I have a question with regards to the CW305 Artix board and the tutorial NAEAN0010: Power Analysis on FPGA Implementation of AES Using CW305 & ChipWhisperer. On Section 5.2 Capturing Traces we use the function target.usb_trigger_toggle() for starting an encryption process.
When capturing traces, I obtain a pattern as the one shown below. The red trace at the bottom is the trigger and the blue trace is the power trace. During the triggering, we see 12 regions which (could) correspond to the AES rounds (?). Is my interpretation correct? Does this mean that the trigger signal goes down when the encryption process is finished?
If my interpretation is correct, why do we see 12 regions in the power trace? Aren’t we running an AES-128 which requires 10 rounds?