Transposedformfirfilterinvhdl

将VHDL中的转置形式FIR滤波器实现为以下代码示例：

entity fir_filter_transposed is generic( coef_size : integer := 5; -- 滤波器系数数量 input_size : integer := 16 -- 输入数据位数 ); port( clk : in std_logic; -- 时钟信号 reset : in std_logic; -- 复位信号 input : in std_logic_vector(input_size - 1 downto 0); -- 输入数据 output : out std_logic_vector(input_size - 1 downto 0) -- 输出数据 ); end entity fir_filter_transposed;

architecture rtl of fir_filter_transposed is type coef_array is array(0 to coef_size - 1) of std_logic_vector(input_size - 1 downto 0); -- 滤波器系数数组 signal coef : coef_array := (others => (others => '0')); -- 初始化滤波器系数为0 signal y : std_logic_vector(input_size - 1 downto 0); -- 根据转置形式的结构，需要记录y的值作为下一次的输入 begin

-- 确定滤波器系数，此处假定为所有系数相同 process(reset) begin if reset = '1' then coef <= (others => (others => '0')); else coef <= (others => input); -- 输入数据作为滤波器系数 end if; end process;

-- 处理y的值，即滤波器的输出 process(clk) begin if rising_edge(clk) then y <= input; -- 更新y的值 output <= (others => '0'); -- 初始化输出为0 for i in 0 to coef_size - 1 loop output <= output + coef(i) * y; -- 按照