红绿灯的状态机ss用两段式、三段式代码用vhdl
时间: 2023-10-26 08:03:24 浏览: 50
红绿灯是交通指示灯的一种,它通过不同的颜色(红、绿)来告知司机何时停车或行驶。状态机是一种所见即所得的图形工具,用于表示系统的状态和状态之间的转换。以下是关于红绿灯状态机的两段式和三段式代码示例,使用VHDL语言编写。
两段式代码示例:
```vhdl
-- 红绿灯状态机(两段式)
library ieee;
use ieee.std_logic_1164.all;
entity traffic_light is
port (
clk: in std_logic;
rst: in std_logic;
red_light: out std_logic;
green_light: out std_logic
);
end traffic_light;
architecture Behavioral of traffic_light is
type state_type is (stop_state, go_state);
signal current_state: state_type;
begin
process (clk, rst)
begin
if rst = '1' then
current_state <= stop_state;
elsif rising_edge(clk) then
case current_state is
when stop_state =>
red_light <= '1';
green_light <= '0';
current_state <= go_state;
when go_state =>
red_light <= '0';
green_light <= '1';
current_state <= stop_state;
when others =>
red_light <= '0';
green_light <= '0';
current_state <= stop_state;
end case;
end if;
end process;
end Behavioral;
```
三段式代码示例:
```vhdl
-- 红绿灯状态机(三段式)
library ieee;
use ieee.std_logic_1164.all;
entity traffic_light is
port (
clk: in std_logic;
rst: in std_logic;
red_light: out std_logic;
yellow_light: out std_logic;
green_light: out std_logic
);
end traffic_light;
architecture Behavioral of traffic_light is
type state_type is (stop_state, prepare_state, go_state);
signal current_state: state_type;
begin
process (clk, rst)
begin
if rst = '1' then
current_state <= stop_state;
elsif rising_edge(clk) then
case current_state is
when stop_state =>
red_light <= '1';
yellow_light <= '0';
green_light <= '0';
current_state <= prepare_state;
when prepare_state =>
red_light <= '1';
yellow_light <= '1';
green_light <= '0';
current_state <= go_state;
when go_state =>
red_light <= '0';
yellow_light <= '0';
green_light <= '1';
current_state <= stop_state;
when others =>
red_light <= '0';
yellow_light <= '0';
green_light <= '0';
current_state <= stop_state;
end case;
end if;
end process;
end Behavioral;
```
以上是基于VHDL语言编写的红绿灯状态机两段式和三段式的代码示例。这些代码可以在FPGA或ASIC设备上实现红绿灯控制。具体的硬件平台和开发环境可以根据需求进行适当调整和修改。