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

  Licensed to Accellera Systems Initiative Inc. (Accellera) under one or
  more contributor license agreements.  See the NOTICE file distributed
  with this work for additional information regarding copyright ownership.
  Accellera licenses this file to you under the Apache License, Version 2.0
  (the "License"); you may not use this file except in compliance with the
  License.  You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
  implied.  See the License for the specific language governing
  permissions and limitations under the License.

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

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

  popc.cpp -- 

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

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

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

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

      Name, Affiliation, Date:
  Description of Modification:

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

#include "systemc.h"

/*
 * Test bench
 */

SC_MODULE( proc1 )
{
  SC_HAS_PROCESS( proc1 );

  sc_in_clk clk;

  // Inputs
  sc_in<bool> data_ack;
  sc_in<int>  popc;
  // Outputs
  sc_out<bool> reset;
  sc_out<bool> data_ready;
  sc_out<int>  in;

  // Constructor
  proc1( sc_module_name NAME,
	 sc_clock& CLK,
	 sc_signal<bool>& DATA_ACK,
         sc_signal<int>& POPC,
         sc_signal<bool>& RESET,
	 sc_signal<bool>& DATA_READY,
         sc_signal<int>& IN_ )
  {
    clk(CLK);
    data_ack(DATA_ACK); popc(POPC);
    reset(RESET); data_ready(DATA_READY); in(IN_);
	SC_CTHREAD( entry, clk.pos() );
  }

  // Process functionality goes here
  void entry();
};

/*
 * popc - The process doing the population count
 *
 */

SC_MODULE( proc2 )
{
  SC_HAS_PROCESS( proc2 );

  sc_in_clk clk;

  // Inputs
  sc_in<bool> reset;
  sc_in<bool> data_ready;
  sc_in<int>  in;
  // Outputs
  sc_out<bool> data_ack;
  sc_out<int>  popc;

  // Internal variables
  int c;
  int t;
  int no;

  proc2( sc_module_name NAME,
	 sc_clock& CLK,
         sc_signal<bool>& RESET,
	 sc_signal<bool>& DATA_READY,
         sc_signal<int>& IN_,
	 sc_signal<bool>& DATA_ACK,
         sc_signal<int>& POPC )
  {
    clk(CLK);
    reset(RESET);   
    data_ready(DATA_READY);
    in(IN_);
    data_ack(DATA_ACK);
    popc(POPC);
    SC_CTHREAD( entry, clk.pos() );
    reset_signal_is(reset,true);
    c = 0;
    t = 0;
  }

  // Process functionality
  void entry();
};


/*
 * Testbench functionality
 */

void proc1::entry()
{
    int i;
    int j;

    j = 1;
    i = 0;
    data_ready.write(false);
    reset.write(false);

    wait();

    while(true){
	in.write(j);

        data_ready.write(true);
        do { wait(); } while (data_ack == false);
        data_ready.write(false);
        do { wait(); } while (data_ack == true);

        char buf[BUFSIZ];
        sprintf( buf, "Input: %7d   Population Count: %3d", j, popc.read() );
        cout << buf << endl;

	i++;

	if( i == 3){
		reset.write(true);
		wait();
		reset.write(false);
		wait(2);
	}

	if( i == 16)
	    sc_stop();

	j = (j<<1)|1;
    }
}


/*
 * popc - functionality
 */

void proc2::entry()
{
    // Reset behavior
    no = 0;
    data_ack.write(false);

    wait();
  
    while (true) {
        do { wait(); } while (data_ready == false);

	t = in.read();
	c = 0;
	while( t ){
	    c++;
	    t &= (t-1);
	    wait();
	}

	no++;
        popc.write(c);

        data_ack.write(true);
        do { wait(); } while (data_ready == true);
        data_ack.write(false);
    }
}


int
sc_main(int argc, char *argv[])
{
  sc_signal<bool>  data_ready("Ready");
  sc_signal<bool>  data_ack("Ack");
  sc_signal<int>   in;
  sc_signal<int>   popc;
  sc_signal<bool>  reset;

  sc_clock clock("CLOCK", 10, SC_NS, 0.5, 0.0, SC_NS);

  proc1 TestBench("TestBench", clock, data_ack, popc, reset, data_ready, in);
  proc2 Popc("Popc", clock, reset, data_ready, in,  data_ack, popc);


  // Create trace file
  sc_trace_file *tf = sc_create_vcd_trace_file("tracefile");
  // Trace signals
  sc_trace(tf, data_ready, "data_ready");
  sc_trace(tf, data_ack, "data_ack");
  sc_trace(tf, in, "in");
  sc_trace(tf, popc, "popc");
  sc_trace(tf, reset, "reset");
  // sc_trace(tf, clock.signal(), "Clock");
  sc_trace(tf, clock, "Clock");
  // Trace internal variables
  sc_trace(tf, Popc.t, "Popc.t");
  sc_trace(tf, Popc.c, "Popc.c");
  sc_trace(tf, Popc.no, "Popc.no");

  sc_start();
  return 0;
}