逻辑函数化简的教学难点与应对方法

Teaching Difficulties and Approach of the Logic Function Simplification

逻辑函数化简是"数字逻辑电路"课程的基础内容。教学中发现,学生使用卡诺图化简时常常找不到所有的逻辑相邻项,在理解逻辑函数的约束项和任意项的文字描述时也存在困难。本文采用立体图形表示逻辑函数,方便寻找逻辑相邻项,并以交通信号灯电路为例,解释了约束项和任意项的含义。

Simplification of logic functions is a basic content of the Digital Logic Circuit course. It is found in actu- al teaching that the students often have difficulties in finding all the logic neighboring items of the Karnaugh maps, and understanding the text description of the bound items and arbitrary items. This paper uses three-dimensional geometry to represent the logic functions, which facilitates the validation of logic adjacent items. In addition, taking the traffic lights circuit as an example, this paper explains the meaning of the bound items and the arbitrary items.