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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  
5.5.3  
CONFIG_ADDRESS—Configuration Address Register  
I/O Offset (Port):  
Default Value:  
0CF8h  
00000000h  
Attribute:  
Size:  
RO, R/W  
32 bits  
CONFIG_ADDRESS is a 32-bit register that can be accessed only as a DW. A Byte or  
Word reference will pass through the Configuration Address Register and onto the  
internal Intel® SCH backbone as an I/O cycle. The CONFIG_ADDRESS register contains  
the Bus Number, Device Number, Function Number, and Register Number for which a  
subsequent configuration access is intended.  
Access  
Bit  
and  
Description  
Default  
Configuration Enable (CFGE):  
R/W  
0b  
31  
0 = Disable accesses to PCI configuration space.  
1 = Enable accesses to PCI configuration space.  
RO  
30:24  
Reserved  
00h  
Bus Number: If the Bus Number is programmed to 00h the target of the  
Configuration Cycle is a PCI Bus 0 agent. If this is the case and the  
Intel® SCH is not the target (i.e., the device number is 3 and not equal  
to 7), then a Type 0 Configuration Cycle is generated.  
R/W  
00h  
If the Bus Number is non-zero, and does not fall within the ranges  
enumerated by Device 1’s Secondary Bus Number or Subordinate Bus  
Number Register, then a Type 1 Configuration Cycle is generated.  
23:16  
This field is mapped to Byte 8 [7:0] of the request header format during  
PCI Express Configuration cycles and A[23:16] during the Type 1  
configuration cycles.  
Device Number: This field selects one agent on the PCI bus selected by  
the Bus Number. When the Bus Number field is “00” the Intel® SCH  
decodes the Device Number field. The Intel® SCH is always Device  
Number 0 for the Host bridge entity, Device Number 1 for the Host-PCI  
Express entity. Therefore, when the Bus Number =0 and the Device  
Number equals 0, 1, 2 or 7 the internal Intel® SCH devices are selected.  
R/W  
00h  
15:11  
This field is mapped to Byte 6 [7:3] of the request header format during  
PCI Configuration cycles.  
Function Number: This field allows the configuration registers of a  
particular function in a multi-function device to be accessed. The Intel®  
SCH ignores configuration cycles to its internal devices if the function  
number is not equal to 0 or 1.  
R/W  
10:8  
000b  
This field is mapped to Byte 6 [2:0] of the request header format during  
PCI Configuration cycles.  
Register Number: This field selects one register within a particular Bus,  
Device, and Function as specified by the other fields in the Configuration  
Address Register.  
R/W  
00h  
7:2  
1:0  
This field is mapped to Byte 7 [7:2] of the request header format for  
during PCI Configuration cycles.  
RO  
Reserved  
00b  
68  
Datasheet