DG33BU Datasheet, PDF (38/84 Pages) Intel Corporation – Technical Product Specification

Intel Desktop Board DG33BU Technical Product Specification
The amount of installed memory that can be used will vary based on add-in cards and
BIOS settings. Figure 8 shows a schematic of the system memory map. All installed
system memory can be used when there is no overlap of system addresses.
8 GB
Top of System Address Space
FLASH
APIC
Reserved
Upper
4 GB of
address
space
~20 MB
PCI Memory Range -
contains PCI, chipsets,
Direct Media Interface
(DMI), and ICH ranges
(approximately 750 MB)
DRAM
Range
DOS
Compatibility
Memory
Top of usable
DRAM (memory
visible to the
operating system)
1 MB
640 KB
0 MB
0FFFFFH
0F0000H
0EFFFFH
0E0000H
0DFFFFH
0C0000H
0BFFFFH
0A0000H
09FFFFH
00000H
Upper BIOS
area (64 KB)
Lower BIOS
area
(64 KB;
16 KB x 4)
Add-in Card
BIOS and
Buffer area
(128 KB;
16 KB x 8)
Standard PCI/
ISA Video
Memory (SMM
Memory)
128 KB
DOS area
(640 KB)
1 MB
960 KB
896 KB
768 KB
640 KB
0 KB
OM18311
Figure 8. Detailed System Memory Address Map
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