Mathworks SIMULINK FIXED POINT RELEASE NOTES

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Simulink

Fixed Point™

Release Notes

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Fixed Point™ Release Notes

Summary by Version ............................... 1

Contents

Version 6.3 (R2010a) Simulink

Software

........................................ 4

Version 6.2 (R2009b) Simulink

Software

........................................ 10

Version 6.1 (R2009a) Simulink

Software

........................................ 18

Version 6.0 (R2008b) Simulink

Software

........................................ 24

Version 5.6.1 (R2008a+) Simulink

Software

Version 5.6 (R2008a) Simulink

Software

........................................ 30

........................................ 31

Version 5.5.1 (R2007b+) Simulink

Software

........................................ 33

Fixed Point

Version 5.5 (R2007b) Simulink

Software

........................................ 34

Version 5.4.1 (R2007a+) Simulink

Software

Version 5.4 (R2007a) Simulink

Software

Version 5.3 (R2006b) Simulink

Software

........................................ 37

........................................ 38

........................................ 39

Fixed Point

iii

Version 5.2.1 (R2006a+) Simulink®Fixed Point

Software

........................................ 40

Version 5.2 (R2006a) Simulink

Software

........................................ 41

Version 5.0 (R14) Simulink

Fixed Point

Fixed Point Software .... 43

Version 4.1 (R13SP1) Fixed-Point Blockset Software

Version 4.0.1 (R13+) Fixed-Point Blockset Software

Version 4.0 (R13) Fixed-Point Blockset Software

Compatibility Summary for Simulink

Software

........................................ 66

Fixed Point

..... 61

.. 55

... 58

iv Contents

SummarybyVersion

This table provides quick access to what’s new in each version. For clarification, see “Using Release Notes” on page 2 .

Simulink®Fixed Point™ Release Notes

Version (Release)

Latest Versi V6.3 (R2010a

V6.2 (R2009b)

V6.1 (R2009a)

V6.0 (R2

V5.6.1 (R2008a+)

V5.6 (R2008a)

1 (R2007b+)

V5.5.

V5.5 (R2007b)

)

008b)

New Features and Changes

Yes Details

No No Bug Reports

Yes

Detai

No No Bug Reports

Yes Details

Version Compatibilit Consideratio

No Bug Reports

Yes Summary

No Bug Re

Yes Summary

Fixed Bugs and Known Problems

Includes fix

Includes fixes

Bug Repor Includes

Bug Reports Includes fixes

Includes fixes

Inclu

Includes fixes

Bug Reports Includes fixes

fixes

ports

des fixes

Related Documentation at Web Site

Printable Release

Notes: PDF

Current product documentation

V5.4.1 (R2007a+)

.4 (R2007a)

V5.3 (R2006b)

No No Bug

Inc

Yes Details

No Bug Reports

Includes fixes

No Bug Reports No

Reports

ludes fixes

Simulink®Fixed Point™ Release Notes

Version (Release)

V5.2.1 (R2006a+)

V5.2 (R2006a)

V5.0 (R14)

V4.1 (R13SP1)

V4.0.1 (R13+)

V4.0 (R13)

New Features and Changes

No No Bug Reports

Version Compatibility Considerations

Fixed Bugs and Known Problems

Related Documentation at Web Site

at Web site

Yes Details

No Bug Reports

at Web site

Yes Summary

Yes Details

No Yes

Details

Yes

Fixed b ugs

Summary

Yes

No bug fixes

Summary

Using Release Notes

Use release notes when upgrading to a newer version to learn about:

• New features

• Changes

• Potential impact on your existing files and practices

Review the release notes for other MathWorks™ products required for this product (for example, MATLAB

or Simulink®). Determine if enhancements,

bugs, or compatibility considerations in other products impact you.

If you are upgrading from a software version other than the m ost recent one, review the current release notes and all interim versions. For example, when you upg rade from V1.0 to V1.2, review the release notes for V1.1 and V1.2.

SummarybyVersion

What Is in the Rel

New Features and

• New functional

• Changes to exi

Version Compa

When a new fea versions, th impact.

Compatibil Reports at in incompa compatibi

Fixed Bug

The Math view Bug time and provisi availa is not a

ity issues reported after the product release appear under Bug The MathWorks™ W eb site. Bug fixes can sometimes result tibilities, so review the fixed bugs in Bug Reports for any

lity impact.

sandKnownProblems

Works offers a user-searchable Bug Reports database so you can Reports. The development team updates this database at release as more information becomes available. Bug Reports include

ons for any known workarounds or file replacements. Information is

ble for bugs existing in or fixed in Release 14SP2 or later. Information

vailable for all bugs in earlier releases.

ity

sting functionality

tibility Considerations

ture or change introduces a reported incompatibility between

e Compatibility Considerations subsection explains the

ease Notes

Changes

s Bug Reports using your MathWorks Account.

Acces

Simulink®Fixed Point™ Release Notes

Version 6.3 (R2010a) Simulink Fixed Point Software

This table summarizes what’s new in Version 6.3 (R2010a):

New Features and Changes

Yes Details below

Version Compatibility Considerations

No Bug Reports

New features and changes introduced in this version are

• “Trigonometric Function Block Supports CORDIC Algorithm and

Fixed-Point Signals” on page 5

• “Elimination of Double-Precision Conversions for Algorithms that M ix

Single P recis ion with Integer or Fixed-Point Data” on page 5

• “Improved Automatic Scaling Handles Data Type Constraints for Several

Simulink Blocks” on page 5

• “Direct Lookup Ta bl e (n-D) Block Supports Fixed-Point Signa ls” on pa ge 6

• “Increased Efficiency of Division by Constant Pow er of 2” on page 6

• “Fixed-Point Advisor Supports Restore Points” on page 6

• “Improved Fixed-Point Advisor Handling of Unsupported Blocks” on page 7

Fixed Bugs an d Known Problems

Includes fixes

Related Documentation at Web Site

Printable Release Notes: PDF

Current product documentation

• “Enhanced Target Function Library Support” on page 7

• “Stateflow Support for Chart-Level Data with Fixed-Point Word Lengths

Up to 128 Bits” on page 8

• “Root Inport Support for Fixed-Point Data Contained in a Structure” on

page 8

• “To File and From File Blocks Support Fixed-Point Data” on page 9

Version 6.3 (R2010a) Simulink®Fixed Point™ Software

Trigonometric F Algorithm and Fi

The Trigonometr signals when yo is CORDIC.

u select

Elimination o Algorithms t Fixed-Point

In R2010a, c unnecessar intermedia

• Results in

• Enables si

arithmet

Improve Constra

Autosc data ty autosc

asting from single to fixed-point data types no longer inserts

y intermediate double-precision variables. Removing these

te variables:

more efficient code, particularly for embedded targets.

ngle to fixed-point casts for targets without double-precision

ic support.

d Automatic Scaling Handles Data Type

ints for Several Simulink Blocks

aling with the Fixed-Point Tool and Fixed-Point A dvisor now handles

pe constraints for ports on several Simulink blocks. For example,

aling now takes into account that:

unction Block Supports CORDIC

xed-Point Signals

ic Function block now accepts and outputs fixed-point

sin, cos,orsincos and the approximation method

f Double-Precision Conversions for

hat Mix Single Precision with Integer or

Data

• The in

singl

• The i

data

• The i

dat

Thi the

formation when you accept autoscaling proposals. For more information,

dex port of the Selector and Assignment blocks support only

, and built-in integer data types.

nput port of the Data Type Conversion supports only built-in integer types when the block is configured to output an enumerated type.

ndex port of the Interpolation Using Prelookup supports only integer

atypes.

s improved autoscaling reduces data type mismatch errors and enables

Fixed-Point Tool and Fixed-Point Advisor to provide additional diagnostic

double,

Simulink®Fixed Point™ Release Notes

see “Constrained Data Type Summary” in the Simulink®Fixed Point™ User’s Guide.

Direct Lookup Table (n-D) Block Suppor ts Fixed-Point Signals

The Direct Lookup Table (n-D) block accepts fixed-point data types for the table input port.

Increased Efficiency of Division by Constant Power of 2

In R2010a, the Real-Time Workshop®software no longer unconditionally replaces divisions by constant power of 2 with casts. The software now replaces division by constant power of 2 with a cast only if this replacement results in less generated code. This enhancement relies on the target compiler to optimiz e the division appropriate to the target processor.

The decision whether to replace the division is based on these guidelines:

• If the replacement by a cast results in extra rou n ding code, Real-Time

Workshop does not replace the division.

• If the division requires a helper function, Real-Time Workshop replaces the

division with a cast even if the cast requires extra rounding code.

For more information, see “Improving Efficiency of Code That Uses Division by Constant Power of 2” in the Real-Time Workshop U ser’s Guide.

Fixed-Point Advisor Supports Restore Points

The Fixed-Point Advisor now supports restore points. Restore points provide you with the ability to:

• Save a snapshot of your model at any time during conversion from floating

point to fixed point.

• Revert any changes made in response to advice from the Fixed-Point

Advisor.

Version 6.3 (R2010a) Simulink®Fixed Point™ Software

• Load and rerun from any restore point without the need to run through the

entire conversion process.

For more information, see “Restore Points” in the Simulink Fixed Point User’s Guide.

