Network Device User's Manual

Chapter 9 Digital Routing and Clock Generation
NI 6124/6154 User Manual 9-6 ni.com
• Counter n Source, Gate, Z, Internal Output
• Change Detection Event
• Analog Comparison Event
• FREQ OUT
• PFI <0..5>
Note Signals with a * are inverted before being driven on the RTSI terminals.
Using RTSI Terminals as Timing Input Signals
You can use RTSI terminals to route external timing signals to many
different S Series functions. Each RTSI terminal can be routed to any of the
following signals:
• AI Convert Clock (ai/ConvertClock)
• AI Sample Clock (ai/SampleClock)
• AI Start Trigger (ai/StartTrigger)
• AI Reference Trigger (ai/ReferenceTrigger)
• AI Sample Clock Timebase (ai/SampleClockTimebase)
• AO Start Trigger (ao/StartTrigger)
• AO Sample Clock (ao/SampleClock)
• AO Sample Clock Timebase (ao/SampleClockTimebase)
• AO Pause Trigger (ao/PauseTrigger)
• Counter input signals for either counter—Source, Gate, Aux,
HW_Arm, A, B, or Z
• DI Sample Clock (di/SampleClock)
• DO Sample Clock (do/SampleClock)
Most functions allow you to configure the polarity of PFI inputs and
whether the input is edge or level sensitive.
RTSI Filters
You can enable a programmable debouncing filter on each PFI, RTSI, or
PXI_STAR signal. When the filters are enabled, your device samples the
input on each rising edge of a filter clock. S Series devices use an onboard
oscillator to generate the filter clock with a 40 MHz frequency.
Note NI-DAQmx only supports filters on counter inputs.