Intel 815 Manuel D’Utilisation
Intel® 815 Chipset: Graphics Controller PRM, Rev 1.0
R
29
3.
System Address Map
This chapter provides address maps of the graphics controller (GC) I/O and memory-mapped registers.
Individual register bit field descriptions are provided in the following chapters. Note that PCI
configuration register descriptions are not covered in this document. For details on PCI configuration
registers, refer to the Intel® 815 Chipset: 82815 Graphics and Memory Controller (GMCH) EDS.
Individual register bit field descriptions are provided in the following chapters. Note that PCI
configuration register descriptions are not covered in this document. For details on PCI configuration
registers, refer to the Intel® 815 Chipset: 82815 Graphics and Memory Controller (GMCH) EDS.
Figure 5 shows a high-level representation of the system memory address map. Figure 6 provides
additional details on mapping specific memory regions as defined and supported by the GMCH chipset.
additional details on mapping specific memory regions as defined and supported by the GMCH chipset.
Figure 5.
System Memory Address Map
Top of the Main Memory
PCI
Memory
Address
Address
Range
4 GB
0
Independently
Programmable Non-
Overlapping Memory
Windows
mem_map_s
Local
Memory
Range
Memory
Mapped
Mapped
Range
Main
Memory
Address
Address
Range
Figure 6.
Detailed Memory System Address Map
mem_map2.vsd
DOS Area
(640 KB)
000000h
0A0000h
09FFFFh
0C0000h
0BFFFFh
0E0000h
0DFFFFh
0FFFFFh
1 MB
896 KB
768 KB
640 KB
0 KB
0F0000h
0EFFFFh
960 KB
DOS
Compatibility
Memory
0 MB
Optionally
mapped to the
internal AGP
Std PCI/ISA
Video Mem
(SMM Mem)
128 KB
Expansion Card
BIOS
and Buffer Area
(128 KB;
16 KB x 8)
Lower BIOS Area
(64 KB; 16 KB x 4)
Upper BIOS Area
(64 KB)
System Memory
Space
64 GB
1 MB
16 MB
640 KB
15 MB
512 MB
4 GB Max TOM
Optional ISA Hole
Main Memory
Range
PCI
Memory
Range
Extended
P6
Memory
AGP
Window
Graphics
Aperture