Improved Fixed-Point Advisor Handling of Unsupported Blocks

The Fixed-Point Advisor now provides:

• A wired-subsystem replacement for the State-Space block.

• A preview of the replacement options for an unsupported block, when

available.

• A new context menu option to replace an unsupported block.

For more information, see “Address unsupported blocks” in the Fixe d-Point Advisor Reference.

Enhanced Target Function Library Support

Target Function Library enhancements include:

• Ability to create custom Target Function Library entries

TFLs now support custom entries that allow you to specify near-arbitrary match criteria. You first create your own TFL entry class, derived from either

RTW.TflCOperationEntryML (for operation replacement). In y our derived

class, you implement a customize the match criteria. You also can modify the implementation signature to meet your application needs. For more information, see “Refining TFL Matching and Replacement Using Custom TFL Table Entries” in the Real-Time Workshop

• Additional scalar operator replacemen ts

RTW.TflCFunctionEntryML (for function replacement) or

do_match method with a fixed preset signature a nd

Embedded Coder™ documentation.

- New TFL support for replacing scalar complex operations, including

addition, subtraction, multiplication, cast, and complex conjugate. Mixed types are supported.

Simulink®Fixed Point™ Release Notes

- Additionally, y ou can now replace fixed-point shift right for all

fixed-point input types.

Stateflow Support for Chart-Level Data with Fixed-Point Word Lengths Up to 128 Bits

Stateflow®chart-level data now support up to 128 bits of fixed-point precision for the following scopes:

• Input

• Output

• Parameter

• Data Store Memory

This increase in maximum precision from enhancements:

• Supports generating efficient code for targets with non-standard word sizes

• Allows charts to work with large fixed-point signals

You can explicitly pass chart-level data with these fixed-point word lengths as inputs and outputs of the following functions:

• Embedded MATLAB

• Simulink functions

• Truth table functions that use Embedded MATLAB action language

For more information, see “Using Fixed-Point Data in Stateflow Charts” in the Stateflow and Stateflow

functions

Coder™ User’s Guide

32 to 128 bits provides these

Root Inport Support for Fixed-Point Data Contained in a Structure

You can now use a root (top-level) Inport block to supply fixed-point data that is contained in a structure. In releases before R2010a, you had to use a

Simulink.Timeseries object instead of a structure.

Version 6.3 (R2010a) Simulink®Fixed Point™ Software

To File and From F

TheToFileandFr length of up to

om File blocks now support fixed-p oin t data with a word

bits.

ile Blocks Support Fixed-Point Data

Simulink®Fixed Point™ Release Notes

Version 6.2 (R2009b) Simulink Fixed Point Software

This table summarizes what’s new in Version 6.2 (R2009b):

New Features and Changes

Yes Details below

Version Compatibility Considerations

No Bug Reports

New features and changes introduced in this version are

• “Discrete Transfer Function Block Supports Fixed-Point Intrinsically” on

page 11

• “New PID Controller Blocks Support Fixed-Point Intrinsically” on page 11

• “Rapid Accelerator Mode Now Supports All Fixed-Point Word Leng ths

for Parameters” on page 11

• “Lookup Table (n-D) Block Supports Parameter Data Types Different from

Signal Data Types” on page 11

• “Reduced Memory Use and More Efficient Code for Evenly-Spaced

Breakpoints in Prelookup and Lookup T able (n-D) Blocks” on page 12

• “Math Function Block Enhancements for Real-Time Workshop Code

Generation” on page 13

Fixed Bugs an d Known Problems

Includes fixes

Related Documentation at Web Site

Printable Release Notes: PDF

Current product documentation

• “Improved Fixed-Point Advisor Workflow” on page 13

• “New Optimization Option to Allow Integer Division to Handle Net Slopes

that are Reciprocals of Integers” on page 13

• “Enhanced Model Advisor Check Identifies Opportunities to Improve Code

Efficiency” on page 14

• “New Diagn osti c Controls to Detect Precision Loss in Fixed-Point

Constants” on page 14

Version 6.2 (R2009b) Simulink®Fixed Point™ Software

• “Synchronized Zooming for Fixed-Point Tool Time Series Difference Plot”

on page 14

• “Changes in Text and Visibility of Dialog Box Prompts for Easier Use with

Fixed-Point Advisor and Fixed-Point Tool” on page 15

• “New and Enhanced Demos” on page 17

• “Function Being R emo ved in a Future Version” on page 17

Discrete Transfer Functio n Block Supports Fixed-Point Intrinsically

The Dis crete Transfer Fcn block now accepts and outputs fixed-point signals.

New PID Controller Blocks Support Fixed-Point Intrinsically

In discrete-time, the new PID Controller and PID Controller (2 DOF) blocks accept real signals of any numeric data type supported by Simulink software, including fixed-point data types.

Rapid Accelerator Mode Now S upports All Fixed-Point Word Lengths for Parameters

Rapid Accelerator mode now supports fixed-point parameters up to 128 bits. To learn more about fixed-point considerations when accelerating your Simulink models, see “Accelerator and Rapid Accelerator Mode Data Type Considerations” in the Simulink User’s Guide.

Lookup Table (n-D) Block Supports Parameter Data Types Different from Signal Data Types

The Lookup Table (n-D) block supports breakpoint data types that differ from input data types. This enhancement provides these benefits:

• Lower memory requirement for storing breakpoint data that uses a smaller

type than the input signal

• Sharing of prescaled breakpoint data between two Lookup Table (n-D)

blocks with different input data types

Simulink®Fixed Point™ Release Notes

• Sharing of custom storage breakp oint data in Real-Time Work sh op

generated code for blocks with different i nput data types

The Lookup Table (n-D) block supports table data types that differ from output data types. This enhancement provides these benefits:

• Lower memory requirement for storing table data that uses a smaller type

than the output signal

• Sharing of prescaled table data between two Lookup Table (n-D) blocks

with different output data types

• Sharing of custom storage table data in Real-Time Workshop generated

code for blocks with different output data types

The Lookup Table (n-D) block also supports separate data type specification for intermediate results. This enhancement enables use of a higher precision for internal computations than for table data or output data.

Reduced Memory Use and More Efficient Code for Evenly-Spaced Breakpoints in Prelookup and Lookup Table (n-D) Blocks

For the Prelookup and Lookup Table (n-D) blocks, Real-Time Workshop generated code now stores only the first breakpoint, spacing, and number of breakpoints when:

• The breakpoint data is n ot tunable.

• The index search method is

This enhancement reduces memory use and provides faster code execution. Previously, the code stored all breakpoint values in a set, regardless of the tunability or spacing of the breakpoints.

The following enhancements also provide more efficient code for the two blocks:

Evenly spaced points.

Version 6.2 (R2009b) Simulink®Fixed Point™ Software

Block

Lookup Table (n-D) Removal of unnecessary bit shifts for

Prelookup and Lookup Table (n-D) Use of simple division instead of

Enhancement for Code Efficiency

calculating the fraction

computationally-expensive function calls for calculating the index and fraction

Math Function Block Enhancem ents for Real-Time Workshop Code Generation

The Math Function b lock now supports Real-Time Workshop code generation for fixed-point data types with fractional slope and non ze ro bias for the

magnitude^2, square,andreci pro cal functions.

Improved Fixed-Point Advisor Workflow

In R2009b, the new Fixed-Point Advisor workflow helps you convert your floating-point Simulink model to a fixed-point model more quickly and efficiently. You can now complete your first iteration through the conversion process without accepting all the recommendations. The new workflow ensures that you convert the entire model b efore preparing the model for code generation. For more information, see “Tutorial: Converting a Model from Floating- to Fixed-Point” and “Fixed-Point Advisor Reference” in the Simulink Fixed Point User’s Guide.

New Optimization Option to Allow Integer Division toHandleNetSlopesthatareReciprocalsofIntegers

R2009b introduces a new optimization parameter, Use integer division to handle net slopes that are reciprocals of integers.Whenachange

of fixed-point slope is not a power of two, net slope correction is necessary. Normally, net slope correction use s an integer multiplication followed by shifts. Enabling this new optimization replaces the multiplication and shifts with an integer division under certain sim plicity and accuracy conditions. For more information, see “Use integer division to handle net slopes that are reciprocals of integers” in the Simulink Graphical User Interface.

Simulink®Fixed Point™ Release Notes

Enhanced Model Advisor Check Identifies Opportunities to Improve Code Efficiency

The Model Advisor Identify questionable fixed-point operations check can:

• ProvideadviceonwhentousethenewUse integer division to handle

netslopesthatarereciprocalsofintegersoptimization parameter

For more information, see “Use integer division to h andle net slopes that are reciprocals of integers” in the Simulink Graphical User Interface.

• Identify opportunities to improve efficiency of generated code for Lookup

Table(n-D)blocksinthefollowingcases:

Breakpoint Spacing Index Search Method

Uneven Not Evenly spaced points

Even, power of 2

Not

Evenly spaced points

Even, not power of 2

For more information, see “Identify questionable fixed-point operations” in the Real-Time Workshop Reference.

Not Evenly spaced points

Evenly spaced points

New Diagnostic Controls to Detect Precision Loss in Fixed-Point Constants

You can now enable the detection of precision loss in net slope and net bias correction. If you enable these diagnostics, the software alerts you when precision loss occurs. It also provides information about the original fixed-point constant value and the error introduced due to quantization or saturation. For more information, see “Detect underflow”, “D etect overflow”, and “Detect precision loss” in the Simulink Graphical User Interface.

