Waveform Generation Timing Connections; D/A Start Trigger Signal - Measurement Computing PCI-DAS6034 User Manual

PCI-DAS6034 & PCI-DAS6035 User's Guide
4.3

Waveform Generation Timing Connections

There are three signals that control the timing for the analog output functions on the PCI-
DAS6035. These are D/A START TRIGGER, D/A UPDATE, and D/A EXTERNAL TIME
BASE signals.

4.3.1 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.
Figures 4-14 and 4-15 show the input and output timing requirements for the D/A START
TRIGGER signal.
Figure 4-14. D/A START TRIGGER Input Signal Timing
Figure 4-15. D/A START TRIGGER Output Signal Timing
t = 37.5 ns minimum
w
4–11
Functional Description