Intel D925XCV Detailed System Memory Address Map, area 64 KB, Add-in Card, Buffer area, 896 KB

Intel Desktop Board D925XCV/D925XBC Technical Product Specification

•Memory-mapped I/O that is dynamically allocated for PCI Conventional and PCI Express add- in cards

The amount of installed memory that can be used will vary based on add-in cards and BIOS settings. Figure 18 shows a schematic of the system memory map. All installed system memory can be used when there is no overlap of system addresses.

4 GB

Top of System Address Space

FLASH

APIC ~20 MB

Reserved

PCI Memory Range - contains PCI, chipsets, Direct Media Interface (DMI), and ICH ranges (approximately 750 MB)

Top of usable DRAM (memory visible to the operating system)

0FFFFFH	Upper BIOS
0F0000H	area (64 KB)
0EFFFFH	Lower BIOS
	area
	(64 KB;
0E0000H	16 KB x 4)
0DFFFFH	Add-in Card
	BIOS and
	Buffer area
	(128 KB;
	16 KB x 8)

1MB

960 KB

896 KB

DRAM

Range

DOS

Compatibility

Memory

1 MB

640 KB

0C0000H
0BFFFFH	Standard PCI/
	ISA Video
	Memory (SMM
	Memory)
0A0000H	128 KB
09FFFFH
	DOS area
00000H	(640 KB)

768 KB

640 KB

0 MB

0 KB

OM17140

Figure 18. Detailed System Memory Address Map

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