Compaq W4000 - Manual (Page 8)

Technical Reference Guide
CHAPTER 4 SYSTEM SUPPORT ..............................................................................................................
4.1 INTRODUCTION....................................................................................................................... 4-1
4.2 PCI
BUS OVERVIEW ................................................................................................................ 4-2
4.2.1 PCI BUS TRANSACTIONS............................................................................................... 4-3
4.2.2 PCI BUS MASTER ARBITRATION ................................................................................. 4-6
4.2.3 OPTION ROM MAPPING ................................................................................................. 4-7
4.2.4 PCI INTERRUPTS.............................................................................................................. 4-7
4.2.5 PCI POWER MANAGEMENT SUPPORT........................................................................ 4-7
4.2.6 PCI SUB-BUSSES .............................................................................................................. 4-7
4.2.7 PCI CONFIGURATION ..................................................................................................... 4-8
4.2.8 PCI CONNECTOR ............................................................................................................. 4-9
4.3 AGP BUS OVERVIEW ............................................................................................................ 4-10
4.3.1 BUS TRANSACTIONS.................................................................................................... 4-10
4.3.2 AGP CONFIGURATION ................................................................................................. 4-13
4.3.3 AGP CONNECTOR.......................................................................................................... 4-14
4.4 SYSTEM RESOURCES ........................................................................................................... 4-15
4.4.1 INTERRUPTS................................................................................................................... 4-15
4.4.2
DIRECT MEMORY ACCESS.......................................................................................... 4-19
4.5 SYSTEM CLOCK DISTRIBUTION ........................................................................................ 4-22
4.6 REAL-TIME CLOCK AND CONFIGURATION MEMORY.................................................. 4-23
4.6.1 CLEARING CMOS........................................................................................................... 4-23
4.6.2 CMOS ARCHIVE AND RESTORE................................................................................. 4-24
4.6.3 STANDARD CMOS LOCATIONS ................................................................................. 4-24
4.7 SYSTEM MANAGEMENT...................................................................................................... 4-25
4.7.1 SECURITY FUNCTIONS ................................................................................................ 4-25
4.7.2 POWER MANAGEMENT ............................................................................................... 4-27
4.7.3 SYSTEM STATUS ........................................................................................................... 4-27
4.7.4 THERMAL SENSING AND COOLING ......................................................................... 4-28
4.8 REGISTER MAP AND MISCELLANEOUS FUNCTIONS .................................................... 4-30
4.8.1 SYSTEM I/O MAP ........................................................................................................... 4-30
4.8.2 LPC47B367 I/O CONTROLLER FUNCTIONS .............................................................. 4-31
CHAPTER 5 INPUT/OUTPUT INTERFACES..........................................................................................
5.1 INTRODUCTION....................................................................................................................... 5-1
5.2 ENHANCED
IDE INTERFACE................................................................................................. 5-1
5.2.1 IDE PROGRAMMING ....................................................................................................... 5-1
5.2.2 IDE CONNECTOR ............................................................................................................. 5-3
5.3 DISKETTE DRIVE INTERFACE .............................................................................................. 5-4
5.3.1 DISKETTE DRIVE PROGRAMMING.............................................................................. 5-5
5.3.2 DISKETTE DRIVE CONNECTOR ................................................................................... 5-7
5.4 SERIAL INTERFACE ................................................................................................................ 5-8
5.4.1 RS-232 INTERFACE.......................................................................................................... 5-8
5.4.2 COM1 PORT HEADER...................................................................................................... 5-9
5.4.3 SERIAL INTERFACE PROGRAMMING......................................................................... 5-9
5.5 PARALLEL INTERFACE........................................................................................................ 5-11
5.5.1 STANDARD PARALLEL PORT MODE ........................................................................ 5-11
5.5.2 ENHANCED PARALLEL PORT MODE........................................................................ 5-12
5.5.3 EXTENDED CAPABILITIES PORT MODE .................................................................. 5-12
5.5.4 PARALLEL INTERFACE PROGRAMMING ................................................................ 5-13
5.5.5 PARALLEL INTERFACE CONNECTOR ...................................................................... 5-15
Compaq Evo and Workstation Personal Computers
Featuring the Intel Pentium 4 Processor
Second Edition –- January 2003
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