Fixed-Point Blockset

Preface

What Is the Fixed-Point Blockset?

The Fixed-Point Blockset includes a collection of blocks that extend the standard Simulink® block library. With these blocks, you can create discrete-time dynamic systems that use fixed-point arithmetic. As a result, Simulink can simulate effects commonly encountered in fixed-point systems for applications such as control systems and time-domain filtering. The Fixed-Point Blockset includes these major features:

• Integer, fractional, and generalized fixed-point data types:
• Unsigned and two's complement formats
• Word size from 1 to 128 bits
• Floating-point data types:
• IEEE-style singles and doubles
• A nonstandard IEEE-style data type, where the fraction (mantissa) can range from 1 to 52 bits and the exponent can range from 1 to 11 bits
• Methods for overflow handling, scaling, and rounding of fixed-point data types
• Tools are provided to facilitate:
• The collection of minimum and maximum simulation values
• The optimization of scaling parameters
• The display of input and output signals
• With the Real-Time Workshop^®, you can generate C code for execution on a fixed-point embedded processor; the generated code uses only integer types and automatically includes all operations, such as shifts, needed to account for differences in fixed-point locations

Exploring the Blockset

To open the Fixed-Point Blockset library, type

fixpt

at the MATLAB® command line, or right-click on the Fixed-Point Blockset listing in the Simulink Library Browser. Double-click on any block icon in the library to see its parameter dialog box. Press the Help button to view the HTML-based help for that block.

Getting Started

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