User manual

Chapter 4 Connecting Signals
NI 6034E/6035E/6036E User Manual 4-32 ni.com
As an output, the WFTRIG signal reflects the trigger that initiates
waveform generation, even if the waveform generation is being externally
triggered by another PFI. The output is an active high pulse with a pulse
width of 50 to 100 ns. This output is set to tri-state at startup.
Figures 4-24 and 4-25 show the input and output timing requirements for
the WFTRIG signal.
Figure 4-24. WFTRIG Input Signal Timing
Figure 4-25. WFTRIG Output Signal Timing
UPDATE* Signal
Any PFI pin can externally input the UPDATE* signal, which is available
as an output on the PFI5/UPDATE* pin.
As an input, the UPDATE* signal is configured in the edge-detection mode.
You can select any PFI pin as the source for UPDATE* and configure the
polarity selection for either rising or falling edge. The selected edge of the
UPDATE* signal updates the outputs of the DACs. In order to use
UPDATE*, you must set the DACs to posted-update mode.
Rising-Edge
Polarity
Falling-Edge
Polarity
t
w
= 10 ns minimum
t
w
t
w
=50to100ns
t
w
UM.book Page 32 Monday, May 14, 2001 10:32 AM