National Instruments NI 6238, NI 6239 Chapter 8 PFI, Chapter 9 Isolation and Digital Isolators, Chapter 10 Digital Routing and Clock Generation

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
80MHz Timebase ...........................................................................................10-2
20MHz Timebase ...........................................................................................10-2
100kHz Timebase ..........................................................................................10-2
External Reference Clock...............................................................................10-2
10MHz 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