Static Class Properties and Methods

SV Verification Directory

Static Class Properties and Methods

Every object has its own local variables that are not shared with any other object. When two objects of Ex_class Class is created, each object with have its own class properties(variables). In certain instances, a specific variable is required to be shared by all objects of a certain type. Declaring a global variable will make the variable visible to the entire testbench. With the OOP, a static variable can be created inside a class. This variable is shared amongst all the instances of the class.

• A static keyword is used in a class member to denote a class that has static properties or static methods.
• The static variable declared inside a class with the static keyword shares a single memory location across all the class instances.
• The static variable implies that only one copy exists.
• Static methods are the same as static variables that follow class access rules and scope.
• Static functions and tasks cannot be virtual.
• Non-static class members can not be accessible from the static method. A static method should consist of only static variables.
• Non-static functions or tasks can access static variables.
• Both static methods and static members in a class can be accessed without creating an object.

Syntax: Static Variable

static {data_type} {variable_name};

Syntax:Static Method

static {task/function} {name}();

Difference between Static Function and Function Static

// static function example
static funtion void disp();
   // execute code
endfunction

//function static example
function static void disp();
   // execute code
endfunction