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Chapter 3
Hardware Overview
Connectors
This section describes the connectors on the front panel of the NI PXI-665
x
.
•
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 for the oscillator to route to PXI_CLK10_IN
for distribution to other modules in the chassis.
–
Directly to PXI_CLK10_IN for distribution to other modules in the chassis.
–
Any PXI_STAR line.
Note
Refer to Appendix A Specifications for the frequency ranges for each one of
these uses for CLKIN.
•
CLKOUT
(NI PXI-6653 and NI PXI-6652 only)—Clock Output. This connector is used
to source a clock that can be routed programmatically from the oven-controlled crystal
oscillator (OCXO) or temperature-compensated crystal oscillator (TCXO), direct digital
synthesis (DDS), or backplane clock (PXI_CLK10).
•
PFI <0..5>
—Programmable Function Interface <0..5>. (The NI PXI-6651 supports only
PFI 0..1.) 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 Figures 3-3, 3-4, and 3-5 for diagrams showing the locations of these connections on
the NI PXI-665
x
front panel.
Caution
Connections that exceed any of the maximum ratings of input or output
signals on the NI PXI-665
x
can damage the module and the computer. NI is
not
liable
for any damage resulting from such signal connections.
