Other Timing Requirements - National Instruments NI 6711 User Manual

Chapter 3 Analog Output
Analog Output Series User Manual
The output is an active high pulse. Figure 3-7 shows the timing behavior of
the PFI 5/AO SAMP CLK pin when the pin is an output.
Figure 3-7. PFI 5/AO SAMP CLK as an Output
The PFI 5/AO SAMP CLK is configured as an input by default.

Other Timing Requirements

A counter on your device internally generates ao/SampleClock unless you
select some external source. The ao/StartTrigger signal starts this counter.
It is stopped automatically by hardware after a finite acquisition completes
or manually through software. When using an internally generated
ao/SampleClock in NI-DAQmx, you can also specify a configurable delay
from the ao/StartTrigger to the first ao/SampleClock pulse. By default, this
delay is two ticks of the ao/SampleClockTimebase signal.
Figure 3-8 shows the relationship of the ao/SampleClock signal to the
ao/StartTrigger signal.
ao/SampleClockTimebase
ao/StartTrigger
ao/SampleClock
Figure 3-8. ao/SampleClock and ao/StartTrigger
t
w
t = 50–75 ns
w
Delay
from
Start
Trigger
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