upgrading 3.2.2.2 Processor Speed Selection 3.2.3 SYSTEM MEMORY 3-7 Table 33. SPD Address Map (SDRAM DIMM) Table 3-3. SPD Address Map (SDRAM DIMM) Chapter 3 Processor/Memory Subsystem Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors 3-8 Figure 3-3 shows the system memory map for the system. Figure 34. System Memory Map 3.2.4 SUBSYSTEM CONFIGURATION Page Chapter 4 SYSTEM SUPPORT 4. Chapter 4 SYSTEM SUPPORT 4.1 INTRODUCTION 4.2 PCI BUS OVERVIEW 4-3 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 POWER MANAGEMENT SUPPORT 4.2.7 PCI CONFIGURATION 4.3 AGP BUS OVERVIEW 4.3.1 BUS TRANSACTIONS 4.3.1.1 Data Request 4.3.1.2 Data Transfers AGP 1X Transfers AGP 2X Transfers AGP 4X Transfers 4.3.2 AGP CONFIGURATION 4.3.3 AGP CONNECTOR 4.4 ISA BUS OVERVIEW 4-17 4.4.1 ISA CONNECTOR 4.4.2 ISA BUS TRANSACTIONS Page 4.4.3 DIRECT MEMORY ACCESS 4.4.3.1 Page Registers 4.4.3.2 DMA Controller Registers 4.4.4 INTERRUPTS 4.4.4.1 Maskable Interrupts Page 4.4.4.2 Non-Maskable Interrupts NMI- Generation SMI- Generation 4.4.5 INTERVAL TIMER 4.4.6 ISA CONFIGURATION 4.5 SYSTEM CLOCK DISTRIBUTION 4.6 REAL-TIME CLOCK AND CONFIGURATION MEMORY Page 4-31 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 4-35 Configuration Byte 26h, Auxiliary Peripheral Configuration Configuration Byte 27h, Speed Control/External Drive Configuration Byte 28h, Expanded and Base Memory, IRQ12 Select Chapter 4 System Support 4-36 Desktop and Minitower Form Factors Configuration Byte 29h, Miscellaneous Configuration Data Configuration Byte 2Ah, Hard Drive Timeout Page Page Page Page Page Page 4-43 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 Chapter 4 System Support 4-46 Desktop and Minitower Form Factors 4.7 I/O MAP AND REGISTER ACCESSING 4.7.1 SYSTEM I/O MAP Table 419. System I/O Map Table 4-19. System I/O Map 4.7.2 GPIO UTILIZATION 4.7.2.1 82371 South Bridge GPIO Utilization Page 4.7.2.2 87307 I/O Controller Functions 87307 GPIO Utilization 4.8 SYSTEM MANAGEMENT SUPPORT 4.8.1 FLASH ROM WRITE PROTECT 4.8.2 PASSWORD PROTECTION 4.8.3 I/O SECURITY 4.8.4 USER SECURITY 4.8.5 TEMPERATURE SENSING 4.8.6 SMART COVER LOCK 4.8.7 SMART COVER REMOVAL SENSOR 4.8.8 POWER MANAGEMENT 4.8.8.1 Power Button 4.8.8.2 Fan Control 4.8.8.3 Hard Drive Spindown Control 4.8.8.4 Monitor P o wer Control Page 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 Page 5.2.2 IDE CONNECTOR 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 5-13 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 5-31 Chapter 5 Input/Output Interfaces 5-32 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors Table 5-17. CPU Commands To The 8042 5.6.4 KEYBOARD/POINTING DEVICE INTERFACE CONNECTOR 5.7 UNIVERSAL SERIAL BUS INTERFACE 5.7.1 USB KEYBOARD CONSIDERATIONS 5.7.2 USB CONFIGURATION 5.7.3 USB CONTROL 5.7.4 USB CONNECTOR Page Chapter 6 AUDIO SUBSYSTEM 6. Chapter 6 Audio Subsystem 6.1 INTRODUCTION 6.2 FUNCTIONAL DESCRIPTION Figure 61. Audio Subsystem Block Diagram 6-3 6.2.1 PCM AUDIO PROCESSING 6.2.1.1 ADC Operation 6.2.1.2 DAC Operation 6.2.1.3 PCM Configuration Modes 6.2.1.4 PCM Bus Cycles 6.2.2 FM SYNTHESIS AUDIO PROCESSING 6.3 PROGRAMMING 6.3.1 CONFIGURATION 6.3.2 CONTROL 6.3.2.1 PCM Control 6.3.2.2 FM Synthesis Control 