Measurement Computing PCI-DAS6013 - Manual (Page 24)

PCI-DAS6013 and PCI-DAS6014 User's Guide Functional Details
24
t
w
t
w
=23 ns minimum
t
p
t
w
t
p
=50 ns minimum
Figure 15. A/D EXTERNAL TIMEBASE signal timing
A/D STOP signal
The A/D STOP signal indicates a completed acquisition sequence. You can program this signal to be available
at any of the AUXOUT pins. The A/D STOP output signal is a 50 ns wide pulse whose leading edge indicates a
DAQ done condition.
t
w
t
w
= 50 ns
Figure 16. A/D STOP signal timing
Waveform generation timing signals (PCI-DAS6014 only)
The signals that control the timing for the analog output functions on the PCI-DAS6014 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. 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 17 and Figure 18 show the input and output timing requirements for the D/A START TRIGGER signal.