SLAU723A October 2017 – October 2018 MSP432E401Y , MSP432E411Y
The MAC captures a timestamp when the Start Frame Delimiter (SFD) of a frame is sent. The transmit frames are marked to indicate whether a timestamp should be captured for that frame and written to the extended transmit descriptors that support timestamping. The MAC returns the timestamp automatically to the corresponding transmit descriptor, thus connecting the timestamp with the specific PTP frame. The 64-bit timestamp information is written to the TDES6 and TDES7 fields.