作业帮求高手修改一下EDA的课程设计 数字秒表；控制模块出了问题LIBRARY IEEE;USE IEEE.STD_LOGIC_1164.ALL;USE IEEE.STD_LOGIC_UNSIGNED.ALL;ENTITY CTRL ISPORT(CLR,CLK,SP:IN STD_LOGIC;EN :OUT STD_LOGIC);END;ARCHITECTURE BEHAVE OF CTRL ISCO
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求高手修改一下EDA的课程设计 数字秒表；控制模块出了问题
LIBRARY IEEE;
USE IEEE.STD_LOGIC_1164.ALL;
USE IEEE.STD_LOGIC_UNSIGNED.ALL;
ENTITY CTRL IS
PORT(CLR,CLK,SP:IN STD_LOGIC;
EN :OUT STD_LOGIC);
END;
ARCHITECTURE BEHAVE OF CTRL IS
CONSTANT S0 :STD_LOGIC_VECTOR(1 DOWNTO 0) := "00";
CONSTANT S1 :STD_LOGIC_VECTOR(1 DOWNTO 0) := "01";
CONSTANT S2 :STD_LOGIC_VECTOR(1 DOWNTO 0) := "11";
CONSTANT S3 :STD_LOGIC_VECTOR(1 DOWNTO 0) := "10";
TYPE STATES IS (S0,S1,S2,S3);
SIGNAL CURRENT_STATE,NEXT_STATE:STATES;
BEGIN
错误提示在倒数第3行，Error (10465):VHDL error at CTRL.vhd(13):name "S0" cannot be used because it is already used for a previously declared item
Error (10465):VHDL error at CTRL.vhd(13):name "S1" cannot be used because it is already used for a previously declared item
下周5要交了，我已经弄了一周了，还是没改成功，
s0已经被用过了 给它起个别的名字 ss0
你的程序有很大的问题，你告诉我具体题目要求。我帮你找错。