Connecting Pfi Input Signals; Pfi Filters - National Instruments NI 6221 User Manual

Chapter 8 PFI

Connecting PFI Input Signals

PFI 0
Source

PFI Filters

Note NI-DAQmx only supports filters on counter inputs.
M Series User Manual
All PFI input connections are referenced to D GND. Figure 8-2 shows this
reference, and how to connect an external PFI 0 source and an external
PFI 2 source to two PFI terminals.
PFI 2
Source
Figure 8-2. PFI Input Signals Connections
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. M Series devices use an onboard
oscillator to generate the filter clock with a 40 MHz frequency.
The following is an example of low to high transitions of the input signal.
High to low transitions work similarly.
PFI 0
PFI 2
I/O Connector
M Series Device
8-4
D GND
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