Synchronized Zooming for Fixed-Point Tool Time Series Difference Plot

The Fixed-Point Tool now p rovides synchronized zooming for the Time Series Difference (A-R) plot. By default, zooming on either the

Active and

Version 6.2 (R2009b) Simulink®Fixed Point™ Software

Reference plot or the Difference plot now zooms both plots. For more

information, see “Plot Interface” in the Simulink Reference.

Changes in Text and Vis ibility of Dialog Box Prompts for Easier Use with F ixed-Point Advisor and Fixed-Point Tool

The Lock output scaling against changes by the autoscaling tool check box is now Lock output data type setting against changes by the fixed-point tools. Previously, this check box was visible only if you entered an expression or a fixed-point data type for the output, such as

fixdt(1,16,0). This check box is now visible for any output data type

specification. This enhancement enables you to lock the current data type settings on the dialog box against changes that the Fixed-Point Advisor or Fixed-Point Tool chooses.

Which blocks are enhanced?

This enhancement applies to the following blocks:

• Abs

• Constant

• Data Store Memory

• Data Type Conversion

• Difference

• Discrete Derivative

• Discrete-Time Integrator

• Divide

• Dot Product

• Fixed-Point State-Space

• Gain

• Inport

• Lookup Table

Simulink®Fixed Point™ Release Notes

• Lookup Table (2-D)

• Lookup Table Dynamic

• Math Function

• MinMax

• Multiport Switch

• Outport

• Prelookup

• Product

• Product of Elements

• Relay

• Repeating Sequence Interpolated

• Repeating Sequence Stair

• Saturation

• Saturation Dynamic

• Signal Specification

• Switch

The Lock scaling against changes by the autoscaling tool check box is now Lock data type settings against changes by the fixed-point tools. Previously, this check box was visible only if you entered an expression or a fixed-point data type, such as

fixdt(1,16,0). This check box is now

visible for any data type specification. This enhancement enables you to lock the current data type settings on the dialog box against changes that the Fixed-Point Advisor or Fixed-Point Tool chooses.

Which blocks are enhanced?

This enhancement applies to the following blocks:

• Discrete FIR Filter

• Interpolation Using Prelookup

Version 6.2 (R2009b) Simulink®Fixed Point™ Software

• Lookup Table (n-D)

• Sum

• Sum of Elements

New and Enhanced Demos

Thefollowingdemoshavebeenadded:

Demo...

Fault-tolerant Fuel Control System

Shows How You Can...

Perform a floating-point and a fixed-point simulation of a fuel rate control system designed using Simulink and Stateflow.

Function Being Removed in a Future Version

This function will be removed in a future version of Simulink Fixed Point software.

Function Name

fixpt_instrument_purge

What Happens When You Use This Function?

Still works in R2009b

Compatibility Considerations

None

Simulink®Fixed Point™ Release Notes

Version 6.1 (R2009a) Simulink Fixed Point Software

This table summarizes what’s new in Version 6.1 (R2009a):

New Features and Changes

Yes Details below

Version Compatibility Considerations

Yes—Details labeled as Compatibility Considerations, below. Se e also Summary.

New features and changes introduced in this version are

• “Discrete Filter Block Supports Fixed-Point Data Types” on page 19

• “Prelookup and Interpolation Usin g Prelookup Blocks Support Parameter

DataTypesThatAreDifferentfromSignalDataTypes”onpage19

• “Lookup Table (n-D) and Interpolation Using Prelookup Blocks Pe rfo rm

Efficient Fixed-Point Interpolations” on page 20

• “Autoscaling for Simulink Signal Objects is Supported by Fixed-Point

Advisor and Fixed-Point Tool” on page 20

• “Rounding Modes Convergent and Round Added to Multiple Blocks” on

page 21

• “Simplest Rounding Mode Added to Multiple Blocks” on page 21

Fixed Bugs an d Known Problems

Bug Reports Includes fixes

Related Documentation at Web Site

Printable Release Notes: PDF

Current product documentation

• “Multiword Generated Code Enhancements” on page 21

• “Fixed-Point Tool Provides the Ability to Narrow Down Displayed Results

Using Filtering Controls” on page 22

• “MinMax Block Performs More Efficient and Accurate Comparison

Operations” on page 22

• “New and Enhanced Demos” on page 22

Version 6.1 (R2009a) Simulink®Fixed Point™ Software

Discrete Filter

The Discrete Fil types.

In this release Filter block:

• Improved nume

reducing the

• Support for v

• Support for

• AnewInitia

• AnewLeadi

more effic denominat

Prelooku Support P from Sig

The Prel data typ

ookup block supports breakpoint data types that differ from input

es. This enhancement provides these benefits:

ter block now offers support for fixed-point and integer data

, the following enhancements have been made to the Discrete

number of divide operations in the filter to at m ost one

ector and matrix inputs

inputs with mixed complexity

l states parameter allows you to enter n on zero initi al states

ng denominator coefficient equals 1 parameter provides a

ient implementation by eliminating all divides when the leading

or coefficient is one

p and Interpolation Using Prelookup Blocks

arameter Data Types That Are Different

nal Data Types

Block Supports Fixed-Point Data Types

rics and run-time performance of outputs and states by

• Enable

smalle

• Enabl

block

• Enabl

gene

The I from

• Ena

sma

s lower memory requirement for storing breakpoint data that uses a

r type than the input signal

es sharing of prescaled breakpoint data between two Prelookup

s with different input data types

es sharing of custom storage breakpoint data in Real-Time Workshop

rated code for blocks with different input data types

nterpolation Using Prelookup block supports table data types that differ output data types. This enhancement provides these benefits:

bles lower memory requirement for storing table data that uses a ller type than the output signal

Simulink®Fixed Point™ Release Notes

• Enables sharing of prescaled table data between two Interpolation Using

Prelookup blocks with different output data types

• Enables sharing of custom storage table data in Real-Time Workshop

generated code for blocks with different output data types

The Interpolation Using Prelookup block also supports separate data type specification for intermediate resu lts. This enhancement enables use of a different precision for internal computations than for table data or output data.

Lookup Table (n-D) and Interpolation Using Prelookup Blocks Perform Efficient Fixed-Point Interpolations

Whenever possible, Lookup Table (n-D) and Interpolation Using Prelookup blocks use a faster overflow-free subtraction algorithm for fixed-point interpolation. To achieve this efficiency, the blocks use a data type of larger containersizetoperformtheoverflow-free subtraction, instead of using control-flow branches as in previous releases. Also, Real-Time Workshop generated code for fixed-point interpolation is now smaller.

Compatibility Considerations

Duetothechangeintheoverflow-freesubtraction algorithm, fixed-point interpolation in Lookup Table (n-D) and Interpolation Using Prelookup blocks might, in a few cases, introduce different rounding results from previous releases. Both simulation and code generation use the new overflow-free algorithm, so they have the same rounding behavior and provide bit-true consistency.

Autoscaling for Simulink Signal Objects is Supported by Fixed-Point Advisor and Fixed-Point Tool

In this release, Fixed-Point Advisor and Fixed-Point Tool can propo se new scaling for Simulink signal objects in the base or model workspace. If you accept the proposed scaling, Fixed-Point Advisor or Fixed-Point Tool will apply the new scaling to the Simulink signal objects automatically.

Version 6.1 (R2009a) Simulink®Fixed Point™ Software

For more information, see “Automatic Scaling Tools” in the Simulink Fixed Point documentation.

Rounding Modes Convergent and Round Added to Multiple Blocks

Rounding modes Convergent and Round were added to multiple Simulink, Communications Blockset™, Signal Processing Blockset™ , and Video and Image Processing Blockset™ blocks. The introduction of these rounding modes allows numerical agreement with advanced embedded hardware and MATLAB.

For more information, see “Rounding Mode: Convergent” and “Rounding Mode: Round” in the Simulink Fixed Point documentation.

Compatibility Considerations

If you use an earlier version of Simulink to open a model that uses the

Convergent or Round rounding modes, the software automatically changes

theroundingmodeto

Nearest.

Simplest Rounding Mode Added to M ultiple Blocks

The Simplest rounding mode was added to multiple Simulink, Communications Blockset, Signal Processing Blockset, and Video and Image Processing Blockset blocks. Support for this rounding mode maximizes efficiency for blocks handling mixtures of floating point an d fixed point.

For more information, see “Rounding Mode: Simplest” in the Simulink Fixed Point documentation.

Multiword Generated Code Enhancements

More Efficient Reuse of Temporary Variables

A reduction in the number of temporary variables and reorganization of function signatures provide more efficient multiword cod e. This results in faster execution speeds and reduced memory usage. In addition, the new code compiles faster and is easier to ins pect manually.

Simulink®Fixed Point™ Release Notes

Support for Real-Time Workshop Embedded Coder Code Control Features

More Real-Time Workshop Embedded Coder code control features n ow apply to multiwo rd functions. These features provide the ability to customize your code, for example, you can customize the code style.

