Flip Flops Flashcards
How is the D flip flop gotten from SR flip flop?
A branch is made in the S-input. This branch is then inverted (passed through a NOT gate) and then fed to the R-input.
What is the working principle behind a T flip flop and it’s circuit diagram?
The T flip flop is simply an edit of the JK, where both J and K-inputs now share the same input, the ‘T’ input, with nothing else done.
How do you design a synchronous counter?
- Decide on the number and type of flip flop to use.
- Draw the excitation table.
- Draw the state diagram.
- Draw the circuit excitation table and simplify using K-map.
- Draw the logic diagram/circuit.
What are the ripple and parallel counters?
Ripple: asynchronous.
Parallel: synchronous.
For asynchronous counter, how do the positive and negative edge triggered clocks work?
Positive: after feeding the clock input to the first flip flop, the Q’ output feeds into the clock input for the second one. Doing this produces down counter.
Negative: clock to FF, Q to next flip flop clock. Also, doing this produces up counter.
For asynchronous counters, where are the MSB and LSB?
MSB is at the last flip flop. LSB is at the first, where regular clock input is fed.
