Using An External Source; Routing Ao Sample Clock Signal To An Output Terminal; Other Timing Requirements - National Instruments PCIe-6323 User Manual

• AI Convert Clock (ai/ConvertClock)
• AI Sample Clock (ai/SampleClock)
• DI Sample Clock (di/SampleClock)
• DO Sample Clock (do/SampleClock)
A programmable internal counter divides down the AO Sample Clock Timebase signal.
Several other internal signals can be routed to AO Sample Clock through internal routes. Refer
to Device Routing in MAX in the NI-DAQmx Help or the LabVIEW Help for more information.

Using an External Source

Use one of the following external signals as the source of AO Sample Clock:
• PFI <0..15>
• RTSI <0..7>
• PXI_STAR
• PXIe_DSTAR<A,B>
• Analog Comparison Event (an analog trigger)

Routing AO Sample Clock Signal to an Output Terminal

You can route AO Sample Clock (as an active low signal) out to any PFI <0..15>, RTSI <0..7>,
or PXIe_DSTARC terminal.

Other Timing Requirements

The AO timing engine on your device internally generates AO Sample Clock unless you select
some external source. AO Start Trigger starts the timing engine and either the software or
hardware can stop it once a finite generation completes. When using the AO timing engine, you
can also specify a configurable delay from AO Start Trigger to the first AO Sample Clock pulse.
By default, this delay is two ticks of AO Sample Clock Timebase.
Figure 5-7 shows the relationship of AO Sample Clock to AO Start Trigger.
Figure 5-7. AO Sample Clock and AO Start Trigger
AO Sample Clock Timebase
AO Start Trigger
AO Sample Clock
Delay
From
Start
Trigger
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