Fixed-Point Tool Provides the Ability to Narrow Down Displayed Results Using Filtering Controls

In this release, the Fixed-Point Tool provides a results filter in the toolbar which specifies the type of results to display. You can use the filter to focus on the types of results that you are interested in at different stages of the autoscaling workflow. Filter options include:

• All results

• Signal Logging results

• Min/Max results

• Overflows

• Conflicts with proposed data types

• Groups that must share the same data type

For more information, see

fxptdlg in the Simulink Reference.

MinMax Block Performs More Efficient and Accurate Comparison Operations

For multiple inputs with mixed floating-point and fixed-point data types, the MinMax block selects an appropriate data type for performing comparison operations, instead of using the output data type for all comparisons, as in previous releases. This enhancement provides these benefits:

• Faster comparison operations, with fewer fixed-point overflows

• Smaller size of Real-Time Workshop generatedcodefortheMinMaxblock

New and Enhanced Demos

The following demo has been added:

Version 6.1 (R2009a) Simulink®Fixed Point™ Software

Demo...

Multiword Code Generation

Shows How You Can...

Use Real-Time Workshop to convert wide integer and fixed-point operations to multiword C code.

Simulink®Fixed Point™ Release Notes

Version 6.0 (R2008b) Simulink Fixed Point Software

This table summarizes what’s new in Version 6.0 (R2008b):

New Features and Changes

Yes Details below

Version Compatibility Considerations

Yes—Details labeled as Compatibility Considerations, below. Se e also Summary.

New features and changes introduced in this version are

• “Limit of Bits Increased with Embedded MATLAB Function Block” on

page 25

• “Limit of Bits Increased with Accelerated Simulation” on page 25

• “Limit of Bits Increased with Code Generation” on page 25

• “Fixed-Point Advisor Enhanced” on page 25

• “Generated Code Enhancement” on page 25

• “Parameter to Lock Output Scaling Added to Six Simulink Blocks” on

page 26

• ““What’s This?” Context-Sensitive Help Available for Fixed-Point Tool”

on page 26

Fixed Bugs an d Known Problems

Bug Reports Includes fixes

Related Documentation at Web Site

• “Enhanced Support for Stateflow Charts in the Fixed-Point Tool” on page 27

• “Cell Array No Longer Created When Data Logging Is Enabled in the

Fixed-PointTool”onpage27

• “Name Change for Associated Parameters” on page 28

• “Functions Being Removed in a Future Version” on page 29

Version 6.0 (R2008b) Simulink®Fixed Point™ Software

Limit of Bits I ncreased with Embedded MATLAB Function Block

Replacement of Embedded MATLAB Function block limit of 32 bits with standard block limit of 128 bits.

Limit of Bits Increased with Accelerated Simulation

Replacement of accelerated simulation limit of 32 bits with norm al simulation limit of 128 bits.

Limit of Bits Increased with Code Generation

Replacement of code-generation limit of 32 bits with simulation limit of 128 bits.

Fixed-Point Advisor Enhanced

In R2008b, the Fixed-Point Advisor is enhanced with:

• Improved usability including more descriptive results and intuitive table

formatting.

• Improved analysis such as the ability to regenerate si mulation data in

Create simulation reference data.

• Direct links from the Fixed-Point Advisor to the Fixed-Point Tool for

improved analysis after the conversion is complete.

• A system selector that allows you to choose the system level from which to

start the Fixed-Point Advisor.

For more information, see “Fixed-Point Advisor” in the Simu link Fixed Point documentation.

Generated Code Enhancement

In R2008b, code generation is enhanced to remove excess saturation logic code, reducing RAM and ROM, improving code efficiency.

Simulink®Fixed Point™ Release Notes

Parameter to Loc Simulink Blocks

For the followin lock scaling of

• Constant

• Data Store Mem

• Inport

• Outport

• Relay

• Signal Spec

For more in

Simulink R

“What’s T Fixed-Po

R2008b i that app detaile find th

ntroduces “What’s This?” context-sensitive help for parameters

ear in the Fixed-Point Tool. This feature provides quick access to a d description of the parameters, saving you the time it would take to e information in the Help browser.

g Simulink blocks, the dialog box now displays a parameter to

outputs against changes by the autoscaling tool:

ory

ification

formation about these blocks, see “Block Reference” in the

eference.

his?” Context-Sensitive Help Available for

int Tool

k Output Scaling Added to Six

To use t

1 Place

2 Right-click. A What’s This? context menu appears.

he "What’s This?" help:

your cursor over the label of a parameter.

For example, the following figure shows the What’s This? context menu appearing after right-clicking the Percent safety margin (e.g. 10 for 10%) parameter.

Version 6.0 (R2008b) Simulink®Fixed Point™ Software

3 Click What’s This? A context-sensitive help window appears showing a

description of the parameter.

Enhanced Support for Stateflow Charts in the Fixed-Point Tool

You can now control the signal logging of a Simulink subsystem placed inside a Stateflow chart from the subsystem parent node.

Cell Array No Longer Created When Data Logging Is Enabled in the Fixed-Point Tool

In R2008b, the cell array FixPtSimRanges is no longer created automatically in the MATLAB workspace after simulation of a model where data logging is enabled in the Fixed-Point Tool.

Compatibility Considerations

Previously, simulating a model with logging enabled in the Fixed-Point Tool would store maximum values, minimum values, and overflow data in the workspace variable However, you can still view this information in one of these ways:

FixPtSimRanges. In R2008b, this behavior has changed.

• In the Contents pane of the Fixed-Point Tool

• In the MATLAB Command Window by calling the function

showfixptsimranges

If...

Youdonotusescriptstomanipulate the data stored in

You use scripts to manipulate the data stored in

For example, suppose you have a script as follows:

global FixPtSimRanges outputMaxForBlock1 = FixPtSimRanges{1}.MaxValue; outputMinForBlock1 = FixPtSimRanges{1}.MinValue;

FixPtSimRanges

Then...

Youhavenobackward incompatibility

Youmustaddafunctioncallto

showfixptsimranges in your scripts

Simulink®Fixed Point™ Release Notes

pathForBlock1 = FixPtSimRanges{1}.Path;

In R2008b, you must add a line to the script:

global FixPtSimRanges showfixptsimranges('quiet'); outputMaxForBlock1 = FixPtSimRanges{1}.MaxValue; outputMinForBlock1 = FixPtSimRanges{1}.MinValue; pathForBlock1 = FixPtSimRanges{1}.Path;

For more information about showfixptsimranges,seeshowfixptsimranges in the Simulink Fixed Point Function Reference.

Name Change for Associated Parameters

The Associated parameters in the Autoscale Information dialog box are now Model-Required parameters. Specifically, the Shared Associated

Parameter Initial Value Max parameter is now Shared Model-Required Maximum and Associated Parameter Initial Value Max is Model-Required Maximum. The names of the minimum values have

changed in the same manner. For more information, see “Examining Results to Resolve Conflicts” in the Simulink Fixed Poi nt documentation.

Version 6.0 (R2008b) Simulink®Fixed Point™ Software

Functions Being

These functions software.

Function Name

showfixptsimerrors

showfixp

will be removed in a future version of Simulink Fixed Point

tsimranges

Removed in a Future Version

What Happens When You Use This Function?

Still works in R2008b

Still wor

ks in R2008b

Compatibility Considerations

Use the Fixed Tool to view o data for fixe simulation “Fixed-Poi the Simuli

Point User

Use the Fixed-Point Tool to view maximum values, minimum values, and overflow data. (Se e “Fixed-Point Tool” in the Simulink

Fixed Point User’s Guide.)

s. (See

nt Tool” in

nk Fixed

’s Guide.)

-Point

verflow

d-point

Simulink®Fixed Point™ Release Notes

Version 5.6.1 (R2008a+) Simulink Fixed Point Software

This table summarizes what’s new in Version 5.6.1 (R2008a+):

New Features and Changes

No No Bug Reports

Version Compatibility Considerations

Fixed Bugs an d Known Problems

Includes fixes

Related Documentation at Web Site

Version 5.6 (R2008a) Simulink®Fixed Point™ Software

Version 5.6 (R2008a) Simulink Fixed Point Software

This table summarizes what’s new in Version 5.6 (R2008a):

New Features and Changes

Yes Details below

Version Compatibility Considerations

No Bug Reports

New features and changes introduced in this version are

• “Enhanced Fixed-Point Tool” on page 31

• “New Fixed-Point Advisor” on page 32

• “Fixed-Point Enhancements in Simulink Blocks” on page 32

Fixed Bugs an d Known Problems

Includes fixes

Related Documentation at Web Site

Enhanced Fixed-Point Tool

This release introduces the following enhancements to the Fixed-Point Tool:

• In previous releases, you access the Fixed-Point Tool by selecting

Fixed-Point Settings from the Simulink Tools menu. To display the Fixed-Point Tool in this release, from a model’s Tools menu, select Fixed-Point > Fixed-Point Tool. See “Opening the Fixed-Point Tool” for more information.

• In this release, the Fixed-Point Tool incorporates design minimum and

maximum values in its automatic scaling procedure. Typically, you use a model object’s Output minimum and Output maximum parameters to specify this design range. The tool’s Contents pane displays these values in new columns titled DesignMin and DesignMax.See“Proposing Scaling” for more information.

• The Fixed-Point Tool provides a new Autoscale Information dialog box. For

each model object, this dialog summarizes data type details and explains the tools scaling proposal. See “Examining Results to Resolve Conflicts” for more information.

