quartus ii 18.0六路抢答器VHDL

抢答器是一种常见的电子设备，可以用于各种竞赛或者考试等场合。Quartus II是一款常用的数字电路设计软件，可以用于抢答器的设计。下面是一个六路抢答器的VHDL代码示例：

library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;

entity quiz_buzzer is
    port (
        clk: in std_logic;
        reset: in std_logic;
        buzzer: out std_logic_vector(5 downto 0);
        button: in std_logic_vector(5 downto 0)
    );
end entity quiz_buzzer;

architecture rtl of quiz_buzzer is
    signal counter: unsigned(15 downto 0);
    signal winner: std_logic_vector(5 downto 0);
begin
    process(clk, reset)
    begin
        if reset = '1' then
            counter <= (others => '0');
            winner <= (others => '0');
            buzzer <= (others => '0');
        elsif rising_edge(clk) then
            if counter = 0 then
                buzzer <= (others => '0');
                winner <= button;
                counter <= 10000;
            else
                counter <= counter - 1;
                if button /= winner then
                    buzzer <= winner;
                end if;
            end if;
        end if;
    end process;
end architecture rtl;

这个抢答器的设计中，有一个时钟信号clk和一个复位信号reset。当reset信号为高电平时，计数器counter、胜者winner和蜂鸣器buzzer都会被清零。当clk信号上升沿到来时，计数器counter会递减，如果计数器counter的值为0，则会将当前按下的按钮的编号存储到胜者winner中，并将计数器counter的值设为10000。在接下来的10000个时钟周期内，如果有其他的按钮按下，则会触发蜂鸣器buzzer响起，并且胜者winner的编号会一直显示在LED上，直到下一次比赛开始。