3.功能表(function Table) Excitation Present Next Active High Input put state state Note R Qn On+1 0 0 0 0 unchanged On+1 0 0 1 1 状态不变 0 0 Set置1 0 0 1 1 R 0 0 1 1 Reset清0 X Uncertain Not allowed 4.特征方程 Q+1=S+RO S·R=0(约束条件) 3. 功能表 (function Table) R S Qn Qn+1 0 0 0 0 0 0 1 1 0 1 0 1 0 1 1 1 1 00 1 1 0 1 1 1 1 0 X 1 1 1 X Excitation input Present state Next state Reset 清0 Set 置1 unchanged 状态不变 Uncertain Not allowed Note Qn+1 R S Qn 0 1 1 1 0 0 X X 4. 特征方程 Active High Input     0RS 1n QRSQ n (约束条件)