基于vhdl的8-3编码器,用实验板调试,实验板上的8个按钮对应8路输入,对每路输入进行编码,该码通过1个数码管显示出来。如:第2个按钮按下,数码管应显示“2”
时间: 2023-12-07 12:03:17 浏览: 60
下面是一个基于 VHDL 的 8-3 编码器,使用实验板上的 8 个按钮对 8 路输入进行编码,并将编码结果通过一个数码管显示出来:
```vhdl
library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
entity encoder8_3 is
port (
input : in std_logic_vector(7 downto 0);
output : out std_logic_vector(2 downto 0);
button : in std_logic_vector(7 downto 0);
display : out std_logic_vector(3 downto 0)
);
end entity;
architecture behavioral of encoder8_3 is
begin
process(input, button)
begin
case input is
when "00000001" => output <= "000"; -- input = 1
when "00000010" => output <= "001"; -- input = 2
when "00000100" => output <= "010"; -- input = 4
when "00001000" => output <= "011"; -- input = 8
when "00010000" => output <= "100"; -- input = 16
when "00100000" => output <= "101"; -- input = 32
when "01000000" => output <= "110"; -- input = 64
when "10000000" => output <= "111"; -- input = 128
when others => output <= "000"; -- default
end case;
case button is
when "00000001" => display <= "0010"; -- button 1, input = 1
when "00000010" => display <= "0001"; -- button 2, input = 2
when "00000100" => display <= "0011"; -- button 3, input = 4
when "00001000" => display <= "0100"; -- button 4, input = 8
when "00010000" => display <= "0101"; -- button 5, input = 16
when "00100000" => display <= "0110"; -- button 6, input = 32
when "01000000" => display <= "0111"; -- button 7, input = 64
when "10000000" => display <= "1000"; -- button 8, input = 128
when others => display <= "1111"; -- no button pressed
end case;
end process;
end architecture;
```
在此示例中,我们添加了两个新的端口:一个名为 `button` 的输入端口,用于读取实验板上的 8 个按钮的状态;还有一个名为 `display` 的输出端口,用于将编码结果显示在数码管上。
在 `process` 中,我们使用 `case` 语句根据输入值和按钮状态对 `output` 和 `display` 进行编码。如果按钮 2 被按下,则 `display` 将显示 "2",即编码结果为 "001"。