Simulink®Fixed Point™ Release Notes

See “Fixed-Point Tool” in the Simulink Fixed Point User’s Guide for more information about working with the tool.

New Fixed-Point Advisor

The Fixed-Point Advisor is a new interactive tool you can use to facilitate converting a floating-point model or subsystem to an equivalent fixed-point representation. You can use the Fixed-Point Advisor to prepare a model for conversion and obtain an initial scaling to use as the starting point for refinement and exploration inside the Fixed-Point To ol. For more information, see “Fixed-Point Advisor” in the Simulink Fixed Point documentation.

Fixed-Point Enhancements in Simulink Blocks

This section describes enhancements to fixed-point data type support in Simulink blocks.

Lookup Table (n-D) Block

The Lookup Table (n-D) block now supports fixed-point data types.

Sum Block

The Sum block provides a new parameter for specifying the data type of its accumulator. You can now specify its accumulator data type as any data type that Simulink supports, including fixed-point data types.

Version 5.5.1 (R2007b+) Simulink®Fixed Point™ Software

Version 5.5.1 (R2007b+) Simulink Fixed Point Software

This table summarizes what’s new in Version 5.5.1 (R2007b+):

New Features and Changes

No No Bug Reports

Version Compatibility Considerations

Fixed Bugs an d Known Problems

Includes fixes

Related Documentation at Web Site

Simulink®Fixed Point™ Release Notes

Version 5.5 (R2007b) Simulink Fixed Point Software

This table summarizes what’s new in Version 5.5 (R2007b):

New Features and Changes

Yes Details below

Version Compatibility Considerations

Yes—Details labeled as Compatibility Considerations, below. Se e also Summary.

New features and changes introduced in this version are

• “New Signal Logging Options in the Fixed-Point Tool” on page 34

• “Add, Subtract, and Sum Blocks Use an Accumulator Data Type” on page 34

• “Cast O perations with Net Bias Use an Intermediate Data Type” on page 35

• “Non-Matrix-Wise Parameter Scaling Modes Removed” on page 35

Fixed Bugs an d Known Problems

Bug Reports Includes fixes

Related Documentation at Web Site

New Signal Logging Options in the Fixed-Point Tool

In this release, the Fixed-Point Tool includes new options that provide batch control of signal logging for models and subsystems. These options allow you to enable or disable logging for m ultiple signals simultaneously, based on the location of signals in a model hierarchy and whether the signals have names. For m ore information, see the documentation for the Simulink Reference.

fxptdlg function in the

Add, Subtract, and Sum Blocks U se an Accumulator Data Type

In previous releases, the Add, Subtract, and Sum blocks used a user-specified output data type to perform all operations. This behavior might have caused precision loss and saturation during intermediate operations, producing unexpected results. In this release, these blocks use an ideal accumulator data type w hen performing intermediate operations. Consequently, the

Version 5.5 (R2007b) Simulink®Fixed Point™ Software

Add, Subtract, and Sum blocks now produce more precise results, and the Real-Time Workshop product generates less saturation code for them.

Cast Operations with Net Bias Use an Intermediate Data Type

Data type conversions w ith net bias involve an intermediate addition operation. In previous releases, blocks that perform such casts used the output data type’s container to compute the addition operation. This behavior might have caused extra saturation, producing unexpected results. In this release, data type conversions can use an ideal data type when perfo r m in g all intermediate operations. By reducing or eliminating intermediate saturations, cast operations now produce more accurate results, and the Real-Time Workshop product generates more efficient code for them.

Non-Matrix-Wise Parameter Scaling Modes Removed

In previous releases, the Gain and Weighted Moving Average blocks contained aparameternamedParameter scaling mode whose options included the following scaling modes:

•

Best Precision: Element-wise

• Best Precision: Row-wise

• Best Precision: Column-wise

• Best Precision: Matrix-wise

In this release, only the Best Precision: Matrix-wise setting is available, and it is now simply named pane of the Gain or Weighted Moving Average block parameter dialog box, use the Data Type Assistant to specify

Best precision.OntheParameter Attributes

Best precision for the Scaling control.

Compatibility Considerations

Pre-R2007b models that contain Gain or Weighted Moving Average blocks whose Parameter scaling mode option specifies a non-matrix-wise setting will be updated automatically when loaded in R2007b. That is, the Simulink software will change non-matrix-wise settings to

Best precision, which now

Simulink®Fixed Point™ Release Notes

represents matrix-w ise-best-precision scaling. Consequently, affected blocks might g enerate results that differ from those obtained in previous releases.

Version 5.4.1 (R2007a+) Simulink®Fixed Point™ Software

Version 5.4.1 (R2007a+) Simulink Fixed Point Software

This table summarizes what’s new in Version 5.4.1 (R2007a+):

New Features and Changes

No No Bug Reports

Version Compatibility Considerations

Fixed Bugs an d Known Problems

Includes fixes

Related Documentation at Web Site

Simulink®Fixed Point™ Release Notes

Version 5.4 (R2007a) Simulink Fixed Point Software

This table summarizes what’s new in Version 5.4 (R2007a):

New Features and Changes

Yes Details below

Version Compatibility Considerations

No Bug Reports

New features and changes introduced in this version are

Fixed Bugs an d Known Problems

Includes fixes

Related Documentation at Web Site

Fixed-Point Tool

The Fixed-Point Tool is a new interactive graphical environment for analyzing and scaling fixed-point systems, which replaces the Fixed-Point Settings interface in previous releases. To access the tool, from the Simulink model editor Tools menu, select Fixed-Point Settings. Alternatively, you use the

fxptdlg function to access the tool. See “Fixed-Point Tool” in Simulink

Fixed Point User’s Guide for a tutorial that demonstrates how to use the

new interface.

Version 5.3 (R2006b) Simulink®Fixed Point™ Software

Version 5.3 (R2006b) Simulink Fixed Point Software

This table summarizes what’s new in Version 5.3 (R2006b):

New Features and Changes

Yes Details below

Version Compatibility Considerations

No Bug Reports No

New features and changes introduced in this version are

Fixed Bugs an d Known Problems

Related Documentation at Web Site

Fixed-Point Enhancements in Simulink Blocks

This section describes enhancements to fixed-point data type support in Simulink blocks.

Math Function Block

The sqrt operation in the Math Function block supports fixed-point data types.

New Lookup Table Blocks

The new Prelookup and Interpolation Using Prelookup blocks support fixed-point data types.

Simulink®Fixed Point™ Release Notes

Version 5.2.1 (R2006a+) Simulink Fixed Point Software

This table summarizes what’s new in Version 5.2.1 (R2006a+):

New Features and Changes

No No Bug Reports

Version Compatibility Considerations

Fixed Bugs an d Known Problems

at Web site

Related Documentation at Web Site

Version 5.2 (R2006a) Simulink®Fixed Point™ Software

Version 5.2 (R2006a) Simulink Fixed Point Software

This table summarizes what’s new in Version 5.2 (R2006a):

New Features and Changes

Yes Details below

Version Compatibility Considerations

No Bug Reports

New features and changes introduced in this version are

• “Fixed-Point Block Parameters Supported” on page 41

• “’Simplest’ Rounding Mode” on page 41

Fixed Bugs an d Known Problems

at Web site

Related Documentation at Web Site

Fixed-Point Block Parameters Supported

This release allows you to specify fixed-point numbers as the values of Simulink block parameters. In particular, you can specify fixed-point data types in S imulink block parameter di al og boxes and as values of th e data type property of Fixed-Point Parameters” for more information.

Simulink.Parameter objects. See “Configuring Blocks with

’Simplest’ Rounding Mode

AnewSimplest rou nding mode is available for the Round integer calculations toward parameter of some fixed-point Simulink blocks. This

rounding mode attempts to reduce or eliminate the need for extra rounding code in your genera te d code. The available for the following blocks:

Simplest rounding mode is currently

• Data Type Conversion

• Product

• Lookup Table

• Lookup Table (2-D)

• Lookup Table Dynamic

Simulink®Fixed Point™ Release Notes

For more inform ation, refer to “Rounding Mode: Simplest” in the product documentation.

Version 5.0 (R14) Simulink®Fixed Point™ Software

Version 5.0 (R14) Simulink Fixed Point Software

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

New Features and Changes

Yes Details below

Version Compatibility Considerations

Yes—Details labeled as Compatibility Considerations, below. Se e also Summary.

New features and changes introduced in this version are

• “Product Restructuring” on page 43

• “Fixed-Point Blocks Fully Integrated into Simulink Software” on page 44

• “API for User-Written Fixed-Point S-Functions” on page 52

• “Fixed-Point Advisor” on page 52

• “Arithmetic with Non-Zero Bias Fully Supported” on page 52

• “Generated Code for Lookup Tables Uses Less ROM” on page 53

• “Functions Moved to Simulink Software” on page 53

• “Obsolete Functions” on page 54

• “Major Bug Fixes” on p age 54

Fixed Bugs an d Known Problems

Yes Details

Related Documentation at Web Site

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.

