I saw this failure , Fadec A+B fault when I was positioning a while back .
First I heard a loud banging from the engine and the Captain called me into the F/D to give my thoughts .
ECAM keep pinging Fadec A , Fadec B , Fadec A+B ...it was abit confused .
All parameters for the engine were spurious but thrust symmetric and constant as confirmed by Flight controls page , and responded normally to TL's .