Chapter 5
Analog Output
5-8
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You also can specify whether the samples are paused when ao/PauseTrigger
is at a logic high or low level.
Routing AO Pause Trigger Signal to an Output
Terminal
You can route ao/PauseTrigger out to RTSI <0..7>.
AO Sample Clock Signal
Use the AO Sample Clock (ao/SampleClock) signal to initiate AO samples.
Each sample updates the outputs of all of the DACs. You can specify an
internal or external source for ao/SampleClock. You also can specify
whether the DAC update begins on the rising edge or falling edge of
ao/SampleClock.
Using an Internal Source
One of the following internal signals can drive ao/SampleClock.
•
AO Sample Clock Timebase (divided down)
•
Counter
n
Internal Output
A programmable internal counter divides down the AO Sample Clock
Timebase signal.
Using an External Source
Use one of the following external signals as the source of ao/SampleClock:
•
Input PFI <0..5>
•
RTSI <0..7>
•
PXI_STAR
Note
Refer to the
NI 6238/6239 Specifications
for the minimum allowable pulse width
and the propagation delay of PFI <0..5>.
Routing AO Sample Clock Signal to an Output
Terminal
You can route ao/SampleClock (as an active low signal) out to any output
PFI <6..9> or RTSI <0..7> terminal.