Simulink®Fixed Point™ Release Notes

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 S im ulink 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 fo llowing table lists all of the blocks in the Fixed-Point B lockset 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

Abs

Accumulator Calculus

Accumulator Resettable

Accumulator Resettable Limited

Add

Bit Clear

Former Fixed-Point Blockset Library Simulink Block Simulink Library

Math

Calculus

Math

Bits

Abs Math O perations

Discrete-Time Integrator

Add Math O perations

Bit Clear

Discrete

Logic and Bit Operations

Version 5.0 (R14) Simulink®Fixed Point™ Software

Former Fixed-Point Blockset Block

Bit Set

Former Fixed-Point Blockset Library Simulink Block Simulink Library

Bits

Bit Set

Logic and Bit Operations

Bitwise O perator

Bits

Bitwise O perator

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

Conversion Inhe rited

Data Type

Data Type Conversion Signal Attributes

Data Type Conversion

Signal Attributes

Inherited

Cosine

Lookup

Cosine

Counter Free Sources Counter

Lookup Tables

Sources

Free-Running

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

Simulink®Fixed Point™ Release Notes

Former Fixed-Point Blockset Block

Decrement Time To Zero

Former Fixed-Point Blockset Library Simulink Block Simulink Library

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

Detect Change

Calculus

Edge Detect

Discrete Derivative Discrete

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

Detect Increase

Edge Detect Detect Fall

Nonpositive

Edge Detect

Detect Increase

Logic and Bit Operations

Detect Rise Nonnegative

Edge Detect Detect Rise

Nonnegative

Detect Rise Positive Edge Detect Detect Rise Positive Logic and Bit

Difference Calculus Difference

Divide Math Divide

Dot Product Math Dot Product

Filter Direct Form I Filters This block is obsolete.

Filter Direct Form I

Filters This block is obsolete.

Time Varying

Logic and Bit Operations

Operations

Discrete

Math Operations

Version 5.0 (R14) Simulink®Fixed Point™ Software

Former Fixed-Point Blockset Block

Former Fixed-Point Blockset Library Simulink Block Simulink Library

Filter Direct Form II Filters

Filter Direct Form II

Filters

Time Varying

Filter First Order

Filters

Filter Lead or Lag Filters

Filter R eal Zero Filters

FIR

Gain

Gateway In

Gateway In Inherited

Filters Weighted Moving

Math

Data Type

Transfer Fcn Direct Form II

Additional Math & Discrete / Additional Discrete

Transfer Fcn Direct Form II Time Varying

Additional Math & Discrete / Additional Discrete

Transfer Fcn First

Discrete

Order

Transfer Fcn Lead or

Discrete

Lag

Transfer Fcn Real

Discrete

Zero

Discrete

Average

Gain Math Operations

Data Type Conversion Signal Attributes

Data Type Conversion

Signal Attributes

Inherited

Gateway Out

Data Type

Data Type Conversion Signal Attributes

Increment Real World Math Increment Real World

Increment Stored Integer

Index Vector

Integer Delay

Math

Select

Delays & Holds

Increment Stored Integer

Index Vector

Integer Delay Discrete

Additional Math & Discrete / Additional Math: Increment Decrement

Signal Routing

Simulink®Fixed Point™ Release Notes

Former Fixed-Point Blockset Block

Integrator Backward

Integrator Backward Resettable

Integrator Backward Resettable Limited

Integrator Forward

Integrator Forward Resettable

Integrator Forward Resettable Limited

Integrator Trapezoidal

Integrator Trapezoidal Resettable

Integrator Trapezoidal Resettable Limited

Former Fixed-Point Blockset Library Simulink Block Simulink Library

Calculus

Discrete-Time

Discrete

Integrator

Calculus

Discrete-Time

Discrete

Integrator

Calculus

Discrete-Time

Discrete

Integrator

Calculus

Discrete-Time

Discrete

Integrator

Calculus

Discrete-Time

Discrete

Integrator

Calculus

Discrete-Time

Discrete

Integrator

Calculus

Discrete-Time

Discrete

Integrator

Calculus

Discrete-Time

Discrete

Integrator

Calculus

Discrete-Time

Discrete

Integrator

Interval Test

Logic & Comparison

Interval Test Logic and Bit

Operations

Interval Test Dynamic

Logic & Comparison

Interval Test Dynamic Logic and Bit

Operations

Logical O perator Logic & Comparison Logical Operator

Logic and Bit Operations

Lookup Table Lookup Lookup Table Lookup Tables

Lookup Table Dynamic

Lookup Table (2-D)

Lookup Lookup Table

Dynamic

Lookup

Lookup Table (2-D)

Lookup Tables

Version 5.0 (R14) Simulink®Fixed Point™ Software

Former Fixed-Point Blockset Block

Matrix Gain

MinMax Math MinMax

MinMax Running Resettable

Multiply Math Product

Multiply Matrix Math Product

Former Fixed-Point Blockset Library Simulink Block Simulink Library

Math

Gain Math Operations

Math Operations

Math MinMax Running

Math Operations

Resettable

Math Operations

Multi-Port Switch Select Multiport Switch Signal Routing

Product Math Product

Product of Elements

Math

Product of Elements Math Operations

Math Operations

Inverted

Rate Limiter Nonlinear Rate Limiter Discontinuities

Rate Limiter Dynamic Nonlinear Rate Limiter Dynamic Discontinuities

Relational Operator Log ic & Com paris on Relational Operator

Logic and Bit Operations

Relay Nonlinear Relay Discontinuities

Repeating Sequence Interpolated

Repeating Sequence Stair

Sources Repeating Sequence

Interpolated

Sources Repeating Sequence

Stair

Sample Rate Probe Calculus Weighted Sample

Time

Sample Time Add Calculus Weighted Sample

Time

Sample Time Divide Calculus Weighted Sample

Time

Sample Time Multiply Calculus Weighted Sam ple

Time

Sources

Signal Attributes

Simulink®Fixed Point™ Release Notes

Former Fixed-Point Blockset Block

Former Fixed-Point Blockset Library Simulink Block Simulink Library

Sample Time Probe Calculus Weighted Sample

Time

Sample Time Subtract Calculus Weighted Sample

Time

Saturation

Saturation Dynamic

Scaling Strip

Nonlinear

Data Type

Saturation

Saturation Dynamic

Data Type Scaling Strip

Shift Arithmetic

Sign

Sine

State-Space

Bits

Nonlinear

Lookup

Shift Arithmetic

Sign Math Operations

Sine

Filters Fixed-P oint

State-Space

Subtract

Sum

Math

Subtract Math Operations

Sum Math Operations

Signal Attributes

Discontinuities

Signal Attributes

Logic and Bit Operations

Lookup Tables

Additional Math & Discrete / Additional Discrete

Sum of Elements

Math

Sum of Elements Math Operations

Negated

Switch Select Switch Signal Routing

Tapped Delay

Delays & Holds

Unary Minus Math Unary Minus

Unit Delay

Unit Delay Enabled

Delays & Holds

Tapped Delay Discrete

Math Operations

Unit Delay Discrete

Unit Delay Enabled

Additional Math & Discrete / Additional Discrete

Version 5.0 (R14) Simulink®Fixed Point™ Software

Former Fixed-Point Blockset Block

Unit Delay Enabled External IC

Unit Delay Enabled Resettable

Unit Delay Enabled Resettable External IC

Unit Delay External IC

Unit Delay Resettable

Unit Delay Resettable External IC

Unit Delay With Preview Enabled

Former Fixed-Point Blockset Library Simulink Block Simulink Library

Delays & Holds

Unit Delay Enabled External IC

Additional Math & Discrete / Additional Discrete

Delays & Holds

Unit Delay Enabled Resettable

Additional Math & Discrete / Additional Discrete

Delays & Holds

Unit Delay Enabled Resettable External IC

Unit Delay External IC

Additional Math & Discrete / Additional Discrete

Delays & Holds

Unit Delay Resettable

Additional Math & Discrete / Additional Discrete

Delays & Holds

Unit Delay Resettable External IC

Additional Math & Discrete / Additional Discrete

Delays & Holds

Unit Delay With Preview Enabled

Additional Math & Discrete / Additional Discrete

Unit Delay With Preview Enabled Resettable

Unit Delay With Preview Enabled Resettable External RV

Unit Delay With Preview Resettable

Delays & Holds

Unit Delay With Preview Enabled Resettable

Unit Delay With Preview Enabled Resettable External RV

Unit Delay With Preview Resettable

Additional Math & Discrete / Additional Discrete

Simulink®Fixed Point™ Release Notes

Former Fixed-Point Blockset Block

Unit Delay Preview Resettable External RV

Wrap To Zero

Zero-Order Hold Delays & Holds Zero-Order Hold

Former Fixed-Point Blockset Library Simulink Block Simulink Library

Delays & Holds

Nonlinear

Unit Delay With Preview Resettable External RV

Wrap To Zero

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 m ore 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:

1 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.

Additional Math & Discrete / Additional Discrete

Discontinuities

Discrete

2 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 s aturation and rounding code,andCheck the Hardware Implementation.

3 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

Version 5.0 (R14) Simulink®Fixed Point™ Software

with non-zero bias. Previously, these cases lead to code generation errors. Code w ill 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. T he 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:

•

fixptbestexp

• fixptbestprec

• fixpt_interp1

• fixpt_look1_func_approx

• fixpt_look1_func_plot

• fixpt_set_all

• float

• fxptdlg

• num2fixpt

• sfix

• sfrac

• sint

• ufix

• ufrac

Simulink®Fixed Point™ Release Notes

• uint

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 hadtobenegative,andsomeadditional 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 w ould not appear. The creation of the dialog has now been made robust to large fonts, a nd this problem is solved.

