各位大人们:下面的程序是我找的一个用来熟悉quartusII的,在仿真的时候总要出错: Error: Can't continue simulation because delay annotation information for design is missing 请高手们指点一下,把时序约束说一下. library ieee;
use ieee.std_logic_1164.all;
entity air_conditioner is
port(clk ,temp_high,temp_low:in std_logic;
heat,cool: out std_logic);
end air_conditioner;
architecture style of air_conditioner is
type state is(just_right,too_cold,too_hot);
signal now_state,next_state: state;
begin
process(now_state,temp_high,temp_low)
begin
case now_state is
when just_right=>heat<='0';cool<='0';
if(temp_low='1') then
next_state<=too_cold;
elsif(temp_high='1') then
next_state<=too_hot;
else
next_state<=just_right;
end if;
when too_cold=>heat<='1' ;cool<='0';
if(temp_low='1') then
next_state<=too_cold;
elsif(temp_high='1') then
next_state<=too_hot;
else
next_state<=just_right;
end if;
when too_hot=>heat<='0' ;cool<='1';
if(temp_low='1') then
next_state<=too_cold;
elsif(temp_high='1') then
next_state<=too_hot;
else
next_state<=just_right;
end if;
end case;
end process;
process(clk)
begin
if(clk'event and clk='1') then
now_state<=next_state;
end if;
end process;
end style; | 
