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Contents
© National Instruments Corporation xi NI 6238/6239 User Manual
Chapter 11
Bus Interface
DMA Controllers...........................................................................................................11-1
PXI Considerations........................................................................................................11-2
PXI Clock and Trigger Signals........................................................................11-2
PXI and PXI Express.......................................................................................11-2
Using PXI with CompactPCI ..........................................................................11-3
Data Transfer Methods ..................................................................................................11-3
Direct Memory Access (DMA).......................................................................11-3
Interrupt Request (IRQ)...................................................................................11-4
Programmed I/O..............................................................................................11-4
Changing Data Transfer Methods between DMA and IRQ............................11-4
Chapter 12
Triggering
Triggering with a Digital Source ...................................................................................12-1
Appendix A
Device-Specific Information
NI 6238 ..........................................................................................................................A-1
NI 6239 ..........................................................................................................................A-4
Appendix B
Troubleshooting
Analog Input ..................................................................................................................B-1
Analog Output................................................................................................................B-2
Counters.........................................................................................................................B-3
Appendix C
Technical Support and Professional Services
Glossary
Index
Figures
Figure A-1. NI 6238 Pinout ......................................................................................A-2
Figure A-2. NI 6239 Pinout ......................................................................................A-5