National Instruments NI 6238 - Manual (Page 10)

Contents
NI 6238/6239 User Manual x ni.com
Chapter 8
PFI
Using PFI Terminals as Timing Input Signals .............................................................. 8-2
Exporting Timing Output Signals Using PFI Terminals............................................... 8-3
Using PFI Terminals as Static Digital Inputs and Outputs............................................ 8-3
Connecting PFI Input Signals........................................................................................ 8-3
PFI Filters ...................................................................................................................... 8-4
I/O Protection ................................................................................................................ 8-5
Programmable Power-Up States.................................................................................... 8-6
Connecting Digital I/O Signals ..................................................................................... 8-6
Chapter 9
Isolation and Digital Isolators
Digital Isolation ............................................................................................................. 9-2
Benefits of an Isolated DAQ Device ............................................................................. 9-2
Reducing Common-Mode Noise ................................................................................... 9-3
Chapter 10
Digital Routing and Clock Generation
Clock Routing................................................................................................................ 10-1
80 MHz Timebase ........................................................................................... 10-2
20 MHz Timebase ........................................................................................... 10-2
100 kHz Timebase .......................................................................................... 10-2
External Reference Clock ............................................................................... 10-2
10 MHz Reference Clock................................................................................ 10-3
Synchronizing Multiple Devices ................................................................................... 10-3
Real-Time System Integration Bus (RTSI) ................................................................... 10-3
RTSI Connector Pinout ................................................................................... 10-4
Using RTSI as Outputs ................................................................................... 10-5
Using RTSI Terminals as Timing Input Signals ............................................. 10-6
RTSI Filters..................................................................................................... 10-6
PXI Clock and Trigger Signals...................................................................................... 10-7
PXI_CLK10 .................................................................................................... 10-8
PXI Triggers.................................................................................................... 10-8
PXI_STAR Trigger ......................................................................................... 10-8
PXI_STAR Filters........................................................................................... 10-8