Compaq 8000 Technical Reference Guide: HP Compaq 8000 Elite Series Business De - Page 4

Contents 3 Processor/Memory Subsystem 3.1 Introduction 3-1 3.2 Intel Processors 3-2 3.2.1 Intel Processor Overview 3-2 3.2.2 Processor Changing/Upgrading 3-3 3.3 Memory Subsystem 3-4 3.3.1 Memory Upgrading 3-5 3.3.2 Memory Mapping and Pre-allocation 3-5 4 System Support 4.1 Introduction 4-1 4.2 PCI Bus Overview 4-1 4.2.1 PCI 2.3 Bus Operation 4-1 4.2.2 PCI Express Bus Operation 4-3 4.2.3 Option ROM Mapping 4-4 4.2.4 PCI Interrupts 4-4 4.2.5 PCI Power Management Support 4-4 4.2.6 PCI Connectors 4-5 4.3 System Resources 4-7 4.3.1 Interrupts 4-7 4.3.2 Direct Memory Access 4-8 4.4 Real-Time Clock and Configuration Memory 4-9 4.4.1 Clearing CMOS 4-9 4.4.2 Standard CMOS Locations 4-10 4.5 System Management 4-10 4.5.1 Security Functions 4-10 4.5.2 Power Management 4-12 4.5.3 System Status 4-12 4.5.4 Thermal Sensing and Cooling 4-13 4.6 Register Map and Miscellaneous Functions 4-14 4.6.1 System I/O Map 4-14 4.6.2 GPIO Functions 4-16 5 Input/Output Interfaces 5.1 Introduction 5-1 5.2 SATA/eSATA Interface 5-2 5.2.1 SATA Inteerface 5-2 5.5.2 eSATA Interface 5-3 5.3 Serial Interface 5-4 5.4 Parallel Interface Support 5-5 5.4.1 Standard Parallel Port Mode 5-5 5.4.2 Enhanced Parallel Port Mode 5-5 5.4.3 Extended Capabilities Port Mode 5-5 5.4.4 Parallel Interface Connector 5-6 5.5 Keyboard/Pointing Device Interface 5-7 5.5.1 Keyboard Interface Operation 5-7 5.5.2 Pointing Device Interface Operation 5-8 iv www.hp.com Technical Reference Guide