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PCI-DAS6031 & PCI-DAS6033 User's Guide
The A/D START TRIGGER signal is also available as an output and can be programmed to appear at any of the
AUXOUT outputs. Refer to
requirements.
Rising Edge Polarity
Falling Edge Polarity
Use the A/D START TRIGGER signal to initiate pre-triggered DAQ operations (when you need to acquire data
just before a trigger event). In most pre-triggered applications, the A/D START TRIGGER signal is generated
by a software trigger. The use of A/D START TRIGGER and A/D STOP TRIGGER in pre-triggered DAQ
applications is explained next.
A/D STOP TRIGGER signal
Pre-triggered data acquisition continually acquires data into a circular buffer until a specified number of
samples have been collected after the trigger event.
A/D Start Trigger
A/D Stop Trigger
The A/D STOP TRIGGER signal signifies when the circular buffer should stop and when the specified number
of post trigger samples should be acquired. It is available as an output and an input. By default, it is available at
AUXIN2 as an input but may be programmed for access at any of the AUXIN pins or the DAQ-Sync "DS A/D
STOP TRIGGER" input. It may be programmed for access at any of the AUXOUT pins as an output.
When using the A/D STOP TRIGGER signal as an input, the polarity may be configured for either rising or
falling edge. The selected edge of the A/D STOP TRIGGER signal initiates the post-triggered phase of a pre-
triggered acquisition sequence.
Figure 4-4
and
Figure 4-5
Figure 4-4. A/D START TRIGGER input signal timing
Figure 4-5. A/D START TRIGGER output signal timing
Don't care
Start Scan
Convert
Scan Counter
3
2
Figure 4-6. Pre-triggered data acquisition example
for A/D START TRIGGER input and output timing
t
w
t
= 37.5 ns minimum
w
t
w
t
= 50 ns
w
Figure 4-6
illustrates a typical pre-triggered DAQ sequence.
1
0
3
2
1
0
4-5
Functional Details
3
2
1
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