src/systemc/tests/systemc/misc/sim_tests/multtrans/multtrans0/multtrans0.cpp

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/*****************************************************************************

  multtrans0.cpp -- 

  Original Author: Martin Janssen, Synopsys, Inc., 2002-02-15

 *****************************************************************************/

/*****************************************************************************

  MODIFICATION LOG - modifiers, enter your name, affiliation, date and
  changes you are making here.

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  Description of Modification:

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#include "systemc.h"

SC_MODULE( delay1 )
{
  SC_HAS_PROCESS( delay1 );

  sc_in<int>  data_i;
  sc_out<int> data_o;

  // Constructor
  delay1( sc_module_name NAME,
          sc_signal<int>& DATA_I,
          sc_signal<int>& DATA_O )
  {
    data_i(DATA_I);
	data_o(DATA_O);
    SC_THREAD( entry );
    sensitive << data_i;
  }

  // Functionality
  void entry();
};

void delay1::entry()
{
  wait();
  int buffer;
  wait(); // until the first real event
  buffer = data_i.read(); 
  wait(); // until you get the next sample to send data out
  while (true) {
    data_o.write(buffer);
    buffer = data_i.read();
    wait();
  }
}

SC_MODULE( state_machine )
{
  SC_HAS_PROCESS( state_machine );

  sc_in<int>  data_i1;
  sc_in<int>  data_i2;
  sc_out<int> data_o;

  int state;

  // Constructor
  state_machine( sc_module_name NAME,
		 sc_signal<int>& DATA_I1,
		 sc_signal<int>& DATA_I2,
		 sc_signal<int>& DATA_O )
  {
    data_i1(DATA_I1); data_i2(DATA_I2); data_o(DATA_O);
    SC_METHOD( entry );
    sensitive << data_i1 << data_i2;

    state = 0;
  }

  // Functionality
  void entry();
};

void state_machine::entry()
{
  switch(state) {
  case 0: // initial state
    cout << "In state 0 :: " << flush;
    if (data_i1.event()) {
      if (data_i2.event()) {
	data_o.write(data_i1.read() + data_i2.read());
	cout << "staying in state 0" << endl;
      }
      else {
	state = 1;
	cout << "going to state 1" << endl;
	// No output is written
      }
    }
    else if (data_i2.event()) {
      state = 2;
      cout << "going to state 2" << endl;
      // No output is written
    }
    break;
  case 1: // Event on First input seen only
    cout << "In state 1 :: " << flush;
    if (data_i2.event()) {
      if (data_i1.event()) {
	state = 0;
	cout << "going to state 0" << endl;
	data_o.write(data_i1.read() + data_i2.read());
      }
      else {
	cout << "going to state 2" << endl;
	state = 2;
	// No output written
      }
    }
    else {
      cout << "staying in state 1" << endl;
    }
    break;
  case 2:
    cout << "In state 2 :: " << flush;
    if (data_i1.event()) {
      if (data_i2.event()) {
	state = 0;
	cout << "going to state 0" << endl;
	data_o.write(data_i1.read() + data_i2.read());
      }
      else {
	cout << "going to state 1" << endl;
	state = 1;
	// No output written
      }
    }
    else {
      cout << "staying in state 2" << endl;
    }
    break;
  default: 
    cout << "In bad state - resetting" << endl;
    state = 0;
    break;
  }
}

void testbench(sc_signal<int>& data, const sc_signal<int>& res)
{
  int i;
  sc_start(0, SC_NS);
  for (i=0; i<10; i++) {
    data.write(i*10 + 123);
    sc_start( 10, SC_NS );
    cout << "Result = " << res.read() << endl;
    data.write(i * 11 - 34);
    sc_start( 10, SC_NS );
    cout << "Result = " << res.read() << endl;
  }
}

int
sc_main(int ac, char *av[])
{
  sc_signal<int> data_gen("Data");
  sc_signal<int> data_delayed("DelayedData");
  sc_signal<int> result("Result");

  data_gen = 0;
  data_delayed = 0;
  result = 0;

  delay1 D1("DL", data_gen, data_delayed);
  state_machine SM("SM", data_gen, data_delayed, result);

  testbench(data_gen, result);
  return 0;
}