Verilog Interview Questions
Free Interview Questions & Answers
What is Verilog?
Verilog is a hardware description language (HDL) that is used to model the digital components, and analog components used in any embedded product. It is most commonly used in the design and verification of digital circuits at the register-transfer level of abstraction. Verilog HDL has different derivatives as explained below:
- Verilog -2005 is used for digital circuit modelling.
- Verilog –Is used for modelling analog components.
- Verilog-AMS is used for Analog & Mixed signal systems. This HDL has both synthesizable and non-synthesizable subsets.
Why is Verilog important?
Verilog- HDL has support for concurrency, timing, structure, and procedures. Hence it’s a perfect language to design a register-transfer level of abstraction. It is based on IEEE-1364-2005 hence its syntax and semantics follow standards that are accepted by all types of designs.
How to prepare for the Verilog Interviews?
The trainee who wants to clear Verilog interviews needs to have the following skill sets: Verilog HDL trained in RTL & [Test bench](https://www.maven-silicon.com/blog/systemverilog-testbench-verification-environ
What is expected from the Verilog Interviews?
The interviewer checks your RTL coding skills, Simulation debugging skills.
They also expect you to write synthesizable code and be aware of the design implementation process i.e. from RTL design to Netlist for front-end design and from RT
the initial process in Verilog HDL is the synthesizable
- initial process in Verilog HDL executes multiple times
- initial process in Verilog HDL starts at posedge of the clock
- initial process in Verilog HDL starts at 0 simulation time and executes only once.
Answer - 4. initial process in Verilog HDL starts at 0 simulation time and executes only once.
Answer - We have used here the reversed part-select index expression ordering.
- Parameters are local variables
- Parameters are global constants
- Parameters are local constants that can be over-ridden during the elaboration phase
- Parameters can’t be changed
Answer - 3. Parameters are local constants that can be over-ridden during the elaboration phase
Answer - The value of out is 3’b111
wire #10 a = b & c;
Answer - A. It is a net declaration of the net ‘a’. Change to ‘b’ or ‘c’ stable for at least 10ns triggers the recomputation of ‘a’, 10-time units later.
Answer - 55ns
Answer - An event is a change in a register or net type. Pos-edge or neg-edge triggered events are used to infer flip-flops.
Answer - Testbench is a behavioral model that doesn’t have a port list. It is used for driving stimulus to the DUT with an intentio0n of verifying the functionality of the design.
Answer - The timescale directive is used for customizing the time unit and time precision.
Conclusion
The Verilog HDL domain has tremendous scope for growth around the globe. You can learn and master Verilog concepts and bag the VLSI job opportunities in the fast growing semiconductor industry.
To correctly align your VLSI career aims, It is necessary to learn Verilog HDL and be an expert in RTL design. Practising these Verilog Interview questions and answers will help you crack the Verilog job opportunities.
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