Quick Answer: What Is Virtual Class In SystemVerilog?

What is the mean of virtual?

Something that is virtual can be done or seen using a computer and therefore without going anywhere or talking to anyone: virtual shopping.

Computer concepts..

What is Modport SystemVerilog?

Modports in SystemVerilog are used to restrict interface access within a interface. The keyword modport indicates that the directions are declared as if inside the module. Modports can have. input : Ports that need to be input. output : Ports that need to be output.

What is virtual in SystemVerilog?

In SystemVerilog this is called an abstract class and is declared by using the word virtual: … Methods, too, may be declared virtual. This means that if the method is overridden in a derived class, the signature (the return type, the number and types of its arguments) must be the same as that of the virtual method.

What is the use of virtual keyword in SystemVerilog?

A method with virtual keyword In the below example, the method inside the base class is declared with a virtual keyword, on calling method of the base class which is pointing to an extended class will call the extended class method.

What is polymorphism in SV?

Polymorphism in SystemVerilog Polymorphism means many forms. Polymorphism in SystemVerilog provides an ability to an object to take on many forms. Method handle of super-class can be made to refer to the subclass method, this allows polymorphism or different forms of the same method.

What is virtual base class explain with example?

Virtual base classes, used in virtual inheritance, is a way of preventing multiple “instances” of a given class appearing in an inheritance hierarchy when using multiple inheritance. … When you specify virtual when inheriting your classes, you’re telling the compiler that you only want a single instance.

What is config DB in UVM?

UVM Config db. The configuration database provides access to a centralized database, where type specific information can be stored and received. config_db can contain scalar objects, class handles, queues, lists, or even virtual interfaces.

Can a class be virtual?

In object-oriented programming, a virtual class is a nested inner class whose functions and member variables can be overridden and redefined by subclasses of an outer class. Virtual classes are analogous to virtual functions.

What is inheritance and polymorphism?

Inheritance is creating a class that derives its feature from an already existing class. On the other hand, polymorphism is an interface that can be defined in multiple forms. Inheritance is implemented on the classes whereas, the polymorphism is implemented on methods/functions.

What is inheritance in SV?

SystemVerilog Inheritance. Inheritance is an OOP concept that allows the user to create classes that are built upon existing classes. The new class will be with new properties and methods along with having access to all the properties and methods of the original class.

Why do we need virtual interface?

Virtual interfaces provide a mechanism for separating abstract models and test programs from the actual signals that make up the design. A virtual interface allows the same subprogram to operate on different portions of a design and to dynamically control the set of signals associated with the subprogram.

What is a virtual class in Java?

In object-oriented programming, a virtual class is a nested inner class whose functions and member variables can be overridden and redefined by subclasses of an outer class. Virtual classes are analogous to virtual functions.

What is virtual interface in UVM?

In UVM, for this, we utilize the newly introduced SystemVerilog feature called “Virtual Interface”. An “Interface” is a collection of common signals between two entities & the signal direction is governed by the “modports”. We can see virtual interface as a handle pointing to the interface instance.

What is difference between virtual and static class?

A static member is something that does not relate to any instance, only to the class. A virtual member is something that does not relate directly to any class, only to an instance. So a static virtual member would be something that does not relate to any instance or any class.

What is $cast in SystemVerilog?

SystemVerilog provides the $cast system task to assign values to variables that might not ordinarily be valid because of differing data type. $cast can be called as either a task or a function. … The dest_var is the variable to which the assignment is made.

What is static variable in SystemVerilog?

Static Variables. When a variable inside a class is declared as static , that variable will be the only copy in all class instances. … On the other hand, the normal counter variable ctr is not declared as static and hence every class object will have its own copy.

What is this keyword in the SystemVerilog?

SystemVerilog ‘this’ keyword. The this keyword is used to refer to class properties, parameters and methods of the current instance. … this is basically a pre-defined object handle that refers to the object that was used to invoke the method in which this is used.

What is a virtual variable?

A virtual variable is created by applying an operator (a mathematical algorithm) to one or more input acoustic variables (operands). Operands may be raw variables or other virtual variables.

How do virtual classes work?

A virtual classroom is an online learning environment that allows for live interaction between the tutor and the learners as they are participating in learning activities. In other words, the virtual classroom is a shared online space where the learners and the tutor work together simultaneously.

What is the use of virtual class?

In object-oriented programming, a virtual class is a nested inner class whose functions and member variables can be overridden and redefined by subclasses of an outer class. Virtual classes are analogous to virtual functions.