IncludeHelp_logo
Skip Navigation Links
×

Multiple-Choice Questions

Web Technologies MCQs

Computer Science Subjects MCQs

Databases MCQs

Programming MCQs

Testing Software MCQs

Digital Marketing Subjects MCQs

Cloud Computing Softwares MCQs

AI/ML Subjects MCQs

Engineering Subjects MCQs

Office Related Programs MCQs

Management MCQs

More

Home » MCQs

VHDL Multiple-Choice Questions (MCQs)

VHDL stands for VHSIC Hardware Description Language, it is one of the commonly used Hardware Description Languages (HDL) in digital circuit design and is used for system design, modeling, and verification before synthesis into hardware.

VHDL MCQs: This section contains VHDL Multiple-Choice Questions with Answers. These MCQs are written for beginners as well as advanced, practice these MCQs to enhance and test the knowledge of VHDL.

List of VHDL MCQs

1. What is the full form of EDA in terms of VHDL?

  1. Electronic Design Automation
  2. Electrical Data Automation
  3. Electronic Data Auto-collection
  4. Electrical Design Adapter

Answer: A) Electronic Design Automation.

Explanation:

EDA stands for Electronic Design Automation.

Discuss this Question

2. The act of building a model or representation of a digital circuit or system in order to forecast its behaviour and evaluate its usefulness is known as ____.

  1. Implementation
  2. Simulation
  3. Verification
  4. Synthesis

Answer: B) Simulation

Explanation:

The act of building a model or representation of a digital circuit or system in order to forecast its behaviour and evaluate its usefulness is known as simulation.

Discuss this Question

3. The process of validating that a digital design satisfies its functional and performance criteria is referred to as ____.

  1. Implementation
  2. Simulation
  3. Verification
  4. Synthesis

Answer: C) Verification

Explanation:

The process of validating that a digital design satisfies its functional and performance criteria is referred to as verification.

Discuss this Question

4. The process of converting a high-level hardware description language (HDL) design, such as VHDL, into a lower-level representation, often a gate-level netlist, is known as ____.

  1. Implementation
  2. Simulation
  3. Verification
  4. Synthesis

Answer: D) Synthesis

Explanation:

The process of converting a high-level hardware description language (HDL) design, such as VHDL, into a lower-level representation, often a gate-level netlist, is known as synthesis.

Discuss this Question

5. Which of the following tools are used to create physical designs and deploy digital systems?

  1. Verification tools
  2. Place and route tools
  3. Time analysis tools
  4. Synthesis tools

Answer: B) Place and route tools

Explanation:

Place and route tools are used to create physical designs and deploy digital systems.

Discuss this Question

6. VHDL code is converted into a gate-level representation or netlist by which of the following tools?

  1. Verification tools
  2. Place and route tools
  3. Time analysis tools
  4. Synthesis tools

Answer: D) Synthesis tools

Explanation:

VHDL code is converted into a gate-level representation or netlist by synthesis tools.

Discuss this Question

7. Which of the following is not an example of a synthesis tool?

  1. Yosys
  2. Cadence Genus
  3. Prime time
  4. Xilinx Vivado HLS

Answer: C) Prime time

Explanation:

Prime Time is a popular static timing analysis tool.

Discuss this Question

8. Which of the following statement is True?

  1. A netlist file is a pictorial representation of the connectivity and logic of a digital circuit
  2. A netlist file is a written representation of the connectivity and logic of a digital circuit

Answer: B) A netlist file is a written representation of the connectivity and logic of a digital circuit.

Explanation:

A netlist file is a written representation of the connectivity and logic of a digital circuit.

Discuss this Question

9. Is there any visual or graphical information in a netlist file?

  1. Yes
  2. No

Answer: B) No

Explanation:

There is no visual or graphic information in a netlist file.

Discuss this Question

10. Does HDLs emphasize the concept of abstraction?

  1. Yes
  2. No

Answer: A) Yes

Explanation:

Both HDLs and OOP emphasize the idea of abstraction.

Discuss this Question

11. Does HDLs encourage modularity and reusability in design and development?

  1. Yes
  2. No

Answer: A) Yes

Explanation:

An HDL promotes modularity and reusability just as OOP does.

Discuss this Question

12. An HDL takes which of the following approaches?

  1. Structure and behavioral approach
  2. Object-oriented approach
  3. Master-servant approach

Answer: A) Structure and behavioral approach

Explanation:

HDL takes the structure and behavioral approach.

