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数电——Multisim仿真两位乘法器
两位乘法器设计
* 实验目的
掌握组合逻辑电路的分析和设计方法,以及仿真测试方法。
* 实验原理
本实验使用了两个74HC138和1个三输入与非门、1个四输入与非门、一个六输入与非门和1个非门
* 实验内容
(一)、分析功能
两位乘法器的二进制运算方法:设输入端两位二进制数分别为A1、A0和B1、B0,其输出端乘法结果表示为:P3、P2、P1 、P0
;用二进制的乘法运算方法可以写出真值表,接着利用真值表可以直接写出各个输出端的最小项表达式;
(二)列真值表
两位乘法器功能真值表
A1
A0
B1
B0
P3
P2
P1
P0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
0
1
1
0
0
0
0
0
1
0
0
0
0
0
0
0
1
0
1
0
0
0
1
0
1
1
0
0
0
1
0
0
1
1
1
0
0
1
1
1
0
0
0
0
0
0
0
1
0
0
1
0
0
1
0
1
0
1
0
0
1
0
0
1
0
1
1
0
1
1
0
1
1
0
0
0
0
0
0
1
1
0
1
0
0
1
1
1
1
1
0
0
1
1
0
1
1
1
1
1
0
0
1
(三)写逻辑表达式
由真值表可知输出端的最小项表达式:
P3=m15=L15
P2=m14+m11+m10=L14·L11·L10
P1=m14+m13+m11+m9+m7+m6=L14·L13·L11·L9·L7·L6
P0=m15+m13+m7+m5=L15·L13·L7·L5
(四)画逻辑电路图
图1 两位乘法器逻辑电路图
(五)仿真电路设计
* 实验结果及分析
输出端用电灯泡亮代表输出为1,不亮代表0;输入端用5v电源输入代表1,由上图输入端输入了1111,输出端为1001,结果正确。