同步二进制减法器.ewb

Multisim2001软件的仿真电路实例261例

Electronics Workbench Circuit File
Version: 5
Charset: ANSI
Description: 
"         与加法器相反，计数器的计数值不是随着计数脉冲的输入递增，而是递减，这就是减法计数器。根据2进制减法规则可知，在从多位2进制数减1时，若第i位以下各位全部为0，则应向第i位发出借位信号，使第i位翻转，同时第i位以下各位都由0变为1。该图是一个同步2进制减法计数器，它用3个下降沿触发的JK触发器构成，其中各级触发器的激励信号为：" 
"          J1=1	J2=[Q1^n]`		J3=[Q2^n]`[Q1^n]`" 
"          K1=1	K2=[Q1^n]`		K3=[Q2^n]`[Q1^n]`" 
"          三位二进制计数器的状态转移表：" 
"          序			原状态			次状态" 
"          号		Q3	Q2	Q1	Q3	Q2	Q1" 
"          0		 0	 0	 0	 1	 1	 1" 
"          1		 1	 1	 1	 1 	 1	 0" 
"          2		 1	 1	 0	 1	 0	 1" 
"          3		 1	 0	 1	 1	 0	 0" 
"          4	 	 1	 0	 0	 0	 1	 1" 
"          5	 	 0	 1	 1	 0	 1	 0" 
"          6	 	 0	 1	 0	 0	 0	 1" 
"          7		 0	 0	 1	 0	 0	 0" 

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