HP Deskpro EX Technical Reference Manual page 10

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 ......................................................................................................4-33
4.7.1 SECURITY FUNCTIONS.................................................................................................4-33
4.7.2 POWER MANAGEMENT ................................................................................................4-35
4.7.3 SYSTEM STATUS............................................................................................................4-35
4.7.4 TEMPERATURE SENSING.............................................................................................4-36
4.8 SYSTEM COOLING.................................................................................................................4-37
4.9 REGISTER MAP AND MISCELLANEOUS FUNCTIONS ....................................................4-38
4.9.1 SYSTEM I/O MAP............................................................................................................4-38
4.9.2 82801 ICH GENERAL PURPOSE FUNCTIONS.............................................................4-39
4.9.3 LPC47B357 I/O CONTROLLER FUNCTIONS...............................................................4-40
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 SERIAL INTERFACE PROGRAMMING..........................................................................5-9
iv Compaq Deskpro EX Series of Personal Computers
First Edition -- August 2000