Active LED
The Active LED can indicate an error or phase-locked loop (PLL) activity. You can change the
Active LED to amber, unless an error overrides the selection.
Tip Changing the Active LED color to amber is helpful when you want to identify
devices in a multi-chassis situation or when you want an indication that your
application has reached a predetermined section of the code.
Table 2. Active LED Color Quick Reference Table
Color Status
Off Module is not yet functional
Green PLL active
Amber User-defined
Red PXI_CLK10 has stopped, or there is a PLL error
Connectors
This section describes the connectors on the front panel of the PXIe-6672.
• CLKIN—AC-coupled, 50 Ω clock input. CLKIN can be programmatically routed to:
– Directly to PXI_CLK10_IN for distribution to other modules in the chassis.
– The reference input of the onboard oscillator's PLL circuit to route to
PXI_CLK10_IN for distribution to other modules in the chassis.
– Any PXI_STAR line.
Note Refer to the PXIe-6672 Specifications for the frequency ranges for each
one of these uses for CLKIN.
• 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 the 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 Synchronous Routing section for more
information about this functionality. You can program the behavior of these PFI
connections individually.
Refer to PXIe-6672 Front Panel on page 8 for a diagram showing the locations of these
connections on the PXIe-6672 front panel.
Caution Connections that exceed any of the maximum ratings of input or output
signals on the PXIe-6672 can damage the module and the computer. National
Instruments is not liable for any damage resulting from such signal connections.
PXIe-6672 User Manual | © National Instruments | 9
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