usb_phy.cpp

这是usb1.1协议,对于了解通用串行总线有很好的帮助,

/////////////////////////////////////////////////////////////////////
////                                                             ////
////  USB PHY                                                    ////
////                                                             ////
////  SystemC Version: usb_phy.cpp                               ////
////  Author: Alfredo Luiz Foltran Fialho                        ////
////          [e-mail]                                ////
////                                                             ////
////                                                             ////
/////////////////////////////////////////////////////////////////////
////                                                             ////
//// Verilog Version: usb_phy.v                                  ////
//// Copyright (C) 2000-2002 Rudolf Usselmann                    ////
////                         www.asics.ws                        ////
////                         [e-mail]                       ////
////                                                             ////
//// 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_phy.h"

void usb_phy::reset_up(void) {
	reset.write(rst.read() && !usb_rst.read());
}

void usb_phy::rst_cnt_up(void) {
	if (!rst.read())
		rst_cnt.write(0);
	else if (LineState_o.read() != 0)
		rst_cnt.write(0);
	else if (!usb_rst.read() && fs_ce.read())
		rst_cnt.write(rst_cnt.read() + 1);
}

void usb_phy::usb_rst_up(void) {
	usb_rst.write(rst_cnt.read() == 31);
}
/*
usb_phy::~usb_phy(void) {
	if (i_tx_phy)
		delete i_tx_phy;
	if (i_rx_phy)
		delete i_rx_phy;
}
*/