/******************************************************************************/ 
/*                                                                            */ 
/* Copyright (c) 1999 Sun Microsystems, Inc. All rights reserved.             */ 
/*                                                                            */ 
/* The contents of this file are subject to the current version of the Sun    */ 
/* Community Source License, microSPARCII ("the License"). You may not use    */ 
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/* foreign patents, or pending applications.                                  */ 
/*                                                                            */ 
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/*                                                                            */ 
/******************************************************************************/ 
/***************************************************************************
****************************************************************************
***
***  Program File:  @(#)add3.v
***
****************************************************************************
****************************************************************************/

//  @(#)add3.v	1.1  4/8/92
//
// **************************************************************
//  add3 -- 3 to 2 compression adder cell
// **************************************************************


module add3(s, c, cout, x1, x2, x3, cin);
    //prop CELLCLASS "LEAF"
    //prop AREA 0.0 0.0 100.0 100.0

    //prop FEEDTHROUGH "feed0" 90.0 0.0
    //prop FEEDTHROUGH "feed1" 70.0 0.0
    //prop FEEDTHROUGH "feed2" 50.0 0.0
    //prop FEEDTHROUGH "feed3" 30.0 0.0
    //prop FEEDTHROUGH "feed4" 10.0 0.0

    output s;
	//prop LOCATION 60.0 0.0 60.0 0.0 "MET2"
    output c;
	//prop LOCATION 40.0 0.0 40.0 0.0 "MET2"
    output cout;
	//prop LOCATION 0.0 50.0 0.0 50.0 "MET1"

    input  x1;
	//prop LOCATION 80.0 100.0 80.0 100.0 "MET2"
    input  x2;
	//prop LOCATION 60.0 100.0 60.0 100.0 "MET2"
    input  x3;
	//prop LOCATION 40.0 100.0 40.0 100.0 "MET2"
    input  cin;
	//prop LOCATION 100.0 50.0 100.0 50.0 "MET1"

    // cout
    or  (or1, x1, x2);
    and (cout, or1, x3);

    // s1
    xor (xor1, x1, x2);
    xor (s1, xor1, x3);

    // S
    xor (s, s1, cin);

    // c1
    and (and1, x1, x2);

    // c
    and (and3, s1, cin);
    not (s1_, s1);
    and (and4, s1_, and1);
    or  (c, and3, and4);

endmodule