Library IEEE; Use IEEE.STD_LOGIC_1164.ALL; Use IEEE.STD_LOGIC_ARITH.ALL; Use IEEE.STD_LOGIC_UNSIGNED.ALL; ---------------------------- Entity declaration -------------------------------- entity interleaver is port(clk : in std_logic; -- Processing clock reset : in std_logic; -- Asynchronous active high reset data_in : in std_logic; -- Input data signal start_sym_in : in std_logic_vector(10 downto 0); -- Start symbol index no_of_sym_in : in std_logic_vector(10 downto 0); -- Number of symbols in the burst code_rate : in std_logic_vector(3 downto 0); -- code rate valid_in : in std_logic; -- Input valid signal rd_en_in : in std_logic; -- read enable signal data_out : out std_logic; -- Output data signal valid_out : out std_logic; -- Valid output signal start_sym_out : out std_logic_vector(10 downto 0); -- Start symbol index no_of_sym_out : out std_logic_vector(10 downto 0); -- Number of symbols for the burst rate_i : out std_logic_vector(3 downto 0); -- Code rate of outgoing fec block read_en_out : out std_logic -- when interleaving is ready to accept then read enable out will be generated ); end interleaver; ------------------ Architecture begins here ----------------------------------------- architecture Behavioral of interleaver is ------------------------ RAM declaration ----------------------------------------------- type ram_type is array (0 to 4095) of std_logic; signal RAM : ram_type; ----------------------- signals declaration ------------------------------------------ signal wr_add : std_logic_vector(10 downto 0); signal wr_add1 : std_logic_vector(11 downto 0); signal wr_count : std_logic_vector(1 downto 0); Signal Term_Count_s : std_logic_vector(10 downto 0); Signal Term_Count_s1 : std_logic_vector(10 downto 0); Signal Term_Count_s2 : std_logic_vector(10 downto 0); Signal Term_Count_s3 : std_logic_vector(10 downto 0); Signal Count_s : std_logic_vector(10 downto 0); Signal Count12_s : std_logic_vector(6 downto 0); Signal Count_2nd_s : std_logic_vector(3 downto 0); Signal TC : std_logic_vector(6 downto 0); Signal TC1 : std_logic_vector(6 downto 0); Signal Index1_s : std_logic_vector(10 downto 0); Signal Index2_s : std_logic_vector(10 downto 0); Signal Index3_s : std_logic_vector(10 downto 0); Signal Index4_s : std_logic_vector(10 downto 0); Signal Temp1_s : std_logic_vector(10 downto 0); Signal Temp2_s : std_logic_vector(10 downto 0); Signal Temp3_s : std_logic_vector(10 downto 0); Signal Temp4_s : std_logic_vector(10 downto 0); Signal Temp5_s : std_logic_vector(10 downto 0); Signal Temp6_s : std_logic_vector(10 downto 0); Signal Index1_s_d : std_logic_vector(10 downto 0); Signal Index2_s_d : std_logic_vector(10 downto 0); Signal Index3_s_d : std_logic_vector(10 downto 0); Signal Index4_s_d : std_logic_vector(10 downto 0); Signal count_off1 : std_logic_vector(3 downto 0); Signal count_off2 : std_logic_vector(3 downto 0); Signal count_off3 : std_logic_vector(3 downto 0); Signal count_off4 : std_logic_vector(3 downto 0); Signal count_off1_d : std_logic_vector(3 downto 0); signal code_rate_rd : std_logic_vector(3 downto 0); signal start_sym_in1 : std_logic_vector(10 downto 0); signal start_sym_in2 : std_logic_vector(10 downto 0); signal no_of_sym_in1 : std_logic_vector(10 downto 0); signal no_of_sym_in2 : std_logic_vector(10 downto 0); signal rate1 : std_logic_vector(3 downto 0); signal rate2 : std_logic_vector(3 downto 0); signal rd_en : std_logic; signal rd_en1 : std_logic; signal rd_en2 : std_logic; signal rd_en3 : std_logic; signal rd_en4 : std_logic; signal rd_count : std_logic_vector(1 downto 0); signal rd_count1 : std_logic_vector(1 downto 0); signal rd_count2 : std_logic_vector(1 downto 0); signal rd_count3 : std_logic_vector(1 