參數(shù)資料
型號(hào): 82845Gx
廠商: Intel Corp.
英文描述: Intel 82845G/82845GL/82845GV Graphics and Memory Controller Hub (GMCH)
中文描述: 英特爾82845G/82845GL/82845GV圖形和內(nèi)存控制器中樞(GMCH)
文件頁(yè)數(shù): 141/193頁(yè)
文件大小: 2990K
代理商: 82845GX
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Intel
82845G/82845GL/82845GV GMCH Datasheet
141
System Address
5.1.1
Compatibility Area
This area is divided into the following address regions:
0 – 640 KB DOS Area
640 – 768 KB Video Buffer Area
768 – 896 KB in 16-KB sections (total of 8 sections) - Expansion Area
896 – 960 KB in 16-KB sections (total of 4 sections) - Extended System BIOS Area
960 KB – 1 MB Memory (BIOS Area) - System BIOS Area
There are fifteen memory segments in the compatibility area. Thirteen of the memory ranges can
be enabled or disabled independently for both read and write cycles.
DOS Area (00000h–9FFFFh)
The DOS area is 640 KB in size and is always mapped to the main memory controlled by the
GMCH.
Legacy VGA Ranges (A0000h–BFFFFh)
The legacy 128-KB VGA memory range A0000h–BFFFFh (Frame Buffer) can be mapped to IGD
(Device 2), to AGP/PCI_B (Device 1), and/or to the Hub Interface depending on the programming
of the VGA steering bits. Priority for VGA mapping is constant in that the GMCH always decodes
internally mapped devices first. Internal to the GMCH, decode precedence is given to IGD. The
GMCH always positively decodes internally mapped devices (IGD and AGP/PCI_B). Subsequent
decoding of regions mapped to AGP/PCI_B or the hub interface depends on the Legacy VGA
configurations bits (VGA Enable and MDAP). This region is also the default for SMM space.
Table 5-1. Memory Segments and Their Attributes
Memory Segments
Attributes
Comments
000000h–09FFFFh
fixed - always mapped to main
SDRAM
0 to 640K – DOS Region
0A0000h–0BFFFFh
mapped to Hub Interface, AGP, or
IGD - configurable as SMM space
Video Buffer (physical SDRAM
configurable as SMM space)
0C0000h–0C3FFFh
WE, RE
Add-on BIOS
0C4000h–0C7FFFh
WE, RE
Add-on BIOS
0C8000h–0CBFFFh
WE, RE
Add-on BIOS
0CC000h–0CFFFFh
WE, RE
Add-on BIOS
0D0000h–0D3FFFh
WE, RE
Add-on BIOS
0D4000h–0D7FFFh
WE, RE
Add-on BIOS
0D8000h–0DBFFFh
WE, RE
Add-on BIOS
0DC000h–0DFFFFh
WE, RE
Add-on BIOS
0E0000h–0E3FFFh
WE, RE
BIOS Extension
0E4000h–0E7FFFh
WE, RE
BIOS Extension
0E8000h–0EBFFFh
WE, RE
BIOS Extension
0EC000h–0EFFFFh
WE, RE
BIOS Extension
0F0000h–0FFFFFh
WE, RE
BIOS Area
相關(guān)PDF資料
PDF描述
82845MP Intel 845 Family Chipset-Mobile 82845MP/82845MZ Chipset Memory Controller Hub Mobile (MCH-M)
82845Mx Intel 845 Family Chipset-Mobile 82845MP/82845MZ Chipset Memory Controller Hub Mobile (MCH-M)
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
82845MP 制造商:INTEL 制造商全稱:Intel Corporation 功能描述:Intel 845 Family Chipset-Mobile 82845MP/82845MZ Chipset Memory Controller Hub Mobile (MCH-M)
82845MX 制造商:INTEL 制造商全稱:Intel Corporation 功能描述:Intel 845 Family Chipset-Mobile 82845MP/82845MZ Chipset Memory Controller Hub Mobile (MCH-M)
82845MZ 制造商:INTEL 制造商全稱:Intel Corporation 功能描述:Intel 845 Family Chipset-Mobile 82845MP/82845MZ Chipset Memory Controller Hub Mobile (MCH-M)
82845PE 制造商:INTEL 制造商全稱:Intel Corporation 功能描述:82845GE Graphics and Memory Controller Hub (GMCH) and 82845PE Memory Controller Hub (MCH)
8284611SM 制造商:Thomas & Betts 功能描述: