求状恋方程 J/K触发器的特性方程: T=Jo"+Ko 将各触发器的驱动方程代入,即得电路的状态方程: Q2+=J22+K22=Q2+Q2=Q1 O =J,Q"+K2= 2"+202=20 Q+1=J+K0=2"+gg=Q2
2 求状态方程 JK触发器的特性方程： n n n Q = JQ + KQ +1 将各触发器的驱动方程代入，即得电路的状态方程： = + = + = = + = + = = + = + = + + + n n n n n n n n n n n n n n n n n n n n n n n n Q J Q K Q Q Q Q Q Q Q J Q K Q Q Q Q Q Q Q J Q K Q Q Q Q Q Q 0 0 0 0 2 0 2 0 2 1 0 1 1 1 1 0 1 0 1 0 1 1 2 2 2 2 1 2 1 2 1 1 2
计算、列状态表 n+1 现态 次态 输出 0+l=Oo O2 0n"00 o n+1 er 2 n+1 0=n Q n+1 000001 0 20 000 10 000 n+ O00 n+1 10000 n+1 10 0 0 0000 Y=0 0
现 态 次 态 输 出 n n n Q2 Q1 Q0 1 0 1 1 1 2 n+ n+ n+ Q Q Q Y 3 计算、列状态表 n n n n n n n n Y Q Q Q Q Q Q Q Q 1 2 2 1 0 0 1 1 1 1 2 = = = = + + + 0 0 0 0 0 1 0 1 0 0 1 1 1 0 0 1 0 1 1 1 0 1 1 1 0 0 1 0 1 1 1 0 1 1 1 1 0 0 0 0 1 0 1 0 0 1 1 0 0 0 0 0 1 1 0 0 0 0 0 0 1 0 0 1 0 1 1 1 2 = = = = = = + + + Y Q Q Q n n n 0 0 0 0 1 1 0 1 0 1 1 1 2 = = = = = = + + + Y Q Q Q n n n 0 0 0 0 1 0 1 1 0 1 1 1 2 = = = = = = + + + Y Q Q Q n n n 0 0 0 0 1 1 1 1 0 1 1 1 2 = = = = = = + + + Y Q Q Q n n n 0 1 1 1 0 0 0 1 0 1 1 1 2 = = = = = = + + + Y Q Q Q n n n 0 1 1 1 0 1 0 1 0 1 1 1 2 = = = = = = + + + Y Q Q Q n n n 0 0 0 1 0 0 1 1 0 1 1 1 2 = = = = = = + + + Y Q Q Q n n n 0 0 0 1 0 1 1 1 0 1 1 1 2 = = = = = = + + + Y Q Q Q n n n
画状态图、时序图 排列顺序: /Y 222120 000→001→011 /0 /1↑ ↓/0 010 101 100←110←111 /0/0 (a)有效循环 (b)无效循环 状态图
4 画状态图、时序图 000→001→011 /1↑ ↓/0 100←110←111 /0 /0 /0 /0 (a) 有效循环 010 101 (b) 无效循环 /0 /1 排列顺序： /Y n n n Q2 Q1 Q0 状态图