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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 of 'pure' Present decoder with RS-232       ----
---- communication with PC. Some names can be unclear because of   ----
---- the same type used as in PresentCommSM (in fact the same cycle----
---- 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 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 PresentDecodeCommSM is
        port (
                clk                             : in STD_LOGIC;
                reset                           : in STD_LOGIC;
                RDAsig                  : in STD_LOGIC;
                TBEsig                  : in STD_LOGIC;
                RDsig                           : out STD_LOGIC;
                WRsig                           : out STD_LOGIC;
                textDataEn     : out STD_LOGIC;
                textDataShift   : out STD_LOGIC;
                keyDataEn               : out STD_LOGIC;
                keyDataShift    : out STD_LOGIC;
                ciphDataEn     : out STD_LOGIC;
                ciphDataShift  : out STD_LOGIC;
                startSig                        : out STD_LOGIC;
                readySig                        : in STD_LOGIC
        );
end PresentDecodeCommSM;
 
architecture Behavioral of PresentDecodeCommSM is
 
-- counter used for determine number of readed/sended data (key, cipher, result)
component counter is
        generic (
                w_5 : integer := 5
        );
        port (
                clk, reset, cnt_res : in std_logic;
                num : out std_logic_vector (w_5-1 downto 0)
        );
end component counter;
 
-- signals
 
signal state      : stany_comm := NOP;
signal next_state : stany_comm := NOP;
 
-- modify for variable key size
signal serialDataCtrCt    : STD_LOGIC;
signal serialDataCtrOut   : STD_LOGIC_VECTOR(3 downto 0);
signal serialDataCtrReset : STD_LOGIC;
signal ctrReset                   : STD_LOGIC;
-- DO NOT MODIFY!!!
signal shiftDataCtrCt    : STD_LOGIC;
signal shiftDataCtrOut   : STD_LOGIC_VECTOR(2 downto 0);
 
begin
        ctrReset <= serialDataCtrReset or reset;
        SM : process(state, RDAsig, TBEsig, shiftDataCtrOut, serialDataCtrOut, readySig)
                begin
                        case state is
                            -- No operation - waiting for incoming data
                                when NOP =>
                                        RDsig                                    <= '0';
                                        WRsig                                    <= '0';
                                        textDataEn                       <= '0';
                                        textDataShift            <= '0';
                                        keyDataEn                        <= '0';
                                        keyDataShift             <= '0';
                                        ciphDataEn                       <= '0';
                                        ciphDataShift            <= '0';
                                        startSig                                 <= '0';
                                        serialDataCtrCt  <= '0';
                                        shiftDataCtrCt           <= '0';
                                        serialDataCtrReset <= '0';
                                        -- data has come
                                        if (RDAsig = '1') then
                                                next_state <= READ_DATA_TEXT;
                                        else
                                                next_state <= NOP;
                                        end if;
                                -- Cipher data enable and read data
                                when READ_DATA_TEXT =>
                                        RDsig                                    <= '1';
                                        WRsig                                    <= '0';
                                        textDataEn                       <= '1';
                                        textDataShift            <= '0';
                                        keyDataEn                        <= '0';
                                        keyDataShift             <= '0';
                                        ciphDataEn                       <= '0';
                                        ciphDataShift            <= '0';
                                        startSig                                 <= '0';
                                        -- counter of retrieved bytes
                                        serialDataCtrCt  <= '1';
                                        shiftDataCtrCt           <= '0';
