| Line 1... |
Line 1... |
|
-----------------------------------------------------------------------
|
|
---- ----
|
|
---- Present - a lightweight block cipher project ----
|
|
---- ----
|
|
---- This file is part of the Present - a lightweight block ----
|
|
---- cipher project ----
|
|
---- http://www.http://opencores.org/project,present ----
|
|
---- ----
|
|
---- Description: ----
|
|
---- This is not "strict" implementation of multiplexer but ----
|
|
---- contains its functionality. There are two inputs. One - ----
|
|
---- 32 bit input, and one 64 bit input - because of way, in which ----
|
|
---- Present is working. For more information see below ----
|
|
---- To Do: ----
|
|
---- ----
|
|
---- Author(s): ----
|
|
---- - Krzysztof Gajewski, gajos@opencores.org ----
|
|
---- k.gajewski@gmail.com ----
|
|
---- ----
|
|
-----------------------------------------------------------------------
|
|
---- ----
|
|
---- Copyright (C) 2013 Authors and OPENCORES.ORG ----
|
|
---- ----
|
|
---- 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 source file is free software; you can redistribute it ----
|
|
---- and-or modify it under the terms of the GNU Lesser General ----
|
|
---- Public License as published by the Free Software Foundation; ----
|
|
---- either version 2.1 of the License, or (at your option) any ----
|
|
---- later version. ----
|
|
---- ----
|
|
---- This source is distributed in the hope that it will be ----
|
|
---- useful, but WITHOUT ANY WARRANTY; without even the implied ----
|
|
---- warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR ----
|
|
---- PURPOSE. See the GNU Lesser General Public License for more ----
|
|
---- details. ----
|
|
---- ----
|
|
---- You should have received a copy of the GNU Lesser General ----
|
|
---- Public License along with this source; if not, download it ----
|
|
---- from http://www.opencores.org/lgpl.shtml ----
|
|
---- ----
|
|
-----------------------------------------------------------------------
|
|
library IEEE;
|
|
use IEEE.STD_LOGIC_1164.ALL;
|
|
use work.kody.ALL;
|
|
|
|
-- Uncomment the following library declaration if using
|
|
-- arithmetic functions with Signed or Unsigned values
|
|
--use IEEE.NUMERIC_STD.ALL;
|
|
|
|
-- Uncomment the following library declaration if instantiating
|
|
-- any Xilinx primitives in this code.
|
|
--library UNISIM;
|
|
--use UNISIM.VComponents.all;
|
|
|
|
entity mux64 is
|
|
generic (
|
|
w_2 : integer := 2;
|
|
w_32 : integer := 32;
|
|
w_64 : integer := 64
|
|
);
|
|
port(
|
|
i0ctrl : in std_logic_vector (w_2-1 downto 0);
|
|
input0 : in std_logic_vector(w_32-1 downto 0);
|
|
input1 : in std_logic_vector(w_64-1 downto 0);
|
|
ctrl, clk, reset : in std_logic;
|
|
output : inout std_logic_vector(w_64-1 downto 0)
|
|
);
|
|
end mux64;
|
|
|
|
architecture Behavioral of mux64 is
|
|
|
|
begin
|
|
inne : process (clk, reset)
|
|
begin
|
|
if (reset = '1') then
|
|
output <= (others => '0');
|
|
elsif (clk'Event and clk = '1') then
|
|
if ctrl = '0' then
|
|
-- load least significant 32 bits of output from input0 (32 bit wide)
|
|
if (i0ctrl = in_ld_reg_L ) then
|
|
output <= output(w_64-1 downto 32) & input0;
|
|
-- load most significant 32 bits of output from input0 (32 bit wide)
|
|
elsif (i0ctrl = in_ld_reg_H) then
|
|
output <= input0 & output(31 downto 0);
|
|
else
|
|
-- do nothing
|
|
output <= output;
|
|
end if;
|
|
-- on output goes data from 64 bit input
|
|
else
|
|
output <= input1;
|
|
end if;
|
|
end if;
|
|
end process inne;
|
|
end Behavioral;
|
|
|
|
|
No newline at end of file
|
No newline at end of file
|
