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Table of Contents
DIO 6533 User Manual vi
©
National Instruments Corporation
AT Device Configuration............................................................................................. 2-5
Bus Interface .................................................................................................. 2-5
Plug and Play Mode......................................................................... 2-5
Switchless Data Acquisition............................................................ 2-5
Base I/O Address Selection............................................... 2-6
DMA Channel Selection ................................................... 2-6
Interrupt Channel Selection............................................... 2-6
Chapter 3
Hardware Overview
Unstrobed I/O ............................................................................................................... 3-4
Strobed I/O—Pattern Generation and Handshaking .................................................... 3-5
Pattern and Change Detection........................................................................ 3-6
Pattern-Detection Triggers .............................................................. 3-6
Change Detection ............................................................................ 3-7
Message Generation ........................................................................ 3-8
Handshaking Protocols .................................................................................. 3-8
8255 Emulation................................................................................ 3-9
Level ACK....................................................................................... 3-9
Leading-Edge Pulse......................................................................... 3-9
Long Pulse ....................................................................................... 3-9
Trailing-Edge Pulse ......................................................................... 3-9
Burst Mode ...................................................................................... 3-10
Comparing Protocols...................................................................................... 3-10
Starting a Handshaking Transfer.................................................................... 3-12
Controlling the Startup Sequence.................................................... 3-12
Controlling Line Polarities .............................................................. 3-13
Transfer Rates............................................................................................................... 3-13
Chapter 4
Signal Connections
I/O Connector............................................................................................................... 4-1
Signal Descriptions ........................................................................................ 4-3
Signal Characteristics ...................................................................... 4-6
Control Signal Summary ................................................................. 4-7
RTSI Bus Interface......................................................................................... 4-7
Board and RTSI Clocks................................................................... 4-8
RTSI Triggers.................................................................................. 4-8
Data Signal Connections .............................................................................................. 4-9
Unstrobed I/O................................................................................................. 4-10
Strobed I/O..................................................................................................... 4-12