MATLAB SIMULINK FIXED POINT 6 Uživatelský manuál stáhnout pdf (Strana 5)

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TargetLink Data Types Application Note September 2004

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Block-specific Scaling Parameters

After compiled data types have been evaluated and TargetLink types

set accordingly, scaling parameters are retrieved on a block-by-block

basis. This is possible without compiling the model, for both model

and library conversion. However, if a block’s output inherits, for

example, an integer data type, this method will fail to detect it.

Additionally, since Simulink blocks do not have explicit scaling

parameters in Simulink 4, this step is confined to version 5 and later.

This is the second step in the conversion process. Thus, if model

compilation is not possible (for libraries), or if no Fixed-Point license is

available, Simulink scaling parameters will be mapped to TargetLink

scaling parameters during this step.

In Simulink 6, more blocks support block-specific types than in

Simulink 5. The overall number will most likely increase in future

Simulink versions.

The following table shows which Simulink block types support fixed-

point data types. Some blocks additionally support scaling parameters,

i.e., the output can be scaled. Output scaling is also taken into account

during conversion. The Simulink properties which define the fixed-

point settings are listed in the third column.

Block Type Ver. Simulink properties Scaling Remarks

DataStoreMemory 6.0+ DataType

OutDataType

OutScaling

Yes

Gain 5.0+ ParameterDataTypeMode

ParameterDataType

ParameterScalingMode

ParameterScaling

OutDataTypeMode

OutDataType

OutScaling

SaturateOnIntegerOverflow

Yes Both output

and gain can

be typed

Constant 5.0+ OutDataTypeMode

OutDataType

OutScaling

ConRadixGroup

Yes

1 2 3 4 5 6 7 8 9 10 ... 15 16

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