//-----------------------------------------------------------------------------
// Title         : Top-Level Verilog for Spartan-3 Starter Kit
// Project       : ECE 491 - Senior Design Project
//-----------------------------------------------------------------------------
// File          : s3board.v
// Author        : John Nestor  <nestorj@lafayette.edu>
// Created       : 09.08.2004
// Last modified : 08.04.2005
//-----------------------------------------------------------------------------
// Description :
// This file defines the input and output ports used to interface between the
// different I/O devices on the Xilinx/Digilent Spartan-3 Starter Kit board.
// Use this file along with constraints file "s3board.ucf" as a "wrapper" for
// your designs by instantiating submodules inside this module.
//
// Note: unused ports must be "commented out" in the constraints file in
// order for the design to compile and download properly.  All of these
// ports are initally commented out in the original s3board.ucf file.
// You will need to remove the "#" comment character at the beginning of
// each port that you are using.
//
// Ports currently excluded: VGA port, PS/2 port, SRAM
//
//-----------------------------------------------------------------------------
// Modification history :
// 11.08.2004 : created
// 04.08.2005 : Modified port names for 7-segment output
// 21.08.2005 : Slight changes to declarations
//-----------------------------------------------------------------------------

module s3board( clk, pb_in, sw_in, digit_enable_out, segment_out,
		segment_dp_out,	led_out, rxd_in, txd_out );

   input 	clk;                // 50MHz clock from board
   input  [3:0]	pb_in;              // active-high pushbuttons (BTN3-BTN0)
   input  [7:0] sw_in;              // active-high slide switches (SW7-SW0)
   output [3:0] digit_enable_out;   // active-low enable for the four
                                    // 7-seg display units (AN3-AN0)
   output [6:0] segment_out;        // active-low segments a (6) - g (0) -
                                    // shared between the four displays
   output 	segment_dp_out;     // active-low segment decimal point -
                                    // shared between the four displays
   output [7:0] led_out;            // 8 active-high LEDs (LD7-LD0)
   input 	rxd_in;             // RS-232 port data in
   output 	txd_out;            // RS-232 port data out
 	


   //---------------------------------------------------------------------------
   //  Add signal declarations here
   //---------------------------------------------------------------------------
   

   //---------------------------------------------------------------------------
   //  Add module instantiations and/or behavioral code here
   //---------------------------------------------------------------------------
   

endmodule // s3board