signal_processing_vorlage/hardware/signal_processing/crc.vhd

library ieee;
    use ieee.std_logic_1164.all;
    use ieee.numeric_std.all;

library work;
    use work.reg32.all;
    use work.task.all;

entity crc is
    port (
        clk : in std_logic;
        reset : in std_logic;

        task_start : in std_logic;
        task_state : out work.task.State;

        signal_read : out std_logic;
        signal_readdata : in std_logic_vector( 31 downto 0 );

        signal_write : out std_logic;
        signal_writedata : out std_logic_vector( 31 downto 0 )
    );
end entity crc;

-- tbd
-- startwert crc32 ist const, vom Algorithmus vorgegeben

architecture rtl of crc is

    signal current_task_state : work.task.State;
    signal next_task_state : work.task.State;
    signal index : integer range 0 to work.task.STREAM_LEN;

	signal crc_in : std_logic_vector( 31 downto 0 ) := (others => '1');
	signal crc_out : std_logic_vector( 31 downto 0);
	signal crc_state : integer range 0 to 2;
	signal flag_index : bit := '0';


begin
    task_state_transitions : process ( current_task_state, task_start, index ) is
    begin
        next_task_state <= current_task_state;
        case current_task_state is
            when work.task.TASK_IDLE =>
                if ( task_start = '1' ) then
                    next_task_state <= work.task.TASK_RUNNING;
                end if;
            when work.task.TASK_RUNNING =>
                if ( index = work.task.STREAM_LEN - 1 ) then
                    next_task_state <= work.task.TASK_DONE;
                end if;
            when work.task.TASK_DONE =>
                if ( task_start = '1' ) then
                    next_task_state <= work.task.TASK_RUNNING;
                end if;
        end case;
    end process task_state_transitions;

    sync : process ( clk, reset ) is
    begin
        if ( reset = '1' ) then
            current_task_state <= work.task.TASK_IDLE;
            index <= 0;
        elsif ( rising_edge( clk ) ) then
            current_task_state <= next_task_state;
            case next_task_state is
            when work.task.TASK_IDLE =>
                index <= 0;
                -- signal_write <= '0';
            when work.task.TASK_RUNNING =>
				if ( flag_index = '1' ) then
					index <= index + 1;
				end if;
                -- signal_write <= '1';
                -- signal_writedata <= ( others => '0' );
            when work.task.TASK_DONE =>
                index <= 0;
                -- signal_write <= '0';
            end case;
        end if;
    end process sync;

	crc_calc :process ( clk, reset ) is
	begin
        if ( reset = '1' ) then
        	signal_read <= '0';
			signal_write <= '0';
			signal_writedata <= (others => '0');
			flag_index <= '0';
        elsif ( rising_edge( clk ) ) then
			case crc_state is
			when 0 =>
				signal_write <= '0';
				flag_index <= '0';
				if ( current_task_state = work.task.TASK_RUNNING ) then
					signal_read <= '1';
					crc_state <= 1;
				end if;
			when 1 =>
				signal_read <= '0';

-- calc crc
-- THIS IS GENERATED VHDL CODE.
-- https://bues.ch/h/crcgen
-- 
-- This code is Public Domain.
-- Permission to use, copy, modify, and/or distribute this software for any
-- purpose with or without fee is hereby granted.
-- 
-- THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
-- WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-- MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
-- SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
-- RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
-- NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE
-- USE OR PERFORMANCE OF THIS SOFTWARE.