                                        serialDataCtrReset <= '0';
                                        next_state <= DECODE_READ_TEXT;
                                -- Cipher data readed, stop counter and check if proper number of byte
                                -- was readed
                                when DECODE_READ_TEXT =>
                                        RDsig                                    <= '0';
                                        WRsig                                    <= '0';
                                        textDataEn                       <= '0';
                                        textDataShift            <= '0';
                                        keyDataEn                        <= '0';
                                        keyDataShift             <= '0';
                                        ciphDataEn                       <= '0';
                                        ciphDataShift            <= '0';
                                        startSig                                 <= '0';
                                        serialDataCtrCt  <= '0';
                                        shiftDataCtrCt           <= '0';
                                        -- 8 bytes should be readed
                                        if (serialDataCtrOut(3 downto 0) = "1000") then
                                            -- 8 bytes was readed
                                                next_state <= TEMP_STATE;
                                        else
                                            -- 8 bytes was not readed
                                                next_state <= MOVE_TEXT;
                                        end if;
                                -- Reset counter for next reading
                                when TEMP_STATE =>
                                        RDsig                                    <= '0';
                                        WRsig                                    <= '0';
                                        textDataEn                       <= '0';
                                        textDataShift            <= '0';
                                        keyDataEn                        <= '0';
                                        keyDataShift             <= '0';
                                        ciphDataEn                       <= '0';
                                        ciphDataShift            <= '0';
                                        startSig                                 <= '0';
                                        serialDataCtrCt  <= '0';
                                        shiftDataCtrCt           <= '0';
                                        serialDataCtrReset <= '1';
                                        next_state <= NOP_FOR_KEY;
                                -- Here data are shfted in shift register - another shift counter are used
                                when MOVE_TEXT =>
                                        RDsig                                    <= '0';
                                        WRsig                                    <= '0';
                                        textDataEn                       <= '0';
                                        textDataShift            <= '1';
                                        keyDataEn                        <= '0';
                                        keyDataShift             <= '0';
                                        ciphDataEn                       <= '0';
                                        ciphDataShift            <= '0';
                                        startSig                                 <= '0';
                                        serialDataCtrCt  <= '0';
                                        shiftDataCtrCt   <= '1';
                                        serialDataCtrReset <= '0';
                                        if (shiftDataCtrOut(2 downto 0) = "111") then
                                                next_state <= NOP;
                                        else
                                                next_state <= MOVE_TEXT;
                                        end if;
                                -- "No operation 2" waiting for data - it could be optimized in way,
                                -- that waiting for key and text could be the same state, but it was
                                -- intentionally separated.
                                when NOP_FOR_KEY        =>
                                        RDsig                                    <= '0';
                                        WRsig                                    <= '0';
                                        textDataEn                       <= '0';
