基于逻辑函数修改技术的N进制同步计数器设计

Design of Module-N Synchronous Counters Based on Logic Function Modification Technique

为简化自启动任意进制同步计数器的设计过程,探讨了用逻辑函数修改技术设计基于JK触发器的能自启动的任意进制同步计数器的设计方法。即在由JK触发器构成的同步二进制计数器的基础上,通过修改部分触发器的激励函数方程改变计数器状态转换的顺序实现N进制计数。给出了触发器激励函数修改的原则和修改函数的确定方法,并分析了N进制计数器的自启动功能。该方法具有方便、快捷的特点和较强的实用意义。

In order to find a simple method to design arbitrary synchronous counters,the logic function modification technique in designing any module-N synchronous counters consisting of J-K flip-flops were analyzed.Based on binary synchronous counters composed of J-K flip-flops,a part of the excitation function equations are modified.Thus the state transition sequence can be changed to achieve module-N synchronous counters.Principles for excitation function modification and determination of modified functions are outlined.Self-starting of module-N synchronous counters is also analyzed.This proposed technique is simple,convenient and more practicable.