-- CRC polynomial coefficients: x^32 + x^26 + x^23 + x^22 + x^16 + x^12 + x^11 + x^10 + x^8 + x^7 + x^5 + x^4 + x^2 + x + 1
--                              0xEDB88320 (hex)
-- CRC width:                   32 bits
-- CRC shift direction:         right (little endian)
-- Input word width:            32 bits

				crc_out(0) <= crc_in(0) xor crc_in(1) xor crc_in(2) xor crc_in(3) xor crc_in(4) xor crc_in(6) xor crc_in(7) xor crc_in(8) xor crc_in(16) xor crc_in(20) xor crc_in(22) xor crc_in(23) xor crc_in(26) xor signal_readdata(0) xor signal_readdata(1) xor signal_readdata(2) xor signal_readdata(3) xor signal_readdata(4) xor signal_readdata(6) xor signal_readdata(7) xor signal_readdata(8) xor signal_readdata(16) xor signal_readdata(20) xor signal_readdata(22) xor signal_readdata(23) xor signal_readdata(26);

    			crc_out(1) <= crc_in(1) xor crc_in(2) xor crc_in(3) xor crc_in(4) xor crc_in(5) xor crc_in(7) xor crc_in(8) xor crc_in(9) xor crc_in(17) xor crc_in(21) xor crc_in(23) xor crc_in(24) xor crc_in(27) xor signal_readdata(1) xor signal_readdata(2) xor signal_readdata(3) xor signal_readdata(4) xor signal_readdata(5) xor signal_readdata(7) xor signal_readdata(8) xor signal_readdata(9) xor signal_readdata(17) xor signal_readdata(21) xor signal_readdata(23) xor signal_readdata(24) xor signal_readdata(27);

    			crc_out(2) <= crc_in(0) xor crc_in(2) xor crc_in(3) xor crc_in(4) xor crc_in(5) xor crc_in(6) xor crc_in(8) xor crc_in(9) xor crc_in(10) xor crc_in(18) xor crc_in(22) xor crc_in(24) xor crc_in(25) xor crc_in(28) xor signal_readdata(0) xor signal_readdata(2) xor signal_readdata(3) xor signal_readdata(4) xor signal_readdata(5) xor signal_readdata(6) xor signal_readdata(8) xor signal_readdata(9) xor signal_readdata(10) xor signal_readdata(18) xor signal_readdata(22) xor signal_readdata(24) xor signal_readdata(25) xor signal_readdata(28);

    			crc_out(3) <= crc_in(1) xor crc_in(3) xor crc_in(4) xor crc_in(5) xor crc_in(6) xor crc_in(7) xor crc_in(9) xor crc_in(10) xor crc_in(11) xor crc_in(19) xor crc_in(23) xor crc_in(25) xor crc_in(26) xor crc_in(29) xor signal_readdata(1) xor signal_readdata(3) xor signal_readdata(4) xor signal_readdata(5) xor signal_readdata(6) xor signal_readdata(7) xor signal_readdata(9) xor signal_readdata(10) xor signal_readdata(11) xor signal_readdata(19) xor signal_readdata(23) xor signal_readdata(25) xor signal_readdata(26) xor signal_readdata(29);

    			crc_out(4) <= crc_in(2) xor crc_in(4) xor crc_in(5) xor crc_in(6) xor crc_in(7) xor crc_in(8) xor crc_in(10) xor crc_in(11) xor crc_in(12) xor crc_in(20) xor crc_in(24) xor crc_in(26) xor crc_in(27) xor crc_in(30) xor signal_readdata(2) xor signal_readdata(4) xor signal_readdata(5) xor signal_readdata(6) xor signal_readdata(7) xor signal_readdata(8) xor signal_readdata(10) xor signal_readdata(11) xor signal_readdata(12) xor signal_readdata(20) xor signal_readdata(24) xor signal_readdata(26) xor signal_readdata(27) xor signal_readdata(30);

    			crc_out(5) <= crc_in(0) xor crc_in(3) xor crc_in(5) xor crc_in(6) xor crc_in(7) xor crc_in(8) xor crc_in(9) xor crc_in(11) xor crc_in(12) xor crc_in(13) xor crc_in(21) xor crc_in(25) xor crc_in(27) xor crc_in(28) xor crc_in(31) xor signal_readdata(0) xor signal_readdata(3) xor signal_readdata(5) xor signal_readdata(6) xor signal_readdata(7) xor signal_readdata(8) xor signal_readdata(9) xor signal_readdata(11) xor signal_readdata(12) xor signal_readdata(13) xor signal_readdata(21) xor signal_readdata(25) xor signal_readdata(27) xor signal_readdata(28) xor signal_readdata(31);

