fpga4-16译码器vhdl
时间: 2024-05-13 07:21:02 浏览: 23
以下是FPGA上的4-16译码器的VHDL代码:
```
library ieee;
use ieee.std_logic_1164.all;
entity decoder_4_16 is
port(
enable: in std_logic;
in_data: in std_logic_vector(3 downto 0);
out_data: out std_logic_vector(15 downto 0)
);
end entity decoder_4_16;
architecture Behavioral of decoder_4_16 is
begin
process(enable, in_data)
begin
if enable = '1' then
case in_data is
when "0000" => out_data <= "0000000000000001";
when "0001" => out_data <= "0000000000000010";
when "0010" => out_data <= "0000000000000100";
when "0011" => out_data <= "0000000000001000";
when "0100" => out_data <= "0000000000010000";
when "0101" => out_data <= "0000000000100000";
when "0110" => out_data <= "0000000001000000";
when "0111" => out_data <= "0000000010000000";
when "1000" => out_data <= "0000000100000000";
when "1001" => out_data <= "0000001000000000";
when "1010" => out_data <= "0000010000000000";
when "1011" => out_data <= "0000100000000000";
when "1100" => out_data <= "0001000000000000";
when "1101" => out_data <= "0010000000000000";
when "1110" => out_data <= "0100000000000000";
when "1111" => out_data <= "1000000000000000";
when others => out_data <= (others => '0');
end case;
else
out_data <= (others => '0');
end if;
end process;
end Behavioral;
```
该代码使用process语句和case语句来实现4-16译码器的逻辑。输入包括一个使能信号和一个4位输入信号,输出为一个16位输出信号。当使能信号为高电平时,根据输入信号的值选择相应的输出信号。如果使能信号为低电平,则输出信号为全零。如果输入信号的值不在0到15之间,则输出信号也为全零。