downto 0); signal rd_add1 : std_logic_vector(11 downto 0); signal Index_out_s1 : std_logic_vector(10 downto 0); signal valid_in1 : std_logic; signal count_read : std_logic_vector(3 downto 0); Begin -- Based on the code rate assigning the number bits Term_Count_s <= "00010111111" when code_rate = "0000" else -- 191 "00101111111" when (code_rate = "0001" or code_rate = "0010") else -- 383 "01011111111" when (code_rate = "0011" or code_rate = "0100") else -- 767 "10001111111" when (code_rate = "0101" or code_rate = "0110") else -- 1151 "00000000000"; Term_Count_s1 <= "00010111111" when code_rate_rd = "0000" else -- 191 "00101111111" when (code_rate_rd = "0001" or code_rate_rd = "0010") else -- 383 "01011111111" when (code_rate_rd = "0011" or code_rate_rd = "0100") else -- 767 "10001111111" when (code_rate_rd = "0101" or code_rate_rd = "0110") else -- 1151 "00000000000"; TC <= "0001111" when code_rate_rd = "0000" else "0011111" when (code_rate_rd = "0001" or code_rate_rd = "0010") else "0111111" when (code_rate_rd = "0011" or code_rate_rd = "0100") else "1011111" when (code_rate_rd = "0101" or code_rate_rd = "0110") else "0000000"; process(clk, reset) begin if reset = '1' then wr_add <= (others => '0'); wr_count <= (others => '0'); start_sym_in1 <= (others => '0'); start_sym_in2 <= (others => '0'); no_of_sym_in1 <= (others => '0'); no_of_sym_in2 <= (others => '0'); rate1 <= (others => '0'); rate2 <= (others => '0'); Term_Count_s2 <= (others => '0'); elsif clk = '1' and clk'event then Term_Count_s2 <= Term_Count_s; if valid_in = '1' then if wr_Add = Term_Count_s2 then wr_Add <= (others => '0'); -- Write counter is incrementing based on the write address and term count s2 wr_count <= wr_count+'1'; if wr_count(0) = '0' then -- signal switching depending on the write count pointint to which either half rate1 <= code_rate; start_sym_in1 <= start_sym_in; no_of_sym_in1 <= no_of_sym_in; -- based on the write count lsb value assigning the start symbol, code rate and else -- number of symbols into two different set of signals. start_sym_in2 <= start_sym_in; no_of_sym_in2 <= no_of_sym_in; rate2 <= code_rate; end if; else wr_add <= wr_add+'1'; -- Incrementing the write address. end if; end if; end if; end process; wr_add1 <= wr_count(0)&wr_Add; process (clk) begin if (clk'event and clk = '1') then -- In this process writing the data if (valid_in = '1') then -- into RAM RAM(conv_integer(wr_add1)) <= data_in; end if; end if; end process; Process(clk, reset) begin if reset = '1' then count12_s <= ( others => '0' ); count_2nd_s <= ( others => '0' ); -- change to '0' count_s <= ( others => '0' ); start_sym_out <= ( others => '0' ); no_of_sym_out <= ( others => '0' ); rate_i <= ( others => '0' ); code_rate_rd <= ( others => '0' ); rd_en <= '0'; rd_count <= (others => '0'); Term_Count_s3 <= (others => '0'); TC1 <= (others => '0'); elsif clk'event and clk = '1' then if rd_en_in = '1' and wr_count /= rd_count then if rd_count(0) = '0' then -- selecting the signal correcponding to which half has read start_sym_out <= start_sym_in1; no_of_sym_out <= no_of_sym_in1; -- Based on the write count and read count and read enable in rate_i <= rate1; -- assigning the values to the output signals code_rate_rd <= rate1; else start_sym_out <= start_sym_in2; no_of_sym_out <= no_of_sym_in2; rate_i <= rate2; code_rate_rd <= rate1; end if; end if; Term_Count_s3 <= Term_Count_s1; TC1 <= TC; if rd_en = '1' then if(count_s = Term_Count_s3) then count_s <= ( others => '0'); rd_count <= rd_count+'1'; rd_en <= '0'; else -- based on the read enable incrementing the read count count_s <= count_s + '1'; -- and count_s signals end if; if(count12_s = TC1) then count12_s <= "0000000"; if (count_2nd_s = "1011") then count_2nd_s <= "0000"; else count_2nd_s <= count_2nd_s + '1'; end if; else count12_s <= count12_s + '1'; end if; elsif rd_en_in = '1' and wr_count/=rd_count then -- Generating the read enbale signal rd_en <= '1'; end if; end if; end process; process(clk, reset) begin if reset = '1' then read_en_out <= '0'; count_read <= "0000"; valid_in1 <= '0'; elsif clk = '1' and clk'event then valid_in1 <= valid_in; if (wr_count(0) = rd_count(0) and wr_count(1)/=rd_count(1)) or valid_in = '1' or valid_in1 = '1' then count_read <= count_read; else -- Generating the count read signal count_read <= count_Read+'1'; end if; if count_read = 15 then read_en_out <= '1'; else -- Generating the read enable out signal read_en_out <= '0'; end if; end if; end process; -- Assigning the location values to the index1_s based on count12_s value Index1_s <= "00000000000" when Count12_s = "0000000" else -- 0 "00000001100" when Count12_s = "0000001" else -- 12 "00000011000" when Count12_s = "0000010" else -- 24 "00000100100" when Count12_s = "0000011" else -- 36 "00000110000" when Count12_s = "0000100" else -- 48 "00000111100" when Count12_s = "0000101" else -- 60 "00001001000" when Count12_s = "0000110" else -- 72 "00001010100" when Count12_s = "0000111" else -- 84 "00001100000" when Count12_s = "0001000" else -- 96 "00001101100" when Count12_s = "0001001" else -- 108 "00001111000" when Count12_s = "0001010" else -- 120 "00010000100" when Count12_s = "0001011" else -- 132 "00010010000" when Count12_s = "0001100" else -- 144 "00010011100" when Count12_s = "0001101" else -- 156 "00010101000" when Count12_s = "0001110" else -- 168 "00010110100" when Count12_s = "0001111" else -- 180 "00011000000" when Count12_s = "0010000" else -- 192 "00011001100" when Count12_s = "0010001" else -- 204 "00011011000" when Count12_s = "0010010" else -- 216 "00011100100" when Count12_s = "0010011" else -- 228 "00011110000" when Count12_s = "0010100" else -- 240 "00011111100" when Count12_s = "0010101" else -- 252 "00100001000" when Count12_s = "0010110" else -- 264 "00100010100" when Count12_s = "0010111" else -- 276 "00100100000" when Count12_s = "0011000" else -- 288 "00100101100" when Count12_s = "0011001" else -- 300 "00100111000" when Count12_s = "0011010" else -- 312 "00101000100" when Count12_s = "0011011" else -- 324 "00101010000" when Count12_s = "0011100" else -- 336 "00101011100" when Count12_s = "0011101" else -- 348 "00101101000" when Count12_s = "0011110" else -- 360 "00101110100" when Count12_s = "0011111" else -- 372 "00110000000" when Count12_s = "0100000" else -- 384 "00110001100" when Count12_s = "0100001" else -- 396 "00110011000" when Count12_s = "0100010" else -- 408 "00110100100" when Count12_s = "0100011" else -- 420 "00110110000" when Count12_s = "0100100" else -- 432 "00110111100" when Count12_s = "0100101" else -- 444 "00111001000" when Count12_s = "0100110" else -- 456 "00111010100" when Count12_s = "0100111" else -- 468 "00111100000" when Count12_s = "0101000" else -- 480 "00111101100" when Count12_s = "0101001" else -- 492 "00111111000" when Count12_s = "0101010" else -- 504 "01000000100" when Count12_s = "0101011" else -- 516 "01000010000" when Count12_s = "0101100" else -- 528 "01000011100" when Count12_s = "0101101" else -- 540 "01000101000" when Count12_s = "0101110" else -- 552 "01000110100" when Count12_s = "0101111" else -- 564 "01001000000" when Count12_s = "0110000" else -- 576 "01001001100" when Count12_s = "0110001" else -- 588 "01001011000" when Count12_s = "0110010" else -- 600 "01001100100" when Count12_s = "0110011" else -- 612 "01001110000" when Count12_s = "0110100" else -- 624 "01001111100" when Count12_s = "0110101" else -- 