    			crc_out(6) <= crc_in(0) xor crc_in(2) xor crc_in(3) xor crc_in(9) xor crc_in(10) xor crc_in(12) xor crc_in(13) xor crc_in(14) xor crc_in(16) xor crc_in(20) xor crc_in(23) xor crc_in(28) xor crc_in(29) xor signal_readdata(0) xor signal_readdata(2) xor signal_readdata(3) xor signal_readdata(9) xor signal_readdata(10) xor signal_readdata(12) xor signal_readdata(13) xor signal_readdata(14) xor signal_readdata(16) xor signal_readdata(20) xor signal_readdata(23) xor signal_readdata(28) xor signal_readdata(29);

    			crc_out(7) <= crc_in(1) xor crc_in(3) xor crc_in(4) xor crc_in(10) xor crc_in(11) xor crc_in(13) xor crc_in(14) xor crc_in(15) xor crc_in(17) xor crc_in(21) xor crc_in(24) xor crc_in(29) xor crc_in(30) xor signal_readdata(1) xor signal_readdata(3) xor signal_readdata(4) xor signal_readdata(10) xor signal_readdata(11) xor signal_readdata(13) xor signal_readdata(14) xor signal_readdata(15) xor signal_readdata(17) xor signal_readdata(21) xor signal_readdata(24) xor signal_readdata(29) xor signal_readdata(30);

    			crc_out(8) <= crc_in(0) xor crc_in(2) xor crc_in(4) xor crc_in(5) xor crc_in(11) xor crc_in(12) xor crc_in(14) xor crc_in(15) xor crc_in(16) xor crc_in(18) xor crc_in(22) xor crc_in(25) xor crc_in(30) xor crc_in(31) xor signal_readdata(0) xor signal_readdata(2) xor signal_readdata(4) xor signal_readdata(5) xor signal_readdata(11) xor signal_readdata(12) xor signal_readdata(14) xor signal_readdata(15) xor signal_readdata(16) xor signal_readdata(18) xor signal_readdata(22) xor signal_readdata(25) xor signal_readdata(30) xor signal_readdata(31);

    			crc_out(9) <= crc_in(0) xor crc_in(2) xor crc_in(4) xor crc_in(5) xor crc_in(7) xor crc_in(8) xor crc_in(12) xor crc_in(13) xor crc_in(15) xor crc_in(17) xor crc_in(19) xor crc_in(20) xor crc_in(22) xor crc_in(31) xor signal_readdata(0) xor signal_readdata(2) xor signal_readdata(4) xor signal_readdata(5) xor signal_readdata(7) xor signal_readdata(8) xor signal_readdata(12) xor signal_readdata(13) xor signal_readdata(15) xor signal_readdata(17) xor signal_readdata(19) xor signal_readdata(20) xor signal_readdata(22) xor signal_readdata(31);

    			crc_out(10) <= crc_in(0) xor crc_in(2) xor crc_in(4) xor crc_in(5) xor crc_in(7) xor crc_in(9) xor crc_in(13) xor crc_in(14) xor crc_in(18) xor crc_in(21) xor crc_in(22) xor crc_in(26) xor signal_readdata(0) xor signal_readdata(2) xor signal_readdata(4) xor signal_readdata(5) xor signal_readdata(7) xor signal_readdata(9) xor signal_readdata(13) xor signal_readdata(14) xor signal_readdata(18) xor signal_readdata(21) xor signal_readdata(22) xor signal_readdata(26);

    			crc_out(11) <= crc_in(1) xor crc_in(3) xor crc_in(5) xor crc_in(6) xor crc_in(8) xor crc_in(10) xor crc_in(14) xor crc_in(15) xor crc_in(19) xor crc_in(22) xor crc_in(23) xor crc_in(27) xor signal_readdata(1) xor signal_readdata(3) xor signal_readdata(5) xor signal_readdata(6) xor signal_readdata(8) xor signal_readdata(10) xor signal_readdata(14) xor signal_readdata(15) xor signal_readdata(19) xor signal_readdata(22) xor signal_readdata(23) xor signal_readdata(27);

