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.

The Fixed-Point Blockset library is shown below.

System Requirements

The Fixed-Point Blockset is a multi-platform product that you install on a host computer running any of the operating systems supported by The MathWorks. The Fixed-Point Blockset requires:

MATLAB 6.0 (Release 12)
Simulink 4.0 (Release 12)

In addition, if you want to modify the fixed-point blocks, you need one of the C compilers supported by the mex utility. If you want to generate code from your fixed-point models, you must have the Real-Time Workshop. If you want to create an executable from the generated code, you must have the appropriate C compiler and linker.

Related Products

The MathWorks provides several related products that are relevant to the kinds of tasks you can perform with the Fixed-Point Blockset. The toolboxes listed below all include functions that extend MATLAB capabilities. The blocksets all include blocks that extend Simulink capabilities.

Product	Description
Control System Toolbox	Tool for modeling, analyzing, and designing control systems using classical and modern techniques
DSP Blockset	Simulink block libraries for the design, simulation, and prototyping of digital signal processing systems
Real-Time Workshop	Tool that generates customizable C code from Simulink models and automatically builds programs that can run in real time in a variety of environments
Simulink	Interactive, graphical environment for modeling, simulating, and prototyping dynamic systems
Simulink Report Generator	Tool for documenting information in Simulink and Stateflow in multiple output formats
Stateflow	Tool for graphical modeling and simulation of complex control logic
Stateflow Coder	Tool for generating highly readable, efficient C code from Stateflow diagrams
xPC Target	Tool for adding I/O blocks to Simulink block diagrams and downloading the code generated by Real-Time Workshop to a second PC that runs the xPC Target real-time kernel, for rapid prototyping and hardware-in-the-loop testing of control and DSP systems