由触发器构成的异步计数器的一种新分析方法  

A New Analysis Method for Asynchronous Counter Based on Flip-flops

作　　者：赵显红 张晓红 张立文 Zhao Xianhong;Zhang Xiaohong;Zhang Liwen(College of Electrical Engineering, Henan University of Science and Technology, Luoyang Henan 471023,China)

机构地区：[1]河南科技大学电气工程学院,河南洛阳471023

出　　处：《山西电子技术》2020年第2期39-41,共3页Shanxi Electronic Technology

摘　　要：提出一种新的由触发器构成的异步计数器的分析方法,将计数器的时钟信号作为输入条件写入原触发器的驱动方程构成新的驱动方程,代入触发器的特征方程获得次态方程;将次态方程化为状态变量的最小项之和的标准形式,在不需要进行任何逻辑运算的前提下,实现状态转换表的填写,从而获得计数器的变化规律。该方法省去了繁琐的计算,且与传统的真值表填写方法一致,实现了与同步时序逻辑电路的分析方法的一致性。A new analysis method of asynchronous counter composed of triggers is proposed.When the clock signal of the counter is written into the driving equation of the original trigger as input condition,a new driving equation is formed,and the characteristic equation of the trigger is substituted to obtain the sub-state equation,and the sub-state equation is transformed into the standard form of the sum of the minimum terms of the state variable.Being on the new analysis method,the state transition table is implemented without any logic operations,and the change rules of the counters are also obtained.This method has not only realized to fill in the truth table as the traditional method,also omitting the complicated calculation,and is consistent with the analysis method of synchronous time-sequence logic circuits.

关 键 词：计数器 异步时序逻辑电路 触发器 次态方程 真值表 

分 类 号：TN79[电子电信—电路与系统]