National Instruments AT-MIO-16X - Manual (Page 6)

Table of Contents
© 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