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CC2640R2F: About guard period and reference period when I/Q sampling

Part Number: CC2640R2F

I noticed there is different between document and code,

on the RLTS Toolbox document  it writes:




// First period is 4us guard time + 8us reference = 12us
HWREG(GPT0_BASE + GPT_O_TAV) = AOA_SIGNAL_DELAY_TIME + AOA_ANT_SWITCH_START_TIME;

But on the code (AoA.c) on SDK v2.4, it writes

// First period is 4us guard time + 8us settle + 4us first period = 16us

  HWREG(GPT0_BASE + GPT_O_TAV) = AOA_ANT_SWITCH_START_TIME + AOA_SIGNAL_DELAY_TIME;

Which one is correct?

And in the BT 5.1 spec, the guard period is 4us and reference guard is 8 us. Is TI follow the spec?