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Intel D945GCNL Product Specification - Page 54

Jumper Block - bios recovery

UPC - 735858194570

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Intel Desktop Board D945GCNL Technical Product Specification 2.8 Jumper Block CAUTION Do not move the jumper with the power on. Always turn off the power and unplug the power cord from the computer before changing a jumper setting. Otherwise, the board could be damaged. Figure 12 shows the location of the jumper block. The jumper block determines the BIOS Setup program's mode. Table 26 describes the jumper settings for the three modes: normal, configure, and recovery. When the jumper is set to configure mode and the computer is powered-up, the BIOS compares the processor version and the microcode version in the BIOS and reports if the two match. Figure 12. Location of the Jumper Block 54

Section	Page
Intel® Desktop Board D945GCNL 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	18
1.5.1 Intel 945GC Graphics Subsystem	18
1.5.2 USB	20
1.5.3 IDE Support	21
1.5.4 Real-Time Clock, CMOS SRAM, and Battery	22
1.6 PCI Express* Connectors	22
1.7 Legacy I/O Controller	23
1.7.1 Serial Port	23
1.7.2 Parallel Port	23
1.7.3 Diskette Drive Controller	23
1.7.4 Keyboard and Mouse Interface	23
1.8 Audio Subsystem	24
1.8.1 Audio Subsystem Software	24
1.8.2 Audio Connectors	24
1.8.3 6 Channel (5.1) Audio Subsystem	25
1.9 LAN Subsystem	26
1.9.1 LAN Subsystem Software	26
1.9.2 Realtek RTL8111B-GR Physical Layer Interface Device	26
1.10 Hardware Management Subsystem	28
1.10.1 Hardware Monitoring and Fan Control ASIC	28
1.10.2 Chassis Intrusion and Detection	28
1.10.3 Fan Monitoring	28
1.10.4 Thermal Monitoring	29
1.11 Power Management	30
1.11.1 ACPI	30
1.11.2 Hardware Support	32
2 Technical Reference	37
2.1 Memory Resources	37
2.1.1 Addressable Memory	37
2.1.2 Memory Map	39
2.2 DMA Channels	39
2.3 Fixed I/O Map	40
2.4 PCI Configuration Space Map	41
2.5 Interrupts	42
2.6 PCI Conventional Interrupt Routing Map	43
2.7 Connectors and Headers	44
2.7.1 Back Panel Connectors	45
2.7.2 Component-side Connectors and Headers	46
2.8 Jumper Block	54
2.9 Mechanical Considerations	56
2.9.1 Form Factor	56
2.10 Electrical Considerations	57
2.10.1 Power Supply Considerations	57
2.10.2 Fan Header Current Capability	58
2.10.3 Add-in Board Considerations	58
2.11 Thermal Considerations	59
2.12 Reliability	61
2.13 Environmental	61
3 Overview of BIOS Features	63
3.1 Introduction	63
3.2 BIOS Flash Memory Organization	64
3.3 Resource Configuration	64
3.3.1 PCI Autoconfiguration	64
3.3.2 PCI IDE Support	65
3.4 System Management BIOS (SMBIOS)	65
3.5 BIOS Updates	66
3.5.1 Language Support	66
3.5.2 Custom Splash Screen	66
3.6 Legacy USB Support	67
3.7 Boot Options	67
3.7.1 CD-ROM Boot	67
3.7.2 Network Boot	67
3.7.3 Booting Without Attached Devices	68
3.7.4 Changing the Default Boot Device During POST	68
3.8 Adjusting Boot Speed	69
3.8.1 Peripheral Selection and Configuration	69
3.8.2 BIOS Boot Optimizations	69
3.9 BIOS Security Features	70
4 Error Messages and Beep Codes	71
4.1 Speaker	71
4.2 BIOS Beep Codes	71
4.3 BIOS Error Messages	71
4.4 Port 80h POST Codes	72
5 Regulatory Compliance and Battery Disposal Information	77
5.1 Regulatory Compliance	77
5.1.1 Safety Standards	77
5.1.2 European Union Declaration of Conformity Statement	78
5.1.3 Product Ecology Statements	79
5.1.4 EMC Regulations	83
5.1.5 Product Certification Markings (Board Level)	85