下面程序中为什么提示："condition clause and timeout clause together in a wait statement is not supported"?请高手指导。
---------------测试基准--------------------------
LIBRARY IEEE;
USE IEEE.STD_LOGIC_1164.ALL;
USE IEEE.STD_LOGIC_ARITH.ALL;
USE IEEE.STD_LOGIC_UNSIGNED.ALL;
-------------------------------------------------
ENTITY TB_CLK_DIV IS
END TB_CLK_DIV;
-------------------------------------------------
ARCHITECTURE TESTBENCH OF TB_CLK_DIV IS
COMPONENT CLK_DIV
PORT(CLK: IN STD_LOGIC;
RST: IN STD_LOGIC;
CLK_2D: OUT STD_LOGIC;
CLK_4D: OUT STD_LOGIC;
CLK_8D: OUT STD_LOGIC;
CLK_16D: OUT STD_LOGIC);
END COMPONENT;
SIGNAL CLK: STD_LOGIC:='1';
SIGNAL RST: STD_LOGIC:='1';
SIGNAL CLK_2D: STD_LOGIC;
SIGNAL CLK_4D: STD_LOGIC;
SIGNAL CLK_8D: STD_LOGIC;
SIGNAL CLK_16D: STD_LOGIC;
BEGIN
PROCESS
BEGIN
WAIT FOR 50 NS;CLK<=NOT CLK;
END PROCESS;
RST<= '0' AFTER 200 NS;
TEST: CLK_DIV
PORT MAP(CLK,RST,CLK_2D,CLK_4D,CLK_8D,CLK_16D);
END TESTBENCH;
------------------------------------------------- |
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