National Instruments PCI-DIO-96 User Manual page 5

Contents
Chapter 4
Theory of Operation
Functional Overview ..................................................................................................... 4-1
PCI Interface Circuitry.................................................................................... 4-3
82C55A Programmable Peripheral Interface .................................................. 4-3
Timing Specifications.................................................................................................... 4-4
Mode 1 Input Timing ...................................................................................... 4-5
Mode 1 Output Timing ................................................................................... 4-6
Mode 2 Bidirectional Timing.......................................................................... 4-7
Appendix A
Specifications
Appendix B
Register-Level Programming
82C53 Programmable Interval Timer (PCI-DIO-96, PXI-6508 Only) ......................... B-2
Interrupt Control Circuitry .............................................................................. B-2
Register Map and Description ....................................................................................... B-4
Introduction ..................................................................................................... B-4
Register Map ................................................................................................... B-5
Register Descriptions ...................................................................................... B-6
Programming ................................................................................................................. B-14
PCl Local Bus ................................................................................................. B-14
Programming Examples.................................................................................. B-14
Programming Considerations for the 82C55A................................................ B-17
PCI-DIO-96/PXI-6508/PCI-6503 User Manual
Register Description Format............................................................. B-6
Register Description for the 82C55A ............................................... B-6
Register Description for the 82C53
(PCI-DIO-96, PXI-6508 Only) ...................................................... B-9
Register Description for the Interrupt Control Registers.................. B-10
Interrupt Control Register 1.............................................................. B-10
Interrupt Control Register 2.............................................................. B-12
Interrupt Clear Register (PCI-DIO-96, PXI-6508 Only).................. B-13
PCI Initialization............................................................................... B-15
Modes of Operation .......................................................................... B-17
Mode 0-Basic I/O........................................................................... B-18
Mode 1-Strobed Input .................................................................... B-19
Port C Status-Word Bit Definitions for Input (Ports A and B) ........ B-21
Mode 1-Strobed Output ................................................................. B-23
Port C Status-Word Bit Definitions for Output (Ports A and B)...... B-24
Mode 2-Bidirectional Bus.............................................................. B-26
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