Chapter 4
Signal Connections
PCI-MIO E Series User Manual
4-38
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National Instruments Corporation
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
tw
tw = 10 ns minimum
t w
t w = 50-100 ns
