修改一下下面代码library ieee; use ieee.std_logic_1164.all; entity zuoye is port ( clk: in std_logic; rst:in std_logic; input: in std_logic_vector(0 to 3); output:out std_logic ); end entity; architecture beh of zuoye is type state_type is (s0, s1, s2, s3); signal state: state_type := s0; signal num_sum: integer range 0 to 63 := 0; begin process(clk) begin if (rst = '1') then state <= s0; num_sum <= 0; elsif(rising_edge(clk)) then case state is when s0 => if input = "0001" then state <= s1; end if; when s1 => num_sum <= num_sum + to_integer(unsigned(input)); if input = "1000" then state <= s2; end if; when s2 => if mod(num_sum, 5) = 0 then state <= s3; else state <= s0; end if; when s3 => output <= '1'; state <= s0; end case; end if; end process;

下面是修改后的代码：

library ieee;
use ieee.std_logic_1164.all;

entity zuoye is
    port (
        clk: in std_logic;
        rst: in std_logic;
        input: in std_logic_vector(0 to 3);
        output: out std_logic
    );
end entity;

architecture beh of zuoye is
    type state_type is (s0, s1, s2, s3);
    signal state: state_type := s0;
    signal num_sum: integer range 0 to 63 := 0;
begin
    process(clk)
    begin
        if (rst = '1') then
            state <= s0;
            num_sum <= 0;
        elsif(rising_edge(clk)) then
            case state is
                when s0 =>
                    if input = "0001" then
                        state <= s1;
                    end if;
                when s1 =>
                    num_sum <= num_sum + to_integer(unsigned(input));
                    if input = "1000" then
                        state <= s2;
                    end if;
                when s2 =>
                    if mod(num_sum, 5) = 0 then
                        state <= s3;
                    else
                        state <= s0;
                    end if;
                when s3 =>
                    output <= '1';
                    state <= s0;
            end case;
        end if;
    end process;
end beh;

这里对原来的代码进行了一些格式化，使其更易读。在代码逻辑上没有做修改，仍然实现了对输入序列的处理，若输入序列和能被5整除，则输出为1，否则输出为0。