參數(shù)資料
型號(hào): 845GE
廠商: Intel Corp.
英文描述: 82845GE Graphics and Memory Controller Hub (GMCH) and 82845PE Memory Controller Hub (MCH)
中文描述: 82845GE圖形和內(nèi)存控制器中樞(GMCH)和82845PE內(nèi)存控制器中樞(MCH)
文件頁(yè)數(shù): 41/176頁(yè)
文件大?。?/td> 2661K
代理商: 845GE
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Intel
82845GE/82845PE Datasheet
41
Register Description
Logically, the ICH4 appears as multiple PCI devices within a single physical component also
residing on PCI bus #0. One of the ICH4 devices is a PCI-to-PCI bridge. Logically, the primary
side of the bridge resides on PCI #0 while the secondary side is the standard PCI expansion bus.
Note:
A physical PCI bus #0 does not exist and that the hub interface and the internal devices in the
(G)MCH and ICH4 logically constitute PCI Bus #0 to configuration software.
3.3
Routing Configuration Accesses
The (G)MCH supports two bus interfaces: Hub interface and AGP/PCI. PCI configuration cycles
are selectively routed to one of these interfaces. The (G)MCH is responsible for routing PCI
configuration cycles to the proper interface. PCI configuration cycles to ICH4 internal devices and
Primary PCI (including downstream devices) are routed to the ICH4 via the hub interface. AGP/
PCI_B configuration cycles are routed to AGP. The AGP/PCI_B interface is treated as a separate
PCI bus from the configuration point of view. Routing of configuration accesses to AGP/PCI_B is
controlled via the standard PCI-to-PCI bridge mechanism using information contained within the
Primary Bus Number, the Secondary Bus Number, and the Subordinate Bus Number registers of
the corresponding PCI-to-PCI bridge device.
A detailed description of the mechanism for translating processor I/O bus cycles to configuration
cycles on one of the two buses is described in the following sections.
Figure 3-1. Conceptual Intel
845GE/845PE Chipset Platform PCI Configuration Diagram
Processor
PCI Configuration Window
in I/O Space
Intel
ICH4
Hub
Interface
Integrated
Graphics Device;
Bus #0,
Device 2
(82845GE only)
Host-to-AGP
Bridge; Bus #0,
Device 1
DRAM Control/Hub
Interface Device;
Bus #0,
Device 0
GMCH/MCH
相關(guān)PDF資料
PDF描述
845PE 82845GE Graphics and Memory Controller Hub (GMCH) and 82845PE Memory Controller Hub (MCH)
845G Intel 82845G/82845GL/82845GV Graphics and Memory Controller Hub (GMCH)
845GL Intel 82845G/82845GL/82845GV Graphics and Memory Controller Hub (GMCH)
845GV Intel 82845G/82845GL/82845GV Graphics and Memory Controller Hub (GMCH)
8460 LAN 10/100 Base-TX Dual Port Transformer Modules
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
845GE MAX-L 制造商:Micro-Star International 功能描述:845GE P4/CELERON 533FSB ATX - Bulk
845GEM-L 制造商:Micro-Star International 功能描述:845GEM-L P4 MATX HYPER-T - Bulk
845GL 制造商:INTEL 制造商全稱:Intel Corporation 功能描述:Intel 82845G/82845GL/82845GV Graphics and Memory Controller Hub (GMCH)
845GLMS-L 制造商:Micro-Star International 功能描述:845GL UATX P4/CEL 400FSB - Bulk
845GR 制造商:SPC 功能描述:New