    			crc_out(12) <= crc_in(2) xor crc_in(4) xor crc_in(6) xor crc_in(7) xor crc_in(9) xor crc_in(11) xor crc_in(15) xor crc_in(16) xor crc_in(20) xor crc_in(23) xor crc_in(24) xor crc_in(28) xor signal_readdata(2) xor signal_readdata(4) xor signal_readdata(6) xor signal_readdata(7) xor signal_readdata(9) xor signal_readdata(11) xor signal_readdata(15) xor signal_readdata(16) xor signal_readdata(20) xor signal_readdata(23) xor signal_readdata(24) xor signal_readdata(28);

    			crc_out(13) <= crc_in(0) xor crc_in(3) xor crc_in(5) xor crc_in(7) xor crc_in(8) xor crc_in(10) xor crc_in(12) xor crc_in(16) xor crc_in(17) xor crc_in(21) xor crc_in(24) xor crc_in(25) xor crc_in(29) xor signal_readdata(0) xor signal_readdata(3) xor signal_readdata(5) xor signal_readdata(7) xor signal_readdata(8) xor signal_readdata(10) xor signal_readdata(12) xor signal_readdata(16) xor signal_readdata(17) xor signal_readdata(21) xor signal_readdata(24) xor signal_readdata(25) xor signal_readdata(29);

    			crc_out(14) <= crc_in(0) xor crc_in(1) xor crc_in(4) xor crc_in(6) xor crc_in(8) xor crc_in(9) xor crc_in(11) xor crc_in(13) xor crc_in(17) xor crc_in(18) xor crc_in(22) xor crc_in(25) xor crc_in(26) xor crc_in(30) xor signal_readdata(0) xor signal_readdata(1) xor signal_readdata(4) xor signal_readdata(6) xor signal_readdata(8) xor signal_readdata(9) xor signal_readdata(11) xor signal_readdata(13) xor signal_readdata(17) xor signal_readdata(18) xor signal_readdata(22) xor signal_readdata(25) xor signal_readdata(26) xor signal_readdata(30);

    			crc_out(15) <= crc_in(1) xor crc_in(2) xor crc_in(5) xor crc_in(7) xor crc_in(9) xor crc_in(10) xor crc_in(12) xor crc_in(14) xor crc_in(18) xor crc_in(19) xor crc_in(23) xor crc_in(26) xor crc_in(27) xor crc_in(31) xor signal_readdata(1) xor signal_readdata(2) xor signal_readdata(5) xor signal_readdata(7) xor signal_readdata(9) xor signal_readdata(10) xor signal_readdata(12) xor signal_readdata(14) xor signal_readdata(18) xor signal_readdata(19) xor signal_readdata(23) xor signal_readdata(26) xor signal_readdata(27) xor signal_readdata(31);

    			crc_out(16) <= crc_in(1) xor crc_in(4) xor crc_in(7) xor crc_in(10) xor crc_in(11) xor crc_in(13) xor crc_in(15) xor crc_in(16) xor crc_in(19) xor crc_in(22) xor crc_in(23) xor crc_in(24) xor crc_in(26) xor crc_in(27) xor crc_in(28) xor signal_readdata(1) xor signal_readdata(4) xor signal_readdata(7) xor signal_readdata(10) xor signal_readdata(11) xor signal_readdata(13) xor signal_readdata(15) xor signal_readdata(16) xor signal_readdata(19) xor signal_readdata(22) xor signal_readdata(23) xor signal_readdata(24) xor signal_readdata(26) xor signal_readdata(27) xor signal_readdata(28);

