Compaq iPAQ 1.0 Technical Reference 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 SUB-BUSSES .............................................................................................................. 4-5
4.2.3 PCI CONFIGURATION ..................................................................................................... 4-6
4.3 SYSTEM RESOURCES ............................................................................................................. 4-7
4.3.1 INTERRUPTS..................................................................................................................... 4-7
4.3.2 DIRECT MEMORY ACCESS .......................................................................................... 4-10
4.4 SYSTEM CLOCK DISTRIBUTION ........................................................................................ 4-11
4.5 REAL-TIME CLOCK AND CONFIGURATION MEMORY ................................................. 4-11
4.5.1 CLEARING CMOS........................................................................................................... 4-12
4.5.2 CMOS ARCHIVE AND RESTORE ................................................................................. 4-12
4.5.3 STANDARD CMOS LOCATIONS .................................................................................. 4-13
4.6 SYSTEM MANAGEMENT...................................................................................................... 4-22
4.6.1 SECURITY FUNCTIONS ................................................................................................ 4-22
4.6.2 POWER MANAGEMENT................................................................................................ 4-23
4.6.3 SYSTEM STATUS ........................................................................................................... 4-24
4.6.4 TEMPERATURE SENSING AND COOLING ................................................................ 4-25
4.7 REGISTER MAP AND MISCELLANEOUS FUNCTIONS.................................................... 4-26
4.7.1 SYSTEM I/O MAP ........................................................................................................... 4-26
4.7.2 82801 ICH GENERAL PURPOSE FUNCTIONS ............................................................ 4-27
4.7.3 I/O CONTROLLER FUNCTIONS .................................................................................. 4-28
4.7.4 820802 FWH FUNCTIONS .............................................................................................. 4-30
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 PRIMARY IDE INTERFACE............................................................................................. 5-3
5.2.3 SECONDARY IDE INTERFACE....................................................................................... 5-4
5.3 DISKETTE DRIVE INTERFACE .............................................................................................. 5-5
5.4 SERIAL INTERFACE ................................................................................................................ 5-6
5.4.1 RS-232 INTERFACE .......................................................................................................... 5-6
5.4.2 SERIAL TEST INTERFACE............................................................................................. 5-7
5.4.3 SERIAL INTERFACE PROGRAMMING ......................................................................... 5-7
5.5 PARALLEL INTERFACE .......................................................................................................... 5-9
5.5.1 STANDARD PARALLEL PORT MODE........................................................................... 5-9
5.5.2 ENHANCED PARALLEL PORT MODE .......................................................................... 5-9
5.5.3 EXTENDED CAPABILITIES PORT MODE .................................................................. 5-10
5.5.4 PARALLEL INTERFACE PROGRAMMING ................................................................. 5-10
5.5.5 PARALLEL INTERFACE CONNECTOR ....................................................................... 5-14
5.6 KEYBOARD/POINTING DEVICE INTERFACE................................................................... 5-15
5.6.1 KEYBOARD INTERFACE OPERATION....................................................................... 5-15
5.6.2 POINTING DEVICE INTERFACE OPERATION .......................................................... 5-17
5.6.3 KEYBOARD/POINTING DEVICE INTERFACE PROGRAMMING........................... 5-17
5.6.4 KEYBOARD/POINTING DEVICE INTERFACE CONNECTOR.................................. 5-21
5.7 UNIVERSAL SERIAL BUS INTERFACE .............................................................................. 5-22
5.7.1 USB DATA FORMATS.................................................................................................... 5-23
5.7.2 USB PROGRAMMING .................................................................................................... 5-24
5.7.3 USB CONNECTOR .......................................................................................................... 5-25
5.7.4 USB CABLE DATA ......................................................................................................... 5-25
iv Compaq iPAQ Series of Desktop Personal Computers
Second Edition -- February 2001