Technical Reference; Introduction; Memory Resources; Addressable Memory - Intel BLKD945GNTL - LGA775 1066 800FSB 4DDR2 A/V Lan SATA ATX 10Pack Motherboard Technical Product Specification

2 Technical Reference

What This Chapter Contains
2.1 Introduction .................................................................................................................. 47
2.2 Memory Resources ...................................................................................................... 47
2.3 DMA Channels ............................................................................................................. 49
2.4 Fixed I/O Map............................................................................................................... 50
2.5 PCI Configuration Space Map...................................................................................... 51
2.6 Interrupts ...................................................................................................................... 52
2.7 PCI Conventional Interrupt Routing Map ..................................................................... 53
2.8 Connectors................................................................................................................... 55
2.9 Jumper Block ............................................................................................................... 67
2.10 Mechanical Considerations .......................................................................................... 68
2.11 Electrical Considerations.............................................................................................. 71
2.12 Thermal Considerations ............................................................................................... 73
2.13 Reliability...................................................................................................................... 75
2.14 Environmental .............................................................................................................. 76
2.15 Regulatory Compliance................................................................................................ 77

2.1 Introduction

Sections 2.2 - 2.6 contain several standalone tables. Table 10 describes the system memory map,
Table 11 lists the DMA channels, Table 12 shows the I/O map, Table 13 defines the PCI
Conventional bus configuration space map, and Table 14 describes the interrupts. The remaining
sections in this chapter are introduced by text found with their respective section headings.

2.2 Memory Resources

2.2.1 Addressable Memory

The board utilizes 4 GB of addressable system memory. Typically the address space that is
allocated for PCI Conventional bus add-in cards, PCI Express configuration space, BIOS (SPI
Flash), and chipset overhead resides above the top of DRAM (total system memory). On a system
that has 4 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 (2 MB)
•
Local APIC (19 MB)
•
Digital Media Interface (40 MB)
•
Front side bus interrupts (17 MB)
•
PCI Express configuration space (256 MB)
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