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6700PXH 参数 Datasheet PDF下载

6700PXH图片预览
型号: 6700PXH
PDF下载: 下载PDF文件 查看货源
内容描述: 64位PCI中枢 [64-bit PCI Hub]
分类和应用: PC
文件页数/大小: 194 页 / 2283 K
品牌: INTEL [ INTEL ]
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Signal Description  
2.16.3  
Configuration And Memory Reads  
Intel® 6700PXH 64-bit PCI Hub supports only read dword to internal register space. All  
Configuration and memory reads are accomplished through an SMBus write(s) and later followed  
by an SMBus read to read the status and the read data. For SMBus read transactions, the last byte  
of data (or the PEC byte if enabled) is NACK’d by the master to indicate the end of the transaction.  
The SMBus memory read command returns the status of the previous internal command and the  
data associated previous internal read command. The status field encoding is shown in Table 2-34.  
Table 2-34. SMBus Status Byte Encoding  
Bit  
Description  
7
6
Internal Timeout: This bit is set if an SMBus request is not completed in 2 ms internally.  
Reserved.  
5
Internal Master Abort.  
Internal Target Abort.  
Reserved  
4
3:1  
0
Successful.  
Examples of configuration and memory reads are shown in Figure 2-1 to Figure 2-6. For the  
definition of the diagram conventions below, refer to the SMBus Specification, Revision 2.0.  
Figure 2-1. DWord Configuration Read Protocol (SMBus Block Write/Block Read,  
PEC Enabled)  
S
11X0_XXX  
W A  
A
Cmd = 11010010  
PEC  
A
Byte Count = 4  
A
Bus Number  
A
Device/Function  
A
Reg Number[15:8]  
A
CLOCK  
Reg Number [7:0]  
A P  
STRETCH  
S
11X0_XXX  
11X0_XXX  
W A  
Cmd = 11010010  
Byte Count = 5  
A
A
Sr  
R
A
Status  
A
Data[31:24]  
A
Data[23:16]  
A
Data[15:8]  
N
P
A
Data[7:0]  
A
PEC  
Figure 2-2. DWord Memory Read Protocol (SMBus Block Write/Block Read,  
PEC Enabled)  
S
11X0_XXX  
W A  
Cmd = 11110010  
A
Byte Count = 4  
A
Destination Mem  
A
Add Offset[23:16]  
A
Add Offset[15:8]  
A
CLOCK  
STRETCH  
PEC  
A
P
Add Offset[7:0]  
A
S
11X0_XXX  
11X0_XXX  
W A  
Cmd = 11110010  
Byte Count = 5  
A
A
Sr  
Data[7:0]  
A
R
A
Status  
A
Data[31:24]  
A
Data[23:16]  
A
Data[15:8]  
A
PEC  
N P  
66  
Intel® 6700PXH 64-bit PCI Hub Datasheet