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8–10
Chapter 8: Using Black Boxes for HDL Subsystems
Subsystem Builder Design Example
ssSetNumNonsampledZCs(S, 0);
ssSetOptions(S, 0);
}
During simulation, Simulink invokes certain callback methods from the S-function.
The callback methods are subfunctions that initialize, update discrete states, and
calculate output. Table 8–1 shows the design example callback methods.
Table 8–1. S-Function Callback Methods
Callback Method
mdlInitializeSizes
mdlInitializeSampleTimes
mdlStart
mdlOutputs
mdlUpdate
mdlTerminate
Description
Specify the number of inputs, outputs, states, parameters,
and other characteristics of the S-function.
Specify the sample rates at which this S-function operates.
Initialize the vectors of this S-function.
Compute the signals that this block emits.
Update the states of the block.
Perform any actions required at termination of simulation.
1. At the MATLAB command prompt, type:
mex Sfir8tap.CPP r
The mex command compiles and links the source file into a shared library
executable in MATLAB, Sfir8tap.mexw32 . The extension is specific to 32-bit
version of MATLAB run in Windows.
2. Close the editor window and click on OK to close the Function Block Parameters
dialog box.
3. In the filter8tap/fir_vhdl window, connect the input port of the S-function block to
the data_in block, and connect the output port of the S-function block to the
data_out block ( Figure 8–8 ).
Figure 8–8. S-Function Block Connection
1
You do not need to connect the simulink_sclr block. The HDL Entity block
automatically maps any input ports named simulink_clock in the VHDL
entity to the global clock signal, and any input ports named simulink_sclr
to the global synchronous clear signal.
4. Click Save on the File menu to save the filter8tap.mdl file.
DSP Builder Handbook
Volume 2: DSP Builder Standard Blockset
November 2013 Altera Corporation
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