Discuss this Question

13. Verilog enables which modeling techniques?

  1. Structural modeling techniques
  2. Behavioural modeling techniques
  3. Both

Answer: C) Both

Explanation:

Verilog enables structural as well as behavioral modeling techniques.

Discuss this Question

14. Can the user specify data types in Verilog?

  1. Yes
  2. No

Answer: B) No

Explanation:

No, the user cannot specify data types in Verilog.

Discuss this Question

15. VHDL ____ represent a component's external behavior and interface.

  1. Port
  2. Architecture
  3. Signal
  4. Entity

Answer: D) Entity

Explanation:

VHDL entities represent a component's external behavior and interface.

Discuss this Question

16. Using VHDL ____, one can transfer data between components or inside them.

  1. Package
  2. Signal
  3. Port
  4. Component

Answer: B) Signal

Explanation:

Using VHDL signals, one can transfer data between components or inside them.

Discuss this Question

17. Port name in VHDL is ____.

  1. Case sensitive
  2. Case insensitive

Answer: B) Case insensitive

Explanation:

The port name is case insensitive.

Discuss this Question

18. Which of the following things is True, when it comes to writing up a port name?

  1. It always begins with a number
  2. It always begins with a symbol
  3. It always begins with a letter
  4. It always begins with a letter and symbol

Answer: C) It always begins with a letter.

Explanation:

The port number always begins with a letter.

Discuss this Question

19. In VHDL, a ____ is a grouping of related declarations such as data types, constants, and functions that may be shared and utilized across different design units.

  1. Components
  2. Testbench
  3. Concurrent statements
  4. Package

Answer: D) Package

Explanation:

In VHDL, a package is a grouping of related declarations such as data types, constants, and functions that may be shared and utilized across different design units.

Discuss this Question

20. Which of the following in VHDL specifies the internal implementation and behavior of a design component?

  1. Port
  2. Architecture
  3. Signal

Answer: B) Architecture

Explanation:

An architecture in VHDL specifies the internal implementation and behavior of a design component.

Discuss this Question

21. To specify parameters that can be supplied to VHDL entities, ____ are employed.

  1. Declarations
  2. Port numbers
  3. Packages
  4. Generics

Answer: D) Generics

Explanation:

To specify parameters that can be supplied to VHDL entities, generics are employed.

Discuss this Question

22. Which keyword is used to specify ports?

  1. Port_name
  2. Value_port
  3. Port
  4. Pt

Answer: C) Port

Explanation:

The port keyword is used to specify ports.

Discuss this Question

23. How many types of ports are there in VHDL?

  1. 5
  2. 4
  3. 3
  4. 2

Answer: B) 4

Explanation:

There are four types of ports in VHDL:

  • in
  • out
  • inout
  • buffer

Discuss this Question

24. An entity declaration begins with which of the following keyword?

  1. Start Entity
  2. Begin Entity
  3. Ent
  4. Entity

Answer: D) Entity

Explanation:

An entity declaration begins with the keyword entity.

Discuss this Question

25. The entity declaration is ended with which of the following keyword?

  1. Finish Entity
  2. Over
  3. End entity
  4. Close entity

Answer: C) End entity

Explanation:

The entity declaration is ended with the keyword 'end entity'.

Discuss this Question

26. Multi-bit digital values are represented using ____.

  1. Standard Logic Signals (std_logic)
  2. Standard Logic Vectors (std_logic_vector)
  3. Integer Signals
  4. Boolean Signals

Answer: B) Standard Logic Vectors (std_logic_vector)

Explanation:

Multi-bit digital values are represented using standard logic vectors.

Discuss this Question

27. Generics are declared in the ____ declaration part of a VHDL design.

  1. Port declaration
  2. Configuration
  3. Component
  4. Entity

Answer: D) Entity

Explanation:

Generics are declared in the entity declaration part of a VHDL design.

Discuss this Question

28. The ____ keyword in VHDL enables the creation of custom user-defined types.

  1. Custom
  2. Type
  3. Use
  4. User

Answer: B) Type

Explanation:

The type keyword in VHDL enables the creation of custom user-defined types.

