HDL code generation support for fixed-point run-time library functions from the Fixed-Point Designer™ is summarized in the following table. See Fixed-Point Function Limitations for general limitations of fixed-point run-time library functions for code generation.
| Function | Remarks and Limitations |
|---|---|
| Double and complex data types not supported. | |
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Both inputs must be
scalar, and the exponent input, | |
| — | |
| — | |
| — | |
Dimensions must be real, nonnegative integers. | |
Inputs cannot be data type logical. | |
Both inputs must be
scalar, and the exponent input, | |
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Supported data types for HDL code generation are listed in Supported MATLAB Data Types, Operators, and Control Flow Statements. | |
Supported data types for HDL code generation are listed in Supported MATLAB Data Types, Operators, and Control Flow Statements. | |
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Inputs cannot be data type logical. | |
| — | |
| — | |
| — | |
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In addition to function-specific limitations listed in the table, the following general limitations apply to the use of Fixed-Point Designer functions in generated HDL code:
fipref and quantizer objects
are not supported.
Slope and bias scaling are not supported.
Dot notation is only supported for getting the values
of fimath and numerictype properties.
Dot notation is not supported for fi objects, and
it is not supported for setting properties.
Word lengths greater than 128 bits are not supported.
You cannot change the fimath or numerictype of
a given variable after that variable has been created.
The boolean and ScaledDouble values
of the DataTypeMode and DataType properties
are not supported.
For all SumMode property
settings other than FullPrecision, the CastBeforeSum property
must be set to true.
The numel function returns the
number of elements of fi objects in the generated
code.
General limitations of C/C++ code generated from MATLAB apply. See MATLAB Language Features That Code Generation Does Not Support (Fixed-Point Designer) for more information.