    			crc_out(17) <= crc_in(2) xor crc_in(5) xor crc_in(8) xor crc_in(11) xor crc_in(12) xor crc_in(14) xor crc_in(16) xor crc_in(17) xor crc_in(20) xor crc_in(23) xor crc_in(24) xor crc_in(25) xor crc_in(27) xor crc_in(28) xor crc_in(29) xor signal_readdata(2) xor signal_readdata(5) xor signal_readdata(8) xor signal_readdata(11) xor signal_readdata(12) xor signal_readdata(14) xor signal_readdata(16) xor signal_readdata(17) xor signal_readdata(20) xor signal_readdata(23) xor signal_readdata(24) xor signal_readdata(25) xor signal_readdata(27) xor signal_readdata(28) xor signal_readdata(29);

    			crc_out(18) <= crc_in(0) xor crc_in(3) xor crc_in(6) xor crc_in(9) xor crc_in(12) xor crc_in(13) xor crc_in(15) xor crc_in(17) xor crc_in(18) xor crc_in(21) xor crc_in(24) xor crc_in(25) xor crc_in(26) xor crc_in(28) xor crc_in(29) xor crc_in(30) xor signal_readdata(0) xor signal_readdata(3) xor signal_readdata(6) xor signal_readdata(9) xor signal_readdata(12) xor signal_readdata(13) xor signal_readdata(15) xor signal_readdata(17) xor signal_readdata(18) xor signal_readdata(21) xor signal_readdata(24) xor signal_readdata(25) xor signal_readdata(26) xor signal_readdata(28) xor signal_readdata(29) xor signal_readdata(30);

    			crc_out(19) <= crc_in(0) xor crc_in(1) xor crc_in(4) xor crc_in(7) xor crc_in(10) xor crc_in(13) xor crc_in(14) xor crc_in(16) xor crc_in(18) xor crc_in(19) xor crc_in(22) xor crc_in(25) xor crc_in(26) xor crc_in(27) xor crc_in(29) xor crc_in(30) xor crc_in(31) xor signal_readdata(0) xor signal_readdata(1) xor signal_readdata(4) xor signal_readdata(7) xor signal_readdata(10) xor signal_readdata(13) xor signal_readdata(14) xor signal_readdata(16) xor signal_readdata(18) xor signal_readdata(19) xor signal_readdata(22) xor signal_readdata(25) xor signal_readdata(26) xor signal_readdata(27) xor signal_readdata(29) xor signal_readdata(30) xor signal_readdata(31);

    			crc_out(20) <= crc_in(0) xor crc_in(3) xor crc_in(4) xor crc_in(5) xor crc_in(6) xor crc_in(7) xor crc_in(11) xor crc_in(14) xor crc_in(15) xor crc_in(16) xor crc_in(17) xor crc_in(19) xor crc_in(22) xor crc_in(27) xor crc_in(28) xor crc_in(30) xor crc_in(31) xor signal_readdata(0) xor signal_readdata(3) xor signal_readdata(4) xor signal_readdata(5) xor signal_readdata(6) xor signal_readdata(7) xor signal_readdata(11) xor signal_readdata(14) xor signal_readdata(15) xor signal_readdata(16) xor signal_readdata(17) xor signal_readdata(19) xor signal_readdata(22) xor signal_readdata(27) xor signal_readdata(28) xor signal_readdata(30) xor signal_readdata(31);

    			crc_out(21) <= crc_in(0) xor crc_in(2) xor crc_in(3) xor crc_in(5) xor crc_in(12) xor crc_in(15) xor crc_in(17) xor crc_in(18) xor crc_in(22) xor crc_in(26) xor crc_in(28) xor crc_in(29) xor crc_in(31) xor signal_readdata(0) xor signal_readdata(2) xor signal_readdata(3) xor signal_readdata(5) xor signal_readdata(12) xor signal_readdata(15) xor signal_readdata(17) xor signal_readdata(18) xor signal_readdata(22) xor signal_readdata(26) xor signal_readdata(28) xor signal_readdata(29) xor signal_readdata(31);

