Chapter 3: Architecture
46
Analog Output Subsystem
Analog output subsystem contains two DACs (Digital to Analog
Converters) and supports the following operating modes:
Single Update
The PowerDAQ PD2-MF(S) boards operate with either a single-update
or streaming (waveform) output configuration. Single-update mode
allows direct write access to the pair of 12-bit DACs. The update
frequency is at least 1kHz for the single update mode. This single
update speed is dependent on your PC system speed.
Event-based Waveform
Event-based waveform mode allows continuous waveform generation
and is not limited by the amount of data. The interrupt-based data
requests, from the board, will be received each time the DSP based
FIFO is ½ full. (with 2K samples on-board FIFO, you can load a
maximum of 1024 samples at a time).
Note
If the FIFO is empty or the last value is outputted,
the board continues outputting the last value.
Continuous (polled-I/O) Waveform
An alternative continuous waveform mode does not require you to use
the event handling mechanism. Using polled I/O, you initialize the
analog output subsystem, and write data to the output buffer (2048
samples). After the application starts, the buffer is downloaded to the
DSP FIFO and the values are outputted to the DAC’s
Summary of Contents for PD2-MF
Page 5: ...Table of Contents iii Index 137 ...
Page 11: ...1 1 Introduction ...
Page 18: ......
Page 19: ...9 2 Installation and Configuration ...
Page 34: ......
Page 35: ...25 3 Architecture ...
Page 63: ...53 4 PowerDAQ Software Development Kit PD SDK ...
Page 106: ......
Page 107: ...97 5 Calibration ...
Page 109: ...99 A Appendix A Specifications ...
Page 110: ...Appendix A Specifications 100 ...
Page 112: ......
Page 113: ...103 B Appendix B Accessories ...
Page 118: ......
Page 119: ...109 C Appendix C Application Notes ...
Page 125: ...115 D Appendix D Warranty ...
Page 128: ......
Page 129: ...119 E Appendix E Glossary ...
Page 152: ......