636 "01010001000" when Count12_s = "0110110" else -- 648 "01010010100" when Count12_s = "0110111" else -- 660 "01010100000" when Count12_s = "0111000" else -- 672 "01010101100" when Count12_s = "0111001" else -- 684 "01010111000" when Count12_s = "0111010" else -- 696 "01011000100" when Count12_s = "0111011" else -- 708 "01011010000" when Count12_s = "0111100" else -- 720 "01011011100" when Count12_s = "0111101" else -- 732 "01011101000" when Count12_s = "0111110" else -- 744 "01011110100" when Count12_s = "0111111" else -- 756 "01100000000" when Count12_s = "1000000" else -- 768 "01100001100" when Count12_s = "1000001" else -- 780 "01100011000" when Count12_s = "1000010" else -- 792 "01100100100" when Count12_s = "1000011" else -- 804 "01100110000" when Count12_s = "1000100" else -- 816 "01100111100" when Count12_s = "1000101" else -- 828 "01101001000" when Count12_s = "1000110" else -- 840 "01101010100" when Count12_s = "1000111" else -- 852 "01101100000" when Count12_s = "1001000" else -- 864 "01101101100" when Count12_s = "1001001" else -- 876 "01101111000" when Count12_s = "1001010" else -- 888 "01110000100" when Count12_s = "1001011" else -- 900 "01110010000" when Count12_s = "1001100" else -- 912 "01110011100" when Count12_s = "1001101" else -- 924 "01110101000" when Count12_s = "1001110" else -- 936 "01110110100" when Count12_s = "1001111" else -- 948 "01111000000" when Count12_s = "1010000" else -- 960 "01111001100" when Count12_s = "1010001" else -- 972 "01111011000" when Count12_s = "1010010" else -- 984 "01111100100" when Count12_s = "1010011" else -- 996 "01111110000" when Count12_s = "1010100" else -- 1008 "01111111100" when Count12_s = "1010101" else -- 1020 "10000001000" when Count12_s = "1010110" else -- 1032 "10000010100" when Count12_s = "1010111" else -- 1044 "10000100000" when Count12_s = "1011000" else -- 1056 "10000101100" when Count12_s = "1011001" else -- 1068 "10000111000" when Count12_s = "1011010" else -- 1080 "10001000100" when Count12_s = "1011011" else -- 1092 "10001010000" when Count12_s = "1011100" else -- 1104 "10001011100" when Count12_s = "1011101" else -- 1116 "10001101000" when Count12_s = "1011110" else -- 1128 "10001110100" when Count12_s = "1011111" else -- 1140 "00000000000"; -- Assigning the locations values to the index2_s based on count12_s value Index2_s <= "00000001101" when count12_s = "0000000" else -- 13 "00000011001" when count12_s = "0000001" else -- 25 "00000000001" when count12_s = "0000010" else -- 1 "00000110001" when count12_s = "0000011" else -- 49 "00000111101" when count12_s = "0000100" else -- 61 "00000100101" when count12_s = "0000101" else -- 37 "00001010101" when count12_s = "0000110" else -- 85 "00001100001" when count12_s = "0000111" else -- 97 "00001001001" when count12_s = "0001000" else -- 73 "00001111001" when count12_s = "0001001" else -- 121 "00010000101" when count12_s = "0001010" else -- 133 "00001101101" when count12_s = "0001011" else -- 109 "00010011101" when count12_s = "0001100" else -- 157 "00010101001" when count12_s = "0001101" else -- 169 "00010010001" when count12_s = "0001110" else -- 145 "00011000001" when count12_s = "0001111" else -- 193 "00011001101" when count12_s = "0010000" else -- 205 "00010110101" when count12_s = "0010001" else -- 181 "00011100101" when count12_s = "0010010" else -- 229 "00011110001" when count12_s = "0010011" else -- 241 "00011011001" when count12_s = "0010100" else -- 217 "00100001001" when count12_s = "0010101" else -- 265 "00100010101" when count12_s = "0010110" else -- 277 "00011111101" when count12_s = "0010111" else -- 253 "00100101101" when count12_s = "0011000" else -- 301 "00100111001" when count12_s = "0011001" else -- 