National Instruments 653 Series User Manual page 8

Chapter 3
Timing Diagrams
Pattern I/O Timing Diagrams ........................................................................................3-1
Internal REQ Signal Source ............................................................................3-1
External REQ Signal Source ...........................................................................3-2
Handshaking I/O Timing Diagrams...............................................................................3-4
Comparing the Different Handshaking Protocols ...........................................3-4
Using the Burst Protocol .................................................................................3-5
Using Asynchronous Protocols .......................................................................3-11
Using the 8255-Emulation Protocol ................................................................3-11
Using the Level-ACK Protocol .......................................................................3-17
Using Protocols Based on Signal Edges..........................................................3-22
Using the Trailing-Edge Protocol....................................................................3-22
Appendix A
Specifications
Appendix B
Using PXI with CompactPCI
Appendix C
Connecting Signals with Accessories
Appendix D
Hardware Considerations
Appendix E
Optimizing Your Transfer Rates
Appendix F
Technical Support and Professional Services
Glossary
Index
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Contents
NI 653X User Manual