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參數(shù)資料
| 型號： | 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） |
| 文件頁數(shù)： | 142/193頁 |
| 文件大小： | 2990K |
| 代理商： | 82845GX |
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System Address
142
Intel
82845G/82845GL/82845GV GMCH Datasheet
Compatible SMRAM Address Range (A0000h–BFFFFh)
When compatible SMM space is enabled, SMM-mode processor accesses to this range are routed
to physical system SDRAM at this address. Non-SMM-mode processor accesses to this range are
considered to be to the Video Buffer Area as described above. AGP and hub interface originated
cycles to enabled SMM space are not allowed and are considered to be to the Video Buffer Area.
Monochrome Adapter (MDA) Range (B0000h–B7FFFh)
Legacy support requires the ability to have a second graphics controller (monochrome) in the
system. Accesses in the standard VGA range are forwarded to IGD, AGP/PCI_B, and the hub
interface (depending on configuration bits). Since the monochrome adapter may be mapped to any
one of these devices, the GMCH must decode cycles in the MDA range and forward them either to
IGD, AGP/PCI_B, or the hub interface. This capability is controlled by a VGA steering bits and the
legacy configuration bit (MDAP bit). In addition to the memory range B0000h to B7FFFh, the
GMCH decodes I/O cycles at 3B4h, 3B5h, 3B8h, 3B9h, 3BAh and 3BFh and forwards them to the
either the IGD, AGP/PCI_B, and/or the hub interface.
Expansion Area (C0000h–DFFFFh)
This 128-KB ISA Expansion region is divided into eight, 16-KB segments. Each segment can be
assigned one of four read/write states: read-only, write-only, read/write, or disabled. Typically,
these blocks are mapped through GMCH and are subtractively decoded to ISA space. Memory that
is disabled is not remapped.
Extended System BIOS Area (E0000h–EFFFFh)
This 64-KB area is divided into four, 16-KB segments. Each segment can be assigned independent
read and write attributes so it can be mapped either to main SDRAM or to the hub interface.
Typically, this area is used for RAM or ROM. Memory segments that are disabled are not
remapped elsewhere.
System BIOS Area (F0000h–FFFFFh)
This area is a single, 64-KB segment. This segment can be assigned read and write attributes. It is
by default (after reset) read/write disabled and cycles are forwarded to the hub interface. By
manipulating the read/write attributes, the GMCH can “shadow” BIOS into the main SDRAM.
When disabled, this segment is not remapped.
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) |
| 82845MZ | Intel 845 Family Chipset-Mobile 82845MP/82845MZ Chipset Memory Controller Hub Mobile (MCH-M) |
| 82845PE | 82845GE Graphics and Memory Controller Hub (GMCH) and 82845PE Memory Controller Hub (MCH) |
| 82845GE | 82845GE Graphics and Memory Controller Hub (GMCH) and 82845PE Memory Controller Hub (MCH) |
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: |
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