Chapter 6 Digital I/O
© National Instruments 6-19 X Series User Manual
•PXI_STAR
• Analog Comparison Event (an analog trigger)
DO Sample Clock Timebase is not available as an output on the I/O
connector.
You might use DO 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 DO Sample Clock rather than DO Sample Clock Timebase.
DO Start Trigger Signal
Use the DO Start Trigger (do/StartTrigger) signal to initiate a waveform
generation. If you do not use triggers, you can begin a generation with a
software command.
Retriggerable DO
The DO Start Trigger can also be configured to be retriggerable. The timing
engine will generate the sample clocks for the configured generation in
response to each pulse on a DO Start Trigger signal.
The timing engine ignores the DO Start Trigger signal while the clock
generation is in progress. After the clock generation is finished, the timing
engine waits for another start trigger to begin another clock generation.
Figure 6-8 shows a retriggerable DO of four samples.
Figure 6-8. Retriggerable DO
DO Start Trigger
DO Sample Clock
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