313 "00100100001" when count12_s = "0011010" else -- 289 "00101010001" when count12_s = "0011011" else -- 337 "00101011101" when count12_s = "0011100" else -- 349 "00101000101" when count12_s = "0011101" else -- 325 "00101110101" when count12_s = "0011110" else -- 373 "00110000001" when count12_s = "0011111" else -- 385 "00101101001" when count12_s = "0100000" else -- 361 "00110011001" when count12_s = "0100001" else -- 409 "00110100101" when count12_s = "0100010" else -- 421 "00110001101" when count12_s = "0100011" else -- 397 "00110111101" when count12_s = "0100100" else -- 445 "00111001001" when count12_s = "0100101" else -- 457 "00110110001" when count12_s = "0100110" else -- 433 "00111100001" when count12_s = "0100111" else -- 481 "00111101101" when count12_s = "0101000" else -- 493 "00111010101" when count12_s = "0101001" else -- 469 "01000000101" when count12_s = "0101010" else -- 517 "01000010001" when count12_s = "0101011" else -- 529 "00111111001" when count12_s = "0101100" else -- 505 "01000101001" when count12_s = "0101101" else -- 553 "01000110101" when count12_s = "0101110" else -- 565 "01000011101" when count12_s = "0101111" else -- 541 "01001001101" when count12_s = "0110000" else -- 589 "01001011001" when count12_s = "0110001" else -- 601 "01001000001" when count12_s = "0110010" else -- 577 "01001110001" when count12_s = "0110011" else -- 625 "01001111101" when count12_s = "0110100" else -- 637 "01001100101" when count12_s = "0110101" else -- 613 "01010010101" when count12_s = "0110110" else -- 661 "01010100001" when count12_s = "0110111" else -- 673 "01010001001" when count12_s = "0111000" else -- 649 "01010111001" when count12_s = "0111001" else -- 697 "01011000101" when count12_s = "0111010" else -- 709 "01010101101" when count12_s = "0111011" else -- 685 "01011011101" when count12_s = "0111100" else -- 733 "01011101001" when count12_s = "0111101" else -- 745 "01011010001" when count12_s = "0111110" else -- 721 "01100000001" when count12_s = "0111111" else -- 769 "01100001101" when count12_s = "1000000" else -- 781 "01011110101" when count12_s = "1000001" else -- 757 "01100100101" when count12_s = "1000010" else -- 805 "01100110001" when count12_s = "1000011" else -- 817 "01100011001" when count12_s = "1000100" else -- 793 "01101001001" when count12_s = "1000101" else -- 841 "01101010101" when count12_s = "1000110" else -- 853 "01100111101" when count12_s = "1000111" else -- 829 "01101101101" when count12_s = "1001000" else -- 877 "01101111001" when count12_s = "1001001" else -- 889 "01101100001" when count12_s = "1001010" else -- 865 "01110010001" when count12_s = "1001011" else -- 913 "01110011101" when count12_s = "1001100" else -- 925 "01110000101" when count12_s = "1001101" else -- 901 "01110110101" when count12_s = "1001110" else -- 949 "01111000001" when count12_s = "1001111" else -- 961 "01110101001" when count12_s = "1010000" else -- 937 "01111011001" when count12_s = "1010001" else -- 985 "01111100101" when count12_s = "1010010" else -- 997 "01111001101" when count12_s = "1010011" else -- 973 "01111111101" when count12_s = "1010100" else -- 1021 "10000001001" when count12_s = "1010101" else -- 1033 "01111110001" when count12_s = "1010110" else -- 1009 "10000100001" when count12_s = "1010111" else -- 1057 "10000101101" when count12_s = "1011000" else -- 1069 "10000010101" when count12_s = "1011001" else -- 1045 "10001000101" when count12_s = "1011010" else -- 1093 "10001010001" when count12_s = "1011011" else -- 1105 "10000111001" when count12_s = "1011100" else -- 1081 "10001101001" when count12_s = "1011101" else -- 1129 "10001110101" when count12_s = "1011110" else -- 1141 "10001011101" when count12_s = "1011111" else -- 1117 "00000000000"; -- Assigning the location values to the index3_s based on count12_s value Index3_s <= "00000011010" when count12_s = "0000000" else -- 26 "00000000010" when count12_s = "0000001" else -- 2 "00000001110" when count12_s = "0000010" else -- 14 "00000111110" when count12_s = "0000011" else -- 62 "00000100110" when count12_s = "0000100" else -- 38 "00000110010" when count12_s = "0000101" else -- 50 "00001100010" when count12_s = "0000110" else -- 98 "00001001010" when count12_s = "0000111" else -- 74 "00001010110" when count12_s = "0001000" else -- 86 "00010000110" when count12_s = "0001001" else -- 134 "00001101110" when count12_s = "0001010" else -- 110 "00001111010" when count12_s = "0001011" else -- 122 "00010101010" when count12_s = "0001100" else -- 170 "00010010010" when count12_s = "0001101" else -- 146 "00010011110" when count12_s = "0001110" else -- 158 "00011001110" when count12_s = "0001111" else -- 206 "00010110110" when count12_s = "0010000" else -- 182 "00011000010" when count12_s = "0010001" else -- 194 "00011110010" when count12_s = "0010010" else -- 242 "00011011010" when count12_s = "0010011" else -- 218 "00011100110" when count12_s = "0010100" else -- 230 "00100010110" when count12_s = "0010101" else -- 278 "00011111110" when count12_s = "0010110" else -- 254 "00100001010" when count12_s = "0010111" else -- 266 "00100111010" when count12_s = "0011000" else -- 314 "00100100010" when count12_s = "0011001" else -- 290 "00100101110" when count12_s = "0011010" else -- 302 "00101011110" when count12_s = "0011011" else -- 350 "00101000110" when count12_s = "0011100" else -- 326 "00101010010" when count12_s = "0011101" else -- 338 "00110000010" when count12_s = "0011110" else -- 386 "00101101010" when count12_s = "0011111" else -- 362 "00101110110" when count12_s = "0100000" else -- 374 "00110100110" when count12_s = "0100001" else -- 422 "00110001110" when count12_s = "0100010" else -- 398 "00110011010" when count12_s = "0100011" else -- 410 "00111001010" when count12_s = "0100100" else -- 458 "00110110010" when count12_s = "0100101" else -- 434 "00110111110" when count12_s = "0100110" else -- 446 "00111101110" when count12_s = "0100111" else -- 494 "00111010110" when count12_s = "0101000" else -- 470 "00111100010" when count12_s = "0101001" else -- 482 "01000010010" when count12_s = "0101010" else -- 530 "00111111010" when count12_s = "0101011" else -- 506 "01000000110" when count12_s = "0101100" else -- 518 "01000110110" when count12_s = "0101101" else -- 566 "01000011110" when count12_s = "0101110" else -- 542 "01000101010" when count12_s = "0101111" else -- 554 "01001011010" when count12_s = "0110000" else -- 602 "01001000010" when count12_s = "0110001" else -- 578 "01001001110" when count12_s = "0110010" else -- 590 "01001111110" when count12_s = "0110011" else -- 638 "01001100110" when count12_s = "0110100" else -- 614 "01001110010" when count12_s = "0110101" else -- 626 "01010100010" when count12_s = "0110110" else -- 674 "01010001010" when count12_s = "0110111" else -- 650 "01010010110" when count12_s = "0111000" else -- 662 "01011000110" when count12_s = "0111001" else -- 710 "01010101110" when count12_s = "0111010" else -- 686 "01010111010" when count12_s = "0111011" else -- 698 "01011101010" when count12_s = "0111100" else -- 746 "01011010010" when count12_s = "0111101" else -- 722 "01011011110" when count12_s = "0111110" else -- 734 "01100001110" when count12_s = "0111111" else -- 782 "01011110110" when count12_s = "1000000" else -- 758 "01100000010" when count12_s = "1000001" else -- 770 "01100110010" when count12_s = "1000010" else -- 818 "01100011010" when count12_s = "1000011" else -- 