vhld case 实现38译码器
时间: 2024-05-25 15:06:58 浏览: 14
VHDL(VHSIC Hardware Description Language)是一种硬件描述语言,用于描述数字电路的结构和行为。38译码器是一种常见的译码器,用于将3位二进制输入信号转换为8位输出信号。下面是一个使用VHDL实现38译码器的示例:
```vhdl
-- 38译码器实现
library ieee;
use ieee.std_logic_1164.all;
entity Decoder38 is
port (
input : in std_logic_vector(2 downto 0);
output : out std_logic_vector(7 downto 0)
);
end entity Decoder38;
architecture Behavioral of Decoder38 is
begin
process(input)
begin
case input is
when "000" =>
output <= "00000001";
when "001" =>
output <= "00000010";
when "010" =>
output <= "00000100";
when "011" =>
output <= "00001000";
when "100" =>
output <= "00010000";
when "101" =>
output <= "00100000";
when "110" =>
output <= "01000000";
when "111" =>
output <= "10000000";
when others =>
output <= "00000000";
end case;
end process;
end architecture Behavioral;
```
上述代码定义了一个名为Decoder38的实体,具有一个3位输入端口(input)和一个8位输出端口(output)。在行为体(Behavioral)中,使用了一个process过程来根据输入信号的不同值进行译码,并将对应的输出信号赋值给output端口。