Verilog HDL Interview Questions

Verilog HDL Interview Questions:

1. Why do we need an HDL?
2. Difference between Programming Language & Hardware Description Language
3. What are the different types of HDLs present in the industry?
4. Explain VHDL vs Verilog HDL
5. Different levels of Abstraction in Verilog
6. Explain the data types in Verilog
7. Difference between reg and wire & default values of reg and wire
8. Declare a 2-dimensional unpacked array
9. Difference between $display, $strobe, $write and $monitor
10. Difference between $finish, $stop and $reset
11. Write a Verilog code for NAND Gate using switch-level modelling
12. What are the different gate primitives in Verilog? Explain user-defined primitives
13. Explain the delays in Gate Level Modelling
14. What are the different types of operators in Verilog?
15. Difference between == and ===
16. Explain logical and arithmetic shifts with examples
17. Write a Verilog code for the decoder using conditional & shift operator
18. Explain the delays in Data Flow Modelling
19. What are procedural blocks in Verilog and explain them
20. Difference between the initial block and final block
21. Explain the difference between ‘begin-end’ and ‘fork-join’
22. Blocking vs Non-blocking assignments
23. Explain inter and intra-assignment delays with an example
24. Write a Verilog code RS NAND latch
25. Write a Verilog code D-flip flop in the behavioural model (async reset with active low)
26. Write a Verilog code for a 4-bit counter
27. What is a parameter?
28. Explain compiler directives
29. Explain `timescale in Verilog
30. Explain casex and casez statements
31. Explain the full case and parallel case statements
32. Difference between task and function
33. Explain the delays in Behavioural Modelling
34. Write a Verilog code for swapping two numbers (with & without the third variable)
35. Write a Verilog for 4:1 MUX in gate level, dataflow & behavioural modelling
36. Write the Verilog code for full adder using different styles
37. Write a Verilog code for full subtractor
38. Write a Verilog code for a 4 to 2 priority encoder using dataflow modelling
39. Write a Verilog code for the 011 sequence (both Mealy & Moore- overlap & non-overlap)
40. Write a Verilog code for the Mod-35 counter
41. Write a Verilog code for the frequency divider by 3
42. Write a Verilog code for a 4-bit up-down counter
43. Write a Verilog code for the 1MHz clock generator
44. Explain simulation & synthesis
45. What are the synthesizable constructs in Verilog?
46. What is linting?  
47. Explain Event regions in Verilog
48. What is structural modelling?
49. What is meant by a generic style of coding?
50. Explain port mapping in Verilog.