You can view and edit options and parameters that affect HDL code generation in the Configuration Parameters dialog box, or in the Model Explorer. This example illustrates how you can use the Configuration Parameters dialog box to generate HDL code for the Symmetric FIR filter model.
Before you generate HDL code, the model must be compatible for HDL code generation. To check and update your model for HDL compatibility, see Check HDL Compatibility of Simulink Model Using HDL Code Advisor.
This example uses the Symmetric FIR filter model that is compatible for HDL code generation. To open this model at the command line, enter:
The model uses a division of labor that is suitable for HDL design.
symmetric_fir subsystem, which implements the
filter algorithm, is the device under test (DUT). An HDL entity is
generated from this subsystem.
The top-level model components that drive the subsystem work as a test bench.
The top-level model generates 16-bit fixed-point input signals for
symmetric_fir subsystem. The Signal From Workspace block
generates a test input (stimulus) signal for the filter. The four
Constant blocks provide filter coefficients. The
Scope blocks are used for simulation and are not used for HDL
To navigate to the
Create a folder named
sl_hdlcoder_work stores a local copy of the example
model and folders and generated HDL code. Use a folder location that is
not within the MATLAB folder tree.
sl_hdlcoder_work folder your working
folder, for example:
Save a local copy of the
sfir_fixed model to your
current working folder. Leave the model open.
This figure shows the top-level HDL Code Generation pane of the Configuration Parameters dialog box. To open this dialog box, in the Apps gallery, click HDL Coder. The HDL Code tab appears. In the Prepare section, click Settings.
The HDL Code Generation pane consists of basic options that specify the DUT that you want to generate code for, target language, and folder settings. The Generate HDL for setting is synchronized with the Code for menu in the HDL Code tab. You can also use the buttons in this pane to initiate code generation and perform compatibility checking. The HDL Code Generation pane consists of various subpanes that you can use to specify various settings related to clock and reset signals to reporting and optimization settings.
In the HDL Code Generation pane
The Generate HDL for field specifies the
sfir_fixed/symmetric_fir subsystem for code
The Language field specifies generation of VHDL code.
The Folder field specifies a target folder that stores generated code files and scripts.
To learn more about the various parameters in the HDL Code Generation pane, see HDL Code Generation Options in Configuration Parameters Dialog Box.
To generate code, click the Generate button. By default,
HDL Coder™ generates VHDL code in the target
To generate Verilog code for the model:
In the HDL Code tab, click Settings.
In the HDL Code Generation pane, for
Leave other settings to the default. Click Apply
and then click Generate.
HDL Coder compiles the model before generating code. Depending on model display options such as port data types, the model can change in appearance after code generation. As code generation proceeds, HDL Coder displays progress messages in the MATLAB command line with:
Link to the Configuration Set that indicates the model for which the Configuration Parameters are applied.
Links to the generated files. To view the files in the MATLAB Editor, click the links.
symmetric_fir.vhd: VHDL code. This file
contains an entity definition and RTL architecture implementing
ModelSim® compilation script (vcom command) to compile the
generated VHDL code.
symmetric_fir_synplify.tcl: Synplify® synthesis script.
symmetric_fir_map.txt: This report maps
generated entities to the subsystems that generated them. See
Trace Code Using the Mapping File
The process completes with the message:
### HDL Code Generation Complete.