sequential (91) - no realistic serial input (Flip flop) stable

 https://wodewangzhishime.blogspot.com/2023/12/sequential-90-enabling-line.html

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Ref: https://wodewangzhishime.blogspot.com/2023/12/sequential-90-enabling-line.html.

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John : Of the 2 picture above,  which picture is correct?

Me: Logically,  the 1st picture is correct. 

John : The 2nd picture is correct too. 

Me: In the circuit of data flip flop, we have the following,

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When set and reset is

1-0 -> 1

0-1 -> 0

0-0 -> remain the same. 

1-1 -> toggle or illegal. 

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Me: In the 2nd picture,  A and B are saturated.  The data flip flop will toggle.

John : Yes,.

Me: Toggle us invalid. 

John : Yes, it's invalid.