Digital FAQs-Interview Questions and Answers

This page covers very useful Digital FAQs for those appearing for interview. These questions are also useful as viva questions.

Following is a list of digital FAQs.

1) Explain the difference between FIFO and memory ?

2) What is the difference between a flip-flop and a latch?

3) What is setup and hold time, what will happen if there is a setup and hold violation, how to avoid this?

4) What is skew?

5) What is slack?

6) Implement a buffer and an inverter using only 2 xor gates?

7) Implement a 4:1 mux using only 2:1 mux?

8) What is the Difference between mealy and Moore machine?

9) Which is the coding used for state machines, to represent states, binary, one hot or gray coding ?

10) How to get the maximum operation frequency of a circuit?

11) What is critical path?

12) Implement a 4 input NAND gate using only 2 input NAND gates ?

13) What is the difference between Synchronous and Asynchronous reset? Explain wit example

14) Convert a SR flip flop to a JK flip flop and JK flip flop to D flip flop?

15) Implement all basic gates using a 2:1 Mux?

16) In a 4 bit Johnson counter what are the unused states?

17) Design a circuit to divide input frequency by 2.

18) Design a divide-by-3 sequential circuit with 50% duty cycle?

19) Design a 2 bit counter using D Flip-Flop

20) Design a FSM to detect sequence "101" in input sequence.

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