Subversion Repositories usb11

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

////                                                             ////

////  USB CRC16                                                  ////

////                                                             ////

////  SystemC Version: usb_crc16.cpp                             ////

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

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

////                                                             ////

////                                                             ////

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

////                                                             ////

//// Verilog Version: usb1_crc16.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.                                 ////

////                                                             ////

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

#include "systemc.h"

#include "usb_crc16.h"

void usb_crc16::update(void) {

        sc_uint<16> temp;

        temp[0] = din.read()[7] ^ din.read()[6] ^ din.read()[5] ^ din.read()[4] ^ din.read()[3] ^ din.read()[2] ^

                        din.read()[1] ^ din.read()[0] ^ crc_in.read()[8] ^ crc_in.read()[9] ^ crc_in.read()[10] ^

                        crc_in.read()[11] ^ crc_in.read()[12] ^ crc_in.read()[13] ^ crc_in.read()[14] ^

                        crc_in.read()[15];

        temp[1] = din.read()[7] ^ din.read()[6] ^ din.read()[5] ^ din.read()[4] ^ din.read()[3] ^ din.read()[2] ^

                        din.read()[1] ^ crc_in.read()[9] ^ crc_in.read()[10] ^ crc_in.read()[11] ^ crc_in.read()[12] ^

                        crc_in.read()[13] ^ crc_in.read()[14] ^ crc_in.read()[15];

        temp[2] = din.read()[1] ^ din.read()[0] ^ crc_in.read()[8] ^ crc_in.read()[9];

        temp[3] = din.read()[2] ^ din.read()[1] ^ crc_in.read()[9] ^ crc_in.read()[10];

        temp[4] = din.read()[3] ^ din.read()[2] ^ crc_in.read()[10] ^ crc_in.read()[11];

        temp[5] = din.read()[4] ^ din.read()[3] ^ crc_in.read()[11] ^ crc_in.read()[12];

        temp[6] = din.read()[5] ^ din.read()[4] ^ crc_in.read()[12] ^ crc_in.read()[13];

        temp[7] = din.read()[6] ^ din.read()[5] ^ crc_in.read()[13] ^ crc_in.read()[14];

        temp[8] = din.read()[7] ^ din.read()[6] ^ crc_in.read()[0] ^ crc_in.read()[14] ^ crc_in.read()[15];

        temp[9] = din.read()[7] ^ crc_in.read()[1] ^ crc_in.read()[15];

        temp[10] = crc_in.read()[2];

        temp[11] = crc_in.read()[3];

        temp[12] = crc_in.read()[4];

        temp[13] = crc_in.read()[5];

        temp[14] = crc_in.read()[6];

        temp[15] = din.read()[7] ^ din.read()[6] ^ din.read()[5] ^ din.read()[4] ^ din.read()[3] ^

                        din.read()[2] ^ din.read()[1] ^ din.read()[0] ^ crc_in.read()[7] ^ crc_in.read()[8] ^

                        crc_in.read()[9] ^ crc_in.read()[10] ^ crc_in.read()[11] ^ crc_in.read()[12] ^

                        crc_in.read()[13] ^ crc_in.read()[14] ^ crc_in.read()[15];

        crc_out.write(temp);

}