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Table of Contents
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National Instruments Corporation vii AT-MIO-16X User Manual
Chapter 3
Theory of Operation
Functional Overview.....................................................................................................3-1
PC I/O Channel Interface Circuitry ..............................................................................3-2
Analog Input and Data Acquisition Circuitry...............................................................3-5
Analog Input Circuitry ...................................................................................3-6
A/D Converter..................................................................................3-6
Analog Input Multiplexers...............................................................3-6
Analog Input Configuration.............................................................3-6
PGIA ................................................................................................3-7
ADC FIFO Buffer............................................................................3-7
Analog Input Calibration .................................................................3-7
Data Acquisition Timing Circuitry.................................................................3-8
Single-Read Timing.........................................................................3-8
Single-Channel Data Acquisition Timing........................................3-9
Multiple-Channel Data Acquisition ...............................................................3-12
Continuous Scanning Data Acquisition Timing ..............................3-13
Interval Scanning Data Acquisition Timing ....................................3-14
Data Acquisition Rates.....................................................................3-15
Analog Output and Timing Circuitry.............................................................3-15
Analog Output Circuitry ..................................................................3-16
Analog Output Configuration ..........................................................3-17
Analog Output Calibration...............................................................3-17
DAC Waveform Circuitry and Timing...........................................................3-18
DAC Waveform Circuitry................................................................3-18
DAC Waveform Timing Circuitry...................................................3-20
FIFO Continuous Cyclic Waveform Generation.............................3-22
FIFO Programmed Cyclic Waveform Generation...........................3-23
FIFO Pulsed Waveform Generation ................................................3-23
Digital I/O Circuitry......................................................................................................3-24
Timing I/O Circuitry.....................................................................................................3-25
RTSI Bus Interface Circuitry........................................................................................3-29
Chapter 4
Register Map and Descriptions
Register Map.................................................................................................................4-1
Register Sizes .................................................................................................4-3
Register Description Format...........................................................................4-3
Configuration and Status Register Group.......................................................4-4
Command Register 1........................................................................4-5
Command Register 2........................................................................4-9