Question

使用我的VHDL代码提供帮助尝试使用IF语句选择输入到输出的输入使用WITH XXX选择

是选择 d和e 是4输入 y是输出

帮助感谢

LIBRARY IEEE;
USE IEEE.STD_LOGIC_1164.all;



ENTITY mux_4_1 IS
PORT(
S : in STD_LOGIC;
d : IN STD_LOGIC_VECTOR (3 downto 0);
e : IN STD_LOGIC_VECTOR (3 downto 0);
y : OUT STD_LOGIC_VECTOR (0 to 6));



END mux_4_1;

ARCHITECTURE behavior OF mux_4_1 is
BEGIN
PROCESS(S,d,e)
BEGIN
   IF S = '0' THEN

      WITH d SELECT

      y <=      "1111110" WHEN "0000",--0
                "0110000" WHEN "0001",--1
                "1101101" WHEN "0010",--2
                "1111001" WHEN "0011",--3
                "0110011" WHEN "0100",--4
                "1011011" WHEN "0101",--5
                "1011111" WHEN "0110",--6
                "1110000" WHEN "0111",--7
                "1111111" WHEN "1000",--8
                "1111011" WHEN "1001",--9
                 "0000000" when others;



ELSE S = '1' THEN

      WITH e SELECT

      y <=      "1111110" WHEN "0000",--0
                "0110000" WHEN "0001",--1
                "1101101" WHEN "0010",--2
                "1111001" WHEN "0011",--3
                "0110011" WHEN "0100",--4
                "1011011" WHEN "0101",--5
                "1011111" WHEN "0110",--6
                "1110000" WHEN "0111",--7
                "1111111" WHEN "1000",--8
                "1111011" WHEN "1001",--9
                 "0000000" when others;


END IF;
END PROCESS;
END behavior;

错误（10500）：mux_4_1.vhd（23）处文本“WITH”附近的VHDL语法错误;期望“结束”，或“（”或标识符（“with”是保留关键字）或顺序语句
错误（10500）：mux_4_1.vhd（25）处文本“WHEN”附近的VHDL语法错误;期待“;”

Answer 1

我从你所给出的内容中唯一的错误就是在then陈述之后没有else。

VHDL代码IF语句也使用With XXX选择

1 个答案: