Electronics Workbench Circuit File
Version: 5
Charset: ANSI
Description: 
"        如圖所示，它是由4個(gè)JK觸發(fā)器構(gòu)成的異步8421BCD計(jì)數(shù)器。" 
"        若初始狀態(tài)Q^n4Q^n3Q^n2Q^n1=0000，在CP脈沖作用下Q^n+1=1，Q1為上跳使后3級(jí)觸發(fā)器都保持不變。再將0001作為當(dāng)前狀態(tài)，第二個(gè)CP脈沖使Q^n+11=0，Q1的下降沿送到CP2和CP4處。J2=Q^n4反=1，K2=1則Q^n+12=1，Q2上跳使Q3保持不變，而J4=1，K4=1，因此Q1下跳使Q4置0也不變，狀態(tài)變?yōu)?010。" 
"        當(dāng)Q^n4Q^n3Q^n2Q^n1=1001時(shí)，CP的作用使Q^n+1=0，Q1由1變0使CP2和CP4下跳，此時(shí)J2=Q4=0，J4=0，K4=0，則Q2保持0不變，而Q4由1變?yōu)?狀態(tài)，Q2狀態(tài)不變使Q3也保持不變，其下一狀態(tài)為0000回到初始狀態(tài)。由狀態(tài)表可見電路實(shí)現(xiàn)了8421BCD計(jì)數(shù)。" 
"         異步8421BCD計(jì)數(shù)器狀態(tài)轉(zhuǎn)移表：序號(hào)	Q4	Q3	Q2	Q1" 
"				  0	  0	  0	  0	  0" 
"				  1	  0	  0	  0	  1" 
"				  2	  0	  0	  1	  0" 
"				  3	  0	  0	  1	  1" 
"				  4	  0	  1	  0	  0" 
"				  5	  0	  1	  0	  1" 
"				  6	  0	  1	  1	  0	" 
"				  7	  0	  1	  1	  1" 
"				  8	  1	  0	  0	  0" 
"				  9	  1	  0	  0	  1" 

EncryptionType: 2
UsingVectorGraphics: 0
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