Under what conditions does the FWC give the PITCH PITCH aural call-out on the A320? I wanted to find more detailed information about the PITCH PITCH aural call-out that the FWC gives out on the A320. However it is not listed in the FCOM. It would help alot to understand about this feature.

It would be really helpful for an official reference also.
The "PITCH, PITCH" synthetic voice is called out when 


  "The aircraft pitch attitude is becoming excessive during flare an
  landing."


This is an optional feature which airlines can install to avoid tail strike.

Source: ECAM Description, Indicating/Recording Systems, Aircraft Systems, A320 FCOM