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© National Instruments Corporation ix NI 6124/6154 User Manual
Frequency Output Signal.................................................................................7-30
Routing Frequency Output to a Terminal .........................................7-30
Default Counter/Timer Pinouts......................................................................................7-30
Counter Triggering ........................................................................................................7-31
Other Counter Features..................................................................................................7-32
Cascading Counters.........................................................................................7-32
Counter Filters.................................................................................................7-32
Prescaling ........................................................................................................7-33
Duplicate Count Prevention ............................................................................7-34
Example Application That Works Correctly (No Duplicate Counting)... 7-35
Example Application That Works Incorrectly (Duplicate Counting) ....7-36
Example Application That Prevents Duplicate Count......................7-36
When To Use Duplicate Count Prevention.......................................7-37
Enabling Duplicate Count Prevention in NI-DAQmx ......................7-37
Synchronization Modes...................................................................................7-37
80 MHz Source Mode.......................................................................7-38
Other Internal Source Mode..............................................................7-39
External Source Mode.......................................................................7-39
Chapter 8
Programmable Function Interfaces (PFI)
PFI for Non-Isolated Devices ........................................................................................8-1
PFI for Isolated Devices ................................................................................................8-2
Using PFI Terminals as Timing Input Signals...............................................................8-4
Exporting Timing Output Signals Using PFI Terminals ...............................................8-4
Using PFI Terminals as Static Digital Inputs and Outputs............................................8-5
Connecting PFI Input Signals........................................................................................8-6
PFI Filters ......................................................................................................................8-6
I/O Protection.................................................................................................................8-8
Programmable Power-Up States....................................................................................8-8
Chapter 9
Digital Routing and Clock Generation
Clock Routing................................................................................................................9-1
80 MHz Timebase ...........................................................................................9-2
20 MHz Timebase ...........................................................................................9-2
100 kHz Timebase...........................................................................................9-2
External Reference Clock................................................................................9-2
10 MHz Reference Clock................................................................................9-3
Synchronizing Multiple Devices ...................................................................................9-3