3.功能表(Function Table) Function Table:The relationship among inputs, present state (Qh )and next state (Qn+1). Excitation Present Next input state state R S Qn O+1 0 0 0 Reset(清0) 0 1 1 Set(置1) 0 keep unchanged 1 (状态不变) 0 0 0 X Uncertain(不定) 0 0 X Not allowed 3.功能表 ( Function Table ) 0 0 0 X 0 0 1 X R S Qn Qn+1 0 1 0 0 0 1 1 0 1 0 0 1 1 0 1 1 1 1 0 0 1 1 1 1 Excitation input Present state Next state Reset ( 清0 ) Set ( 置1 ) keep unchanged （状态不变） Uncertain(不定) Not allowed Function Table: The relationship among inputs, present state (Qn )and next state (Qn+1)