代码如下，用max plus II 调试的时候总是出现：Error：Node 'cp3' missing sourceLIBRARY IEEE;USE IEEE.STD_LOGIC_1164.ALL;ENTITY DCO ISPORT(a,b,clk:IN STD_LOGIC;cp3:OUT STD_LOGIC);END DCO;ARCHITECTURE bhv OF DCO ISTYPE FSM_ST is(S0,S1,S2);SIGNAL current_state,next_state:FSM ...