                                        textDataShift            <= '0';
                                        keyDataEn                        <= '0';
                                        keyDataShift             <= '0';
                                        ciphDataEn                       <= '0';
                                        ciphDataShift            <= '0';
                                        startSig                                 <= '0';
                                        serialDataCtrCt  <= '0';
                                        shiftDataCtrCt           <= '0';
                                        serialDataCtrReset <= '0';
                                        -- data has come
                                        if (RDAsig = '1') then
                                                next_state <= READ_DATA_KEY;
                                        else
                                                next_state <= NOP_FOR_KEY;
                                        end if;
                                -- Key data enable and read data
                                when READ_DATA_KEY =>
                                        RDsig                                    <= '1';
                                        WRsig                                    <= '0';
                                        textDataEn                       <= '0';
                                        textDataShift            <= '0';
                                        keyDataEn                        <= '1';
                                        keyDataShift             <= '0';
                                        ciphDataEn                       <= '0';
                                        ciphDataShift            <= '0';
                                        startSig                                 <= '0';
                                        -- counter of retrieved bytes
                                        serialDataCtrCt  <= '1';
                                        shiftDataCtrCt           <= '0';
                                        serialDataCtrReset <= '0';
                                        next_state <= DECODE_READ_KEY;
                                -- Data readed, stop counter and check if proper number of byte
                                -- was readed
                                when DECODE_READ_KEY =>
                                        RDsig                                    <= '0';
                                        WRsig                                    <= '0';
                                        textDataEn                       <= '0';
                                        textDataShift            <= '0';
                                        keyDataEn                        <= '0';
                                        keyDataShift             <= '0';
                                        ciphDataEn                       <= '0';
                                        ciphDataShift            <= '0';
                                        startSig                                 <= '0';
                                        serialDataCtrCt  <= '0';
                                        shiftDataCtrCt           <= '0';
                                        serialDataCtrReset <= '0';
                                        -- 10 bytes should be readed
                                        if (serialDataCtrOut(3 downto 0) = "1010") then
                                            -- 10 bytes was readed
                                                next_state <= TEMP2_STATE;
                                        else
                                            -- 10 bytes was not readed
                                                next_state <= MOVE_KEY;
                                        end if;
                                -- Reset counter for next reading
                                when TEMP2_STATE =>
                                        RDsig                                    <= '0';
                                        WRsig                                    <= '0';
                                        textDataEn                       <= '0';
                                        textDataShift            <= '0';
                                        keyDataEn                        <= '0';
                                        keyDataShift             <= '0';
                                        ciphDataEn                       <= '0';
                                        ciphDataShift            <= '0';
                                        startSig                                 <= '0';
