Airbus FBW have a boxed "REV" indication that appears on the respective N1 or EPR gauge - amber while reverser is travelling, green when in correct position.
The FADEC will command idle thrust in the event of one or more reverser doors unlocked in flight or not in commanded position, and/or will command auto restow.
You might also get a ENG 1(2) at IDLE message and ENG 1(2) SHUTDOWN command on ECAM. It tells you to set thrust to idle and engine master off, along with speed limit, max rudder trim, and LAND ASAP amber.
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Last edited by Uplinker; 4th Sep 2017 at 14:27.