| 1 |
3 |
JonasDC |
----------------------------------------------------------------------
|
| 2 |
|
|
---- cell_1b_adder ----
|
| 3 |
|
|
---- ----
|
| 4 |
|
|
---- This file is part of the ----
|
| 5 |
|
|
---- Modular Simultaneous Exponentiation Core project ----
|
| 6 |
|
|
---- http://www.opencores.org/cores/mod_sim_exp/ ----
|
| 7 |
|
|
---- ----
|
| 8 |
|
|
---- Description ----
|
| 9 |
|
|
---- This file contains the implementation of a 1-bit full ----
|
| 10 |
|
|
---- adder cell using logic gates ----
|
| 11 |
|
|
---- used in adder_block ----
|
| 12 |
|
|
---- ----
|
| 13 |
|
|
---- Dependencies: none ----
|
| 14 |
|
|
---- ----
|
| 15 |
|
|
---- Authors: ----
|
| 16 |
|
|
---- - Geoffrey Ottoy, DraMCo research group ----
|
| 17 |
|
|
---- - Jonas De Craene, JonasDC@opencores.org ----
|
| 18 |
|
|
---- ----
|
| 19 |
|
|
----------------------------------------------------------------------
|
| 20 |
|
|
---- ----
|
| 21 |
|
|
---- Copyright (C) 2011 DraMCo research group and OPENCORES.ORG ----
|
| 22 |
|
|
---- ----
|
| 23 |
|
|
---- This source file may be used and distributed without ----
|
| 24 |
|
|
---- restriction provided that this copyright statement is not ----
|
| 25 |
|
|
---- removed from the file and that any derivative work contains ----
|
| 26 |
|
|
---- the original copyright notice and the associated disclaimer. ----
|
| 27 |
|
|
---- ----
|
| 28 |
|
|
---- This source file is free software; you can redistribute it ----
|
| 29 |
|
|
---- and/or modify it under the terms of the GNU Lesser General ----
|
| 30 |
|
|
---- Public License as published by the Free Software Foundation; ----
|
| 31 |
|
|
---- either version 2.1 of the License, or (at your option) any ----
|
| 32 |
|
|
---- later version. ----
|
| 33 |
|
|
---- ----
|
| 34 |
|
|
---- This source is distributed in the hope that it will be ----
|
| 35 |
|
|
---- useful, but WITHOUT ANY WARRANTY; without even the implied ----
|
| 36 |
|
|
---- warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR ----
|
| 37 |
|
|
---- PURPOSE. See the GNU Lesser General Public License for more ----
|
| 38 |
|
|
---- details. ----
|
| 39 |
|
|
---- ----
|
| 40 |
|
|
---- You should have received a copy of the GNU Lesser General ----
|
| 41 |
|
|
---- Public License along with this source; if not, download it ----
|
| 42 |
|
|
---- from http://www.opencores.org/lgpl.shtml ----
|
| 43 |
|
|
---- ----
|
| 44 |
|
|
----------------------------------------------------------------------
|
| 45 |
2 |
JonasDC |
|
| 46 |
3 |
JonasDC |
library ieee;
|
| 47 |
|
|
use ieee.std_logic_1164.all;
|
| 48 |
|
|
use ieee.std_logic_arith.all;
|
| 49 |
|
|
use ieee.std_logic_unsigned.all;
|
| 50 |
2 |
JonasDC |
|
| 51 |
3 |
JonasDC |
|
| 52 |
2 |
JonasDC |
entity cell_1b_adder is
|
| 53 |
3 |
JonasDC |
port (
|
| 54 |
|
|
a : in std_logic;
|
| 55 |
|
|
mux_result : in std_logic;
|
| 56 |
|
|
cin : in std_logic;
|
| 57 |
|
|
cout : out std_logic;
|
| 58 |
|
|
r : out std_logic
|
| 59 |
|
|
);
|
| 60 |
2 |
JonasDC |
end cell_1b_adder;
|
| 61 |
|
|
|
| 62 |
3 |
JonasDC |
|
| 63 |
2 |
JonasDC |
architecture Behavioral of cell_1b_adder is
|
| 64 |
3 |
JonasDC |
signal a_xor_mux_result : std_logic;
|
| 65 |
2 |
JonasDC |
begin
|
| 66 |
3 |
JonasDC |
a_xor_mux_result <= a xor mux_result;
|
| 67 |
|
|
r <= a_xor_mux_result xor cin;
|
| 68 |
|
|
cout <= (a and mux_result) or (cin and a_xor_mux_result);
|
| 69 |
2 |
JonasDC |
end Behavioral;
|
