Question about a Flip Flop circuit

Hello! I am confused in a question I found on youtube. I have uploaded the screen shots.
He told that with respect to S and R we have to write the change from Q to Q+( next state). But I am not getting it. How he wrote Q+ states?Is he considering that when S=1 , we have to set the circuit i.e on Q , 1 will be stored and the circuit will be set and vice versa? But this is a nand latch right? S is above R and infront of S there is Q. So it is a nand latch in which when S=1 Q is 0 . Thanks


Last edited:


Science Advisor
When the F/F is clocked the state of S and R are copied through to Q and Qbar respectively.
If x is different to Q then the next state will be 1, which is the XOR function.
Answer (c); Q+ = x XOR Q.

Want to reply to this thread?

"Question about a Flip Flop circuit" You must log in or register to reply here.

Physics Forums Values

We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weaknesses
• Solo and co-op problem solving

Hot Threads