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通过后的程序

library ieee; use ieee.std_logic_1164.all; use ieee.std_logic_arith.all; use ieee.std_logic_unsigned.all; entity ch_2 is port( cs : in std_logic; in3 : in std_logic_vector(2 downto 0); out8 : out std_logic_vector(7 downto 0) ); end ch_2; architecture a of ch_2 is begin p1:process (cs,in3) begin if (cs = '0') then case in3 is when "000" => out8<="00000001"; when "001" => out8<="00000010"; when "010" => out8<="00000100"; when "011" => out8<="00001000"; when "100" => out8<="00010000"; when "101" => out8<="00100000"; when "110" => out8<="01000000"; when "111" => out8<="10000000"; when others => out8<="0000000"; end case; else out8 <= "11111111"; end if; end process p1; end a;
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