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Technical Reference Guide
Figure 3-3 shows the system memory map.
4 GB
1FFF FFFFh
2000 0000h
PCI Memory
Expansion
(3060 MB)
FEBF FFFFh
FEC0 0000h
APIC Config. Space
(64 KB)
FEC1 0000h
FEC0 FFFFh
PCI Memory
(18 MB)
Host,
PCI, AGP Area
000E 0000h
000D FFFFh
Option ROM
(128 KB)
DOS Compatibility
Area
Host, PCI,
ISA Area
000B FFFFh
000C 0000h
0009 FFFFh
000A 0000h
0007 FFFFh
0008 0000h
0000 0000h
0010 0000h
000F FFFFh
0100 0000h
00FF FFFFh
Extended Memory
(15 MB)
Base Memory
(512 KB)
Fixed Mem. Area
(128 KB)
System BIOS Area
(128 KB max [2] )
Graphics/SMRAM
RAM (128 KB)
FFFF FFFFh
FFE0 0000h
FFDF FFFFh
Host/PCI Memory
Expansion
(496 MB)
High BIOS Area
(2 MB)
[1]
16 MB
1 MB
640 KB
512 KB
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.
[1] D315 model, 1 GB; d325, 2 GB
[2] Area typically less according to need and Setup configuration. Default area is E6100-FFFFFh.
Figure 3–3. System Memory Map
Compaq D315 and hp d325 Personal Computers
Featuring the AMD Athlon XP Processor
Second Edition - April 2003
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