用VHDL编写数字正弦信号生成程序
时间: 2023-05-27 12:07:50 浏览: 49
以下是一个简单的 VHDL 数字正弦信号生成程序:
```
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.NUMERIC_STD.ALL;
entity sine_generator is
Port ( clk : in STD_LOGIC;
rst : in STD_LOGIC;
sine_out : out STD_LOGIC_VECTOR (7 downto 0));
end sine_generator;
architecture Behavioral of sine_generator is
constant N : integer := 256; -- 正弦波表的大小
constant PI : real := 3.14159265358979323846;
type sine_table_type is array (0 to N-1) of integer range 0 to 255;
constant sine_table : sine_table_type := (
128, 131, 134, 137, 140, 143, 146, 149, 152, 155, 158, 162, 165, 168, 171, 174,
177, 180, 183, 186, 189, 192, 195, 198, 201, 204, 207, 210, 213, 216, 219, 222,
225, 228, 231, 234, 237, 240, 242, 245, 248, 250, 253, 255, 258, 260, 263, 265,
268, 270, 272, 275, 277, 279, 281, 283, 285, 287, 289, 291, 292, 294, 296, 297,
299, 300, 302, 303, 304, 306, 307, 308, 309, 310, 311, 312, 313, 313, 314, 315,
315, 316, 316, 316, 316, 316, 316, 316, 315, 315, 315, 314, 313, 313, 312, 311,
310, 309, 308, 307, 306, 304, 303, 302, 300, 299, 297, 296, 294, 292, 291, 289,
287, 285, 283, 281, 279, 277, 275, 272, 270, 268, 265, 263, 260, 258, 255, 253,
250, 248, 245, 242, 240, 237, 234, 231, 228, 225, 222, 219, 216, 213, 210, 207,
204, 201, 198, 195, 192, 189, 186, 183, 180, 177, 174, 171, 168, 165, 162, 158,
155, 152, 149, 146, 143, 140, 137, 134, 131, 128, 125, 122, 119, 116, 113, 110,
107, 104, 101, 98, 94, 91, 88, 85, 82, 79, 76, 73, 70, 67, 64, 61, 58, 55, 52,
49, 46, 43, 40, 37, 34, 31, 28, 25, 22, 19, 16, 13, 10, 7, 4, 1, -2, -5, -8, -11,
-14, -17, -20, -23, -26, -29, -32, -35, -38, -41, -44, -47, -50, -53, -56, -59,
-62, -65, -67, -70, -73, -76, -79, -82, -85, -88, -91, -94, -98, -101, -104,
-107, -110, -113, -116, -119, -122, -125, -128, -131, -134, -137, -140, -143,
-146, -149, -152, -155, -158, -162, -165, -168, -171, -174, -177, -180, -183,
-186, -189, -192, -195, -198, -201, -204, -207, -210, -213, -216, -219, -222,
-225, -228, -231, -234, -237, -240, -242, -245, -248, -250, -253, -255, -258,
-260, -263, -265, -268, -270, -272, -275, -277, -279, -281, -283, -285, -287,
-289, -291, -292, -294, -296, -297, -299, -300, -302, -303, -304, -306, -307,
-308, -309, -310, -311, -312, -313, -313, -314, -315, -315, -316, -316, -316,
-316, -316, -316, -316, -315, -315, -315, -314, -313, -313, -312, -311, -310,
-309, -308, -307, -306, -304, -303, -302, -300, -299, -297, -296, -294, -292,
-291, -289, -287, -285, -283, -281, -279, -277, -275, -272, -270, -268, -265,
-263, -260, -258, -255, -253, -250, -248, -245, -242, -240, -237, -234, -231,
-228, -225, -222, -219, -216, -213, -210, -207, -204, -201, -198, -195, -192,
-189, -186, -183, -180, -177, -174, -171, -168, -165, -162, -158, -155, -152,
-149, -146, -143, -140, -137, -134, -131, -128, -125, -122, -119, -116, -113,
-110, -107, -104, -101, -98, -94, -91, -88, -85, -82, -79, -76, -73, -70, -67,
-64, -61, -58, -55, -52, -49, -46, -43, -40, -37, -34, -31, -28, -25, -22, -19,
-16, -13, -10, -7, -4, -1);
signal phase_accumulator : unsigned(7 downto 0) := (others => '0'); -- 相位累加器
begin
sine_gen_proc: process(clk, rst)
begin
if rst = '1' then -- 复位
phase_accumulator <= (others => '0');
sine_out <= (others => '0');
elsif rising_edge(clk) then -- 时钟上升沿
phase_accumulator <= phase_accumulator + to_unsigned(1, phase_accumulator'length); -- 相位累加
sine_out <= std_logic_vector(to_unsigned(sine_table(to_integer(phase_accumulator * 2.0 * PI / N)), sine_out'length)); -- 输出正弦波值
end if;
end process sine_gen_proc;
end Behavioral;
```
该程序使用了一个正弦波表,以及一个相位累加器来生成一个连续的数字正弦信号。在每个时钟周期上升沿时,相位累加器增加一个固定的值,然后使用正弦波表计算出对应的正弦波值,并将其输出。程序还包括一个复位信号,用于在需要时将相位累加器和输出信号清零。
相关推荐