    			crc_out(22) <= crc_in(2) xor crc_in(7) xor crc_in(8) xor crc_in(13) xor crc_in(18) xor crc_in(19) xor crc_in(20) xor crc_in(22) xor crc_in(26) xor crc_in(27) xor crc_in(29) xor crc_in(30) xor signal_readdata(2) xor signal_readdata(7) xor signal_readdata(8) xor signal_readdata(13) xor signal_readdata(18) xor signal_readdata(19) xor signal_readdata(20) xor signal_readdata(22) xor signal_readdata(26) xor signal_readdata(27) xor signal_readdata(29) xor signal_readdata(30);

    			crc_out(23) <= crc_in(0) xor crc_in(3) xor crc_in(8) xor crc_in(9) xor crc_in(14) xor crc_in(19) xor crc_in(20) xor crc_in(21) xor crc_in(23) xor crc_in(27) xor crc_in(28) xor crc_in(30) xor crc_in(31) xor signal_readdata(0) xor signal_readdata(3) xor signal_readdata(8) xor signal_readdata(9) xor signal_readdata(14) xor signal_readdata(19) xor signal_readdata(20) xor signal_readdata(21) xor signal_readdata(23) xor signal_readdata(27) xor signal_readdata(28) xor signal_readdata(30) xor signal_readdata(31);

    			crc_out(24) <= crc_in(2) xor crc_in(3) xor crc_in(6) xor crc_in(7) xor crc_in(8) xor crc_in(9) xor crc_in(10) xor crc_in(15) xor crc_in(16) xor crc_in(21) xor crc_in(23) xor crc_in(24) xor crc_in(26) xor crc_in(28) xor crc_in(29) xor crc_in(31) xor signal_readdata(2) xor signal_readdata(3) xor signal_readdata(6) xor signal_readdata(7) xor signal_readdata(8) xor signal_readdata(9) xor signal_readdata(10) xor signal_readdata(15) xor signal_readdata(16) xor signal_readdata(21) xor signal_readdata(23) xor signal_readdata(24) xor signal_readdata(26) xor signal_readdata(28) xor signal_readdata(29) xor signal_readdata(31);

    			crc_out(25) <= crc_in(1) xor crc_in(2) xor crc_in(6) xor crc_in(9) xor crc_in(10) xor crc_in(11) xor crc_in(17) xor crc_in(20) xor crc_in(23) xor crc_in(24) xor crc_in(25) xor crc_in(26) xor crc_in(27) xor crc_in(29) xor crc_in(30) xor signal_readdata(1) xor signal_readdata(2) xor signal_readdata(6) xor signal_readdata(9) xor signal_readdata(10) xor signal_readdata(11) xor signal_readdata(17) xor signal_readdata(20) xor signal_readdata(23) xor signal_readdata(24) xor signal_readdata(25) xor signal_readdata(26) xor signal_readdata(27) xor signal_readdata(29) xor signal_readdata(30);

    			crc_out(26) <= crc_in(2) xor crc_in(3) xor crc_in(7) xor crc_in(10) xor crc_in(11) xor crc_in(12) xor crc_in(18) xor crc_in(21) xor crc_in(24) xor crc_in(25) xor crc_in(26) xor crc_in(27) xor crc_in(28) xor crc_in(30) xor crc_in(31) xor signal_readdata(2) xor signal_readdata(3) xor signal_readdata(7) xor signal_readdata(10) xor signal_readdata(11) xor signal_readdata(12) xor signal_readdata(18) xor signal_readdata(21) xor signal_readdata(24) xor signal_readdata(25) xor signal_readdata(26) xor signal_readdata(27) xor signal_readdata(28) xor signal_readdata(30) xor signal_readdata(31);