                                        serialDataCtrCt  <= '0';
                                        shiftDataCtrCt           <= '0';
                                        serialDataCtrReset <= '1';
                                        next_state <= PRESENT_ENCODE;
                                -- Here data are shfted in shift register - another shift counter are used
                                when MOVE_KEY =>
                                        RDsig                                    <= '0';
                                        WRsig                                    <= '0';
                                        textDataEn                       <= '0';
                                        textDataShift            <= '0';
                                        keyDataEn                        <= '0';
                                        keyDataShift             <= '1';
                                        ciphDataEn                       <= '0';
                                        ciphDataShift            <= '0';
                                        startSig                                 <= '0';
                                        serialDataCtrCt  <= '0';
                                        shiftDataCtrCt           <= '1';
                                        serialDataCtrReset <= '0';
                                        if (shiftDataCtrOut(2 downto 0) = "111") then
                                                next_state <= NOP_FOR_KEY;
                                        else
                                                next_state <= MOVE_KEY;
                                        end if;
                                -- All suitable data was readed Present encode start
                                when PRESENT_ENCODE =>
                                        RDsig                                    <= '0';
                                        WRsig                                    <= '0';
                                        textDataEn                       <= '0';
                                        textDataShift            <= '0';
                                        keyDataEn                        <= '0';
                                        keyDataShift             <= '0';
                                        ciphDataShift            <= '0';
                                        startSig                                 <= '1';
                                        serialDataCtrCt  <= '0';
                                        shiftDataCtrCt           <= '0';
                                        serialDataCtrReset <= '0';
                                        -- change state if Present result ready
                                        if (readySig = '1') then
                                                ciphDataEn                       <= '1';
                                                next_state <= WRITE_OUT;
                                        else
                                                ciphDataEn                       <= '0';
                                                next_state <= PRESENT_ENCODE;
                                        end if;
                                -- similar control of writing result as during reading
                                when WRITE_OUT =>
                                        RDsig                                    <= '0';
                                        textDataEn                       <= '0';
                                        textDataShift            <= '0';
                                        keyDataEn                        <= '0';
                                        keyDataShift             <= '0';
                                        ciphDataEn                       <= '0';
                                        ciphDataShift            <= '0';
                                        startSig                                 <= '1';
                                        serialDataCtrCt  <= '1';
                                        shiftDataCtrCt           <= '0';
                                        serialDataCtrReset <= '0';
                                        if (serialDataCtrOut = "1000") then
                                                WRsig                                    <= '0';
                                                next_state <= TEMP_OUT;
                                        else
                                                WRsig                                    <= '1';
                                                next_state <= MOVE_OUT;
                                        end if;
                                -- all data was sended - start new Present encode cycle
