Mchbar-Mch Memory Mapped Register Range Base Address (D0:F0) - Intel 925 - Pentium D 925 3.0GHz 800MHz 4MB-Cache Socket 775 CPU Datasheet

R
4.1.13 MCHBAR—MCH Memory Mapped Register Range Base
Address (D0:F0)
PCI Device:
Address Offset:
Default Value:
Access:
Size:
This is the base address for the MCH memory-mapped configuration space. There is no physical
memory within this 16-KB window that can be addressed. The 16 KB reserved by this register
does not alias to any PCI 2.3 compliant memory mapped space.
On reset, this register is disabled and must be enabled by writing a 1 to MCHBAREN [Dev 0,
offset 54h, bit 28]
Bit
31:14
13:0
®
Intel 82925X/82925XE MCH Datasheet
Access &
Default
R/W MCH Memory Mapped Base Address: This field corresponds to bits 31 to 14 of
00000h the base address MCH memory-mapped configuration space.
BIOS will program this register resulting in a base address for a 16-KB block of
contiguous memory address space. This register ensures that a naturally aligned
16-KB space is allocated within total addressable memory space of 4 GB.
System software uses this base address to program the MCH Memory-mapped
register set.
Reserved
Host Bridge/DRAM Controller Registers (D0:F0)
0
44h
00000000h
R/W
32 bits
Description
55