Detailed System Memory Address Map - Intel D865PERLX Specification

Intel Desktop Board D865PERC/D865PESO Technical Product Specification
installed system memory can be used when there is no overlap of system addresses. For example,
all of the system address space can be utilized on a system that has 2 GB of installed system
memory, AGP aperture set for 256 MB, and the PCI cards are requesting 200 MB of system
address space.
PCI Memory Range
(contains AGP window,
AGP aperture, PCI, and
ICH ranges)
DRAM
Range
Compatibility
Memory
50
4 GB
Top of System Address Space
FLASH
APIC
Reserved
DOS
Figure 17. 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
* Optionally mapped
to the internal AGP
OM16106