This class stimulates the DUT with

Transaction objects. OOP rules sayTransaction), it can also point toBadTr). This is because the handle tr can onlysrc, dst, crc, and data, and the routine calc_crc.BadTr objects into the driver without changing it.tr.calc_crc, SystemVerilog looks at the type oftr, because the task was declared as virtual. If the object is ofTransaction, SystemVerilog calls Transaction::calc_crc. If it is of type BadTr::calc_crc

that if you have a handle of the base type (

an object of an extended type (

reference the variables

So you can send

When the driver calls

object stored in

type

BadTr, SystemVerilog calls