计数器自启动反馈逻辑电路的圆图化简

CIRCLE DIAGRAM SIMPLIFYING OF LOGICALFEEDBACK CIRCUIT IN COUNTER'S AUTO-STARTING

在计数器中 ,当电路的状态没有被全部利用 ,就会有多余状态 ,即异常时序 .为使计数器进入正常时序 ,利用正常时序和异常时序组成的反馈函数真值表 ,根据转换的要求 ,用逻辑函数的圆图法进行化简 ,本方法与卡诺图化简相比 ,具有包围圈少、直观。

When the states of a circuit are not used completely in a counter, extra states will be left, which is called abnormal time sequence. In order to change the counter into normal time sequence, a truth value table of feedback function composed of normal time sequence and abnormal time sequence is often used. The table is often simplified with circle diagram method of logical function according to the transfer requirement. Compared with karnaugh map method, this method has many advantages such as few of surrounding lap number, direct-view, simple and so on.