794 "01100100110" when count12_s = "1000100" else -- 806 "01101010110" when count12_s = "1000101" else -- 854 "01100111110" when count12_s = "1000110" else -- 830 "01101001010" when count12_s = "1000111" else -- 842 "01101111010" when count12_s = "1001000" else -- 890 "01101100010" when count12_s = "1001001" else -- 866 "01101101110" when count12_s = "1001010" else -- 878 "01110011110" when count12_s = "1001011" else -- 926 "01110000110" when count12_s = "1001100" else -- 902 "01110010010" when count12_s = "1001101" else -- 914 "01111000010" when count12_s = "1001110" else -- 962 "01110101010" when count12_s = "1001111" else -- 938 "01110110110" when count12_s = "1010000" else -- 950 "01111100110" when count12_s = "1010001" else -- 998 "01111001110" when count12_s = "1010010" else -- 974 "01111011010" when count12_s = "1010011" else -- 986 "10000001010" when count12_s = "1010100" else -- 1034 "01111110010" when count12_s = "1010101" else -- 1010 "01111111110" when count12_s = "1010110" else -- 1022 "10000101110" when count12_s = "1010111" else -- 1070 "10000010110" when count12_s = "1011000" else -- 1046 "10000100010" when count12_s = "1011001" else -- 1058 "10001010010" when count12_s = "1011010" else -- 1106 "10000111010" when count12_s = "1011011" else -- 1082 "10001000110" when count12_s = "1011100" else -- 1094 "10001110110" when count12_s = "1011101" else -- 1142 "10001011110" when count12_s = "1011110" else -- 1118 "10001101010" when count12_s = "1011111" else -- 1130 "00000000000"; -- Assigning the location values to the index4_s based on count12_s value Index4_s <= "00000001101" when count12_s = "0000000" else -- 13 "00000000001" when count12_s = "0000001" else -- 1 "00000100101" when count12_s = "0000010" else -- 37 "00000011001" when count12_s = "0000011" else -- 25 "00000111101" when count12_s = "0000100" else -- 61 "00000110001" when count12_s = "0000101" else -- 49 "00001010101" when count12_s = "0000110" else -- 85 "00001001001" when count12_s = "0000111" else -- 73 "00001101101" when count12_s = "0001000" else -- 109 "00001100001" when count12_s = "0001001" else -- 97 "00010000101" when count12_s = "0001010" else -- 133 "00001111001" when count12_s = "0001011" else -- 121 "00010011101" when count12_s = "0001100" else -- 157 "00010010001" when count12_s = "0001101" else -- 145 "00010110101" when count12_s = "0001110" else -- 181 "00010101001" when count12_s = "0001111" else -- 169 "00011001101" when count12_s = "0010000" else -- 205 "00011000001" when count12_s = "0010001" else -- 193 "00011100101" when count12_s = "0010010" else -- 229 "00011011001" when count12_s = "0010011" else -- 217 "00011111101" when count12_s = "0010100" else -- 253 "00011110001" when count12_s = "0010101" else -- 241 "00100010101" when count12_s = "0010110" else -- 277 "00100001001" when count12_s = "0010111" else -- 265 "00100101101" when count12_s = "0011000" else -- 301 "00100100001" when count12_s = "0011001" else -- 289 "00101000101" when count12_s = "0011010" else -- 325 "00100111001" when count12_s = "0011011" else -- 313 "00101011101" when count12_s = "0011100" else -- 349 "00101010001" when count12_s = "0011101" else -- 337 "00101110101" when count12_s = "0011110" else -- 373 "00101101001" when count12_s = "0011111" else -- 361 "00110001101" when count12_s = "0100000" else -- 397 "00110000001" when count12_s = "0100001" else -- 385 "00110100101" when count12_s = "0100010" else -- 421 "00110011001" when count12_s = "0100011" else -- 409 "00110111101" when count12_s = "0100100" else -- 445 "00110110001" when count12_s = "0100101" else -- 433 "00111010101" when count12_s = "0100110" else -- 469 "00111001001" when count12_s = "0100111" else -- 