Technical Reference; Memory Map; Addressable Memory; What This Chapter Contains 2.1 Memory Map - Intel BLKD945GCLF - MB 533FSB DDR2 667 533 Aud+Vdo+Lan mATX Technical Product Specification

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Technical Reference

What This Chapter Contains
2.1 Memory Map................................................................................... 37
2.2 Connectors and Headers................................................................... 40
2.3 Jumper Block .................................................................................. 49
2.4 Mechanical Considerations ................................................................ 50
2.5 Electrical Considerations ................................................................... 51
2.6 Thermal Considerations .................................................................... 52
2.7 Reliability ....................................................................................... 54
2.8 Environmental ................................................................................ 54
2.1

Memory Map

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, PCI Express configuration
space, 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)
• Direct Media Interface (40 MB)
• Front side bus interrupts (17 MB)
• GMCH base address registers, internal graphics ranges
• Memory-mapped I/O that is dynamically allocated for PCI Conventional add-in
cards
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