Discuss this Question

29. An architecture declaration begins with the keyword ____.

  1. Archi
  2. Body
  3. Implementation
  4. Architecture

Answer: D) Architecture

Explanation:

An architecture declaration begins with the keyword architecture.

Discuss this Question

30. Which of the following statements defines the sequential behavior of an architecture?

  1. Concurrent signal assignment
  2. Case statement
  3. Process statements

Answer: C) Process statements

Explanation:

Process statements define the sequential behavior of an architecture.

Discuss this Question

31. Which of the following cannot be used as the name of the architecture in VHDL?

  1. Architecture
  2. Architecturee1
  3. Archii1
  4. Arch00

Answer: A) Architecture

Explanation:

We cannot use keywords as the name; therefore, we cannot use architecture as the name.

Discuss this Question

32. Which of the following VHDL object are utilized throughout processes to store temporary values?

  1. Constant
  2. Parameters
  3. Files
  4. Variables

Answer: D) Variables

Explanation:

Variables are utilized throughout processes to store temporary values.

Discuss this Question

33. What is the difference between parameters and constants?

  1. Parameters are similar to constants except that their values can be altered at instantiation
  2. Parameters are similar to constants except that their values cannot be altered at instantiation

Answer: A) Parameters are similar to constants except that their values can be altered at instantiation.

Explanation:

Parameters are similar to constants except that their values can be altered at instantiation or through generics.

Discuss this Question

34. Signals are assigned by using which of the following assignment operator?

  1. :=<
  2. :=
  3. <=:
  4. <=

Answer: D) <=

Explanation:

Signals are assigned by the assignment operator "<=".

Discuss this Question

35. How many types of Modelling styles are there in VHDL?

  1. 5
  2. 2
  3. 4
  4. 3

Answer: C) 4

Explanation:

Mainly there are four types of modeling styles on VHDL:

  • Structural Modelling
  • Behavioural Modelling
  • Dataflow Modelling
  • Mixed-Level Modelling

Discuss this Question

36. Which of the following modeling is concerned with expressing a design's functioning and behavior without explicitly stating its structure?

  1. Structural Modelling
  2. Behavioural Modelling
  3. Dataflow Modelling
  4. Mixed-Level Modelling

Answer: B) Behavioural Modelling

Explanation:

Behavioural modeling is concerned with expressing a design's functioning and behavior without explicitly stating its structure.

Discuss this Question

37. Which of the following operator(s) tests if operands are not equal?

  1. Not Equal
  2. !=
  3. /=
  4. ~=

Answer: C) /=

Explanation:

/= operator is used to test if operands are not equal.

Discuss this Question

38. A ____ type can combine elements of different data types to create a composite type.

  1. Array
  2. Record
  3. Files
  4. Variables

Answer: B) Record

Explanation:

A record type can combine elements of different data types to create a composite type.

Discuss this Question

39. Which of the following operator is used as a concatenation operator?

  1. ++
  2. $
  3. *
  4. &

Answer: D) &

Explanation:

& is known as a concatenation operator in VHDL.

Discuss this Question

40. Which of the following keyword is used to explicitly transform data from one type to another?

  1. Transform
  2. Change
  3. To
  4. Convert

Answer: C) To

Explanation:

The to keyword is used to explicitly transform data from one type to another.

Discuss this Question

41. Which of the following type of delays are used to simulate how digital circuits respond to changes in input signals?

  1. Transport delays
  2. Time delay
  3. Inertial delay
  4. Signal delay

Answer: C) Inertial delay

Explanation:

Inertial delays are used to simulate how digital circuits respond to changes in input signals.

Discuss this Question

42. In the VHDL code, inertial delays are commonly expressed with the ____ keyword.

  1. Before
  2. After
  3. Inertial
  4. Inertia
  5. Time

Answer: B) After

Explanation:

In VHDL code, inertial delays are commonly expressed with the after keyword.

Discuss this Question

43. ____ delays are employed in circuits to simulate the temporal behavior of continuous signals or occurrences.

  1. Transport delays
  2. Time delay
  3. Inertial delay
  4. Signal delay

Answer: A) Transport delays

Explanation:

Transport delays are employed in circuits to simulate the temporal behavior of continuous signals or occurrences.

Discuss this Question

44. In VHDL code, the ____ keyword is used to specify transport delays.

  1. Wait
  2. End
  3. Finish
  4. Delay

Answer: D) Delay

Explanation:

In the VHDL code, the delay keyword is used to specify transport delays.

