Block Level Testbench
As an example of a block level testbench, consider a testbench built to verify a SPI Master DUT.
In this case, the UVM environment has two agents - an APB agent to handle bus transfers on its APB slave port, and a SPI agent to handle SPI protocol transfers on its SPI port. The structure of the overall UVM verification environment is illustrated in the block diagram. Let us go through each layer of the testbench and describe how it is put together from the top down.
