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Chapter 3 Processor/Memory Subsystem
Compaq Deskpro EN Series of Personal Computers
Desktop and Minitower Form Factors
Third Edition - September 1998
3-8
Figure 3-3 shows the system memory map for the system.
NOTE:
All locations in memory are cacheable. Base memory is always mapped to DRAM. The next 128 KB fixed
memory area can, through the north bridge, be mapped to DRAM or to PCI space. Graphics RAM area is mapped
to PCI or AGP locations.
Figure 3–4. System Memory Map
High BIOS Area
(
2 MB
)
Host/PCI Memory
Expansion
(1008 MB)
FFFF FFFFh
1 MB
Graphics/SMRAM
RAM (128 KB)
System BIOS Area
(64 KB)
Fixed Mem. Area
(128 KB)
Base Memory
(512 KB)
Extended BIOS Area
(64 KB)
Extended Memory
(
15 MB
)
FFE0 0000h
0100 0000h
00FF FFFFh
0010 0000h
000F 0000h
000E FFFFh
000F FFFFh
0000 0000h
0007 FFFFh
0008 0000h
0009 FFFFh
000B FFFFh
000A 0000h
512 KB
640 KB
16 MB
4 GB
Host, PCI,
ISA Area
DOS Compatibility
Area
Option ROM
(128 KB)
000E 0000h
000D FFFFh
000C 0000h
1 GB
Host,
PCI, AGP Area
PCI Memory
(18 MB)
FFDF FFFFh
FEC1 0000h
FEC0 FFFFh
APIC Config. Space
(64 KB)
FEBF FFFFh
FEC0 0000h
PCI Memory
Expansion
(2548 MB)
3FFF FFFFh
4000 0000h