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[/] [present/] [trunk/] [Decode/] [rtl/] [vhdl/] [PresentStateMachine.vhd] - Diff between revs 3 and 4

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-----------------------------------------------------------------------
 
----                                                               ----
 
---- 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:                                                  ----
 
----     State machine for Present encoder. For more informations  ----
 
---- 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 IEEE.STD_LOGIC_ARITH.ALL;
 
use IEEE.STD_LOGIC_UNSIGNED.ALL;
 
use IEEE.NUMERIC_STD.ALL;
 
use work.kody.ALL;
 
 
 
entity PresentStateMachine is
 
        generic (
 
                w_5 : integer := 5
 
        );
 
        port (
 
                clk, reset, start : in std_logic;
 
                ready, cnt_res, ctrl_mux, RegEn: out std_logic;
 
                num : in std_logic_vector (w_5-1 downto 0)
 
        );
 
end PresentStateMachine;
 
 
 
architecture Behavioral of PresentStateMachine is
 
 
 
        signal state : stany;
 
        signal next_state : stany;
 
 
 
        begin
 
                States : process(state, start, num)
 
                        begin
 
                                case state is
 
                                    ---- Waiting for start
 
                                        when NOP =>
 
                                                ready <= '0';
 
                                                cnt_res <= '0';
 
                                                ctrl_mux <= '0';
 
                                                RegEn <= '0';
 
                                                if (start = '1') then
 
                                                        next_state <= SM_START;
 
                                                else
 
                                                        next_state <= NOP;
 
                                                end if;
 
                                        -- Decoding
 
                                        when SM_START =>
 
                                                ready <= '0';
 
                                                RegEn <= '1';
 
                                                cnt_res <= '1';
 
                                                if (start = '1') then
 
                                                    -- control during first start
 
                                                        if (num = "00000") then
 
                                                                ctrl_mux <= '0';
 
                                                                next_state <= SM_START;
 
                                                        -- last iteration
 
                                                        elsif (num = "11111") then
 
                                                                ctrl_mux <= '1';
 
                                                                next_state <= SM_READY;
 
                                                        -- rest iterations
 
                                                        else
 
                                                                ctrl_mux <= '1';
 
                                                                next_state <= SM_START;
 
                                                        end if;
 
                                                else
 
                                                        ctrl_mux <= '0';
 
                                                        next_state <= NOP;
 
                                                end if;
 
                                        -- Decoding end
 
                                        when SM_READY =>
 
                                                cnt_res <= '0';
 
                                                RegEn <= '0';
 
                                                ready <= '1';
 
                                                if (start = '1') then
 
                                                        ctrl_mux <= '1';
 
                                                        next_state <= SM_READY;
 
                                                else
 
                                                        ctrl_mux <= '0';
 
                                                        next_state <= NOP;
 
                                                end if;
 
                                end case;
 
                end process States;
 
 
 
                SM : process (clk, reset)
 
                        begin
 
                                if (reset = '1') then
 
                                        state <= NOP;
 
                                elsif (clk'Event and clk = '1') then
 
                                        state <= next_state;
 
                                end if;
 
                        end process SM;
 
 
 
        end Behavioral;
 
 
 
 
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