What is the difference between clocking block and Modport?

Clocking block is used to introduce input/output sampling/driving delays. Modport defines directions of signals and can be used to represent set of signals.

What is a Modport?

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.

What is clocking block?

A clocking block is a set of signals synchronised on a particular clock. It basically separates the time related details from the structural, functional and procedural elements of a testbench. It helps the designer develop testbenches in terms of transactions and cycles.

What is Modport in UVM?

Modport lists with directions are defined in an interface to impose certain restrictions on interface access within a module. The keyword modport indicates that the directions are declared as if inside the module.

Why Modport is used?

Modports are used to specify the direction of signal with respect to a specific module/component. They are also used to restrict access to certain signals from some modules/classes.

IT IS SURPRISING:  How do I put a stand on my Apple Watch?

How do clocking blocks avoid race conditions?

You can avoid race condition without using program block. Race condition is created just because of expression or assignments are try to access same signal at a same time. If two signals try to access same signal at different time stamp then user can remove race condition.

What are the different types of verification approaches in SV?

These approaches works in tandem & together makes a best possible solution.

  • Directed Verification.
  • Constrained Random Verification.
  • Coverage Driven Verification.
  • Assertion Based Verification.
  • Emulation Based Verification.

What is clocking block and what are the benefits of using clocking blocks inside an interface?

Use within an interface

Hence declaring a clocking block inside an interface can help save the amount of code required to connect to the testbench and may help save time during development. Signal directions inside a clocking block are with respect to the testbench and not the DUT.

What is input skew and output skew in clocking block?

Input and Output Skew

A skew number for an input denotes when that input is sampled before the clocking event (such as posedge or negedge) occurs. For an output, it is just the opposite – it denotes when an output is synchronized and sent after the clocking event.

What is the difference between the initial block and the final block?

What is the difference between initial block and final block? Initial block is getting executed at start of simulation while Final block is getting executed at end of simulation. You can schedule an event or have delay in initial block But you can’t schedule an event or have delay in final block.

IT IS SURPRISING:  How do I change my activity level on Apple Watch?

Why do you need a clocking block?

A clocking block is a set of signals synchronised on a particular clock. It basically separates the time related details from the structural, functional and procedural elements of a testbench. It helps the designer develop testbenches in terms of transactions and cycles.

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. You mean to say @(posedge) right?

What is UVM callback?

A callback in UVM is a mechanism for changing the behavior of a verification component (such as a driver or monitor) without actually changing the code of the component.

Is Modport synthesizable?

The usage of interfaces and modports shown in Fig,1 is synthesizable by at least two commercially available tools.

What is mailbox in SV?

A SystemVerilog mailbox is a way to allow different processes to exchange data between each other. It is similar to a real postbox where letters can be put into the box and a person can retrieve those letters later on.

What are the basic testbench components?

Components of a testbench

Component Description
Generator Generates different input stimulus to be driven to DUT
Interface Contains design signals that can be driven or monitored
Driver Drives the generated stimulus to the design
Monitor Monitor the design input-output ports to capture design activity