Version 5.0 (R14) Simulink Fixed Point Software :: Simulink Fixed Point Release Notes (Simulink® Fixed Point™)

Version 5.0 (R14) Simulink^® Fixed Point™ Software Release Notes

Version 5.2 (R2006a) Simulink Fixed Point Software

Version 4.1 (R13SP1) Fixed-Point Blockset Software

Version 5.0 (R14) Simulink Fixed Point Software

This table summarizes what's new in Version 5.0 (R14):

New Features and Changes	Version Compatibility Considerations	Fixed Bugs and Known Problems	Related Documentation at Web Site
Yes Details below	Yes—Details labeled as Compatibility Considerations, below. See also Summary.	Yes Details	No

New features and changes introduced in this version are

Product Restructuring

The Fixed-Point Blockset has been replaced by two new products, Fixed-Point Toolbox™ and Simulink Fixed Point. This product restructuring reflects the broad expansion of fixed-point capabilities in the MATLAB and Simulink software. The Fixed-Point Toolbox product introduces fixed-point operations to the MATLAB language, and the Simulink Fixed Point product enables fixed-point capabilities across much of the Simulink product family.

The Simulink Fixed Point software requires the Fixed-Point Toolbox software. If you are on maintenance, you will automatically receive both of these new products in place of the Fixed-Point Blockset software.

Fixed-Point Blocks Fully Integrated into Simulink Software

All former Fixed-Point Blockset blocks have been moved into the Simulink block libraries with this release. Each of these blocks, as well as all other Simulink blocks, can be used with or without the Simulink Fixed Point software installed. You can share models with any fixed-point and floating-point Simulink blocks among the users in your organization, whether or not they have the Simulink Fixed Point software installed. However, a Simulink Fixed Point software license is required to take full advantage of the fixed-point features of Simulink blocks. For more information, refer to Sharing Fixed-Point Models in the Simulink Fixed Point User's Guide.

The following table lists all of the blocks in the Fixed-Point Blockset software as of Release 13. It tells you the current name of the block in the Simulink software and the Simulink library in which you can find the block. Most blocks have the same name as in the last release; however, some block names have changed.

