Hello Riccardo,
Due to the speed that this may require I'm not sure that a Kinetis MCU is the best option. If you want to use the Kinetis you will need something to deal with the reception of the data, like an FPGA.
Probably the best option is a processor of the i.MX family which are way much faster than the Kinetis MCUs.
Unfortunately, we don't have examples of a USB sniffer for any of the families mentioned before.
Hope it helps!
Victor.
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