                                when TEMP_OUT =>
                                        RDsig                                    <= '0';
                                        WRsig                                    <= '0';
                                        textDataEn                       <= '0';
                                        textDataShift            <= '0';
                                        keyDataEn                        <= '0';
                                        keyDataShift             <= '0';
                                        ciphDataEn                       <= '0';
                                        ciphDataShift            <= '0';
                                        startSig                                 <= '1';
                                        serialDataCtrCt  <= '0';
                                        shiftDataCtrCt           <= '0';
                                        serialDataCtrReset <= '1';
                                        next_state <= NOP;
                                when MOVE_OUT =>
                                        if (TBEsig = '0') then
                                                RDsig                                    <= '0';
                                                WRsig                                    <= '0';
                                                textDataEn                       <= '0';
                                                textDataShift            <= '0';
                                                keyDataEn                        <= '0';
                                                keyDataShift             <= '0';
                                                ciphDataEn                       <= '0';
                                                ciphDataShift            <= '0';
                                                startSig                                 <= '1';
                                                serialDataCtrCt  <= '0';
                                                shiftDataCtrCt           <= '0';
                                                serialDataCtrReset <= '0';
                                                next_state <= MOVE_OUT;
                                        else
                                                RDsig                                    <= '0';
                                                WRsig                                    <= '0';
                                                textDataEn                       <= '0';
                                                textDataShift            <= '0';
                                                keyDataEn                        <= '0';
                                                keyDataShift             <= '0';
                                                ciphDataEn                       <= '0';
                                                ciphDataShift            <= '1';
                                                startSig                                 <= '1';
                                                serialDataCtrCt  <= '0';
                                                shiftDataCtrCt           <= '1';
                                                serialDataCtrReset <= '0';
                                                if (shiftDataCtrOut = "111") then
                                                        next_state <= WRITE_OUT;
                                                else
                                                        next_state <= MOVE_OUT;
                                                end if;
                                        end if;
                        end case;
                end process SM;
 
        state_modifier : process (clk, reset)
                begin
                   if (reset = '1') then
                                        state <= NOP;
                        elsif (clk = '1' and clk'Event) then
                                        state <= next_state;
                        end if;
                end process state_modifier;
 
    -- counter for controling number of bytes of readed data
        dataCounter : counter
                generic map(
                        w_5 => 4
                )
                port map (
                        cnt_res  => serialDataCtrCt,
                        num => serialDataCtrOut,
                        clk    => clk,
                        reset  => ctrReset
                );
 
        -- counter for controling number of shifted bits of readed data
        shiftCounter : counter
                generic map(
                        w_5 => 3
                )
