J-K Flip flop , initial state supposition ?

Thread Starter

Xufyan

Joined Aug 3, 2010
114
According to the table,

J=0 , k=1 = RESET
J=1 , k=0 = SET

but see this JK Flip flop,
initially when i suppose Q=0 (Reset), J=0 and K=1 and apply the first clock pulse then there are three input in gate 1,

Q(bar) =1 , J=0 and Clock =1 this will make the the output of Gate 1 equals to '0' and the output of gate three become '1' (because Qbar is 1)

but this is a wrong state :confused: Q must be equal to 0 when 'J' and 'K' equals to '0' and '1' respectively.



I am just confused what should be the initial supposition for the J and K. ?

any advice ?
 

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Ron H

Joined Apr 14, 2005
7,063
According to the table,

J=0 , k=1 = RESET
J=1 , k=0 = SET

but see this JK Flip flop,
initially when i suppose Q=0 (Reset), J=0 and K=1 and apply the first clock pulse then there are three input in gate 1,

Q(bar) =1 , J=0 and Clock =1 this will make the the output of Gate 1 equals to '0' <snip>

When J=0, the output of gate 1 will always be 1.
 
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