vhdl数字示波器代码
时间: 2023-10-10 20:16:05 浏览: 42
以下是一个简单的VHDL数字示波器代码示例:
```
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.NUMERIC_STD.ALL;
entity oscilloscope is
Port ( clk : in STD_LOGIC;
reset : in STD_LOGIC;
data_in : in STD_LOGIC_VECTOR (7 downto 0);
data_out : out STD_LOGIC_VECTOR (7 downto 0);
trigger_level : in STD_LOGIC_VECTOR (7 downto 0);
trigger_edge : in STD_LOGIC;
trigger_channel : in STD_LOGIC;
data_ready : out STD_LOGIC);
end oscilloscope;
architecture Behavioral of oscilloscope is
type state_type is (idle, wait_trigger, capture_data);
signal state : state_type := idle;
signal sample_count : integer := 0;
signal trigger_count : integer := 0;
signal data_buffer : std_logic_vector(255 downto 0);
signal trigger_buffer : std_logic_vector(255 downto 0);
begin
process(clk, reset)
begin
if reset = '1' then
state <= idle;
sample_count <= 0;
trigger_count <= 0;
data_buffer <= (others => '0');
trigger_buffer <= (others => '0');
data_ready <= '0';
elsif rising_edge(clk) then
case state is
when idle =>
if trigger_edge = '1' then
if trigger_channel = '1' then
if data_in >= trigger_level then
state <= wait_trigger;
end if;
else
if data_in <= trigger_level then
state <= wait_trigger;
end if;
end if;
end if;
when wait_trigger =>
if trigger_edge = '0' then
state <= capture_data;
else
if trigger_channel = '1' then
if data_in < trigger_level then
state <= idle;
end if;
else
if data_in > trigger_level then
state <= idle;
end if;
end if;
end if;
when capture_data =>
if sample_count < 256 then
data_buffer(sample_count * 8 + 7 downto sample_count * 8) <= data_in;
trigger_buffer(sample_count * 8 + 7 downto sample_count * 8) <= trigger_level;
sample_count <= sample_count + 1;
else
data_ready <= '1';
state <= idle;
end if;
end case;
end if;
end process;
data_out <= data_buffer((255 - sample_count) * 8 + 7 downto (255 - sample_count) * 8);
trigger_level <= trigger_buffer((255 - sample_count) * 8 + 7 downto (255 - sample_count) * 8);
end Behavioral;
```
这是一个基于状态机的示波器实现,它使用一个8位的数据输入端口和一个8位的数据输出端口来捕获数据。它还有一个触发电平输入端口、一个触发边沿输入端口和一个触发通道输入端口,用于控制何时捕获数据并何时停止捕获数据。此外,它还有一个时钟输入端口和一个复位输入端口,用于控制状态机的操作。