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设计组合逻辑网络,经常使用卡诺图求出逻辑表达式。当度量数目较多时,如何在卡诺图外侧(最上行和最左侧)构造出最优变量值序列,是应用卡诺图的关键。本文给出能满足要求的构造法。一、问题的提出卡诺图的设计通常是满足两个要求,一是从图中任一方格(或称单元)进入其相邻的另一方格时,只允许变量值一个数字变化,并且变量值不准重复;二是顶上一行的方格应与底下一行方格相邻,左边一列方格应与右边一列相邻。
Design combinatorial logic networks, often using Karnaugh map to find the logical expression. When the number of metrics is large, how to construct the optimal variable sequence outside the Karnaugh map (the uppermost line and the leftmost) is the key to applying Karnaugh map. This article gives the construction method to meet the requirements. First, the problem proposed Carnot map design is usually to meet the two requirements, one from the graph of any square (or unit) into its adjacent another box, only allow a variable value of the number of changes, and variables The value is not allowed to repeat; the top line of the grid should be next to the box next to the grid, the left column should be adjacent to the right column.