Technical Reference; Introduction; Memory Resources; Addressable Memory - Intel BLKD915PBLL - LGA775 800FSB 4DDR2 Audio Lan 1394a SATA Raid ATX 4PCI 10Pack Motherboard Technical Product Specification

2 Technical Reference

What This Chapter Contains
2.1

Introduction ................................................................................................................ 49

2.2

Memory Resources.................................................................................................... 49

2.3 DMA Channels........................................................................................................... 51
2.4 Fixed I/O Map ............................................................................................................ 52
2.5 PCI Configuration Space Map.................................................................................... 53
2.6 Interrupts.................................................................................................................... 54
2.7 PCI Conventional Interrupt Routing Map.................................................................... 55
2.8 Connectors ................................................................................................................ 57
2.9 Jumper Block ............................................................................................................. 69
2.10 Mechanical Considerations ........................................................................................ 70
2.11 Electrical Considerations............................................................................................ 72
2.12 Thermal Considerations ............................................................................................. 74
2.13 Reliability ................................................................................................................... 76
2.14 Environmental ............................................................................................................ 77
2.15 Regulatory Compliance.............................................................................................. 78
2.1 Introduction
Sections 2.2 - 2.6 contain several standalone tables. Table 9 describes the system memory map,
Table 10 lists the DMA channels, Table 11 shows the I/O map, Table 12 defines the PCI
Conventional bus configuration space map, and Table 13 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
(firmware hub), 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/firmware hub (2 MB)
•
Local APIC (19 MB)
•
Digital Media Interface (40 MB)
•
Front side bus interrupts (17 MB)
•
PCI Express configuration space (256 MB)
•
MCH base address registers, internal graphics ranges, PCI Express ports (up to 512 MB)
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