PCI-DAS6030 & PCI-DAS6032 User's Guide
Functional Details
27
Gate Outside Window
Data acquisition is enabled whenever ATRIG is above the THRESH_HI level or below the THRESH_LO level.
Acquisition is suspended whenever the ATRIG signal is between the THRESH_HI and THRESH_LO levels.
This is a level-sensitive gating mode
Figure 26. Gate Outside Window
Waveform generation timing signals
The signals that control the timing for the analog output functions on the PCI-DAS6030 are:
D/A START TRIGGER
D/A UPDATE
D/A EXTERNAL TIME BASE
D/A START TRIGGER signal
The D/A START TRIGGER signal is used to hold off output scans until after a trigger event. The DAQ-Sync
“DS D/A START TRIGGER” input or any AUXIN pin can be programmed to serve as the D/A START
TRIGGER signal. It is also available as an output on any AUXOUT pin.
When used as an input, the D/A START TRIGGER signal may be software selected as either a positive or
negative edge trigger. The selected edge of the D/A START TRIGGER signal causes the DACs to start
generating the output waveform.
The D/A START TRIGGER signal can be used as an output to monitor the trigger that initiates waveform
generation. The output is an active-high pulse having a width of 50 ns.
Figure 27 and Figure 28 show the input and output timing requirements for the D/A START TRIGGER signal.
Rising Edge Polarity
t
w
t
w
= 37.5 ns minimum
Falling Edge Polarity
Figure 27. D/A START TRIGGER input signal timing
Thresh_HI
+2
-2
+1
0
-1
Trigger
Acquired Data
+2
-2
+1
0
-1
Thresh_LO
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