Without quoting the FCOM? Sorry that would be difficult, maybe you meant not quoting the FCOM reference. This is what it does:
TURBULENCE DAMPING FUNCTION
This Topic is relevant to the following aircraft:
The purpose of the turbulence damping function is to damp the structural modes induced by atmosphere turbulence.
The function uses the Nz accelerometer and two dedicated Ny accelerometers. The PRIMs compute a turbulence damping command, which is added to the normal law command for the elevator and the yaw damper.
This function is automatically monitored and becomes inoperative for the remainder of the flight, when a failure is detected. In addition, it may be manually inhibited by switching off the TURB DAMP pushbutton on the overhead panel, when it is considered that comfort is degraded instead of being improved, and no failure is detected.
It is only available if the following conditions are met :
Aircraft in flight
Aircraft speed greater than 200 knots.
Autopilot engaged or normal law active.
Aircraft within the normal flight envelope.