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cosine_rom.vhdl
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library IEEE;
use IEEE.STD_LOGIC_1164.all;
entity cos is
port (
address : in std_logic_vector(6 downto 0);
data : out real
);
end entity cos;
architecture cos_arch of cos is
type mem is array ( 0 to 99) of real;
constant my_rom : mem := (
0 =>1.0,
1 =>0.998026728428272,
2 =>0.992114701314478,
3 =>0.982287250728689,
4 =>0.968583161128631,
5 =>0.951056516295154,
6 =>0.929776485888251,
7 =>0.904827052466020,
8 =>0.876306680043864,
9 =>0.844327925502015,
10 =>0.809016994374948,
11 =>0.770513242775789,
12 =>0.728968627421412,
13 =>0.684547105928689,
14 =>0.637423989748690,
15 =>0.587785252292473,
16 =>0.535826794978997,
17 =>0.481753674101715,
18 =>0.425779291565073,
19 =>0.368124552684678,
20 =>0.309016994374947,
21 =>0.248689887164855,
22 =>0.187381314585725,
23 =>0.125333233564304,
24 =>0.0627905195293133,
25 =>6.12323399573677e-17,
26 =>-0.0627905195293134,
27 =>-0.125333233564304,
28 =>-0.187381314585725,
29 =>-0.248689887164855,
30 =>-0.309016994374947,
31 =>-0.368124552684678,
32 =>-0.425779291565073,
33 =>-0.481753674101715,
34 =>-0.535826794978996,
35 =>-0.587785252292473,
36 =>-0.637423989748690,
37 =>-0.684547105928689,
38 =>-0.728968627421411,
39 =>-0.770513242775789,
40 =>-0.809016994374947,
41 =>-0.844327925502015,
42 =>-0.876306680043864,
43 =>-0.904827052466020,
44 =>-0.929776485888251,
45 =>-0.951056516295154,
46 =>-0.968583161128631,
47 =>-0.982287250728689,
48 =>-0.992114701314478,
49 =>-0.998026728428272,
50 =>-1.0,
51 =>-0.998026728428272,
52 =>-0.992114701314478,
53 =>-0.982287250728689,
54 =>-0.968583161128631,
55 =>-0.951056516295154,
56 =>-0.929776485888252,
57 =>-0.904827052466020,
58 =>-0.876306680043864,
59 =>-0.844327925502015,
60 =>-0.809016994374948,
61 =>-0.770513242775790,
62 =>-0.728968627421412,
63 =>-0.684547105928689,
64 =>-0.637423989748690,
65 =>-0.587785252292474,
66 =>-0.535826794978997,
67 =>-0.481753674101715,
68 =>-0.425779291565073,
69 =>-0.368124552684679,
70 =>-0.309016994374948,
71 =>-0.248689887164856,
72 =>-0.187381314585726,
73 =>-0.125333233564305,
74 =>-0.0627905195293141,
75 =>-1.83697019872103e-16,
76 =>0.0627905195293128,
77 =>0.125333233564303,
78 =>0.187381314585724,
79 =>0.248689887164854,
80 =>0.309016994374946,
81 =>0.368124552684677,
82 =>0.425779291565072,
83 =>0.481753674101715,
84 =>0.535826794978996,
85 =>0.587785252292472,
86 =>0.637423989748689,
87 =>0.684547105928688,
88 =>0.728968627421411,
89 =>0.770513242775789,
90 =>0.809016994374947,
91 =>0.844327925502015,
92 =>0.876306680043864,
93 =>0.904827052466019,
94 =>0.929776485888251,
95 =>0.951056516295154,
96 =>0.968583161128631,
97 =>0.982287250728689,
98 =>0.992114701314478,
99 =>0.998026728428272);
begin
process (address)
begin
case address is
when "0000000" => data <= my_rom(0);
when "0000001" => data <= my_rom(1);
when "0000010" => data <= my_rom(2);
when "0000011" => data <= my_rom(3);
when "0000100" => data <= my_rom(4);
when "0000101" => data <= my_rom(5);
when "0000110" => data <= my_rom(6);
when "0000111" => data <= my_rom(7);
when "0001000" => data <= my_rom(8);
when "0001001" => data <= my_rom(9);
when "0001010" => data <= my_rom(10);
when "0001011" => data <= my_rom(11);
when "0001100" => data <= my_rom(12);
when "0001101" => data <= my_rom(13);
