Waveform Generation Timing Signals; D/A Start Trigger Signal - Measurement Computing PCI-DAS6052 User Manual

PCI-DAS6052 User's Guide

Waveform generation timing signals

The signals that control the timing for the analog output functions on the PCI-DAS6052
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 4-23
D/A START TRIGGER signal.
Rising Edge Polarity
Falling Edge Polarity
and Fi gure 4-24 show the input and output timing requirements for the
Figure 4-23. D/A START TRIGGER Input Signal Timing
t
w
t = 37.5 ns minimum
w
4-21
Functional Details