Detailed System Memory Address Map - Intel BLKD915PGNL - LGA775 800FSB 4DDR Audio Lan SATA ATX 4PCI Technical Product Specification

Intel Desktop Board D915PGN/D915PSY Technical Product Specification
The amount of installed memory that can be used will vary based on add-in cards and BIOS
settings. Figure 16 shows a schematic of the system memory map. All installed system memory
can be used when there is no overlap of system addresses.
PCI Memory Range -
contains PCI, chipsets,
Direct Media Interface
(DMI), and ICH ranges
(approximately 750 MB)
DRAM
Range
Compatibility
Memory
56
4 GB
Top of System Address Space
FLASH
APIC
Reserved
DOS
Figure 16. Detailed System Memory Address Map
~20 MB
0FFFFFH
0F0000H
0EFFFFH
Top of usable
DRAM (memory
visible to the
0E0000H
operating
0DFFFFH
system)
0C0000H
0BFFFFH
1 MB
640 KB
0A0000H
09FFFFH
00000H
0 MB
1 MB
Upper BIOS
area (64 KB)
960 KB
Lower BIOS
area
(64 KB;
16 KB x 4)
896 KB
Add-in Card
BIOS and
Buffer area
(128 KB;
16 KB x 8)
768 KB
Standard PCI/
ISA Video
Memory (SMM
Memory)
128 KB
640 KB
DOS area
(640 KB)
0 KB
OM17140