when "0001110" => data <= my_rom(14);
when "0001111" => data <= my_rom(15);
when "0010000" => data <= my_rom(16);
when "0010001" => data <= my_rom(17);
when "0010010" => data <= my_rom(18);
when "0010011" => data <= my_rom(19);
when "0010100" => data <= my_rom(20);
when "0010101" => data <= my_rom(21);
when "0010110" => data <= my_rom(22);
when "0010111" => data <= my_rom(23);
when "0011000" => data <= my_rom(24);
when "0011001" => data <= my_rom(25);
when "0011010" => data <= my_rom(26);
when "0011011" => data <= my_rom(27);
when "0011100" => data <= my_rom(28);
when "0011101" => data <= my_rom(29);
when "0011110" => data <= my_rom(30);
when "0011111" => data <= my_rom(31);
when "0100000" => data <= my_rom(32);
when "0100001" => data <= my_rom(33);
when "0100010" => data <= my_rom(34);
when "0100011" => data <= my_rom(35);
when "0100100" => data <= my_rom(36);
when "0100101" => data <= my_rom(37);
when "0100110" => data <= my_rom(38);
when "0100111" => data <= my_rom(39);
when "0101000" => data <= my_rom(40);
when "0101001" => data <= my_rom(41);
when "0101010" => data <= my_rom(42);
when "0101011" => data <= my_rom(43);
when "0101100" => data <= my_rom(44);
when "0101101" => data <= my_rom(45);
when "0101110" => data <= my_rom(46);
when "0101111" => data <= my_rom(47);
when "0110000" => data <= my_rom(48);
when "0110001" => data <= my_rom(49);
when "0110010" => data <= my_rom(50);
when "0110011" => data <= my_rom(51);
when "0110100" => data <= my_rom(52);
when "0110101" => data <= my_rom(53);
when "0110110" => data <= my_rom(54);
when "0110111" => data <= my_rom(55);
when "0111000" => data <= my_rom(56);
when "0111001" => data <= my_rom(57);
when "0111010" => data <= my_rom(58);
when "0111011" => data <= my_rom(59);
when "0111100" => data <= my_rom(60);
when "0111101" => data <= my_rom(61);
when "0111110" => data <= my_rom(62);
when "0111111" => data <= my_rom(63);
when "1000000" => data <= my_rom(64);
when "1000001" => data <= my_rom(65);
when "1000010" => data <= my_rom(66);
when "1000011" => data <= my_rom(67);
when "1000100" => data <= my_rom(68);
when "1000101" => data <= my_rom(69);
when "1000110" => data <= my_rom(70);
when "1000111" => data <= my_rom(71);
when "1001000" => data <= my_rom(72);
when "1001001" => data <= my_rom(73);
when "1001010" => data <= my_rom(74);
when "1001011" => data <= my_rom(75);
when "1001100" => data <= my_rom(76);
when "1001101" => data <= my_rom(77);
when "1001110" => data <= my_rom(78);
when "1001111" => data <= my_rom(79);
when "1010000" => data <= my_rom(80);
when "1010001" => data <= my_rom(81);
when "1010010" => data <= my_rom(82);
when "1010011" => data <= my_rom(83);
when "1010100" => data <= my_rom(84);
when "1010101" => data <= my_rom(85);
when "1010110" => data <= my_rom(86);
when "1010111" => data <= my_rom(87);
when "1011000" => data <= my_rom(88);
when "1011001" => data <= my_rom(89);
when "1011010" => data <= my_rom(90);
when "1011011" => data <= my_rom(91);
when "1011100" => data <= my_rom(92);
when "1011101" => data <= my_rom(93);
when "1011110" => data <= my_rom(94);
when "1011111" => data <= my_rom(95);
when "1100000" => data <= my_rom(96);
when "1100001" => data <= my_rom(97);
when "1100010" => data <= my_rom(98);
when "1100011" => data <= my_rom(99);
when others => data <= 0.0;
end case;
end process;
end cos_arch;