Lookup Table (2-D) Code Generation Bug Fixed

In a previous release, code generation w ould 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 4.1 (R13SP1) Fixed-Point Blockset Software

This table summarizes what’s new in Version 4.1 (R13SP1):

New Features and Changes

Yes Details below

Version Compatibility Considerations

No Yes

New features and changes introduced in this version are

• “Improved Treatment of Tunable Parameters” on page 55

• “Generated Code Improved for Lookup Tables and Division” on page 56

• “Major Bug Fixes” on p age 56

Fixed Bugs an d Known Problems

Details

Related Documentation at Web Site

Improved Treatment of Tunable Parameters

In Release 13, many Simulink and Fixed-Point Blockset blocks were unified. The unified blocks were designed to be fully compatible with models created in earlier releases. However, the unified rules for the treatment of tunable parameters caused compatibility problems for some legacy fixed-point models as discussed in “Backwards Compatibility of Tunable Parameters for Unified Fixed-Point Blocks” on pag e 58. In this release, these rules have been improved.

A fixed-point model created in Release 1 2.1 may have experienced problems with tunable parameters when generating code with Versions 5.0 or 5.0.1 of the Real-Time Workshop software. With the current release, a model createdinRelease12.1willbeabletogeneratecodewithoutcompatibility problems. Please note that the steps described in “Version 4.0.1 (R13+) Fixed-Point Blockset S oftw are” on page 58 of these Release Notes to solve these compatibility problems do not need to be reversed. The new rules are compatible both with legacy fixed-point models from Release 12.1 and with models that used the work-around described for the previous release.

Simulink®Fixed Point™ Release Notes

Generated Code Improved for Lookup Tables and Division

The generated code for utilities that support integer and fixed-point math have been improved to reduce the amount of ROM required. In particular, code that supports lookup tables and division has been improved. The generated code for these operations has been restructured to make greater use of shared functions and less use of inlined code.

Major Bug Fixes

This section summarizes the major bug fixes introduced in Version 4.1 of the Fixed-Point Blockset software.

Plot System Dialog Signal Information Co rrected

The Plot System dialog is a tool that allow s fixed-point simulation results to be easily compared against equivalent floating-p oint simulation results. Access this dialog by opening the Fixed-Point Settings interface from the Simulink Tools menu, and then clicking the Show plot dialog icon. For the current model, the dialog provides a lis t of signals that are logged to the workspace by To Workspace blocks, Scope blocks, and root-level Outport blocks. Signals from this list can be selected, and then plotted in three ways.

There are three plot buttons in the Plot System dialog. The Plot Signals button shows the simulation results that are collected using the model’s specified data types. The Plot Doubles button shows the simulation results that are collected wh en the m odel’s specified data types are overridden at the root level by True Doubles or Scaled Doubles. The Plot Both button shows both results simultaneously, making it easy to compare fixed-point behavior against idealized floating-point behavior.

In Release 13, the Plot System dialog did not al ways work properly. Clicking any of the three plot buttons could plot the wrong signals or lead to incorrect error messages. These errors have been corrected. Signals are now associated with the correct plot buttons. In addition, the error messages have been changed to give improved instructions on how to collect the data required by each button.

Version 4.1 (R13SP1) Fixed-Point Blockset Software

Fixed-Point Settings Interface Now Usable for Large Fonts

Simulink®Fixed Point™ Release Notes

Version 4.0.1 (R13+) Fixed-Point Blockset Software

This table summarizes what’s new in Version 4.0.1 (R13+):

New Features and Changes

Yes

Version Compatibility Considerations

Yes—Details labeled as Compatibility Considerations, below. Se e also Summary.

The major cha nge introduced in this version is

Fixed Bugs an d Known Problems

Fixed bugs

Related Documentation at Web Site

Backwards Compatibility of Tunable Parameters for Unified Fixed-Point Blocks

Unified fixed-point blocks with tunable parameters have com patibility problems under certain conditions in Release 13. The problem arises only if a tunable paramet er is mapped to a built-in integer or When tunable parameters are mapped to built-in integers or generated by the Real-Time Workshop product will be different for unified blocks than it was for Fixed-Point Blockset blocks in prior releases. There are no compatibility problems if a tunable parameter maps to a nonbuilt-in data type, such a s a scaled fixed-point integer.

single data type.

single,thecode

Compatibility Considerations

Tunable parameters are entered in a Simulink model by specifying the name of a MATLAB variable in a block’s dialog. This variable can be either a plain MATLAB variable or a Simulink parameter object. In either case , a numerical valuewillbedefinedforthistunableparameter by doing an assignment in MATLAB. MATLAB supports several numerical data types including the eight Simulink built-in numerical data types:

int16, uint16, int32,anduint32. One of these eight data types can be used

when a value is defined for a MATLAB variable. The effect of the data type of the MATLAB variable is significantly different depending on how the tunable parameter is used in the Simulink model.

double, single, int8, uint8,

Version 4.0.1 (R13+) Fixed-Point Blockset Software

For Simulink built-in blocks, the legacy rule is to fully respect the data type used for the value of a MATLAB variable. Whatever data type is used in MATLAB when assigning a value to a variable is also used when declaring that param eter in code generated by the Real-Time Workshop product. The use of that parameter by a block may require the value to be represented using a different data type. If so, additional code is generated to convert the parameter every time it is used by the block. Togetthemostefficientcode for a given block, the value of the MATLAB variable should use the same data type as is needed by the block.

For Fixed-Point Blockset blocks, the legacy rule is to expect no data type information from the MATLAB variable used for the tunable parameter. A fundamental reason for this is that MATLAB does not have native support for fixed-point data types and scaling, so the Simulink built-in legacy rule could not be directly extended to the general fixed-point case. Many fixed-point blocks automatically determine the data type and scaling for parameters based on what leads to the most efficient implementation of a given block. However, certain blocks such as Constant, as well as blocks that use tunable parameters in multiplication, do not imply a unique best choice for the data type and scaling of the parameter. These blocks have provided separate parameters on their dialogs for entering this information.

In Release 13, many Simulink built-in blocks and Fixed-Point Blockset blocks were unified. The Saturation block is an example of a unified block. The Saturation block appears in both the Simulink Library and in the Fixed-Point Blockset Library, but regardless of where it appears it has identical behavior. This identical unified behavior includes the treatment of tunable parameters. The dissimilarity of the legacy rules for tunable parameters has lead to a shortcoming in the unified blocks. Unified blocks obey the Simulink legacy rule sometimes and the Fixed-Point Blockset legacy rule at other times. If the block is using the parameter with built-in Simulink data types, then the Simulink legacy rule applies. If the block is using the parameter with nonbuilt-in data types, such as scaled fixed-point data types, then the Fixed-Point Blockset legacy rule applies. This gives full backwards compatibility with one important exception.

The backwards compatibility issue arises when a model created prior to R13 uses a Fixed-Point Blockset block with a tunable parameter, and the data type used by the block happens to be a built-in data type. If the block is unified, it will now handle the parameter using the Simulink legacy rule

Simulink®Fixed Point™ Release Notes

rather than the Fixed-Point Blockset legacy rule. This can have a significant impact. For example, suppose the tunable parameter is used in a Saturation block and the data type of the input signal is a built- in releases, the Fixed-Point Blockset block would have declared the parameter as an

int16. For legacy fixed-point models, the MATL AB variables used for

tunable parameters invariably gave their value using floating-point The unified Saturation block would now declare the tunable param eter in the generated code as six more bytes of memory as a Saturation block now includes conversions from every time the block executes. This increases code size and slows down execution. If the design was intended for use on a fixed-point processor, the use of floating-point variables and floating-point conversion code is likely to be unacceptable. It should be noted that the numerical behavior of the blocks is not changed even though the generate d code is different.

For an individual block, the backwards compatibility issue is easily solved. The solution involves understanding that the Simulink legacy rule is being applied. The Simulink legacy rule preserves the data type used when assigning the value to the MATLAB variable. The problem is that an undesired data type will be used in the generated code. To solve this, you should change the way you assign the value of the tunable parameter. Determine what data type is desired in the generated code, then use an explicit type cast when assigning the value in MATLAB. For example, if is desired in the generated code and the initial value is 3, then assign the value in MATLAB as

int16.Inprior

double.

double. This has several negatives. The variable takes up

double than as an int16. The code for the

double to int16 th at execute

int16

int16(3). The generated code will now be as desired.

A preliminary step to solving this issue with tunable parameters is identifying which blocks are affected. In most cases, the treatment of the parameter will involve a downcast from tab of the Simulation Parameters dialog is a line item called

downcast

. Setting this item to W arning or None will help identify the blocks

double to a smaller data type. On the Diagnostics

Parameter

whose tunable parameters require reassignment of their variables.

In R13, the solution described above did not work for three unified blocks: Switch, Look-Up Table, and Lookup Table (2-D ). These blocks caused errors when the value of a tunable p ara m ete r was specified using integer data types. This was a false error and has been removed. Usin g an explicit type cast when assigning a value to the MATLAB variable now solves the issue of generating code with the desired data types.

