各位大侠，这是怎么回事啊？ 大侠

猪贝贝

程序是书上的例子，怎么会显示如下错误啊，错误不知怎么改啊？大家帮帮我啊，先谢过了

猪贝贝

entity box2 is
port(S:in std_logic_vector(3 downto 0);
Mut std_logic_vector(3 downto 0));
end box2;

architecture Behavioral of box2 is

begin
with S select
M<="1111" when "0001",
"1110" when "0010",
"1101" when "0011",
"1100" when "0100",
"1011" when "0101",
"1010" when "0110",
"1001" when "0111",
"1000" when "1000",
"0111" when "1001",
"0110" when "1010",
"0101" when "1011",
“0100" when "1100",
"0011" when "1101",
"0010" when "1110",
"0001" when "1111",
"0000" when others; 

end Behavioral;

猪贝贝

显示的错误是下面

silverwolf7516

你好，你发的帖子有些问题，我删除了，请你编辑一下再发送上来，另外，是不是论坛有错误啊？？怎么一下发了3个帖子？？

猪贝贝

=========================================================================
* HDL Compilation *
=========================================================================
Compiling vhdl file "D:/PLL/box2.vhd" in Library work.
ERROR:HDLParsers:163 - "D:/PLL/box2.vhd" Line 39. Unexpected symbol read: ?
ERROR:HDLParsers:163 - "D:/PLL/box2.vhd" Line 39. Unexpected symbol read: .
ERROR:HDLParsers:163 - "D:/PLL/box2.vhd" Line 40. Unexpected symbol read: ?
ERROR:HDLParsers:163 - "D:/PLL/box2.vhd" Line 40. Unexpected symbol read: .
ERROR:HDLParsers:163 - "D:/PLL/box2.vhd" Line 42. Unexpected symbol read: ?
ERROR:HDLParsers:163 - "D:/PLL/box2.vhd" Line 42. Unexpected symbol read: .
ERROR:HDLParsers:163 - "D:/PLL/box2.vhd" Line 43. Unexpected symbol read: ?
ERROR:HDLParsers:163 - "D:/PLL/box2.vhd" Line 43. Unexpected symbol read: .
ERROR:HDLParsers:163 - "D:/PLL/box2.vhd" Line 44. Unexpected symbol read: ?
ERROR:HDLParsers:163 - "D:/PLL/box2.vhd" Line 44. Unexpected symbol read: .
ERROR:HDLParsers:163 - "D:/PLL/box2.vhd" Line 45. Unexpected symbol read: ?
ERROR:HDLParsers:163 - "D:/PLL/box2.vhd" Line 45. Unexpected symbol read: .
ERROR:HDLParsers:163 - "D:/PLL/box2.vhd" Line 46. Unexpected symbol read: ?
ERROR:HDLParsers:163 - "D:/PLL/box2.vhd" Line 46. Unexpected symbol read: .
ERROR:HDLParsers:163 - "D:/PLL/box2.vhd" Line 47. Unexpected symbol read: ?
ERROR:HDLParsers:163 - "D:/PLL/box2.vhd" Line 47. Unexpected symbol read: .
ERROR:HDLParsers:163 - "D:/PLL/box2.vhd" Line 48. Unexpected symbol read: ?
ERROR:HDLParsers:163 - "D:/PLL/box2.vhd" Line 48. Unexpected symbol read: .
ERROR:HDLParsers:163 - "D:/PLL/box2.vhd" Line 49. Unexpected symbol read: ?
ERROR:HDLParsers:163 - "D:/PLL/box2.vhd" Line 49. Unexpected symbol read: .
ERROR:HDLParsers:163 - "D:/PLL/box2.vhd" Line 50. Unexpected symbol read: ?
ERROR:HDLParsers:163 - "D:/PLL/box2.vhd" Line 50. Unexpected symbol read: .
ERROR:HDLParsers:163 - "D:/PLL/box2.vhd" Line 51. Unexpected symbol read: ?
ERROR:HDLParsers:163 - "D:/PLL/box2.vhd" Line 51. Unexpected symbol read: .
ERROR:HDLParsers:163 - "D:/PLL/box2.vhd" Line 52. Unexpected symbol read: ?
ERROR:HDLParsers:163 - "D:/PLL/box2.vhd" Line 52. Unexpected symbol read: .
ERROR:HDLParsers:163 - "D:/PLL/box2.vhd" Line 53. Unexpected symbol read: ?
ERROR:HDLParsers:163 - "D:/PLL/box2.vhd" Line 53. Unexpected symbol read: .
ERROR:HDLParsers:163 - "D:/PLL/box2.vhd" Line 54. Unexpected symbol read: ?
ERROR: XST failed
Process "Check Syntax" did not complete.

猪贝贝

哦，实在抱歉，呵呵，我刚三次单独发的，实在抱歉，论坛应该每错误的

猪贝贝

哦，实在抱歉，呵呵，我刚三次单独发的，实在抱歉，论坛应该每错误的

猪贝贝

哦，实在抱歉，呵呵，我刚三次单独发的，实在抱歉，论坛应该每错误的

silverwolf7516

这次怎么又是三个呢？？怪了！

猪贝贝

错误显示里的39行是M<="1111" when "0001",
54行是指"0000" when others; 小女实在是不知从哪里下手改啊，望各位不吝赐教。谢谢拉

猪贝贝

试过了，还是这样的问题啊，每办法啊。有谁知道的吗？

猪贝贝

错误显示的是什么意思啊，各位大侠给侃侃啊，谢谢先。

stone133

你的问题是：
1。没有声明库
2。里面的一个符号（“和"是不一样的）全角和半角弄错了；
更改后的：
LIBRARY ieee;
USE ieee.std_logic_1164.ALL;

entity box2 is
port(S:in std_logic_vector(3 downto 0);
Mut std_logic_vector(3 downto 0));
end box2;

architecture Behavioral of box2 is

begin
with S select
M<="1111" when "0001",
"1110" when "0010",
"1101" when "0011",
"1100" when "0100",
"1011" when "0101",
"1010" when "0110",
"1001" when "0111",
"1000" when "1000",
"0111" when "1001",
"0110" when "1010",
"0101" when "1011",
"0100" when "1100",
"0011" when "1101",
"0010" when "1110",
"0001" when "1111",
"0000" when others;

end Behavioral;

stone133

我是用maxplus编译仿真了一下，更改后结果是对的。
lz好象用的不是这个软件，是ise吗？他的提示有点不直观

猪贝贝

是的，我用的是ISE7。1，那我试试