Subversion Repositories openrisc_me

// ----------------------------------------------------------------------------

// SystemC reset signal generator

// Copyright (C) 2008  Embecosm Limited <info@embecosm.com>

// Contributor Jeremy Bennett <jeremy.bennett@embecosm.com>

// This file is part of the cycle accurate model of the OpenRISC 1000 based

// system-on-chip, ORPSoC, built using Verilator.

// This program is free software: you can redistribute it and/or modify it

// under the terms of the GNU Lesser General Public License as published by

// the Free Software Foundation, either version 3 of the License, or (at your

// option) any later version.

// This program is distributed in the hope that it will be useful, but WITHOUT

// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public

// License for more details.

// You should have received a copy of the GNU Lesser General Public License

// along with this program.  If not, see <http://www.gnu.org/licenses/>.

// ----------------------------------------------------------------------------

// $Id: ResetSC.cpp 286 2009-02-03 11:19:30Z jeremy $

#include "ResetSC.h"

SC_HAS_PROCESS( ResetSC );

//! Constructor for the reset generator

//! @param name          Name of this module, passed to the parent

//!                      constructor.

//! @param resetCounter  Number of cycles of reset to provide.

ResetSC::ResetSC (sc_core::sc_module_name  name,

                  int                      _resetCounter) :

  sc_module (name),

  resetCounter (_resetCounter)

{

  SC_METHOD (driveReset);

  sensitive << clk.neg();

}       // ResetSC ()

//! Method to drive the reset port (active low). We will be called as an

//! initialization, which can be used to drive the reset low.

void

ResetSC::driveReset()

{

  if (resetCounter > 0)

    {

      rst  = 1;

      rstn = 0;

      resetCounter--;

    }

  else

    {

      rst  = 0;

      rstn = 1;

    }

}       // driveReset()