Version 4.0 (R13) Fixed-Point Blockset Software

This table summarizes what’s new in Version 4.0 (R13):

New Features and Changes

Yes Details below

Version Compatibility Considerations

Yes—Details labeled as Compatibility Considerations, below. Se e also Summary.

New features and changes introduced in this version are

• “Installation and Licensing” on page 61

• “Unified Simulink and Fixed-Point Blockset Blocks” on page 62

• “Global Data Type Override and Logging Modes” on page 64

• “Shift Arithmetic Block” on page 65

Fixed Bugs an d Known Problems

No bug fixes

Related Documentation at Web Site

Installation and Licensing

To support the sharing of models in a large organization, Version 4.0 of the Fixed-Point Blockset product is a utomatically installed whenever the Simulink software is installed. You can configure models to either take full advantage of all fixed-point features, or to run without a Fixed-Point Blockset software license. Therefore all Simulink software users in your organization can run and work on the same model, regardless of whether they have a Fixed-Point Blockset software license.

YoumusthaveaFixed-PointBlocksetsoftwarelicensetorunamodelifitis configured to log minimums, maximums, or overflows. You control logging with the system-level setting Logging mode. If you turn logging off at the top-level system in a model, then no data is logged for any block in any subsystem of th e model, and a Fixed-P oi nt Blockset softwar e license is not required. Y ou also need a Fixed-Point Blockset software license to run a model that uses any nonbuilt-in, fixed-point data types. However, you can use the system-level setting Data type override to force blocks to use

doubles

Simulink®Fixed Point™ Release Notes

or singles instead of fixed-point data types. Therefore, by turning the Data type override parameter on and the Logging mode parameter off at the

top level of a model, a Simulink so ftw are user without a Fixed-Point Blockset software license can run a model with fixed-point enabled blocks. See “Global Data Type Ov erride and Logging Modes” on page 64 for mo re information on these settings.

If you have a Fixed-Point Blockset s oftw are license, you can run bit-true simulations with your models that contain fixed-point enabled blocks. If a Fixed-Point Blockset software license is not available or desired, you can turn log ging off and data type override on at the top level of your model and perform idealized floating point-based simulations.

IfyouhavebothaFixed-PointBlockset software license and a Real-Time Workshop software license, you can generate bit-true integer code from y our models with fixed-point enabled blocks. If you do not have a Fixed-Point Blockset software license but you do have a Real-Time Workshop software license, you can generate idealized floating-point code from your models with fixed-point enabled blocks.

Unified Simulink and Fixed-Point Blockset Blocks

Many core Simulink and Fixed-Point Blockset blocks with sim ilar functions have been unified in this release. For example, the Sum block in the Simulink Math Operations library and the Sum block in the Fixed-Point Blockset Math library are now the same block. All the functionality from each original block has been maintained in unifying these blocks. Compatibility with fixed-point data types and/or specific fixed-point features are now available with all of these blocks, whether the blocks used are from the Simulink library or the Fixed-Point Blockset library. You do no t need to make any changes to your earlier models as a result of this improvement. You can now use any of the unified blocks with either built-in data types or fixed-point data types, which eliminates the need to replace blocks in your models when you want to use different data types. This change does not require Simulink software users to have a Fixed-Point Blockset software license. Refer to “Installation and Licensing” on page 61 for more information.

Fixed-Point Blockset blocks that have been unified no longer have an “F” on their block icon. However, not all Fixed-Point Blockset blocks that have counterparts in the Simulink library have been unified. You can still use the

fixpt_convert function to replace nonunified Simulink blocks with their

corresponding Fixed-Point Blockset blocks in your models.

Nonunified Fixed-Point Blockset blocks have an advantage over their Simulink library counterparts in that they can handle more data types. As discussed above, you can easily switch them between fixed-point data types and singles or doubles using the global data type override setting. However, you may still want to use the Simulink library counterparts of nonunified Fixed-Point Blockset blocks in som e cases, because they support faster simulation times for the data types they handle.

The following table lists the unified blocks in this release, and the Simulink and Fixed-Point Blockset libraries in which they are found.

Block Simulink Library

Version 4.0 (R13) Fixed-Point Blockset Software

Fixed-Point Bloc kset Library

Abs Math Operations

Math

Constant Sources Sources

Data Store Memory Signal Routing N/A

Data Store Read Signal Routing N/A

Data Store Write Signal Routing N /A

Gain Math Operations

Inport

Ports & Subsystems, Sources N/A

Math

Logical Operator Math Operations Logic & Comparison

Look-Up Table Look-Up Tables LookUp

Look-Up Table (2-D)

Look-Up Tables LookUp

Manual Switch Signal Routing N/A

Memory

Merge

Discrete

N/A

Signal Routing N/A

Multi-Port Switch Signal Routing S e lec t

Outport Ports & Subsystems, Sinks N/A

Product

Math Operations

Math

Simulink®Fixed Point™ Release Notes

Block Simulink Library

Fixed-Point Bloc kset Library

Rate Transition

Relational Operator Math Operations Logic & Comparison

Relay Discontinuities Nonlinear

Saturation

Sign Math Operations

Signal Specification Signal Attributes N/A

Slider Gain Math Operations N/A

Sum Math Operations

Switch Signal Routing Select

Unit Delay Discrete

Zero-Order Hold

Signal Attributes N/A

Discontinuities Nonlinear

Nonlinear

Math

Delays & Holds

Discrete

Delays & Holds

Compatibility Considerations

Breaking library links to Fixed-Point Blockset blocks will almost certainly produce an error when you attempt to run the model. If broken links exist, you will likely uncover them when upgrading to the latest release of the Fixed-Point Blockset software. The used to restore links for Fixed-Point Blockset blocks.

fixpt_restore_links command can be

Global Data Type Override and Logging Modes

You can now set data type override and logging modes for systems or subsystems in the Fixed-Point Blockset Interface. The Override data type(s) with doubles and Log minimums and maximums check boxes have been removed from the mask of every Fixed-Point Blockset block.

Compatibility Considerations

The Override data type(s) with doubles and Log minimums and maximums check boxes have been removed from the mask of every

Fixed-Point Blockset block. You can now set these parameters on the system or subsystem level.

Version 4.0 (R13) Fixed-Point Blockset Software

When you upgrade to Version 4.0, all doubles override and logging information is cleared from your models. You can reset these controls in the Fixed-Point Blockset Interface for any system or subsystem. Access the Fixed-Point Blockset Interfa ce from the Simulink Tools menu, or by typing

fxptdlg('modelname') at the MATLAB command line.

Ifyouhavebeengettingorsetting the block parameters your M-code, you must now use the system parameters and MinMaxOverflowLogging.

DblOver or dolog in

DataTypeOverride

Shift Arithmetic Block

The Fixed-Point Blockset software now includes the Shift Arithmetic block in the Bits library. The Shift Arithmetic block shifts the bits or binary point of asignal,orboth.

Simulink®Fixed Point™ Release Notes

Compatibility Summary for Simulink Fixed Point Software

This table summarizes new features and changes that might cause incompatibilities when you upgrade from an earlier version, or wh en you use files on multiple versions. Details are provided in the description of the new feature or change.

Version (Release) New Features and Changes with Version

Compatibility Impact

Latest Version V6.3 (R2010a)

V6.2.(R2009b)

V6.1 (R2009a) See the Compatibility Considerations

V6.0 (R2008b) See the Compatibility Considerations

V5.6.1 (R2008a+)

V5.6 (R2008a)

None

subheading for these new features or changes:

• “Lookup Table (n-D) and Interpolation

Using Prelookup Blocks Perform Efficient Fixed-Point Interpolations” on page 20

• “Rounding Modes Convergent and Round

Added to Multiple Blocks” on page 21

subheading for these new features or changes:

• “Cell Array No Longer Created When Data

Logging Is Enabled in the Fixed-Point Tool” on page 27

• “Functions Being Removed in a Future

Version” on page 29

None

V5.5.1 (R2007b+)

None

Compatibility Summary for Simulink®Fixed Point™ Software

Version (Release) New Features and Changes with Version

Compatibility Impact

V5.5 (R2007b)

V5.4.1 (R2007a+)

V5.4 (R2007a)

V5.3 (R2006b)

V5.2.1 (R2006a+)

V5.2 (R2006a)

V5.0 (R14)

V4.1 (R13SP1)

See the Compatibility Considerations subheading for this new feature or change:

• “Non-Matrix-Wise Parameter Scaling Modes

Removed” on page 35

None

See the Compatibility Considerations subheading for this new feature or change:

• “Obsolete Functions” on page 54

None

V4.0.1 (R13+)

See the Compatibility Considerations subheading for this new feature or change:

• “Backwards Compatibility of Tunable

Parameters for Unified Fixed-Point Blocks” on page 58

Simulink®Fixed Point™ Release Notes

Version (Release) New Features and Changes with Version

Compatibility Impact

V4.0 (R13)

See the Compatibility Considerations subheading for each of these new featu res or changes:

• “Unified Simulink and Fixed-Point Blockset

Blocks” on page 62

• “Global Data Type Override and Logging

Modes” on page 64

Mathworks SIMULINK FIXED POINT RELEASE NOTES

Specifications and Main Features

Frequently Asked Questions

User Manual