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/////////////////////////////////////////////////////////////////////

////                                                             ////

////  USB Fast FIFO - 2 Entries Deep                             ////

////                                                             ////

////  SystemC Version: usb_fifo2.h                               ////

////  Author: Alfredo Luiz Foltran Fialho                        ////

////          alfoltran@ig.com.br                                ////

////                                                             ////

////                                                             ////

/////////////////////////////////////////////////////////////////////

////                                                             ////

//// Verilog Version: usb1_fifo2.v                               ////

//// Copyright (C) 2000-2002 Rudolf Usselmann                    ////

////                         www.asics.ws                        ////

////                         rudi@asics.ws                       ////

////                                                             ////

//// This source file may be used and distributed without        ////

//// restriction provided that this copyright statement is not   ////

//// removed from the file and that any derivative work contains ////

//// the original copyright notice and the associated disclaimer.////

////                                                             ////

////     THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY     ////

//// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED   ////

//// TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS   ////

//// FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL THE AUTHOR      ////

//// OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,         ////

//// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES    ////

//// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE   ////

//// GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR        ////

//// BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF  ////

//// LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT  ////

//// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT  ////

//// OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE         ////

//// POSSIBILITY OF SUCH DAMAGE.                                 ////

////                                                             ////

/////////////////////////////////////////////////////////////////////

#ifndef USB_FIFO2_H

#define USB_FIFO2_H

SC_MODULE(usb_fifo2) {

  public:

        sc_in<bool>                     clk;

        sc_in<bool>                     rst;

        sc_in<bool>                     clr;

        sc_in<sc_uint<8> >      din;

        sc_in<bool>                     we;

        sc_out<sc_uint<8> >     dout;

        sc_in<bool>                     re;

        // Local Signals

        sc_uint<8>              mem[2];

        sc_signal<bool> wp;

        sc_signal<bool> rp;

        // Write and Read Pointers Update Functions

        void wp_update(void);

        void rp_update(void);

        // Write and Read FIFO Functions

        void write(void);

        void read(void);

        SC_CTOR(usb_fifo2) {

                SC_METHOD(wp_update);

                sensitive << clk.pos() << rst.neg();

                SC_METHOD(rp_update);

                sensitive << clk.pos() << rst.neg();

                SC_METHOD(write);

                sensitive << clk.pos();

                SC_METHOD(read);

                sensitive << rp << wp;

        }

};

#endif