“10”检测器的有限状态机VHDL代码及测试代码
时间: 2023-09-14 18:08:14 浏览: 44
以下是一个“10”检测器的有限状态机VHDL代码及测试代码的示例:
1. 有限状态机VHDL代码
```
library ieee;
use ieee.std_logic_1164.all;
entity detector is
port (
clk : in std_logic;
reset : in std_logic;
input : in std_logic;
output : out std_logic
);
end detector;
architecture fsm of detector is
type state_type is (s0, s1, s2, s3); -- 定义状态类型
signal state : state_type := s0; -- 定义状态信号
begin
process (clk, reset)
begin
if reset = '1' then -- 复位状态机
state <= s0;
output <= '0';
elsif rising_edge(clk) then -- 处理时钟上升沿
case state is
when s0 => -- 状态0
if input = '1' then
state <= s1;
else
state <= s0;
end if;
when s1 => -- 状态1
if input = '0' then
state <= s2;
else
state <= s1;
end if;
when s2 => -- 状态2
if input = '1' then
state <= s3;
output <= '1'; -- 检测到了"10",设置输出
else
state <= s0;
end if;
when s3 => -- 状态3
state <= s0;
end case;
end if;
end process;
end fsm;
```
该代码实现了一个“10”检测器的有限状态机,通过时钟信号和输入信号来控制状态机的状态转移,最终输出检测结果。
2. 测试代码
```
library ieee;
use ieee.std_logic_1164.all;
entity detector_tb is
end detector_tb;
architecture testbench of detector_tb is
constant CLK_PERIOD : time := 10 ns; -- 时钟周期
signal clk : std_logic := '0'; -- 时钟信号
signal reset : std_logic := '1'; -- 复位信号
signal input : std_logic := '0'; -- 输入信号
signal output : std_logic; -- 输出信号
component detector is
port (
clk : in std_logic;
reset : in std_logic;
input : in std_logic;
output : out std_logic
);
end component;
begin
-- 实例化被测模块
uut : detector
port map (
clk => clk,
reset => reset,
input => input,
output => output
);
-- 时钟信号
clk_process : process
begin
while now < 100 ns loop
clk <= '0';
wait for CLK_PERIOD / 2;
clk <= '1';
wait for CLK_PERIOD / 2;
end loop;
wait;
end process;
-- 复位信号
reset_process : process
begin
reset <= '1';
wait for 10 ns;
reset <= '0';
wait;
end process;
-- 输入信号
input_process : process
begin
input <= '0';
wait for 20 ns;
input <= '1';
wait for 10 ns;
input <= '0';
wait for 10 ns;
input <= '1';
wait for 10 ns;
input <= '0';
wait;
end process;
-- 输出信号
output_process : process
begin
wait until rising_edge(clk);
assert output = '0' report "Error: output should be '0'" severity error;
wait until rising_edge(clk);
assert output = '0' report "Error: output should be '0'" severity error;
wait until rising_edge(clk);
assert output = '0' report "Error: output should be '0'" severity error;
wait until rising_edge(clk);
assert output = '1' report "Error: output should be '1'" severity error;
wait;
end process;
end testbench;
```
该测试代码中,实例化了一个名为`detector`的被测模块,并且通过`port map`将测试中的信号与被测模块的输入输出信号进行连接。
同时,该测试代码中还包含了时钟信号、复位信号、输入信号和输出信号的处理过程,并且使用`assert`语句来判断被测模块的输出结果是否符合预期。
需要注意的是,以上代码只是一个简单的测试示例,具体的测试代码需要根据被测模块的具体实现进行调整和修改。