我想添加的2的产出在一起，并显示他们的结果在第三/第四显示在7段显示。 每个输出显示在他们自己的分段分别。 第四显示正在一个双位数(最大值为14,Min正在为0)。 我得到一个错误说明，我需要写的所有实例的情况下"添加"。 不知道该去哪里离这里。 任何帮助表示赞赏。
LIBRARY IEEE;
USE IEEE.STD_LOGIC_1164.ALL;
ENTITY Midterm2_Q2_4369 IS
PORT (
SW: IN STD_LOGIC_VECTOR(2 DOWNTO 0);
SW0: IN STD_LOGIC_VECTOR(2 DOWNTO 0);
ADD: IN STD_LOGIC_VECTOR(6 DOWNTO 0);
Y: OUT STD_LOGIC_VECTOR(6 DOWNTO 0);
Y0: OUT STD_LOGIC_VECTOR(6 DOWNTO 0);
Y1: OUT STD_LOGIC_VECTOR(6 DOWNTO 0);
Y2: OUT STD_LOGIC_VECTOR(6 DOWNTO 0));
END Midterm2_Q2_4369;
ARCHITECTURE MUX8 OF Midterm2_Q2_4369 IS
BEGIN
PROCESS (SW,SW0,ADD)
BEGIN
CASE SW IS
WHEN "000" => Y <= "0000001";
WHEN "001" => Y <= "1001111";
WHEN "010" => Y <= "0010010";
WHEN "011" => Y <= "0000110";
WHEN "100" => Y <= "1001100";
WHEN "101" => Y <= "0100100";
WHEN "110" => Y <= "0100000";
WHEN "111" => Y <= "0001111";
END CASE;
CASE SW0 IS
WHEN "000" => Y0 <= "0000001";
WHEN "001" => Y0 <= "1001111";
WHEN "010" => Y0 <= "0010010";
WHEN "011" => Y0 <= "0000110";
WHEN "100" => Y0 <= "1001100";
WHEN "101" => Y0 <= "0100100";
WHEN "110" => Y0 <= "0100000";
WHEN "111" => Y0 <= "0001111";
END CASE;
CASE ADD IS
WHEN "0000000" => Y1 <= "0000001"; --0
WHEN "0000001" => Y1 <= "1001111"; --1
WHEN "0000010" => Y1 <= "0010010"; --2
WHEN "0000011" => Y1 <= "0000110"; --3
WHEN "0000100" => Y1 <= "1001100"; --4
WHEN "0000101" => Y1 <= "0100100"; --5
WHEN "0000110" => Y1 <= "0100000"; --6
WHEN "0000111" => Y1 <= "0001111"; --7
WHEN "0001111" => Y1 <= "0000000"; --8
WHEN "0010111" => Y1 <= "0000100"; --9
--8421421
WHEN "0011111" => Y2 <= "1001111"; --(1)0
WHEN "0100111" => Y2 <= "1001111"; --(1)1
WHEN "0101111" => Y2 <= "1001111"; --(1)2
WHEN "0110111" => Y2 <= "1001111"; --(1)3
WHEN "0111111" => Y2 <= "1001111"; --(1)4--
WHEN "1000111" => Y2 <= "1001111"; --(1)5
WHEN "1001111" => Y2 <= "1001111"; --(1)6
WHEN "1010111" => Y2 <= "1001111"; --(1)7--
WHEN "1011111" => Y2 <= "1001111"; --(1)8
WHEN "1100111" => Y2 <= "1001111"; --(1)9
END CASE;
END PROCESS;
END MUX8;