                port map (
                        cnt_res  => shiftDataCtrCt,
                        num => shiftDataCtrOut,
                        clk    => clk,
                        reset  => reset
                );
 
end Behavioral;
 

Line No.	Rev	Author	Line
1	4	gajos	`-----------------------------------------------------------------------`
2			`---- ----`
3			`---- Present - a lightweight block cipher project ----`
4			`---- ----`
5			`---- This file is part of the Present - a lightweight block ----`
6			`---- cipher project ----`
7			`---- http://www.http://opencores.org/project,present ----`
8			`---- ----`
9			`---- Description: ----`
10			`---- State machine of 'pure' Present decoder with RS-232 ----`
11			`---- communication with PC. Some names can be unclear because of ----`
12			`---- the same type used as in PresentCommSM (in fact the same cycle----`
13			`---- For more informations see below. ----`
14			`---- To Do: ----`
15			`---- ----`
16			`---- Author(s): ----`
17			`---- - Krzysztof Gajewski, gajos@opencores.org ----`
18			`---- k.gajewski@gmail.com ----`
19			`---- ----`
20			`-----------------------------------------------------------------------`
21			`---- ----`
22			`---- Copyright (C) 2013 Authors and OPENCORES.ORG ----`
23			`---- ----`
24			`---- This source file may be used and distributed without ----`
25			`---- restriction provided that this copyright statement is not ----`
26			`---- removed from the file and that any derivative work contains ----`
27			`---- the original copyright notice and the associated disclaimer. ----`
28			`---- ----`
29			`---- This source file is free software; you can redistribute it ----`
30			`---- and-or modify it under the terms of the GNU Lesser General ----`
31			`---- Public License as published by the Free Software Foundation; ----`
32			`---- either version 2.1 of the License, or (at your option) any ----`
33			`---- later version. ----`
34			`---- ----`
35			`---- This source is distributed in the hope that it will be ----`
36			`---- useful, but WITHOUT ANY WARRANTY; without even the implied ----`
37			`---- warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR ----`
38			`---- PURPOSE. See the GNU Lesser General Public License for more ----`
39			`---- details. ----`
40			`---- ----`
41			`---- You should have received a copy of the GNU Lesser General ----`
42			`---- Public License along with this source; if not, download it ----`
43			`---- from http://www.opencores.org/lgpl.shtml ----`
44			`---- ----`
45			`-----------------------------------------------------------------------`
46	3	gajos	`library IEEE;`
47			`use IEEE.STD_LOGIC_1164.ALL;`
48			`use work.kody.ALL;`
49
50			`-- Uncomment the following library declaration if using`
51			`-- arithmetic functions with Signed or Unsigned values`
52			`--use IEEE.NUMERIC_STD.ALL;`
53
54			`-- Uncomment the following library declaration if instantiating`
55			`-- any Xilinx primitives in this code.`
56			`--library UNISIM;`
57			`--use UNISIM.VComponents.all;`
58
59			`entity PresentDecodeCommSM is`
60			`port (`
61			`clk : in STD_LOGIC;`
62			`reset : in STD_LOGIC;`
63			`RDAsig : in STD_LOGIC;`
64			`TBEsig : in STD_LOGIC;`
65			`RDsig : out STD_LOGIC;`
66			`WRsig : out STD_LOGIC;`
67			`textDataEn : out STD_LOGIC;`
68			`textDataShift : out STD_LOGIC;`
69			`keyDataEn : out STD_LOGIC;`
70			`keyDataShift : out STD_LOGIC;`
71			`ciphDataEn : out STD_LOGIC;`
72			`ciphDataShift : out STD_LOGIC;`
73			`startSig : out STD_LOGIC;`
74			`readySig : in STD_LOGIC`
75			`);`
76			`end PresentDecodeCommSM;`
77
78			`architecture Behavioral of PresentDecodeCommSM is`
79
80	4	gajos	`-- counter used for determine number of readed/sended data (key, cipher, result)`
81	3	gajos	`component counter is`
82			`generic (`
83			`w_5 : integer := 5`
84			`);`
85			`port (`
86			`clk, reset, cnt_res : in std_logic;`
87			`num : out std_logic_vector (w_5-1 downto 0)`
88			`);`
89			`end component counter;`
90
91	4	gajos	`-- signals`
92
93	3	gajos	`signal state : stany_comm := NOP;`
94			`signal next_state : stany_comm := NOP;`
95
96			`-- modify for variable key size`
97			`signal serialDataCtrCt : STD_LOGIC;`
98			`signal serialDataCtrOut : STD_LOGIC_VECTOR(3 downto 0);`
99			`signal serialDataCtrReset : STD_LOGIC;`
100			`signal ctrReset : STD_LOGIC;`
101			`-- DO NOT MODIFY!!!`
102			`signal shiftDataCtrCt : STD_LOGIC;`
103			`signal shiftDataCtrOut : STD_LOGIC_VECTOR(2 downto 0);`
104
105			`begin`
106			`ctrReset <= serialDataCtrReset or reset;`
107			`SM : process(state, RDAsig, TBEsig, shiftDataCtrOut, serialDataCtrOut, readySig)`
108			`begin`
109	4	gajos	`case state is`
110			`-- No operation - waiting for incoming data`
111	3	gajos	`when NOP =>`
112			`RDsig <= '0';`
