head 1.4; access; symbols version_1_1:1.3 okinawa_1:1.1.1.1 VSFR_1:1.1.1.1 Vectra:1.1.1; locks; strict; comment @# @; 1.4 date 2008.06.26.06.12.29; author arif_endro; state Exp; branches; next 1.3; commitid 7c4d486333494567; 1.3 date 2005.03.04.08.06.16; author arif_endro; state Exp; branches; next 1.2; 1.2 date 2005.02.21.06.54.36; author arif_endro; state Exp; branches; next 1.1; 1.1 date 2005.01.04.02.05.58; author arif_endro; state Exp; branches 1.1.1.1; next ; 1.1.1.1 date 2005.01.04.02.05.58; author arif_endro; state Exp; branches; next ; desc @@ 1.4 log @Update last bit output assignment method. @ text @-- $Id: adder_15bit.vhdl,v 1.3 2005/03/04 08:06:16 arif_endro Exp $ ------------------------------------------------------------------------------- -- Title : Adder 15 bit -- Project : FM Receiver ------------------------------------------------------------------------------- -- File : adder_15bit.vhdl -- Author : "Arif E. Nugroho" -- Created : 2004/12/02 -- Last update : -- Simulators : -- Synthesizers: -- Target : ------------------------------------------------------------------------------- -- Description : Ripple carry adder 15 bit with output 16 bit ------------------------------------------------------------------------------- -- Copyright (C) 2004 Arif E. Nugroho -- This VHDL design file is an open design; you can redistribute it and/or -- modify it and/or implement it after contacting the author ------------------------------------------------------------------------------- ------------------------------------------------------------------------------- -- -- 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 BY THE AUTHOR ``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 THE AUTHOR 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. -- ------------------------------------------------------------------------------- library IEEE; use IEEE.STD_LOGIC_1164.ALL; entity adder_15bit is port ( addend_15bit : in bit_vector (14 downto 0); augend_15bit : in bit_vector (14 downto 0); adder15_output: out bit_vector (15 downto 0) -- 16 bit output ); end adder_15bit; architecture structural of adder_15bit 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 over15 : bit; signal adder15_output_int : bit_vector (14 downto 0); signal ov : bit; begin c00 <= '0'; over15 <= (addend_15bit (14) xor augend_15bit (14)); ov <= ((adder15_output_int (14) and over15) or (c15 and (not (over15)))); adder15_output(14 downto 00) <= adder15_output_int; adder15_output(15) <= ov; fa14 : fulladder port map ( addend => addend_15bit(14), augend => augend_15bit(14), carry_in => c14, sum => adder15_output_int(14), carry => c15 ); fa13 : fulladder port map ( addend => addend_15bit(13), augend => augend_15bit(13), carry_in => c13, sum => adder15_output_int(13), carry => c14 ); fa12 : fulladder port map ( addend => addend_15bit(12), augend => augend_15bit(12), carry_in => c12, sum => adder15_output_int(12), carry => c13 ); fa11 : fulladder port map ( addend => addend_15bit(11), augend => augend_15bit(11), carry_in => c11, sum => adder15_output_int(11), carry => c12 ); fa10 : fulladder port map ( addend => addend_15bit(10), augend => augend_15bit(10), carry_in => c10, sum => adder15_output_int(10), carry => c11 ); fa09 : fulladder port map ( addend => addend_15bit(09), augend => augend_15bit(09), carry_in => c09, sum => adder15_output_int(09), carry => c10 ); fa08 : fulladder port map ( addend => addend_15bit(08), augend => augend_15bit(08), carry_in => c08, sum => adder15_output_int(08), carry => c09 ); fa07 : fulladder port map ( addend => addend_15bit(07), augend => augend_15bit(07), carry_in => c07, sum => adder15_output_int(07), carry => c08 ); fa06 : fulladder port map ( addend => addend_15bit(06), augend => augend_15bit(06), carry_in => c06, sum => adder15_output_int(06), carry => c07 ); fa05 : fulladder port map ( addend => addend_15bit(05), augend => augend_15bit(05), carry_in => c05, sum => adder15_output_int(05), carry => c06 ); fa04 : fulladder port map ( addend => addend_15bit(04), augend => augend_15bit(04), carry_in => c04, sum => adder15_output_int(04), carry => c05 ); fa03 : fulladder port map ( addend => addend_15bit(03), augend => augend_15bit(03), carry_in => c03, sum => adder15_output_int(03), carry => c04 ); fa02 : fulladder port map ( addend => addend_15bit(02), augend => augend_15bit(02), carry_in => c02, sum => adder15_output_int(02), carry => c03 ); fa01 : fulladder port map ( addend => addend_15bit(01), augend => augend_15bit(01), carry_in => c01, sum => adder15_output_int(01), carry => c02 ); fa00 : fulladder port map ( addend => addend_15bit(00), augend => augend_15bit(00), carry_in => c00, sum => adder15_output_int(00), carry => c01 ); end structural; @ 1.3 log @*** empty log message *** @ text @d1 1 a1 1 -- $Id: adder_15bit.vhdl,v 1.2 2005/02/21 06:54:36 arif_endro Exp $ d83 2 a84 1 signal adder15_output_int : bit_vector (15 downto 0); d90 1 a90 1 adder15_output_int (15) <= ((adder15_output_int (14) and over15) or d92 2 a93 1 adder15_output <= adder15_output_int; @ 1.2 log @Update License @ text @d1 1 a1 1 -- $Id: adder_15bit.vhdl,v 1.1.1.1 2005/01/04 02:05:58 arif_endro Exp $ a43 1 use IEEE.STD_LOGIC_arith.ALL; @ 1.1 log @Initial revision @ text @d1 1 a1 1 -- $Id$ d10 1 a10 1 -- Simulators : Modelsim 6.0/Windows98 d16 1 a16 1 -- Copyright (c) 2004 Arif E. Nugroho d20 21 @ 1.1.1.1 log @Initial releases @ text @@