457 "00111101101" when count12_s = "0101000" else -- 493 "00111100001" when count12_s = "0101001" else -- 481 "01000000101" when count12_s = "0101010" else -- 517 "00111111001" when count12_s = "0101011" else -- 505 "01000011101" when count12_s = "0101100" else -- 541 "01000010001" when count12_s = "0101101" else -- 529 "01000110101" when count12_s = "0101110" else -- 565 "01000101001" when count12_s = "0101111" else -- 553 "01001001101" when count12_s = "0110000" else -- 589 "01001000001" when count12_s = "0110001" else -- 577 "01001100101" when count12_s = "0110010" else -- 613 "01001011001" when count12_s = "0110011" else -- 601 "01001111101" when count12_s = "0110100" else -- 637 "01001110001" when count12_s = "0110101" else -- 625 "01010010101" when count12_s = "0110110" else -- 661 "01010001001" when count12_s = "0110111" else -- 649 "01010101101" when count12_s = "0111000" else -- 685 "01010100001" when count12_s = "0111001" else -- 673 "01011000101" when count12_s = "0111010" else -- 709 "01010111001" when count12_s = "0111011" else -- 697 "01011011101" when count12_s = "0111100" else -- 733 "01011010001" when count12_s = "0111101" else -- 721 "01011110101" when count12_s = "0111110" else -- 757 "01011101001" when count12_s = "0111111" else -- 745 "00000000000"; process(clk, reset) begin if reset = '1' then Index1_s_d <= (others => '0'); Index2_s_d <= (others => '0'); Index3_s_d <= (others => '0'); Index4_s_d <= (others => '0'); count_off1 <= (others => '0'); count_off2 <= (others => '0'); count_off3 <= (others => '0'); count_off4 <= (others => '0'); Temp1_s <= (others => '0'); Temp2_s <= (others => '0'); Temp3_s <= (others => '0'); Temp5_s <= (others => '0'); rd_add1 <= (others => '0'); rd_count1 <= (others => '0'); rd_count2 <= (others => '0'); rd_count3 <= (others => '0'); rd_en1 <= '0'; rd_en2 <= '0'; rd_en3 <= '0'; rd_en4 <= '0'; valid_out <= '0'; elsif clk = '1' and clk'event then rd_count1 <= rd_count; rd_count2 <= rd_count1; rd_count3 <= rd_count2; rd_en1 <= rd_en; rd_en2 <= rd_en1; -- Delayed the read enable signal by rd_en3 <= rd_en2; -- 4 clocks rd_en4 <= rd_en3; valid_out <= rd_en3; rd_add1 <= rd_count2(0)&Index_out_s1; -- Generating the read address Index1_s_d <= Index1_s; Index2_s_d <= Index2_s; -- Delayed the index_s signal by 4 clocks Index3_s_d <= Index3_s; Index4_s_d <= Index4_s; count_off1_d <= count_off1; count_off1 <= Count_2nd_s; count_off2 <= Count_2nd_s - '1'; count_off3 <= Count_2nd_s - "10"; count_off4 <= Count_2nd_s - '1'; Temp1_s <= Index1_s_d + count_off1; Temp2_s <= Index2_s_d + count_off2; Temp3_s <= Index3_s_d + count_off3; Temp5_s <= Index4_s_d + count_off4; end if; end process; -- Generating the temp4_s and temp5_s based on the count_off1_d value Temp4_s <= Temp1_s when (count_off1_d = 0 or count_off1_d = 3 or count_off1_d = 6 or count_off1_d = 9) else Temp2_s when (count_off1_d = 1 or count_off1_d = 4 or count_off1_d = 7 or count_off1_d = 10) else Temp3_s when (count_off1_d = 2 or count_off1_d = 5 or count_off1_d = 8 or count_off1_d = 11) else "00000000000"; Temp6_s <= Temp5_s when ( count_off1_d = 1 or count_off1_d = 3 or count_off1_d = 5 or count_off1_d = 7 or count_off1_d = 9 or count_off1_d = 11) else Temp1_s; -- Generating the concatination value for the read address Index_out_s1 <= Temp1_s when (code_rate_rd = "0000" or code_rate_rd = "0001" or code_rate_rd = "0010") else Temp6_s when (code_rate_rd = "0011" or code_rate_rd = "0100") else Temp4_s when (code_rate_rd = "0101" or code_rate_rd = "0110") else (others => '0'); process(clk) begin if clk = '1' and clk'event then -- In this process reading the data from the RAM data_out <= ram(conv_integer(rd_add1)); end if; end process; end behavioral;