RX_TTCKO update after frame demodulation

Dear all,

According to the DW1000 user manual, page 100: “The RX_TTCKO register contains the following sub-fields which are updated when a frame demodulation is completed successfully”.
I would like to ask why does the transceiver need to wait until a successful frame demodulation to update this register and if there is any way to bypass it, i.e., update this register (or at least the RCPHASE) BEFORE completing the frame demodulation.