xref: /gem5/src/systemc/tests/systemc/misc/user_guide/newsched/test1/test1.cpp

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

  test1.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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/*
  Corner case testing for new scheduler.
  Case 1. Checking triggering of a sc_async/sc_aproc
  vis-a-vis a synchronous process.
  This test checks to ensure that a synch. and async. sensitive
  to a clock are triggered correctly.
  */

#include "systemc.h"

SC_MODULE( syncproc )
{
  SC_HAS_PROCESS( syncproc );

  sc_in<bool> clk;

  const sc_signal<int>& in1;
  const sc_signal<int>& in2;
  sc_signal<int>& out;

  syncproc(sc_module_name NAME,
	   sc_signal_in_if<bool>& CLK,
	   const sc_signal<int>& IN1,
	   const sc_signal<int>& IN2,
	   sc_signal<int>& OUT_)
    : in1(IN1), in2(IN2), out(OUT_)
  {
    SC_CTHREAD( entry, clk.pos() );
    clk(CLK);
    out = 0;
  }

  void entry()
  {
    int i = 100;
    while (true) {
      out = i;
      wait();
      while (in1.read() != i) {
	cout << "Sync: Value written = " << i << "  value1 read = " << in1.read() << "  value2 read = " << in2.read() << endl;
	wait();
	cout << "Waited one cycle\n" << endl;
      }
      i++;
    }
  }
};

SC_MODULE( asyncproc )
{
  SC_HAS_PROCESS( asyncproc );

  const sc_signal<int>& in;
  sc_signal<int>& out;
  sc_in<bool> clock;

  asyncproc(sc_module_name NAME,
	    const sc_signal<int>& IN_,
	    sc_signal<int>& OUT_,
	    sc_signal_in_if<bool>& CLOCK)
    : in(IN_), out(OUT_)
  {
    out = 0;
    clock(CLOCK);
    SC_THREAD( entry );
    sensitive << clock.pos();
  }

  void entry()
  {
    wait();
    while (true) {
      if (clock.posedge()) {
	out = in;
	cout << "AsyncProc: Value read = " << in.read() << endl;
      }
      else {
	cout << "Error" << endl;
      }
      wait();
    }
  }
};

SC_MODULE( asyncblock )
{
  SC_HAS_PROCESS( asyncblock );

  const sc_signal<int>& in;
  sc_signal<int>& out;
  sc_in<bool> clock;

  asyncblock(sc_module_name NAME,
	     const sc_signal<int>& IN_,
	     sc_signal<int>& OUT_,
	     sc_signal_in_if<bool>& CLOCK)
    : in(IN_), out(OUT_)
  {
    clock(CLOCK);
    out = 0;
    SC_METHOD( entry );
    sensitive << clock;
  }

  void entry()
  {
    if (clock.posedge()) {
      out = in;
      cout << "AsyncBlock: Value read = " << in.read() << endl;
    }
    else {
      cout << "Seen other edge" << endl;
    }
  }
};


int
sc_main(int ac, char *av[])
{
  sc_signal<int> a, b, c;

  sc_clock clock("Clock", 20, SC_NS, 0.5);

  syncproc P1("P1", clock, a, b, c);
  asyncproc P2("P2", c, a, clock);
  asyncblock P3("P3", c, b, clock);

  sc_trace_file *tf = sc_create_vcd_trace_file("systemc");
  tf->set_time_unit(1, SC_NS);
  sc_trace(tf, a, "SYNC-IN1");
  sc_trace(tf, b, "SYNC-IN2");
  sc_trace(tf, c, "SYNC2-OUT");
  sc_trace(tf, clock, "Clock");

  sc_start(160, SC_NS);
  return 0;

}