Former Fixed-Point Blockset Block	Former Fixed-Point Blockset Library	Simulink Block	Simulink Library
Abs	Math	Abs	Math Operations
Accumulator	Calculus	Discrete-Time Integrator	Discrete
Accumulator Resettable	Calculus	Discrete-Time Integrator	Discrete
Accumulator Resettable Limited	Calculus	Discrete-Time Integrator	Discrete
Add	Math	Add	Math Operations
Bit Clear	Bits	Bit Clear	Logic and Bit Operations
Bit Set	Bits	Bit Set	Logic and Bit Operations
Bitwise Operator	Bits	Bitwise Operator	Logic and Bit Operations
Compare To Constant	Logic & Comparison	Compare To Constant	Logic and Bit Operations
Compare To Zero	Logic & Comparison	Compare To Zero	Logic and Bit Operations
Constant	Sources	Constant	Sources
Conversion	Data Type	Data Type Conversion	Signal Attributes
Conversion Inherited	Data Type	Data Type Conversion Inherited	Signal Attributes
Cosine	Lookup	Cosine	Lookup Tables
Counter Free	Sources	Counter Free-Running	Sources
Counter Limited	Sources	Counter Limited	Sources
Data Type Duplicate	Data Type	Data Type Duplicate	Signal Attributes
Data Type Propagation	Data Type	Data Type Propagation	Signal Attributes
Dead Zone	Nonlinear	Dead Zone	Discontinuities
Dead Zone Dynamic	Nonlinear	Dead Zone Dynamic	Discontinuities
Decrement Real World	Math	Decrement Real World	Additional Math & Discrete / Additional Math: Increment - Decrement
Decrement Stored Integer	Math	Decrement Stored Integer	Additional Math & Discrete / Additional Math: Increment - Decrement
Decrement Time To Zero	Math	Decrement Time To Zero	Additional Math & Discrete / Additional Math: Increment - Decrement
Decrement To Zero	Math	Decrement To Zero	Additional Math & Discrete / Additional Math: Increment - Decrement
Derivative	Calculus	Discrete Derivative	Discrete
Detect Change	Edge Detect	Detect Change	Logic and Bit Operations
Detect Decrease	Edge Detect	Detect Decrease	Logic and Bit Operations
Detect Fall Negative	Edge Detect	Detect Fall Negative	Logic and Bit Operations
Detect Fall Nonpositive	Edge Detect	Detect Fall Nonpositive	Logic and Bit Operations
Detect Increase	Edge Detect	Detect Increase	Logic and Bit Operations
Detect Rise Nonnegative	Edge Detect	Detect Rise Nonnegative	Logic and Bit Operations
Detect Rise Positive	Edge Detect	Detect Rise Positive	Logic and Bit Operations
Difference	Calculus	Difference	Discrete
Divide	Math	Divide	Math Operations
Dot Product	Math	Dot Product	Math Operations
Filter Direct Form I	Filters	This block is obsolete.
Filter Direct Form I Time Varying	Filters	This block is obsolete.
Filter Direct Form II	Filters	Transfer Fcn Direct Form II	Additional Math & Discrete / Additional Discrete
Filter Direct Form II Time Varying	Filters	Transfer Fcn Direct Form II Time Varying	Additional Math & Discrete / Additional Discrete
Filter First Order	Filters	Transfer Fcn First Order	Discrete
Filter Lead or Lag	Filters	Transfer Fcn Lead or Lag	Discrete
Filter Real Zero	Filters	Transfer Fcn Real Zero	Discrete
FIR	Filters	Weighted Moving Average	Discrete
Gain	Math	Gain	Math Operations
Gateway In	Data Type	Data Type Conversion	Signal Attributes
Gateway In Inherited	Data Type	Data Type Conversion Inherited	Signal Attributes
Gateway Out	Data Type	Data Type Conversion	Signal Attributes
Increment Real World	Math	Increment Real World	Additional Math & Discrete / Additional Math: Increment - Decrement
Increment Stored Integer	Math	Increment Stored Integer	Additional Math & Discrete / Additional Math: Increment - Decrement
Index Vector	Select	Index Vector	Signal Routing
Integer Delay	Delays & Holds	Integer Delay	Discrete
Integrator Backward	Calculus	Discrete-Time Integrator	Discrete
Integrator Backward Resettable	Calculus	Discrete-Time Integrator	Discrete
Integrator Backward Resettable Limited	Calculus	Discrete-Time Integrator	Discrete
Integrator Forward	Calculus	Discrete-Time Integrator	Discrete
Integrator Forward Resettable	Calculus	Discrete-Time Integrator	Discrete
Integrator Forward Resettable Limited	Calculus	Discrete-Time Integrator	Discrete
Integrator Trapezoidal	Calculus	Discrete-Time Integrator	Discrete
Integrator Trapezoidal Resettable	Calculus	Discrete-Time Integrator	Discrete
Integrator Trapezoidal Resettable Limited	Calculus	Discrete-Time Integrator	Discrete
Interval Test	Logic & Comparison	Interval Test	Logic and Bit Operations
Interval Test Dynamic	Logic & Comparison	Interval Test Dynamic	Logic and Bit Operations
Logical Operator	Logic & Comparison	Logical Operator	Logic and Bit Operations
Lookup Table	Lookup	Lookup Table	Lookup Tables
Lookup Table Dynamic	Lookup	Lookup Table Dynamic	Lookup Tables
Lookup Table (2-D)	Lookup	Lookup Table (2-D)	Lookup Tables
Matrix Gain	Math	Gain	Math Operations
MinMax	Math	MinMax	Math Operations
MinMax Running Resettable	Math	MinMax Running Resettable	Math Operations
Multiply	Math	Product	Math Operations
Multiply Matrix	Math	Product	Math Operations
Multi-Port Switch	Select	Multiport Switch	Signal Routing
Product	Math	Product	Math Operations
Product of Elements	Math	Product of Elements	Math Operations
Product of Elements Inverted	Math	Product of Elements	Math Operations
Rate Limiter	Nonlinear	Rate Limiter	Discontinuities
Rate Limiter Dynamic	Nonlinear	Rate Limiter Dynamic	Discontinuities
Relational Operator	Logic & Comparison	Relational Operator	Logic and Bit Operations
Relay	Nonlinear	Relay	Discontinuities
Repeating Sequence Interpolated	Sources	Repeating Sequence Interpolated	Sources
Repeating Sequence Stair	Sources	Repeating Sequence Stair	Sources
Sample Rate Probe	Calculus	Weighted Sample Time	Signal Attributes
Sample Time Add	Calculus	Weighted Sample Time	Signal Attributes
Sample Time Divide	Calculus	Weighted Sample Time	Signal Attributes
Sample Time Multiply	Calculus	Weighted Sample Time	Signal Attributes
Sample Time Probe	Calculus	Weighted Sample Time	Signal Attributes
Sample Time Subtract	Calculus	Weighted Sample Time	Signal Attributes
Saturation	Nonlinear	Saturation	Discontinuities
Saturation Dynamic	Nonlinear	Saturation Dynamic	Discontinuities
Scaling Strip	Data Type	Data Type Scaling Strip	Signal Attributes
Shift Arithmetic	Bits	Shift Arithmetic	Logic and Bit Operations
Sign	Nonlinear	Sign	Math Operations
Sine	Lookup	Sine	Lookup Tables
State-Space	Filters	Fixed-Point State-Space	Additional Math & Discrete / Additional Discrete
Subtract	Math	Subtract	Math Operations
Sum	Math	Sum	Math Operations
Sum of Elements	Math	Sum of Elements	Math Operations
Sum of Elements Negated	Math	Sum of Elements	Math Operations
Switch	Select	Switch	Signal Routing
Tapped Delay	Delays & Holds	Tapped Delay	Discrete
Unary Minus	Math	Unary Minus	Math Operations
Unit Delay	Delays & Holds	Unit Delay	Discrete
Unit Delay Enabled	Delays & Holds	Unit Delay Enabled	Additional Math & Discrete / Additional Discrete
Unit Delay Enabled External IC	Delays & Holds	Unit Delay Enabled External IC	Additional Math & Discrete / Additional Discrete
Unit Delay Enabled Resettable	Delays & Holds	Unit Delay Enabled Resettable	Additional Math & Discrete / Additional Discrete
Unit Delay Enabled Resettable External IC	Delays & Holds	Unit Delay Enabled Resettable External IC	Additional Math & Discrete / Additional Discrete
Unit Delay External IC	Delays & Holds	Unit Delay External IC	Additional Math & Discrete / Additional Discrete
Unit Delay Resettable	Delays & Holds	Unit Delay Resettable	Additional Math & Discrete / Additional Discrete
Unit Delay Resettable External IC	Delays & Holds	Unit Delay Resettable External IC	Additional Math & Discrete / Additional Discrete
Unit Delay With Preview Enabled	Delays & Holds	Unit Delay With Preview Enabled	Additional Math & Discrete / Additional Discrete
Unit Delay With Preview Enabled Resettable	Delays & Holds	Unit Delay With Preview Enabled Resettable	Additional Math & Discrete / Additional Discrete
Unit Delay With Preview Enabled Resettable External RV	Delays & Holds	Unit Delay With Preview Enabled Resettable External RV	Additional Math & Discrete / Additional Discrete
Unit Delay With Preview Resettable	Delays & Holds	Unit Delay With Preview Resettable	Additional Math & Discrete / Additional Discrete
Unit Delay Preview Resettable External RV	Delays & Holds	Unit Delay With Preview Resettable External RV	Additional Math & Discrete / Additional Discrete
Wrap To Zero	Nonlinear	Wrap To Zero	Discontinuities
Zero-Order Hold	Delays & Holds	Zero-Order Hold	Discrete

