计数器.ewb

Multisim2001软件的仿真电路实例261例

Electronics Workbench Circuit File
Version: 5
Charset: ANSI
Description: 
"         该图是由三个JK触发器构成的，各级触发器受同一时钟CP控制为一同步时序电路，X为控制输入信号。这个电路实现了计数的功能，计数的对象是时钟CP的个数。当X=0时，电路中的状态代码与输入CP个数成加一计数关系。在一个循环周期内共有6个状态，也就是可以计数到6个CP脉冲，我们称此时计数的长度（模长）为6。输出Z可以看做是计数时的进位信号，当输入5个CP，电路中的代码是101（5）时，Z=1，当输入第6个CP，电路回到000状态（初始状态），Z由1变0，产生进位信号。当X=1时，可以看出，电路也完成计数功能，不过计数模长为5并且初态为001。" 
"        电路状态转移表：" 
"                                                      初态	  	                 次态" 
"         X		Q3	Q2	Q1	Q3	Q2	Q1	Z" 
"         0		 0	 0	 0	 0	 0	 1	0" 
"         0		 0	 0	 1	 0	 1	 0	0" 
"         0		 0	 1	 0	 0	 1	 1	0" 
"         0		 0	 1	 1	 1	 0	 0	0" 
"         0		 1	 0	 0	 1	 0	 1	0" 
"         0		 1	 0	 1	 0	 0	 0	1" 
"         1		 0	 0	 1	 0	 1	 0	0" 
"         1		 0	 1	 0	 0	 1	 1	0" 
"         1		 0	 1	 1	 1	 0	 0	0" 
"         1		 1	 0	 0	 1	 0	 1	0" 
"         1		 1	 0	 1	 0	 0	 1	1" 

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