Question

我在quartus上遇到有关语法错误的错误，但找不到它：该程序是8位的通用加法器

     LIBRARY ieee;
     USE ieee.std_logic_1164.all;

     ENTITY big_adder IS
     PORT (a, b: IN STD_LOGIC_VECTOR(31 DOWNTO 0);
     cin: IN STD_LOGIC;
     sum: OUT STD_LOGIC_VECTOR(31 DOWNTO 0);
     cout: OUT STD_LOGIC);
     END big_adder;

     ARCHITECTURE big_adder OF big_adder IS
     SIGNAL carry: STD_LOGIC_VECTOR(8 DOWNTO 0);

     COMPONENT carry_lookahead_adder IS
     PORT (a, b: IN STD_LOGIC_VECTOR(3 DOWNTO 0);
     cin: IN STD_LOGIC;
     sum: OUT STD_LOGIC_VECTOR(3 DOWNTO 0);
     cout: OUT STD_LOGIC);
     END COMPONENT;

     BEGIN
     carry(0) <= cin;
     gen_adder: FOR i IN 1 TO 8 GENERATE
        adder: carry_lookahead_adder PORT MAP(a(4*i–1 DOWNTO 4*i–4), b(4*i–1 DOWNTO 4*i–4), carry(i–1), sum(4*i–1 DOWNTO 4*i–4), carry(i));
     END GENERATE;
     cout <= carry(8);
     END big_adder;big_adder;

Answer 1

语法看起来有效，除了最后一行

     END big_adder;big_adder;

您必须删除“ big_adder;”之一。

一个私人提示：从第一天起，您就应该训练自己编写干净的代码！

错误（10500）：文本“”附近的big_adder.vhd（24）处的VHDL语法错误；期待“）”或“，”

1 个答案: