at the stage it is maintaining vprot, it will do so by pushing nose down. This function is commanded by whichever computer is controlling the elevators and THS (Normally ELAC2 but redundency provided by ELAC1, SEC2, SEC1). As soon as there is enough thrust to exceed V.prot, it will maintain 1G as it is still in normal law... where zero sidestick commands 1G. this means if you get A.floor and leave the stick alone, you will accelerate (Rapidly) while maintaining 1G (and a level or slightly nose down attitude i imagine)
the FAC (there are 2 of them) monitors angle of attack and simply sends the message for TOGA... not sure if it sends it directly to the FADECs or through some intermediary...
If you maintain full back stick with A.floor, the plane will use pitch (Commanded by ELAC2) to keep V.a.max, pulling the nose up just as much as it can without letting the speed drop below V.a.max. The plane then climbs like a homesick angel.
The thrust is commanded to TOGA by the A.floor function of the FACs... when you are no longer in A.floor, this changes to TOGA LOCK... the only difference between the two is that you can get out of TOGA LOCK by pushing the instinctive disconnect, then take back manual control of the thrust, and re engage autothrust if you so desire In A.FLOOR you cannot get out of TOGA until the conditions (AoA) are no longer met for A.floor.
complicated i know....