82845PE Datasheet, PDF (102/176 Pages) Intel Corporation – 82845GE Graphics and Memory Controller Hub (GMCH) and 82845PE Memory Controller Hub (MCH)

System Address
Figure 4-1. Memory System Address Map
4 GB
PCI Memory
Address Range
Graphics
Memory
AGP
Graphics
Aperture
Main Memory
Address Range
Top of Main
Memory
Independently Programmable
Non-overlapping Windows
Figure 4-2. Detailed Memory System Address Map
Extended
Memory
System Memory
Space
64 GB
4 GB Max TOM
PCI
Memory
Range
Main Memory
Range
DOS
Compatibility
Memory
AGP
Graphics
Window Aperture
2 GB
Optional ISA Hole
16 MB
15 MB
0FFFFFh
0F0000h
0EFFFFh
0E0000h
0DFFFFh
Upper BIOS Area
(64 KB)
Lower BIOS Area
(64 KB; 16 KB x 4)
1 MB
960 KB
896 KB
Expansion Card
BIOS
and Buffer Area
(128 KB;
16 KB x 8)
1 MB
640 KB
0 MB
0C0000h
0BFFFFh
Optionally
mapped to the
AGP
0A0000h
09FFFFh
000000h
Std PCI/ISA
Video Mem
(SMM Mem)
128 KB
DOS Area
(640 KB)
768 KB
640 KB
0 KB
102
Intel^® 82845GE/82845PE Datasheet