    			crc_out(27) <= crc_in(0) xor crc_in(1) xor crc_in(2) xor crc_in(6) xor crc_in(7) xor crc_in(11) xor crc_in(12) xor crc_in(13) xor crc_in(16) xor crc_in(19) xor crc_in(20) xor crc_in(23) xor crc_in(25) xor crc_in(27) xor crc_in(28) xor crc_in(29) xor crc_in(31) xor signal_readdata(0) xor signal_readdata(1) xor signal_readdata(2) xor signal_readdata(6) xor signal_readdata(7) xor signal_readdata(11) xor signal_readdata(12) xor signal_readdata(13) xor signal_readdata(16) xor signal_readdata(19) xor signal_readdata(20) xor signal_readdata(23) xor signal_readdata(25) xor signal_readdata(27) xor signal_readdata(28) xor signal_readdata(29) xor signal_readdata(31);

    			crc_out(28) <= crc_in(0) xor crc_in(4) xor crc_in(6) xor crc_in(12) xor crc_in(13) xor crc_in(14) xor crc_in(16) xor crc_in(17) xor crc_in(21) xor crc_in(22) xor crc_in(23) xor crc_in(24) xor crc_in(28) xor crc_in(29) xor crc_in(30) xor signal_readdata(0) xor signal_readdata(4) xor signal_readdata(6) xor signal_readdata(12) xor signal_readdata(13) xor signal_readdata(14) xor signal_readdata(16) xor signal_readdata(17) xor signal_readdata(21) xor signal_readdata(22) xor signal_readdata(23) xor signal_readdata(24) xor signal_readdata(28) xor signal_readdata(29) xor signal_readdata(30);

    			crc_out(29) <= crc_in(0) xor crc_in(1) xor crc_in(5) xor crc_in(7) xor crc_in(13) xor crc_in(14) xor crc_in(15) xor crc_in(17) xor crc_in(18) xor crc_in(22) xor crc_in(23) xor crc_in(24) xor crc_in(25) xor crc_in(29) xor crc_in(30) xor crc_in(31) xor signal_readdata(0) xor signal_readdata(1) xor signal_readdata(5) xor signal_readdata(7) xor signal_readdata(13) xor signal_readdata(14) xor signal_readdata(15) xor signal_readdata(17) xor signal_readdata(18) xor signal_readdata(22) xor signal_readdata(23) xor signal_readdata(24) xor signal_readdata(25) xor signal_readdata(29) xor signal_readdata(30) xor signal_readdata(31);

    			crc_out(30) <= crc_in(3) xor crc_in(4) xor crc_in(7) xor crc_in(14) xor crc_in(15) xor crc_in(18) xor crc_in(19) xor crc_in(20) xor crc_in(22) xor crc_in(24) xor crc_in(25) xor crc_in(30) xor crc_in(31) xor signal_readdata(3) xor signal_readdata(4) xor signal_readdata(7) xor signal_readdata(14) xor signal_readdata(15) xor signal_readdata(18) xor signal_readdata(19) xor signal_readdata(20) xor signal_readdata(22) xor signal_readdata(24) xor signal_readdata(25) xor signal_readdata(30) xor signal_readdata(31);

    			crc_out(31) <= crc_in(0) xor crc_in(1) xor crc_in(2) xor crc_in(3) xor crc_in(5) xor crc_in(6) xor crc_in(7) xor crc_in(15) xor crc_in(19) xor crc_in(21) xor crc_in(22) xor crc_in(25) xor crc_in(31) xor signal_readdata(0) xor signal_readdata(1) xor signal_readdata(2) xor signal_readdata(3) xor signal_readdata(5) xor signal_readdata(6) xor signal_readdata(7) xor signal_readdata(15) xor signal_readdata(19) xor signal_readdata(21) xor signal_readdata(22) xor signal_readdata(25) xor signal_readdata(31);

			crc_state <= 2;
			when 2 =>
				if ( current_task_state = work.task.TASK_DONE ) then
					signal_writedata <= not(crc_out);
					signal_write <= '1';
				end if;		
				
				flag_index <= '1';
				crc_state <= 0;
				-- assign new crc value
 				crc_in <= crc_out;

			end case;
		end if;
	end process crc_calc;

    task_state <= current_task_state;

end architecture rtl;