112855Sgabeblack@google.com/*****************************************************************************
212855Sgabeblack@google.com
312855Sgabeblack@google.com  Licensed to Accellera Systems Initiative Inc. (Accellera) under one or
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512855Sgabeblack@google.com  with this work for additional information regarding copyright ownership.
612855Sgabeblack@google.com  Accellera licenses this file to you under the Apache License, Version 2.0
712855Sgabeblack@google.com  (the "License"); you may not use this file except in compliance with the
812855Sgabeblack@google.com  License.  You may obtain a copy of the License at
912855Sgabeblack@google.com
1012855Sgabeblack@google.com    http://www.apache.org/licenses/LICENSE-2.0
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1212855Sgabeblack@google.com  Unless required by applicable law or agreed to in writing, software
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1812855Sgabeblack@google.com *****************************************************************************/
1912855Sgabeblack@google.com
2012855Sgabeblack@google.com/*****************************************************************************
2112855Sgabeblack@google.com
2212855Sgabeblack@google.com  biquad.h --
2312855Sgabeblack@google.com
2412855Sgabeblack@google.com  Original Author: Martin Janssen, Synopsys, Inc., 2002-02-15
2512855Sgabeblack@google.com
2612855Sgabeblack@google.com *****************************************************************************/
2712855Sgabeblack@google.com
2812855Sgabeblack@google.com/*****************************************************************************
2912855Sgabeblack@google.com
3012855Sgabeblack@google.com  MODIFICATION LOG - modifiers, enter your name, affiliation, date and
3112855Sgabeblack@google.com  changes you are making here.
3212855Sgabeblack@google.com
3312855Sgabeblack@google.com      Name, Affiliation, Date:
3412855Sgabeblack@google.com  Description of Modification:
3512855Sgabeblack@google.com
3612855Sgabeblack@google.com *****************************************************************************/
3712855Sgabeblack@google.com
3812855Sgabeblack@google.com/* Filename biquad.h */
3912855Sgabeblack@google.com/* This is the interface file for synchronous process `biquad' */
4012855Sgabeblack@google.com
4112855Sgabeblack@google.com#include "systemc.h"
4212855Sgabeblack@google.com
4312855Sgabeblack@google.comSC_MODULE( biquad )
4412855Sgabeblack@google.com{
4512855Sgabeblack@google.com  SC_HAS_PROCESS( biquad );
4612855Sgabeblack@google.com
4712855Sgabeblack@google.com  sc_in_clk clk;
4812855Sgabeblack@google.com
4912855Sgabeblack@google.com  sc_in<float>  in;
5012855Sgabeblack@google.com  sc_in<bool>   reset;
5112855Sgabeblack@google.com  sc_out<float> out;
5212855Sgabeblack@google.com
5312855Sgabeblack@google.com  int num_taps; //internal variable
5412855Sgabeblack@google.com  float Del[4]; //internal variable
5512855Sgabeblack@google.com  float Cte[5]; //internal variable
5612855Sgabeblack@google.com
5712855Sgabeblack@google.com  // Constructor
5812855Sgabeblack@google.com  biquad( sc_module_name NAME,
5912855Sgabeblack@google.com	  sc_clock& CLK,
6012855Sgabeblack@google.com	  sc_signal<float>& IN1,
6112855Sgabeblack@google.com	  sc_signal<bool>& RESET,
6212855Sgabeblack@google.com	  sc_signal<float>& OUT1 )
6312855Sgabeblack@google.com  {
6412855Sgabeblack@google.com    clk(CLK);
6512855Sgabeblack@google.com    in(IN1); reset(RESET); out(OUT1);
6612855Sgabeblack@google.com	SC_CTHREAD( entry, clk.pos() );
6712855Sgabeblack@google.com    reset_signal_is(reset,true);
6812855Sgabeblack@google.com    // initialize Del (to avoid UMRs)
6912855Sgabeblack@google.com    Del[0] = Del[1] = Del[2] = Del[3] = 0;
7012855Sgabeblack@google.com    // initialize the coefficient matrix
7112855Sgabeblack@google.com    Cte[0] = 1.0;
7212855Sgabeblack@google.com    Cte[1] = 2.0;
7312855Sgabeblack@google.com    Cte[2] = 1.0;
7412855Sgabeblack@google.com    Cte[3] = 0.75;
7512855Sgabeblack@google.com    Cte[4] = -0.125;
7612855Sgabeblack@google.com  }
7712855Sgabeblack@google.com
7812855Sgabeblack@google.com  // Process functionality in member function below
7912855Sgabeblack@google.com  void entry();
8012855Sgabeblack@google.com};
81