The PD Controller will always prepare its own Request message based on the settings in the AUTO_NEGOTIATE_SINK register (0x37) and the TX_SINK_CAPS register (0x33). The PD Controller will send its prepared Request message as soon as it is ready. The host can change the AUTO_NEGOTIATE_SINK register and/or the TX_SINK_CAPS register, then issue the 'GSrC' 4CC Task and the PD controller will re-negotiate the PD contract based on the updated values.