LGCIU1 failure does NOT render Reverser 1 inop. First of all the FADEC is not involved in the reverser depolyment, only in the power setting of the engine. The On-Side EIU(Engine interface unit) recieves the revers signal from the Thrust potentiometer, it then checks for groung signal, first from onside LGCIU, if that is missing it uses Off side plus Radio alt and/or Wheel speed if all these conditions are fullfilled then it checks for Revers confirmation signal from SEC(spoiler elevator computer)then it sends a revers deploy signal to the HMU, when it recieves revers deployed more than 90% it lets the FADEC increase thrust.