Chapter 6 Digital I/O
X Series User Manual 6-8 ni.com
•PXI_CLK10
•RTSI <0..7>
• PFI <0..15>
•PXI_STAR
• Analog Comparison Event (an analog trigger)
Refer to the Routing Table in MAX for all additional routable signals.
DI Sample Clock Timebase is not available as an output on the I/O
connector. DI Sample Clock Timebase is divided down to provide one of
the possible sources for DI Sample Clock. You can configure the polarity
selection for DI Sample Clock Timebase as either rising or falling edge
except for the 100 MHz Timebase or 20 MHz Timebase.
You might use DI Sample Clock Timebase if you want to use an external
sample clock signal, but need to divide the signal down. If you want to use
an external sample clock signal, but do not need to divide the signal, then
you should use DI Sample Clock rather than DI Sample Clock Timebase.
DI Start Trigger Signal
Use the DI Start Trigger (di/StartTrigger) signal to begin a measurement
acquisition. A measurement acquisition consists of one or more samples.
If you do not use triggers, begin a measurement with a software command.
Once the acquisition begins, configure the acquisition to stop:
• When a certain number of points are sampled (in finite mode)
• After a hardware reference trigger (in finite mode)
• With a software command (in continuous mode)
An acquisition that uses a start trigger (but not a reference trigger) is
sometimes referred to as a posttriggered acquisition.
Retriggerable DI
The DI Start Trigger can also be configured to be retriggerable. The timing
engine will generate the sample and convert clocks for the configured
acquisition in response to each pulse on an DI Start Trigger signal.
The timing engine ignores the DI Start Trigger signal while the clock
generation is in progress. After the clock generation is finished, the timing
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