如果process里面改为
com:process(spe,current_state,reset)
begin
if reset'event and reset='1' then
next_state<=s3;
en<='0';
elsif current_state = s0 then en <='0';
if spe='1' then next_state<=s0;
else next_s上海注册公司tate<=s1;
end if;
elsif current_state = s1 then en <='1';
if spe='1' then next_state<=s2;
else next_state<=s1;
end if;
elsif current_state = s2 then en <='1';
if spe='1' then next_state<=s2;
else next_state<=s3;
end if;
elsif current_state = s3 then en <='0';
if spe='1' then next_state<=s0;
else next_state<=s3;
end if;
end if;
end process;
则提示
process clocking is too complex
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