vhdl有限状态机交通灯
时间: 2023-07-13 15:22:29 浏览: 56
好的,我可以为您解答这个问题。
下面是一个基于 VHDL 的交通灯有限状态机的代码示例:
```vhdl
library ieee;
use ieee.std_logic_1164.all;
entity traffic_light is
port(
clk: in std_logic;
reset: in std_logic;
go: out std_logic;
caution: out std_logic;
stop: out std_logic
);
end entity traffic_light;
architecture fsm of traffic_light is
type state_type is (go_state, caution_state, stop_state);
signal state: state_type;
begin
process(clk, reset)
begin
if reset = '1' then
state <= stop_state;
elsif rising_edge(clk) then
case state is
when go_state =>
go <= '1';
caution <= '0';
stop <= '0';
state <= caution_state;
when caution_state =>
go <= '0';
caution <= '1';
stop <= '0';
state <= stop_state;
when stop_state =>
go <= '0';
caution <= '0';
stop <= '1';
state <= go_state;
end case;
end if;
end process;
end architecture fsm;
```
这个有限状态机包含三个状态:go_state、caution_state和stop_state,分别对应绿灯、黄灯和红灯。在每个状态下,输出的信号会设置为对应状态的灯亮起,而其他灯则熄灭。时钟信号 clk 用于驱动状态机的状态转换,而复位信号 reset 则用于将状态机重置为初始状态。输出信号 go、caution 和 stop 分别对应绿灯、黄灯和红灯。
希望这个代码示例能够对您有所帮助!如果您还有其他问题,可以继续向我提问。