Waveform Generation Timing Signals; Ao Start Trigger Signal; Using A Digital Source - National Instruments PXI-6070E User Manual

Waveform Generation Timing Signals

RTSI 7
Master
Timebase
20 MHz
Timebase

AO Start Trigger Signal

© National Instruments Corporation
There is one AO Sample Clock that causes all AO channels to update
simultaneously. Figure 3-5 summarizes the timing and routing options
provided by the analog output timing engine.
PFI 0–9,
RTSI 0–6
Onboard
ao/SampleClock
Clock
÷
200
Figure 3-5. Analog Output Timing Engine
You can use the AO Start Trigger (ao/StartTrigger) signal to initiate a
waveform generation. If you do not use triggers, you begin a generation
with a software command.

Using a Digital Source

To use ao/StartTrigger, specify a source and an edge. The source can be an
external signal connected to any PFI or RTSI <0..6> pin. The source can
also be one of several internal signal on your DAQ device. Refer to Device
Routing in MAX in the NI-DAQmx Help or the LabVIEW 8.x Help for more
information.
Figure 3-6 shows the timing requirements of the ao/StartTrigger digital
source.
Rising-Edge
Polarity
Falling-Edge
Polarity
Figure 3-6. ao/StartTrigger Digital Source Timing Requirements
Ctr1InternalOutput
Onboard
Timebase
Clock
Divisor
t
w
t = 10 ns minimum
w
3-9
Chapter 3 Analog Output
PFI 0–9,
ao/SampleClock
RTSI 0–6
÷
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