Intel DG41AN Product Specification - Page 37

Technical Reference

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2 Technical Reference 2.1 Memory Map 2.1.1 Addressable Memory The board utilizes 4 GB of addressable system memory. Typically the address space that is allocated for Conventional PCI bus add-in cards, 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 (8 Mbits) • 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 Conventional PCI add-in cards • Base graphics memory support (1 MB or 8 MB) NOTE System resources and hardware (such as PCI) require physical memory address locations that can reduce available addressable system memory. This could result in a reduction of as much as 1 GB or more of physical addressable memory being available to the operating system and applications, depending on the system configuration and operating system. 37

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37
2
Technical Reference
2.1
Memory Map
2.1.1
Addressable Memory
The board utilizes 4 GB of addressable system memory.
Typically the address space
that is allocated for Conventional PCI bus add-in cards, 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 (8 Mbits)
•
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 Conventional PCI add-in
cards
•
Base graphics memory support (1 MB or 8 MB)
±
NOTE
System resources and hardware (such as PCI) require physical memory address
locations that can reduce available addressable system memory. This could result in a
reduction of as much as 1 GB or more of physical addressable memory being available
to the operating system and applications, depending on the system configuration and
operating system.