6.4 SPECIFICATIONS Page 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 7.2.2.1 Power Button 7.2.2.2 Power LED Indications 7.2.2.3 PS On Control Select 7.2.2.4 Wake Up Events 7.3 POWER DISTRIBUTION 7.3.1 3.5/5/12 VDC DISTRIBUTION 7.3.2 LOW VOLTAGE DISTRIBUTION 7-7 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 Backplane Board Chapter 7 Power and Signal Distribution Figure 75. Backplane Header Pinouts Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors 7-8 Chapter 8 BIOS ROM 8. Chapter 8 BIOS ROM 8.1 INTRODUCTION 8.2 BOOT/RESET FUNCTIONS 8.2.1 BOOT BLOCK 8.2.2 QUICKBOOT 8.2.3 SILENTBOOT 8.2.4 RESET 8.3 MEMORY DETECTION AND CONFIGURATION 8.4 DESKTOP MANAGEMENT SUPPORT Page 8.4.1 SYSTEM ID 8.4.2 SYSTEM INFORMATION TABLE 8-7 Page 8-9 Chapter 8 BIOS ROM 8-10 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors 8-11 Chapter 8 BIOS ROM 8-12 Compaq Deskpro EN Series of Personal Computers Desktop and Minitower Form Factors 8.4.3 EDID RETRIEVE 8.4.4 DRIVE FAULT PREDICTION 8.4.5 SYSTEM MAP RETRIEVAL 8.4.6 FLASH ROM FUNCTIONS 8.4.7 POWER BUTTON FUNCTIONS 8.4.8 ACCESSING CMOS 8.4.9 ACCESSING CMOS FEATURE BITS Compaq BIOS Technical Reference Guide 8-17 8.4.10 SECURITY FUNCTIONS 8.5 PNP SUPPORT 8.5.1 SMBIOS 8.6 POWER MANAGEMENT FUNCTIONS 8.6.1 INDEPENDENT PM SUPPORT 8.6.2 ACPI SUPPORT 8.6.3 APM SUPPORT Page 8.7 USB LEGACY SUPPORT 8.8 BIOS UPGRADING filename Appendix A ERROR MESSAGES AND CODES A. Appendix A ERROR MESSAGES AND CODES A.1 INTRODUCTION A.2 POWER-ON MESSAGES A.3 BEEP/KEYBOARD LED CODES 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 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.2.4 KEYBOARD COMMANDS C.2.5 SCAN CODES Compaq Personal Computers C-10 Table C2. Keyboard Scan Codes Table C-2. Keyboard Scan Codes C-11 Table C-2. Keyboard Scan Codes Compaq Personal Computers C-12 Table C-2. Keyboard Scan Codes Appendix D COMPAQ 10/100 TX PCI INTEL WOL UTP CONTROLLER CARD D. Appendix D Compaq 10/100 TX PCI Intel WOL UTP Controller Card D.1 INTRODUCTION D.2 FUNCTIONAL DESCRIPTION D.2.1 STATUS INDICATORS D.2.2 CARD POWER AND CLOCK D.2.3 82558 CONTROLLER D.2.4 POWER MANAGEMENT SUPPORT D.2.4.1 APM Environment D.2.4.2 ACPI Environment D.3 CONFIGURATION/CONTROL D.4 RJ-45 CONNECTOR D.5 SPECIFICATIONS Page Appendix E WIDE ULTRA SCSI HOST ADAPTER E. Appendix E Wide Ultra SCSI Host Adapter E.1 INTRODUCTION E.2 FUNCTIONAL DESCRIPTION E.3 SCSI ADAPTER PROGRAMMING E.3.1 SCSI ADAPTER CONFIGURATION E.3.2 SCSI ADAPTER CONTROL E.4 SPECIFCATIONS E.5 USER GUIDELINES E.6 SCSI CONNECTORS Appendix E Wide Ultra SCSI Host Adapter Card E-6 Figure E4. Wide Ultra SCSI Connector (68-pin, as seen from top of card) Table E5. Wide Ultra SCSI Connector Pinout Table E-4. Wide-Ultra SCSI Connector Pinout Appendix F ATI RAGE PRO AGP GRAPHICS CARDS F. Appendix F ATI RAGE PRO AGP 1X/2X Graphics Cards F.1 INTRODUCTION F.2 FUNCTIONAL DESCRIPTION F.2.1 ATI RAGE PRO TURBO AGP GRAPHICS CONTROLLER F.3 DISPLAY MODES F.4 PROGRAMMING F.4.1 CONFIGURATION F.4.2 CONTROL F.4.2.1 Standard VGA Modes F.4.2.2 Extended VGA Modes F.5 MONITOR POWER MANAGEMENT CONTROL F.6 CONNECTORS F.6.1 MEMORY EXPANSION CONNECTOR F.6.2 MONITOR CONNECTOR F.6.3 ATI MULTIMEDIA CHANNEL CONNECTOR INDEX I.