API for User-Written Fixed-Point S-Functions

You can now write your own Simulink C S-functions that directly handle fixed-point data types with a newly published API. For more information, refer to Writing Fixed-Point S-Functions in the Simulink Fixed Point User's Guide.

Fixed-Point Advisor

The Simulink Fixed Point software now includes Model Advisor checks to help you to configure your fixed-point models to achieve a more efficient design and optimize your generated code. To use the Model Advisor to check your fixed-point models:

Select Model Advisor from the Tools menu of the model you wish to analyze. The Model Advisor appears in the Documents window on the MATLAB desktop.
Click Select All to enable all Model Advisor checks. For fixed-point code generation, the most important check boxes to select are Identify questionable fixed-point operations, Identify blocks that generate expensive saturation and rounding code, and Check the Hardware Implementation.
Click Check Model. Any tips for improving the efficiency of your fixed-point model appear in the browser.

Arithmetic with Non-Zero Bias Fully Supported

Code generation has been enhanced to generate bit-true fixed-point code that supports multiplication, division, and reciprocal for signal and parameters with non-zero bias. Previously, these cases lead to code generation errors. Code will now be generated for these cases, and that code will make efficient use of just C integer operations.

Generated Code for Lookup Tables Uses Less ROM

In prior releases, the size of the generated code for models that contained lookup tables with similar attributes was larger than necessary. Such lookup tables produced similar algorithms that appeared throughout the code multiple times. In this release, some common algorithms have been placed into functions which are called by the lookup tables. This enables the same code to be reused multiple times. The overall size of the generated code has been reduced through this enhancement.

Functions Moved to Simulink Software

The following former Fixed-Point Blockset functions are now installed with the Simulink software:

Obsolete Functions

The functions fixpt_restore_links and fpupdate are obsolete.

Compatibility Considerations

These functions are no longer needed to update models.

Major Bug Fixes

This section summarizes the major bug fixes introduced in Version 5.0 of the Simulink Fixed Point software.

Simulation Error for 65-Bit+ Multiplication Corrected

In prior releases, fixed-point multiplication could produce the wrong answer under certain simulation conditions. For this error to occur, one input had to have at least 33 bits and the other input at least 32 bits. The correct answer had to be negative, and some additional numerical criteria had to be met. This error could only occur in simulation; it never occurred in generated code. This error has been fully corrected for this release.

Fixed-Point Settings Interface Usable for Large Fonts

In the previous release, the Fixed-Point Settings interface was unusable if your system setup defined large default system fonts. When trying to open the dialog, an error would be reported and the dialog would not appear. The creation of the dialog has now been made robust to large fonts, and this problem is solved.

Lookup Table (2-D) Code Generation Bug Fixed

In a previous release, code generation would error out for the Lookup Table (2-D) block if the input data type had non-zero bias or non-one fractional slope, and the corresponding breakpoints were evenly spaced. This problem has been fixed.

Version 5.2 (R2006a) Simulink Fixed Point Software

Version 4.1 (R13SP1) Fixed-Point Blockset Software