a testbench is a virtual circuit that is essentially a wrapper to the device under test, in principle without any physical I/O ports. It is used to generate and/or pass stimulus to the DUT (Device Under Test), accept response from the DUT, and check for correctness. In its simplest forms, you only have to pass some kind of proper stimulus and you will have to manually examine the outputs from the DUT, using e.g. a waveform viewer.
Hope this helps.
Best regards
Nikolaos Kavvadias
http://www.nkavvadias.com
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