Thank you for the response!
The accumulator samples 1 symbol of data total at the ~1ns per sample rate with a reference defined by the RX_STAMP? Is it true that FLOOR(FP_INDEX) is always the same value (740?)? Is there any way to have the chip not perform the LDE and provide the accumulator samples relative to a different reference (non-LDE reference)?
As for the TX_STAMP, when does the counter start? relative to what reference? It doesn’t appear to be exactly related to the RX_STAMP … i.e. RX_STAMP + TX_RAWST + TX_ANTD isn’t the exact time the return transmit occurs. What additional delays are there?
What I need is a high accuracy and predictable time from one of the samples in the accumulator data to when the TX leaves the antenna that is not related to the internal LDE. For example, if the accumulator data was captured by a scope trace (simple threshold), the waveform on the scope would be captured centered around the captured threshold crossing… independent of what the waveform represents. Relative to this threshold crossing, I then need to know the precise time of the return transmit. The accumulator data in this case would act as a scope memory always capturing some known and fixed number of pre- and post- samples around the threshold crossing trigger point. As far as I can tell looking at the available documentation (primarily the DW User Manual), this cannot be done. Am I missing some key piece of information? What do you think?
Thanks again for your feedback.