I am working on a project and I would like to add a WI-FI module. As this is the first time that I design a circuit with a wifi module I'm trying to understand the duet wifi module sch. Could someone explain me where can I find information about this design or maybe could try to explain me the value of the terminators resistors in the wifi module and the use of the flip-flop for the NPCS0 and GPIO4 signals.