biquad.h

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/*****************************************************************************
 
  biquad.h -- 
 
  Original Author: Martin Janssen, Synopsys, Inc., 2002-02-15
 
 *****************************************************************************/
 
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/* Filename biquad.h */
/* This is the interface file for synchronous process `biquad' */
 
#include "systemc.h"
 
SC_MODULE( biquad )
{
  SC_HAS_PROCESS( biquad );
 
  sc_in_clk clk;
 
  sc_in<float>  in;
  sc_in<bool>   reset;
  sc_out<float> out;
 
  int num_taps; //internal variable
  float Del[4]; //internal variable
  float Cte[5]; //internal variable
 
  // Constructor 
  biquad( sc_module_name NAME,
          sc_clock& CLK,
          sc_signal<float>& IN1,
          sc_signal<bool>& RESET,
          sc_signal<float>& OUT1 )
  {
    clk(CLK);
    in(IN1); reset(RESET); out(OUT1);
        SC_CTHREAD( entry, clk.pos() );
    reset_signal_is(reset,true);
    // initialize Del (to avoid UMRs)
    Del[0] = Del[1] = Del[2] = Del[3] = 0;
    // initialize the coefficient matrix
    Cte[0] = 1.0;
    Cte[1] = 2.0;
    Cte[2] = 1.0;
    Cte[3] = 0.75;
    Cte[4] = -0.125;
  }
 
  // Process functionality in member function below
  void entry();
};