The same applies to the A320
per the FCOM - ACTUATION LOGIC
Deployment requires :
‐ One FADEC channel, operating with its associated throttle reverse signal ;
‐ Right and left main gear compressed signal from the corresponding LGCIUs ;
‐ A Thrust Lever Angle (TLA) reverse signals from at least one Spoiler Elevator Computer (SEC).
Before deployment is completed, the FADEC sets reverse idle thrust on the engine that is having its
thrust reversed.is