Intel 925 - Pentium D 925 3.0GHz 800MHz 4MB-Cache Socket 775 CPU User Manual

System Address Map
R
162 Intel
®
82925X/82925XE MCH Datasheet
9.2 Main Memory Address Range (1 MB to TOLUD)
This address range extends from 1 MB to the top of physical memory that is permitted to be
accessible by the MCH (as programmed by BIOS). All accesses to addresses within this range
will be forwarded by the MCH to the main memory unless they fall into the optional TSEG or
optional ISA Hole.
The MCH provides a maximum main memory address decode space of 4 GB. The MCH does not
remap APIC or PCI Express memory space. This means that as the amount of physical memory
populated in the system reaches 4 GB, there will be physical memory that exists, yet non-
addressable; therefore, this memory is unusable by the system.
The MCH does not limit main memory address space in hardware.
Figure 9-3. Main Memory Address Range
Flash
0h
Contains
programmable
windows, ICH6/PCI
ranges.
TOLUD
Main_Mem_Addr
APIC
PCI Memory Range
0010_000h
(Optional)
TSEG (1 MB / 2 MB /
8 MB, optional)
Main Memory
ISA Hole (optional)
Main Memory
DOS Compatibility
Memory
00F0_000h
0100_000h
0 MB
1 MB
15 MB
16 MB
4 GB Maximum
FFFF_FFFFh
9.2.1 ISA Hole (15 MB–16 MB)
BIOS can create a hole at 15 MB–16 MB. Accesses within this hole are forwarded to the DMI.
The range of physical main memory disabled by opening the hole is not remapped to the top of
the memory; that physical main memory space is not accessible. This 15 MB–16 MB hole is an
optionally enabled ISA hole.

Intel 925 - Pentium D 925 3.0GHz 800MHz 4MB-Cache Socket 775 CPU Specifications

General

Brand	Intel
Model	925 - Pentium D 925 3.0GHz 800MHz 4MB-Cache Socket 775 CPU
Category	Computer Hardware
Language	English