systemverilog assertions interview questions

Out of all the means of landing a job, performing well in an interview is the surest. Employers usually invite potential employees to interviews to gauge their ability and expertise before serving in different positions.

In this article, we take a look at some of the most common questions in system Verilog interviews. System Verilog is a technical term encompassing hardware description and verification language. It is used in the chip industry and calls for experts.

Systemverilog Assertions Examples : Real-time simulation

before the clock, OR in terms of time step as in case 1) above, where the step corresponds to global time precision (defined using `timescale directive)

For Example: Refer to the constraint c_a_b_const in the following code. In the base class, it is defined to always have a value of a< b, but in a derived class, it has been overridden to have always a > b.

2) Without using unique constraint, you can still generate incremental values and then do an array shuffle() in post_randomize() ;

In the above example of using a “case” statement, the expression match happens exactly with what is specified. For example, in above case statement, if at least one of the select lines is X or Z, then it will not match any conditions and will execute the default statement.

The new[] operator is used to allocate memory for a dynamic array. The size of the dynamic array that needs to be created is passed as an argument to the new[].

What is the difference between code coverage & functional coverage?

Code coverage measures how much of the code has been executed (statement, branch, expressions in the RTL code).

What is virtual class in SystemVerilog?

A virtual class is a class for which instance or object cannot be constructed but you can define the handle to the virtual class. They are used to create code that can be shared across multiple projects

Pure virtual methods can be defined as templates in the virtual class. Basically it forces all extended classes to implement the functions.

Mention the Difference Between a Virtual and Pure Virtual Function in System Verilog

A virtual function allows the overriding of implementation of a function in a given derived class. Therefore, the base class doesn’t need to implement the virtual function. 0n the other hand, a pure virtual function only has the declaration and lacks any implementation. Therefore, any derivative class must implement the function. Why Should We Hire You? 5 Best Answ…

FAQ

What are assertions in SystemVerilog?

SystemVerilog Assertions (SVA) form an important subset of SystemVerilog, and as such may be introduced into existing Verilog and VHDL design flows. Assertions are primarily used to validate the behavior of a design.

Can we write SystemVerilog assertions in class?

Assertions can also access static variables defined in classes; however, access to dynamic or rand variables is illegal. Concurrent assertions are illegal within classes, but can only be written in modules, SystemVerilog interfaces, and SystemVerilog checkers2.

What is the difference between a $Rose and Posedge )?

When you say $rose(a), it gives 1 or 0. Moreover $rose is set to one if the least significant bit of a changes from any value(0,x,z) to 1 else it is set to 0. 2) @posedge is an event.It is checked instantly.It does not return any value.

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