Top Verilog interview Questions and answers

10 Verilog questions commonly asked in an interview (with example answers)
  • What is the difference between blocking and non-blocking? …
  • Explain Verilog full case and parallel case. …
  • What is the difference between a task and a function? …
  • What is PLI? …
  • What is the difference between == and ===?

Verilog VHDL Interview Questions Part 1

2: What is VHDL?

VHDL is short for Very High-speed Integrated Circuit HDL (Hardware Description Language). VHDL allows the user to describe and simulate a system before modeling it into a digital system.

This HDL has features that have made it very popular such as:

  • Readable
  • Tool availability. It is independent of technology and tool
  • Description of concurrent systems. Better efficient and less time consuming
  • Design data portability
  • Complexity management
  • Now moving on to the Verilog interview questions.

    We have collected 15 most asked Verilog interview questions along with their answers.

    These selected Verilog interview questions have answers that can additionally prepare you for topics that are related to the questions.

    There will always be Verilog interview questions that are not covered in this set of interview question answers, but these Verilog interview questions are sure to give you some idea on how to answer those.

    6:What are the main differences between Task and Function in Verilog?

    You will often come across Verilog Interview questions that require finding differences, and the key to answering such system Verilog questions is to be thorough and clear with the prominent differences.

    Before differentiating task and function let us understand what these are:

    Tasks are procedures where data is passed, processed and output is generated. The same thing can be said for functions but with a few differences that we will mention while answering this Verilog Interview question

    Task: It can enable a function as well as a task

    Function: Can only enable another function

    Task: Can be executed in both zero and non-zero simulation time

    Function: Execution is done with zero simulation time

    Task: Tasks are permitted to have delay statements, events, or statements controlling time

    Function: Cannot have any statements for delay or time control or events.

    Task: Invocation may or may not have arguments passed (input or output)

    Function: A minimum of one argument is required for invocation

    Task: No return value. Although can pass values through input/output statement

    Function: Returns single value but cannot use input/output statement

    5: What do you understand about Verilog full case statements and Verilog parallel case statements?

    Before preparing the answer to some of these Verilog interview questions, it’s better to have a clear perspective of the basic idea behind it.

    Let us understand what a case statement is in Verilog?

    This can be considered another one of the fundamental Verilog interview questions.

    Case statements in Verilog act as a decision-making statement such as the function of the if-else statement (commonly used in programming languages).

    Case statements are enclosed between “case” and “endcase”. In between are several case expressions, case items, and case item statements.

    The case item is used to compare with the case expression and in turn, execute the case item statement if the case item matches the case expression.

    Now let us understand and answer the main Verilog Interview question.

    An entire case statement refers to statements covering every possible match between case expression and case item or defaults. In other words, all possible binary patterns of case expressions should be matched with some case item or case default.

    A parallel case statement refers to case statements where one single match of case items can be found for a case expression. If any case expression finds a match with more than one case item, it will not be a parallel case statement. Instead, it will be overlapping.

    Also Read : Frontend Developer interview questions

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