Processor/Memory Subsystem

 

 

 

 

 

 

 

 

1 FFFF FFFEh

High BIOS Area

 

 

 

 

 

 

 

 

 

 

 

FFE0 0000h

DMI/APIC

 

 

 

 

 

 

 

 

 

 

Area

 

 

 

 

 

 

 

 

 

 

F000 0000h

 

 

 

 

 

 

PCI

 

 

 

 

 

Memory

 

 

 

 

 

Area

 

 

 

 

 

 

 

 

 

 

 

 

 

Main

IGC (1-64 MB)

 

TSEG

 

Memory

 

Area

Main

 

 

 

 

 

 

 

 

 

0100 0000h

Memory

 

 

 

 

 

 

 

 

 

 

 

 

 

00FF FFFFh

 

 

 

 

 

 

Main

 

 

 

 

 

Memory

 

 

 

 

0010 0000h

 

 

 

 

 

 

 

 

 

 

000F FFFFh

BIOS

 

 

 

 

 

 

 

 

 

Extended BIOS

 

 

 

 

 

 

 

DOS

Expansion Area

 

Compatibilty

Legacy Video

 

Area

 

 

Base Memory

 

 

 

 

0000 0000h

 

 

 

 

 

 

 

 

 

 

 

 

 

 

8 GB

Top of DRAM

16 MB

1MB

640 KB

Figure 3-2. System Memory Map (for maximum of 8 gigabytes)

All locations in memory are cacheable. Base memory is always mapped to DRAM. The next 128 KB fixed memory area can be mapped to DRAM or to PCI space. Graphics RAM area is mapped to PCI locations.

3-6

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Technical Reference Guide