DSP Builder for Intel® FPGAs (Advanced Blockset): Handbook

ID 683337
Date 4/01/2024
Document Table of Contents Creating the Finite State Machine Configuration File

The DSP Builder m-script, substitutePlaceholderValues, allows you to insert parameter values into a .fsm configuration template file.
Figure 145. Example count_edges_template.fsm
# Counts N rising/falling edges
require version 23.3
inputs x
finish done
for n 0 < %NEDGES% : c
    transitions EdgeDetect
        state Initial
            if (~x) Low
            if (x) High
        state Low
            if (x) %RISING%
        state High
            if (~x) %FALLING%


  1. In the setup script for your DSP Builder model, create a cell array that defines the parameter values:
    Figure 146. Parameter ValuesThe parameter placeholder names do not have to be in the %NAME% format. They can be any arbitrary string. Adding a unique delimiter makes it easier to identify what is a parameter.
    parameterDefinitions = {
        {'%NEDGES%', 5 },
        {'%RISING%', 'Initial'},
        {'%FALLING%', 'Low'}};
  2. Generate the .fsm configuration file that the Finite State Machine block uses by calling the m-script:
    substitutePlaceholderValues(parameterDefinitions, 'count_edges_template.fsm', 'count_rising_edges.fsm');