Configuration And Initialization; Memory Space; Figure 14. Intel ® Xeon™ Processor Memory Address Space - Intel SE7520JR2 Technical Manual

Functional Architecture
3.5

Configuration and Initialization

This section describes the initial programming environment including address maps for memory
and I/O, techniques and considerations for programming ASIC registers, and hardware options
configuration.
3.5.1

Memory Space

At the highest level, the Intel Xeon processor address space is divided into four regions, as
shown in the following figure. Each region contains the sub-regions that are described in
following sections. Attributes can be independently assigned to regions and sub-regions using
registers. The Intel E7520 chipset supports 64GB of host-addressable memory space and
64KB+3 of host-addressable I/O space. The Server Board SE7520JR2 supports only the main
memory up to 24GB for DDR-266 or up to 16GB for DDR333/DDR2-400.
Upper Memory
Ranges
Lo PCI Memory
Space Range
Main Memory
Address Range
DOS Legacy
Address Range
Figure 14. Intel
70
64GB
Hi PCI Memory
Address Range
Additional Main
Memory Address
Range
4GB
Top of Low Memory (TOLM)
TSEG SMRAM Space
16MB
Optional ISA Hole
15MB
1MB
640KB
512KB
0
®
Xeon™ Processor Memory Address Space
C78844-002
Intel® Server Board SE7520JR2
Revision 1.0