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Intel BLKD945GCPE Product Specification - Page 34

Memory Resources

UPC - 735858195201

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Intel Desktop Board D945GCPE Technical Product Specification 2.1 Memory Resources 2.1.1 Addressable Memory The board utilizes 2 GB of addressable system memory. Typically the address space that is allocated for PCI Conventional bus add-in cards, BIOS (SPI Flash), and chipset overhead resides above the top of DRAM (total system memory). On a system that has 2 GB of system memory installed, it is not possible to use all of the installed memory due to system address space being allocated for other system critical functions. These functions include the following: • BIOS/ SPI Flash (4 MB) • Local APIC (19 MB) • Digital Media Interface (40 MB) • Front side bus interrupts (17 MB) • PCI Express configuration space (256 MB) • GMCH base address registers and internal graphics ranges • Memory-mapped I/O that is dynamically allocated for PCI Conventional add-in cards 34

Section	Page
Intel® Desktop Board D945GCPE Technical Product Specification	1
Revision History / Disclaimer	2
Preface	3
Intended Audience	3
What This Document Contains	3
Typographical Conventions	3
Contents	5
1 Product Description	9
1.1 Overview	10
1.1.1 Feature Summary	10
1.1.2 Board Layout	12
1.1.3 Block Diagram	14
1.2 Online Support	15
1.3 Processor	15
1.4 System Memory	16
1.4.1 Memory Configurations	17
1.5 Intel® 945GC Chipset	17
1.5.1 Intel 945GC Graphics Subsystem	17
1.5.1.1 Intel® GMA950 Graphics Controller	17
1.5.1.2 Dynamic Video Memory Technology (DVMT)	18
1.5.1.3 Configuration Modes	19
1.5.2 USB	19
1.5.3 IDE Support	19
1.5.3.1 Parallel ATE IDE Interface	20
1.5.3.2 Serial ATA Interfaces	20
1.5.4 Real-Time Clock, CMOS SRAM, and Battery	21
1.6 Legacy I/O Controller	21
1.6.1 Diskette Drive Controller	21
1.6.2 Keyboard and Mouse Interface	21
1.7 Audio Subsystem	22
1.7.1 Audio Subsystem Software	22
1.7.2 Audio Connectors	22
1.7.3 Four Channel Audio Subsystem	22
1.8 LAN Subsystem	23
1.8.1 LAN Subsystem Software	23
1.8.2 Realtek RTL8101E-GR Fast Ethernet Controller	24
1.8.2.1 RJ-45 LAN Connector with Integrated LEDs	24
1.9 Hardware Management Subsystem	25
1.9.1 Hardware Monitoring and Fan Control	25
1.9.2 Chassis Intrusion and Detection	25
1.9.3 Fan Monitoring	25
1.9.4 Thermal Monitoring	26
1.10 Power Management	27
1.10.1 ACPI	27
1.10.1.1 System States and Power States	28
1.10.1.2 ENERGY STAR*	28
1.10.1.3 Wake-up Devices and Events	29
1.10.2 Hardware Support	29
1.10.2.1 Power Connector	30
1.10.2.2 Fan Headers	30
1.10.2.3 LAN Wake Capabilities	31
1.10.2.4 Instantly Available PC Technology	31
1.10.2.5 Wake from USB	32
1.10.2.6 Wake from PS/2 Devices	32
1.10.2.7 PME# Signal Wake-up Support	32
1.10.2.8 +5 V Standby Power Indicator LED	32
2 Technical Reference	33
2.1 Memory Resources	34
2.1.1 Addressable Memory	34
2.2 Connectors and Headers	36
2.2.1 Back Panel Connectors	37
2.2.2 Component-side Connectors and Headers	38
2.2.2.1 Power Supply Connectors	41
2.2.2.2 Add-in Card Connectors	42
2.2.2.3 Auxiliary Front Panel Power/Sleep LED Header	42
2.2.2.4 Front Panel Header	43
2.2.2.5 Front Panel USB Headers	45
2.3 Jumper Block	46
2.4 Mechanical Considerations	48
2.4.1 Form Factor	48
2.5 Electrical Considerations	49
2.5.1 Power Supply Considerations	49
2.5.2 Fan Header Current Capability	50
2.5.3 Add-in Board Considerations	50
2.6 Thermal Considerations	50
2.7 Reliability	52
2.8 Environmental	53
3 Overview of BIOS Features	55
3.1 Introduction	55
3.2 BIOS Flash Memory Organization	56
3.3 Resource Configuration	56
3.3.1 PCI Autoconfiguration	56
3.3.2 PCI IDE Support	57
3.4 System Management BIOS (SMBIOS)	57
3.5 BIOS Updates	58
3.5.1 Language Support	58
3.5.2 Custom Splash Screen	58
3.6 Legacy USB Support	59
3.7 Boot Options	59
3.7.1 CD-ROM Boot	59
3.7.2 Network Boot	59
3.7.3 Booting Without Attached Devices	60
3.7.4 Changing the Default Boot Device During POST	60
3.8 Adjusting Boot Speed	61
3.8.1 Peripheral Selection and Configuration	61
3.8.2 BIOS Boot Optimizations	61
3.9 BIOS Security Features	62
4 Error Messages and Beep Codes	63
4.1 BIOS Front-panel Power LED Codes	63
4.2 BIOS Error Messages	63
4.3 Port 80h POST Codes	64
5 Regulatory Compliance and Battery Disposal Information	69
5.1 Regulatory Compliance	69
5.1.1 Safety Standards	69
5.1.2 European Union Declaration of Conformity Statement	70
5.1.3 Product Ecology Statements	71
5.1.3.1 Disposal Considerations	71
5.1.3.2 Recycling Considerations	71
5.1.3.3 Lead Free Desktop Board	74
5.1.4 EMC Regulations	75
5.1.5 Product Certification Markings (Board Level)	76