The FWC receives its stimulus from the GPWS as it relates to the annunciation. There is an RCD on the EGPWC for RAAS that can be enabled for V1 and Retard annunciations through the FWC. 

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“The RETARD mode is only available during automatic landing (AP engaged in LAND mode). At approximately 40 ft RA, the RETARD mode engages and remains engaged after touchdown. The A/THR commands IDLE thrust during the flare, and the FMA and engine warning display “IDLE”. If the autopilot is disengaged during the flare before touchdown, the SPEED mode replaces the RETARD mode, and the flight crew has to manually reduce thrust. Note: In an automatic landing, the system generates a “RETARD” callout at 10 ft RA, which prompts the flight crew to move the thrust levers to IDLE in order to confirm thrust reduction. In manual landing conditions, the system generates this callout at 20 ft RA, as a reminder.”

“The certified AIRBUS RCD enables only RAAS advisories triggered on ground. Therefore, RAAS advisories would unlikely interfere with other call-outs on ground. Indeed, call-outs triggered on ground in AIRBUS cockpits are: •  Predictive Wind Shear (PWS) alerts from Weather Radar (WXR), and WXR alerts have priority over EGPWS ones, •  V1 and RETARD call-outs, and the RAAS does not trigger advisories at the same aircraft speeds.”