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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  
Software must choose the in-band reset time period comprehending potential mode switches that  
can happen on the PCI-X bus and the associated time period required to settle the voltage and meet  
the minimum PxPCIRST# timing requirements. This could be up to or beyond 320 ms.  
2.17.2.4  
Software PCI Reset (or SBR - Secondary Bus Reset)  
Commonly referred to as the Secondary Bus Reset (SBR), this reset is initiated by a write to the  
bridge control register and resets only the particular PCI segment. This reset can be used for  
various reasons in including recovering from error conditions on the secondary bus, redoing  
enumeration, changing the operating frequency of the bus (33/66/100/133 MHz), changing the  
operating mode of the bus (PCI or PCI-X), etc. This reset is synchronous to the PCI clock domain  
in which it is used. SBR is strictly restricted to the particular PCI segment and affects neither the  
other PCI segment nor the rest of the Intel® 6700PXH 64-bit PCI Hub logic. Writes to the bridge  
control register with a new frequency etc., will have no effect until the SBR happens. The power up  
frequency of the PCI bus is shown in Table 2-36. When hot plug is enabled the bus always powers  
up in PCI 33 MHz mode. With hot plug disabled the frequency depends on the PxM66EN,  
Px133EN, PxPCIXCAP and HPx_SOC/PxMODE2 pins.  
Table 2-36. Power-On Frequency of Intel® 6700PXH 64-bit PCI Hub  
PCI  
Capability  
PCIXCAP  
(on the card)  
PCI-X Capability  
M66EN  
133EN  
33 MHz  
66 MHz  
33 MHz  
66 MHz  
33 MHz  
66 MHz  
33 MHz  
66 MHz  
Not Capable  
GND  
X
X
X
X
GND  
GND  
Not Capable  
1 k-10 kpull-up  
GND  
PCI-X 66 MHz  
PCI-X 66 MHz  
PCI-X 100 MHz  
PCI-X 100 MHz  
PCI-X 133 MHz  
PCI-X 133 MHz  
Pull-down 10 kΩ ±5%  
No Connect  
GND  
Pull-down 10 kΩ ±5%  
Pull-down  
Pull-down  
Pull-up  
0.01 µF capacitor to GND  
0.01 µF capacitor to GND  
0.01 µF capacitor to GND  
0.01 µF capacitor to GND  
No Connect  
GND  
No Connect  
Pull-up  
2.17.2.5  
Hot Plug Reset  
This reset is initiated by a write to the hot plug command register with the change frequency  
command. Note that a write to this register might do any of the following:  
Change the frequency (33/66/100/133 MHz).  
Change the mode (PCI or PCI-X).  
Change nothing but rewrite the present settings.  
Any write (doing any of the three above) will cause a reset of the particular PCI segment to reset.  
This reset is asynchronous by nature to the PCI clock as the hot plug logic runs off of an internal  
clock that ‘may’ be asynchronous to the PCI clock. This reset will cause the any newly written  
frequency or PCI mode information to take effect. The Intel® 6700PXH 64-bit PCI Hub will  
support all changes in mode because of hot plug events including switching from PCI to PCI-X  
protocols or changing the frequency.  
Intel® 6700PXH 64-bit PCI Hub Datasheet  
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