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-- ------------------------------------------------------------------------

-- Copyright (C) 2004 Arif Endro Nugroho

-- All rights reserved.

-- 

-- Redistribution and use in source and binary forms, with or without

-- modification, are permitted provided that the following conditions

-- are met:

-- 

-- 1. Redistributions of source code must retain the above copyright

--    notice, this list of conditions and the following disclaimer.

-- 2. Redistributions in binary form must reproduce the above copyright

--    notice, this list of conditions and the following disclaimer in the

--    documentation and/or other materials provided with the distribution.

-- 

-- THIS SOFTWARE IS PROVIDED BY ARIF ENDRO NUGROHO "AS IS" AND ANY EXPRESS

-- OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

-- WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE

-- DISCLAIMED. IN NO EVENT SHALL ARIF ENDRO NUGROHO BE LIABLE FOR ANY

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-- DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

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-- End Of License.

-- ------------------------------------------------------------------------

library IEEE;

use IEEE.STD_LOGIC_1164.ALL;

entity adder_16bit_u is

   port (

      addend_16bit  : in  bit_vector (15 downto 0);

      augend_16bit  : in  bit_vector (15 downto 0);

      adder16_output: out bit_vector (15 downto 0)

      );

end adder_16bit_u;

architecture structural of adder_16bit_u is

   component fulladder

      port (

      addend        : in   bit;

      augend        : in   bit;

      carry_in      : in   bit;

      sum           : out  bit;

      carry         : out  bit

      );

   end component;

-- internal signal

signal c00 : bit;

signal c01 : bit;

signal c02 : bit;

signal c03 : bit;

signal c04 : bit;

signal c05 : bit;

signal c06 : bit;

signal c07 : bit;

signal c08 : bit;

signal c09 : bit;

signal c10 : bit;

signal c11 : bit;

signal c12 : bit;

signal c13 : bit;

signal c14 : bit;

signal c15 : bit;

signal c16 : bit;

begin

c00 <= '0';

fa15 : fulladder

   port map (

      addend     => addend_16bit(15),

      augend     => augend_16bit(15),

      carry_in   => c15,

      sum        => adder16_output(15),

      carry      => c16

      );

fa14 : fulladder

   port map (

      addend     => addend_16bit(14),

      augend     => augend_16bit(14),

      carry_in   => c14,

      sum        => adder16_output(14),

      carry      => c15

      );

fa13 : fulladder

   port map (

      addend     => addend_16bit(13),

      augend     => augend_16bit(13),

      carry_in   => c13,

      sum        => adder16_output(13),

      carry      => c14

      );

fa12 : fulladder

   port map (

      addend     => addend_16bit(12),

      augend     => augend_16bit(12),

      carry_in   => c12,

      sum        => adder16_output(12),

      carry      => c13

      );

fa11 : fulladder

   port map (

      addend     => addend_16bit(11),

      augend     => augend_16bit(11),

      carry_in   => c11,

      sum        => adder16_output(11),

      carry      => c12

      );

fa10 : fulladder

   port map (

      addend     => addend_16bit(10),

      augend     => augend_16bit(10),

      carry_in   => c10,

      sum        => adder16_output(10),

      carry      => c11

      );

fa09 : fulladder

   port map (

      addend     => addend_16bit(09),

      augend     => augend_16bit(09),

      carry_in   => c09,

      sum        => adder16_output(09),

      carry      => c10

      );

fa08 : fulladder

   port map (

      addend     => addend_16bit(08),

      augend     => augend_16bit(08),

      carry_in   => c08,

      sum        => adder16_output(08),

      carry      => c09

      );

fa07 : fulladder

   port map (

      addend     => addend_16bit(07),

      augend     => augend_16bit(07),

      carry_in   => c07,

      sum        => adder16_output(07),

      carry      => c08

      );

fa06 : fulladder

   port map (

      addend     => addend_16bit(06),

      augend     => augend_16bit(06),

      carry_in   => c06,

      sum        => adder16_output(06),

      carry      => c07

      );

fa05 : fulladder

   port map (

      addend     => addend_16bit(05),

      augend     => augend_16bit(05),

      carry_in   => c05,

      sum        => adder16_output(05),

      carry      => c06

      );

fa04 : fulladder

   port map (

      addend     => addend_16bit(04),

      augend     => augend_16bit(04),

      carry_in   => c04,

      sum        => adder16_output(04),

      carry      => c05

      );

fa03 : fulladder

   port map (

      addend     => addend_16bit(03),

      augend     => augend_16bit(03),

      carry_in   => c03,

      sum        => adder16_output(03),

      carry      => c04

      );

fa02 : fulladder

   port map (

      addend     => addend_16bit(02),

      augend     => augend_16bit(02),

      carry_in   => c02,

      sum        => adder16_output(02),

      carry      => c03

      );

fa01 : fulladder

   port map (

      addend     => addend_16bit(01),

      augend     => augend_16bit(01),

      carry_in   => c01,

      sum        => adder16_output(01),

      carry      => c02

      );

fa00 : fulladder

   port map (

      addend     => addend_16bit(00),

      augend     => augend_16bit(00),

      carry_in   => c00,

      sum        => adder16_output(00),

      carry      => c01

      );

end structural;