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【简答题】
试用JK触发器设计一个2位同步二进制多功能计数器。当控制端XY=00时，计数器状态不变；XY=01时，为加法计数；XY=10时，为减法计数；XY=11时，则次态为现态求反运算。试写出该计数电路的控制输入真值表(包括状态转换激励表)，并画出用与非门和JK触发器实现这一控制的逻辑电路图。
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