参数资料
型号: RG82845MZ
英文描述: Controller Miscellaneous - Datasheet Reference
中文描述: 控制器杂项-数据表参考
文件页数: 8/157页
文件大小: 1407K
代理商: RG82845MZ
Intel
82845MP/82845MZ Chipset-Mobile (MCH-M)
250687-002
Datasheet
105
R
4.
System Address Map
A system based on the Intel 845MP/845MZ Chipset supports 4 GB of addressable memory space and 64
KB+3 of addressable I/O space. The I/O and memory spaces are divided by system configuration
software into 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.
4.1.
Memory Address Ranges
The system memory map is broken into two categories:
Extended Memory Range (1MB to 4GB) - Extended memory, existing between 1 MB and 4 GB. It
contains a 32-bit memory space, which is used for mapping PCI, AGP, APIC, SMRAM, and BIOS
memory spaces.
DOS Compatible Area (below 1 MB) - A DOS legacy space, which is used for BIOS and legacy
devices on the LPC interface.
Figure 5. Addressable Memory Space
DOS legacy Address
Range
PCI Memory Address
Range
4 GB
Independently
Programmable
Non-overlapping
Windows
Main Memory Address
Range
Hublink_A
AGP
Graphics
Aperture
1 MB
Top of Low Memory
IO
Aperture
APICs
These address ranges are always mapped to system memory, regardless of the system configuration.
Memory may be carved out of the MAINMEM segment for use by System Management Mode (SMM)
hardware and software. The Top of Low Memory (TOM) register defines the top of Main Memory.
Note: The address of the highest 16-MB quantity of valid memory in the system is placed into the GBA15
register.
For memory populations less than 3 GB, this value will be the same as the one programmed into the
TOM register. For other memory configurations, the two are unlikely to be the same, since the PCI
configuration portion of the BIOS software will program the TOM register to the maximum value that is
less than the amount of memory in the system and that allows enough room for all populated PCI
devices.
相关PDF资料
PDF描述
RG82870P2 Controller Miscellaneous - Datasheet Reference
RH5RE36AA-T1-FA 3.6 V FIXED POSITIVE LDO REGULATOR, 0.7 V DROPOUT, PSSO3
RH5RE56AA-T1-FA 5.6 V FIXED POSITIVE LDO REGULATOR, 0.7 V DROPOUT, PSSO3
RE5RE36AA-TZ-FC 3.6 V FIXED POSITIVE LDO REGULATOR, 0.7 V DROPOUT, PBCY3
RE5RE36AC-TZ-FC 3.6 V FIXED POSITIVE LDO REGULATOR, 0.7 V DROPOUT, PBCY3
相关代理商/技术参数
参数描述
RG82845PE S L6H5 制造商:Intel 功能描述:CHIPSTGMCH 82845PE HT-PBGA760
RG82845PESL6Q3 制造商:Intel 功能描述:Chipsets
RG82845-SL5V7 制造商:Intel 功能描述:INTEL 845G GRAPHICS AND MEMORY CONTROLLER HUB(GMCH)
RG82845SL5YQ 制造商:INTEL 制造商全称:Intel Corporation 功能描述:Intel?? 845 Chipset: 82845 Memory Controller Hub (MCH) for SDR
RG82845-SL63W 制造商:Intel 功能描述:INTEL 845G GRAPHICS AND MEMORY CONTROLLER HUB(GMCH)