Справочник Пользователя для National Instruments NI PXIe-6672

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This section describes the connectors on the front panel of the 
NI PXIe-6672.

•

CLKIN—Clock Input. This connector supplies the module with 
a clock that can be programmatically routed to the onboard PLL 
for use as a reference or routed directly to the PXI backplane 
(PXI_CLK10_IN) for distribution to the other modules in the chassis.

•

CLKOUT—Clock Output. This connector is used to source 
a clock that can be routed programmatically from the 
temperature-compensated crystal oscillator (TCXO), direct 
digital synthesis (DDS), or backplane clock (PXI_CLK10).

•

PFI <0..5>—Programmable Function Interface <0..5>. These 
connectors can be used for either input or output. Additionally, PFI 0 
can be used as a clock input for internally synchronizing other signals. 
Refer to the 

 section for more information about 

this functionality. You can program the behavior of these PFI 
connections individually.

Refer to Figure 3-2 for a diagram showing the locations of these 
connections on the NI PXIe-6672 front panel.

Connections that exceed any of the maximum ratings of input or output signals 

on the NI PXIe-6672 can damage the module and the computer. NI is not liable for any 
damage resulting from such signal connections.

The NI PXIe-6672 perform two broad functions:

•

Generating clock and trigger signals

•

Routing internally or externally generated signals from one location 
to another