113			`WRsig <= '0';`
114			`textDataEn <= '0';`
115			`textDataShift <= '0';`
116			`keyDataEn <= '0';`
117			`keyDataShift <= '0';`
118			`ciphDataEn <= '0';`
119			`ciphDataShift <= '0';`
120			`startSig <= '0';`
121			`serialDataCtrCt <= '0';`
122			`shiftDataCtrCt <= '0';`
123			`serialDataCtrReset <= '0';`
124	4	gajos	`-- data has come`
125	3	gajos	`if (RDAsig = '1') then`
126			`next_state <= READ_DATA_TEXT;`
127			`else`
128			`next_state <= NOP;`
129			`end if;`
130	4	gajos	`-- Cipher data enable and read data`
131	3	gajos	`when READ_DATA_TEXT =>`
132			`RDsig <= '1';`
133			`WRsig <= '0';`
134			`textDataEn <= '1';`
135			`textDataShift <= '0';`
136			`keyDataEn <= '0';`
137			`keyDataShift <= '0';`
138			`ciphDataEn <= '0';`
139			`ciphDataShift <= '0';`
140			`startSig <= '0';`
141	4	gajos	`-- counter of retrieved bytes`
142	3	gajos	`serialDataCtrCt <= '1';`
143			`shiftDataCtrCt <= '0';`
144			`serialDataCtrReset <= '0';`
145			`next_state <= DECODE_READ_TEXT;`
146	4	gajos	`-- Cipher data readed, stop counter and check if proper number of byte`
147			`-- was readed`
148	3	gajos	`when DECODE_READ_TEXT =>`
149			`RDsig <= '0';`
150			`WRsig <= '0';`
151			`textDataEn <= '0';`
152			`textDataShift <= '0';`
153			`keyDataEn <= '0';`
154			`keyDataShift <= '0';`
155			`ciphDataEn <= '0';`
156			`ciphDataShift <= '0';`
157			`startSig <= '0';`
158			`serialDataCtrCt <= '0';`
159			`shiftDataCtrCt <= '0';`
160	4	gajos	`-- 8 bytes should be readed`
161			`if (serialDataCtrOut(3 downto 0) = "1000") then`
162			`-- 8 bytes was readed`
163	3	gajos	`next_state <= TEMP_STATE;`
164	4	gajos	`else`
165			`-- 8 bytes was not readed`
166	3	gajos	`next_state <= MOVE_TEXT;`
167			`end if;`
168	4	gajos	`-- Reset counter for next reading`
169	3	gajos	`when TEMP_STATE =>`
170			`RDsig <= '0';`
171			`WRsig <= '0';`
172			`textDataEn <= '0';`
173			`textDataShift <= '0';`
174			`keyDataEn <= '0';`
175			`keyDataShift <= '0';`
176			`ciphDataEn <= '0';`
177			`ciphDataShift <= '0';`
178			`startSig <= '0';`
179			`serialDataCtrCt <= '0';`
180			`shiftDataCtrCt <= '0';`
181			`serialDataCtrReset <= '1';`
182			`next_state <= NOP_FOR_KEY;`
183	4	gajos	`-- Here data are shfted in shift register - another shift counter are used`
184	3	gajos	`when MOVE_TEXT =>`
185			`RDsig <= '0';`
186			`WRsig <= '0';`
187			`textDataEn <= '0';`
188			`textDataShift <= '1';`
189			`keyDataEn <= '0';`
190			`keyDataShift <= '0';`
191			`ciphDataEn <= '0';`
192			`ciphDataShift <= '0';`
193			`startSig <= '0';`
194			`serialDataCtrCt <= '0';`
195			`shiftDataCtrCt <= '1';`
196			`serialDataCtrReset <= '0';`
197			`if (shiftDataCtrOut(2 downto 0) = "111") then`
198			`next_state <= NOP;`
199			`else`
200			`next_state <= MOVE_TEXT;`
201			`end if;`
202	4	gajos	`-- "No operation 2" waiting for data - it could be optimized in way,`
203			`-- that waiting for key and text could be the same state, but it was`
204			`-- intentionally separated.`
205	3	gajos	`when NOP_FOR_KEY =>`
206			`RDsig <= '0';`
207			`WRsig <= '0';`
208			`textDataEn <= '0';`
209			`textDataShift <= '0';`
210			`keyDataEn <= '0';`
211			`keyDataShift <= '0';`
212			`ciphDataEn <= '0';`
213			`ciphDataShift <= '0';`
214			`startSig <= '0';`
215			`serialDataCtrCt <= '0';`
216			`shiftDataCtrCt <= '0';`
217			`serialDataCtrReset <= '0';`
218	4	gajos	`-- data has come`
219	3	gajos	`if (RDAsig = '1') then`
220			`next_state <= READ_DATA_KEY;`
221			`else`
222			`next_state <= NOP_FOR_KEY;`
223			`end if;`
224	4	gajos	`-- Key data enable and read data`
225	3	gajos	`when READ_DATA_KEY =>`
226			`RDsig <= '1';`
227			`WRsig <= '0';`
228			`textDataEn <= '0';`
229			`textDataShift <= '0';`
230			`keyDataEn <= '1';`
231			`keyDataShift <= '0';`
232			`ciphDataEn <= '0';`
233			`ciphDataShift <= '0';`
234			`startSig <= '0';`
235	4	gajos	`-- counter of retrieved bytes`
236	3	gajos	`serialDataCtrCt <= '1';`
237			`shiftDataCtrCt <= '0';`
238			`serialDataCtrReset <= '0';`
239			`next_state <= DECODE_READ_KEY;`
240	4	gajos	`-- Data readed, stop counter and check if proper number of byte`
241			`-- was readed`
242	3	gajos	`when DECODE_READ_KEY =>`
243			`RDsig <= '0';`
244			`WRsig <= '0';`
245			`textDataEn <= '0';`
246			`textDataShift <= '0';`
247			`keyDataEn <= '0';`
248			`keyDataShift <= '0';`
249			`ciphDataEn <= '0';`
250			`ciphDataShift <= '0';`
251			`startSig <= '0';`
252			`serialDataCtrCt <= '0';`
253			`shiftDataCtrCt <= '0';`
254			`serialDataCtrReset <= '0';`
255	4	gajos	`-- 10 bytes should be readed`
256			`if (serialDataCtrOut(3 downto 0) = "1010") then`
257			`-- 10 bytes was readed`
258	3	gajos	`next_state <= TEMP2_STATE;`
259	4	gajos	`else`
260			`-- 10 bytes was not readed`
261	3	gajos	`next_state <= MOVE_KEY;`
262			`end if;`
263	4	gajos	`-- Reset counter for next reading`
