Native Floating Point Support for Simulink Blocks

You can use HDL Coder™ native floating-point to generate target-independent HDL code from a floating-point design. Floating-point designs have better precision, higher dynamic range, and a shorter development cycle than fixed-point designs. If your design has complex math and trigonometric operations, use native floating-point technology.

This page lists the Simulink^® blocks and parameter settings that you can use with HDL Coder native floating point.

HDL Floating Point Operations Library

In the HDL Floating Point Operations library, HDL Coder supports blocks that have single and double data types in the native floating-point mode. For certain blocks, such as Discrete-Time Integrator and Discrete PID Controller, use zero latency strategy.

When you use half types, HDL Coder supports native floating-point for these blocks:

Support for Simulink Blocks in Math Operations Library

In the Math Operations library, HDL Coder supports native floating-point for these blocks and data types:

Block Name	Half Data Type Support	Single Data Type Support	Double Data Type Support	Complex Data Support	Remarks
Abs	Yes	Yes	Yes	Yes
Add	Yes	Yes	Yes	Yes
Assignment	No	Yes	Yes	Yes
Bias	No	Yes	Yes	Yes
Complex to Real-Imag	No	Yes	Yes	Yes
Divide	Yes	Yes	Yes	No
Dot Product	Yes	Yes	Yes	No
Gain	Yes	Yes	Yes	Yes
MinMax	No	Yes	Yes	No
Multiply-Add	Yes	Yes	Yes	Yes
Product	Yes	Yes	Yes	Yes	If you configure the block to perform matrix multiplication by setting the Multiplication block parameter to `Matrix()`, the DotProductStrategy* must be set to `Fully Parallel`.
Product of Elements	Yes	Yes	Yes	Yes
Real-Imag to Complex	No	Yes	Yes	No
Reciprocal Sqrt	No	Yes	Yes	No
Reshape	Yes	Yes	Yes	Yes
Sqrt	No	Yes	Yes	No
Subtract	Yes	Yes	Yes	Yes
Sum	Yes	Yes	Yes	Yes
Sum of Elements	Yes	Yes	Yes	Yes
Trigonometric Function	No	Yes	No	No
Unary Minus	Yes	Yes	Yes	Yes
Vector Concatenate, Matrix Concatenate	Yes	Yes	Yes	Yes

Support for Functions in Math Function Block

In the Math Function block, HDL Coder supports native floating-point for these functions:

Math Functions	Floating-Point Support			Complex Data Support
Math Functions	Half Data Type	Single Data Type	Double Data Type	Complex Data Support
`exp`	No	Yes	No	No
`log`	No	Yes	Yes	No
`10^u`	No	Yes	No	No
`log10`	No	Yes	No	No
`magnitude^2`	No	Yes	Yes	Yes
`square`	No	Yes	No	Yes
`pow`	No	Yes	No	No
`conj`	No	Yes	No	Yes
`reciprocal`	Yes	Yes	Yes	No
`hypot`	No	Yes	No	No
`rem`	No	Yes	No	No
`mod`	No	Yes	No	No
`transpose`	Yes	Yes	Yes	Yes
`hermitian`	No	Yes	No	Yes

Support for Simulink Blocks in Other Libraries

HDL Coder supports native floating-point for these HDL Coder block libraries.

Block Library	Half Data Type Support	Single Data Type Support	Double Data Type Support
Discrete	The set of delay blocks including the synchronous blocks Integer Delay Tapped Delay	Zero Order Hold Set of delay blocks including the synchronous blocks, and Integer Delay, and Tapped Delay.	Zero Order Hold Set of delay blocks including the synchronous blocks, and Integer Delay, and Tapped Delay.
HDL Operations	Blocks in this library are not supported.	All blocks are supported.	All blocks are supported.
HDL RAMs	Blocks in this library are not supported.	All blocks are supported.	All blocks are supported.
HDL Subsystems	All blocks are supported.	All blocks are supported.	All blocks are supported.
Logic and Bit Operations	Compare to Constant Relational Operator Logical Operator Detect Change Detect Increase Detect Decrease	All blocks are supported.	All blocks are supported.
Lookup Tables	Blocks in this library are not supported.	All blocks are supported.	All blocks are supported.
Model Verification	Blocks in this library are not supported.	All blocks are supported.	All blocks are supported.
Model-Wide Utilities	Blocks in this library are not supported.	All blocks are supported.	All blocks are supported.
Ports & Subsystems	Enable, reset, input, and output ports Model references Subsystems	Enable, reset, input, and output ports Model references Subsystems	Enable, reset, input, and output ports Model references Subsystems
Signal Attributes	Data Type Conversion Data Type Duplicate Rate Transition Signal Specification Signal Conversion Bus to Vector Probe	All blocks are supported.	All blocks are supported.
Signal Routing	All blocks are supported.	All blocks are supported.	All blocks are supported.
Sources	Inport, Constant, and Ground blocks.	Inport, Constant, and Ground blocks.	Inport, Constant, and Ground blocks.
Sinks	All blocks are supported.	All blocks are supported.	All blocks are supported.
User-Defined Functions	MATLAB Function blocks.	MATLAB Function blocks.	MATLAB Function blocks.

Support for Stateflow Charts

HDL Coder supports Stateflow^® charts with these data types when generating code in native floating-point mode:

Floating-point constants
Floating-point inputs
Function calls with floating-point arguments
Floating-point arithmetic operations

These chart types are supported:

Classic charts
Mealy charts
State transition tables
Truth tables
Requirement tables

Stateflow charts and Moore charts with conditional transitions are not supported. For more information on conditional transitions in Stateflow charts, see Transition Between Operating Modes (Stateflow).

Simulink Block Restrictions

HDL Coder does not support native floating-point for these blocks or block architectures:

Dot Product blocks that have complex-valued input or output data with the Architecture parameter set to Tree or Linear
Dead Zone and Dead Zone Dynamic blocks
Polar to Cartesian blocks

For the Data Type Conversion block:

The Input and output to have equal parameter cannot be set to Stored Integer (SI).
The Saturate on integer overflow check box must be left cleared.