Chapter4 ConnectingSignals
©NationalInstruments Corporation 4-31 NI6013/6014 User Manual
Waveform Generation Timing Connections
The analog group defined for the device is controlled by WFTRIG,
UPDATE*,an d UISOURCE.
WFTRIGSignal
AnyPFI pin can externally input the WFTRIG signal, which is available as
an output on the PFI6/WFTRIG pin.
As aninput, WFTRIG is configured in the edge-detection mode. You can
select anyPFI pin as the source for WFTRIG and configure the polarity
selection for either rising or falling edge. The selected edge of WFTRIG
startsthe waveform generation for the DACs. The update interval (UI)
counteris started if you select internally generated UPDATE*.
As anoutput, WFTRIG reflects the trigger that initiates waveform
generation,even if the waveform generation is being externally triggered
byanother PFI. The outpu tis an active high pulse with a pulse width of
50 to 100 ns. This output is set to high-impedance at startup.
Figures 4-24 and 4-25 showthe input and outp ut timing requirements for
WFTRIG.
Figure4-24. WFTRIGInput Signal Timing
Rising-Edge
Polarity
Falling-Edge
Polarity
tw=10 ns minimum
tw