264	3	gajos	`when TEMP2_STATE =>`
265			`RDsig <= '0';`
266			`WRsig <= '0';`
267			`textDataEn <= '0';`
268			`textDataShift <= '0';`
269			`keyDataEn <= '0';`
270			`keyDataShift <= '0';`
271			`ciphDataEn <= '0';`
272			`ciphDataShift <= '0';`
273			`startSig <= '0';`
274			`serialDataCtrCt <= '0';`
275			`shiftDataCtrCt <= '0';`
276			`serialDataCtrReset <= '1';`
277			`next_state <= PRESENT_ENCODE;`
278	4	gajos	`-- Here data are shfted in shift register - another shift counter are used`
279	3	gajos	`when MOVE_KEY =>`
280			`RDsig <= '0';`
281			`WRsig <= '0';`
282			`textDataEn <= '0';`
283			`textDataShift <= '0';`
284			`keyDataEn <= '0';`
285			`keyDataShift <= '1';`
286			`ciphDataEn <= '0';`
287			`ciphDataShift <= '0';`
288			`startSig <= '0';`
289			`serialDataCtrCt <= '0';`
290			`shiftDataCtrCt <= '1';`
291			`serialDataCtrReset <= '0';`
292			`if (shiftDataCtrOut(2 downto 0) = "111") then`
293			`next_state <= NOP_FOR_KEY;`
294			`else`
295			`next_state <= MOVE_KEY;`
296			`end if;`
297	4	gajos	`-- All suitable data was readed Present encode start`
298	3	gajos	`when PRESENT_ENCODE =>`
299			`RDsig <= '0';`
300			`WRsig <= '0';`
301			`textDataEn <= '0';`
302			`textDataShift <= '0';`
303			`keyDataEn <= '0';`
304			`keyDataShift <= '0';`
305			`ciphDataShift <= '0';`
306			`startSig <= '1';`
307			`serialDataCtrCt <= '0';`
308			`shiftDataCtrCt <= '0';`
309			`serialDataCtrReset <= '0';`
310	4	gajos	`-- change state if Present result ready`
311	3	gajos	`if (readySig = '1') then`
312			`ciphDataEn <= '1';`
313			`next_state <= WRITE_OUT;`
314			`else`
315			`ciphDataEn <= '0';`
316			`next_state <= PRESENT_ENCODE;`
317			`end if;`
318	4	gajos	`-- similar control of writing result as during reading`
319	3	gajos	`when WRITE_OUT =>`
320			`RDsig <= '0';`
321			`textDataEn <= '0';`
322			`textDataShift <= '0';`
323			`keyDataEn <= '0';`
324			`keyDataShift <= '0';`
325			`ciphDataEn <= '0';`
326			`ciphDataShift <= '0';`
327			`startSig <= '1';`
328			`serialDataCtrCt <= '1';`
329			`shiftDataCtrCt <= '0';`
330			`serialDataCtrReset <= '0';`
331			`if (serialDataCtrOut = "1000") then`
332			`WRsig <= '0';`
333			`next_state <= TEMP_OUT;`
334			`else`
335			`WRsig <= '1';`
336			`next_state <= MOVE_OUT;`
337			`end if;`
338	4	gajos	`-- all data was sended - start new Present encode cycle`
339	3	gajos	`when TEMP_OUT =>`
340			`RDsig <= '0';`
341			`WRsig <= '0';`
342			`textDataEn <= '0';`
343			`textDataShift <= '0';`
344			`keyDataEn <= '0';`
345			`keyDataShift <= '0';`
346			`ciphDataEn <= '0';`
347			`ciphDataShift <= '0';`
348			`startSig <= '1';`
349			`serialDataCtrCt <= '0';`
350			`shiftDataCtrCt <= '0';`
351			`serialDataCtrReset <= '1';`
352			`next_state <= NOP;`
353			`when MOVE_OUT =>`
354			`if (TBEsig = '0') then`
355			`RDsig <= '0';`
356			`WRsig <= '0';`
357			`textDataEn <= '0';`
358			`textDataShift <= '0';`
359			`keyDataEn <= '0';`
360			`keyDataShift <= '0';`
361			`ciphDataEn <= '0';`
362			`ciphDataShift <= '0';`
363			`startSig <= '1';`
364			`serialDataCtrCt <= '0';`
365			`shiftDataCtrCt <= '0';`
366			`serialDataCtrReset <= '0';`
367			`next_state <= MOVE_OUT;`
368			`else`
369			`RDsig <= '0';`
370			`WRsig <= '0';`
371			`textDataEn <= '0';`
372			`textDataShift <= '0';`
373			`keyDataEn <= '0';`
374			`keyDataShift <= '0';`
375			`ciphDataEn <= '0';`
376			`ciphDataShift <= '1';`
377			`startSig <= '1';`
378			`serialDataCtrCt <= '0';`
379			`shiftDataCtrCt <= '1';`
380			`serialDataCtrReset <= '0';`
381			`if (shiftDataCtrOut = "111") then`
382			`next_state <= WRITE_OUT;`
383			`else`
384			`next_state <= MOVE_OUT;`
385			`end if;`
386			`end if;`
387			`end case;`
388			`end process SM;`
389
390			`state_modifier : process (clk, reset)`
391			`begin`
392	20	gajos	`if (reset = '1') then`
393			`state <= NOP;`
394			`elsif (clk = '1' and clk'Event) then`
395			`state <= next_state;`
396			`end if;`
397	3	gajos	`end process state_modifier;`
398	4	gajos
399			`-- counter for controling number of bytes of readed data`
400	3	gajos	`dataCounter : counter`
401			`generic map(`
402			`w_5 => 4`
403			`)`
404			`port map (`
405			`cnt_res => serialDataCtrCt,`
406			`num => serialDataCtrOut,`
407			`clk => clk,`
408			`reset => ctrReset`
409			`);`
410	4	gajos
411			`-- counter for controling number of shifted bits of readed data`
412	3	gajos	`shiftCounter : counter`
413			`generic map(`
414			`w_5 => 3`
415			`)`
416			`port map (`
417			`cnt_res => shiftDataCtrCt,`
418			`num => shiftDataCtrOut,`
419			`clk => clk,`
420			`reset => reset`
421			`);`
422
423			`end Behavioral;`
424

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[/] [present/] [trunk/] [DecodeTesting/] [rtl/] [vhdl/] [PresentDecodeCommSM.vhd] - Blame information for rev 20