RG82845SL5YQ Datasheet, PDF (98/148 Pages) Intel Corporation – Intel® 845 Chipset: 82845 Memory Controller Hub (MCH) for SDR

System Address Map
R
Figure 4. DOS Compatible Area Address Map
Standard PCI/ISA
Video Mem ory
(SMM Memory)
0C0000h
0B8000h
0B0000h
0A0000h
Upper, Lower,
Expansion Card BIOS
and Buffer Area
Monochrome Display
Adapter Space
1 MB
768 KB
736 KB
704 KB
640 KB
Controlled by
PAM[6:0]
Controlled by
VGA Enable and
MDA Enable
= Optional AGP
= Optional System Mem ory
= System Mem ory
Figure 5. Extended Memory Range Address Map
High BIOS, Optional
extended SMRAM
Hub Interface
(always)
Local APIC Space
Hub Interface
(always)
I/O APIC Space
I/O APIC Space
AGP/PCI
Extended SMRAM
Space
1_0000_0000 (4 GB)
FF00_0000
FEF0_0000
FEE0_0000
FED0_0000
FEC8_0000
FEC0_0000
Top of Low Memory (TOM)
TEM - TSEG
Extended SMRAM
(translated to < 1 MB)
100C_0000
100A_0000
ISA Hole
0100_0000 (16 MB)
00F0_0000 (15 MB)
0010_0000 (1 MB)
sys_addr_map_2
= System Mem ory Region
= Optional System Mem ory Region
sys_addr_map_3
98
Intel^® 82845 MCH for SDR Datasheet