Discuss this Question

45. Rise delay and fall delay are the types of which kind of delays?

  1. Inertial delay
  2. Transport delay

Answer: A) Inertial delay

Explanation:

Rise delay and fall delay come under inertial delay.

Discuss this Question

46. Multiple generics can be declared within an entity?

  1. True
  2. False

Answer: A) True

Explanation:

True, multiple generics can be declared within an entity.

Discuss this Question

47. In the entity instantiation statement, which of the following clause is used to associate generic names with the appropriate values?

  1. Port map
  2. Generic map
  3. Generic entity
  4. Entity map

Answer: B) Generic map

Explanation:

In the entity instantiation statement, the 'generic map' clause is used to associate generic names with the appropriate values.

Discuss this Question

48. Which of the following statement is used to aggregate a collection of concurrent or sequential statements into a single block?

  1. Block statement
  2. Concurrent statement

Answer: A) Block statement

Explanation:

The block statement is used to aggregate a collection of concurrent or sequential statements into a single block, hence establishing a hierarchical structure within the design.

Discuss this Question

49. In the block statement, Signals and variables specified outside the block can be directly accessed within the block?

  1. True
  2. False

Answer: B) False

Explanation:

Signals and variables specified outside the block cannot be directly accessed within the block.

Discuss this Question

50. Concurrent statement can directly interact with signals specified outside of their process or block scope?

  1. True
  2. False

Answer: A) True

Explanation:

Concurrent statements can directly interact with signals specified outside of their process or block scope.

Discuss this Question

51. The signal assignment statement is a ____ statement

  1. Concurrent
  2. Sequential
  3. Block

Answer: A) Concurrent

Explanation:

The signal assignment statement is concurrent.

Discuss this Question

52. ____ have a local scope and are only accessible within the process or block where they are defined.

  1. Signals
  2. Variables
  3. Both

Answer: B) Variables

Explanation:

Variables have a local scope and are only accessible within the process or block where they are defined.

Discuss this Question

53. The package body contains ____.

  1. The implementation details for the functions
  2. Procedures specified in the package
  3. Both
  4. None

Answer: C) Both

Explanation:

The package body contains the implementation details for the functions and procedures specified in the package.

Discuss this Question

54. Packages have which kind of scope?

  1. Local scope
  2. Global scope

Answer: B) Global scope

Explanation:

Packages have a global scope, which means they can be used and accessible from anywhere in the design.

Discuss this Question

55. Which of the following is the correct syntax for using an attribute in VHDL?

  1. Attribite.element.attribute_name
  2. Attribute-global-element.attribute_name
  3. Global_element.attribute_name
  4. element.attribute_name

Answer: D) element.attribute_name

Explanation:

The syntax for using an attribute is: element.attribute_name.

Discuss this Question

56. The public declarations and definitions that are available outside of the package are contained in the ____.

  1. Package body
  2. Package configuration
  3. Package declaration

Answer: C) Package declaration

Explanation:

The public declarations and definitions that are available outside of the package are contained in the package declaration.

Discuss this Question

57. Variables are assigned using which of the following?

  1. ::<
  2. =<
  3. <=
  4. :<

Answer: D) :<

Explanation:

Variables are assigned using variable assignment statements (:<) and are immediately updated inside the scope of the current scope.

Discuss this Question

58. An entity can have multiple architectures?

  1. True
  2. False

Answer: A) True

Explanation:

An entity can have multiple architectures.

Discuss this Question

59. In VHDL, function declarations, which of the following keyword specifies that the function has no side effects and depends only on the input arguments?

  1. Guarded
  2. Pure
  3. Impure
  4. Transport

Answer: B) Pure

Explanation:

In function declarations, Pure specifies that the function has no side effects and depends only on the input arguments.

Discuss this Question

60. Entities or packages from a specified library are imported for usage in the current design by utilizing which of the following keyword?

  1. Load
  2. Add
  3. Copied
  4. Use

Answer: D) Use

Explanation:

Entities or packages from a specified library are imported for usage in the current design by utilizing Use keyword.

Discuss this Question



Comments and Discussions!

Load comments ↻



Top MCQs
Top Programs/Examples
Top Tutorials
About
Student's Section
Subscribe

Copyright © 2024 www.includehelp.com. All rights reserved.