AC82G41SLGQ3 Datasheet, PDF (61/604 Pages) Intel Corporation – Intel® 4 Series Chipset Family

System Address Map
Figure 6. Main Memory Address Range
FFFF_FFFFh
Main Memory
.
.
.
.
.
FLASH
APIC
LT
PCI Memory Range
TSEG (1MB/2MB/8MB,
optional)
8 GB
4 GB
0100_0000h
00F0_0000h
Main Memory
ISA Hole (optional)
Main Memory
0010_0000h
0h
DOS Compatibility Memory
3.2.1
ISA Hole (15 MB –16 MB)
A hole can be created at 15 MB–16 MB as controlled by the fixed hole enable in Device
0 space. Accesses within this hole are forwarded to the DMI Interface. The range of
physical DRAM memory disabled by opening the hole is not remapped to the top of the
memory – that physical DRAM space is not accessible. This 15 MB–16 MB hole is an
optionally enabled ISA hole.
Video accelerators originally used this hole. It is also used by validation and customer
SV teams for some of their test cards. That is why it is being supported. There is no
inherent BIOS request for the 15 MB–16 MB window.
Datasheet
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