usb1_transceiver.v

USB v1.1 RTL and design specification

/////////////////////////////////////////////////////////////////////
////                                                             ////
////  USB 1.1 function IP transceiver                            ////
////                                                             ////
////                                                             ////
////  Author: Steve Chou                                         ////
////          [e-mail]                                 ////
////                                                             ////
////                                                             ////
////  Downloaded from: http://www.opencores.org/cores/usb1_funct/////
////                                                             ////
/////////////////////////////////////////////////////////////////////
////                                                             ////
//// Copyright (C) 2004-2004 Steve Chou                          ////
////                         www.edaking.com                     ////
////                         [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.                                 ////
////                                                             ////
/////////////////////////////////////////////////////////////////////

//  CVS Log
//
//  $Id: usb1_transceiver.v,v 1.0 2004/02/22 23:01:55 Steve Chou Exp $
//
//  $Date: 2004/02/22 23:01:55 $
//  $Revision: 1.0 $
//  $Author: Steve Chou $
//  $Locker:  $
//  $State: Exp $
//
// Change History:
//               $Log: usb1_transceiver.v,v $
//               Revision 1.0  2004/02/22 23:01:55 Steve Chou
//
//
//
//
//
//
//
//

`include "usb1_defines.v"


module usb1_transceiver (

	dp, dn,

	tx_dp, tx_dn, tx_oe,
	rx_d, rx_dp, rx_dn);

inout dp;
inout dn;
input tx_dp;
input tx_dn;
input tx_oe;
output rx_d;
output rx_dp;
output rx_dn;

wire dp;
wire dn;
wire tx_dp;
wire tx_dn;
wire tx_oe;
wire rx_d;
wire rx_dp;
wire rx_dn;

	assign dp = tx_oe ? 1'bz : tx_dp;
	assign dn = tx_oe ? 1'bz : tx_dn;
	assign rx_d = dp;
	assign rx_dp = dp;
	assign rx_dn = dn;

endmodule