EP80579 Datasheet, PDF (267/1916 Pages) Intel Corporation – Intel® EP80579 Integrated Processor Product Line

Intel^® EP80579 Integrated Processor
10.0 System Address Map
10.1
Overview
The IA-32 core addressable memory map is 32 bits or up to 4 GBytes and has
64 KBytes+3 of addressable I/O space. The I/O and memory spaces are divided by
system configuration software into non-overlapping regions. The memory ranges are
useful either as system memory or as specialized memory, while the I/O regions are
used solely to control the operation of devices in the system.
There are five basic regions of memory in the system. The regions are shown in
Table 10-1. Figure 10-1 illustrates the basic memory regions.
Table 10-1. Regions of Memory Ranges
Range
Between top of main memory and 64 GBytes
Between 4 GBytes and top of main memory
Between TOLM Register and 4 GBytes
Between 1 MByte and the TOLM Register
Below 1 MByte
Description
High PCI Memory Range
Low PCI Memory Address Range
Main Memory Address Range
DOS Legacy Address Range
Figure 10-1. Basic Memory Regions
64 GB
Additional Main
Memory Address
Range
Lo PCI Memory
Address Range
Main Memory
Address Range
DOS Legacy
Address Range
4 GB
Top of Low Memory
1 MB
APIC, PCI Express, and
NSI, non overlapping
windows
August 2009
Order Number: 320066-003US
Intel^® EP80579 Integrated Processor Product Line Datasheet
267