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319537-003US 参数 Datasheet PDF下载

319537-003US图片预览
型号: 319537-003US
PDF下载: 下载PDF文件 查看货源
内容描述: 英特尔系统控制器中心 [Intel System Controller Hub]
分类和应用: 控制器
文件页数/大小: 450 页 / 2593 K
品牌: INTEL [ INTEL ]
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Register and Memory Mapping  
5.3.1  
Legacy Video Area (A0000h – BFFFFh)  
The legacy 128 KB VGA-memory range can be mapped to the Intel Graphics Media  
Adapter (Device 2) or forwarded to an external graphics device located on one of the  
two PCI Express I/O ports. The VGA-Disable bit in the Graphics Control register of the  
Intel Graphics Media Adapter PCI config space can be set to ignore VGA memory or I/O  
cycles. If that bit is set, the Intel® SCH will steer VGA accesses to the appropriate PCI  
Express port. If such a device does not exist in the system, the cycles will be ignored.  
5.3.2  
5.3.3  
5.3.4  
Expansion Area (C0000h – DFFFFh)  
This 128-KB ISA-Expansion region is always mapped to DRAM. This region is typically  
used by BIOS to shadow (copy) option ROMs, including Video BIOS. This region cannot  
be write protected.  
Extended System BIOS Area (E0000h – EFFFFh)  
This area is a single, 64-KB segment that can be assigned independent read/write  
attributes and is mapped only to main DRAM 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 that can be assigned read and write attributes.  
After reset, this region defaults to “disabled” and cycles are forwarded to the LPC  
interface. By manipulating the Read/Write attributes of this memory range, the Intel®  
SCH can “shadow” BIOS into the main DRAM. When disabled, this segment is not  
remapped.  
5.3.5  
5.3.6  
EHCI Controller Area  
The EHCI controller (Device 29, Function 7) requires a single, 1-KB to be reserved out  
of the 1-GB main memory area for configuration purposes. See Chapter 13 for more  
details.  
Programmable Attribute Map (PAM)  
The two, 64-KB memory regions below 1-MB comprise the PAM Memory Area. See  
Table 11 for these ranges and default attributes.  
Any attempts by the processor or an Intel® SCH device to read a segment marked with  
the Read Disable attribute will return undefined data.  
Table 11.  
Programmable Attribute Map  
Default  
Region  
Memory Segments  
Attributes  
“Segment E”  
“Segment F”  
0E0000h – 0EFFFFh  
0F0000h – 0FFFFFh  
R/W  
WE RE  
62  
Datasheet