BCD计数器VHDL
时间: 2023-09-28 15:12:38 浏览: 53
以下是一个简单的基于VHDL的BCD计数器的实现:
```vhdl
entity bcd_counter is
port (
clk : in std_logic;
reset : in std_logic;
count_en : in std_logic;
count : out std_logic_vector(3 downto 0)
);
end entity;
architecture bcd_counter_arch of bcd_counter is
signal bcd_count : std_logic_vector(3 downto 0) := "0000";
begin
process(clk, reset)
begin
if reset = '1' then
bcd_count <= "0000";
elsif rising_edge(clk) then
if count_en = '1' then
bcd_count <= bcd_count + 1;
end if;
end if;
end process;
count <= bcd_count;
end architecture;
```
这个计数器使用4位BCD计数器来计数,其中`reset`信号用于清零计数器,`count_en`信号用于使计数器递增。在时钟的上升沿时,计数器会检查`count_en`信号是否为1,如果是,则将计数器的值加1。计数器的当前值通过`count`输出信号返回。