The ingress logic does not parse the ingress packets to search for 1588
(PTP) frames. Instead, it takes a timestamp for every received frame and outputs this value
to the user logic. The feature is always enabled, but the timestamp output can be ignored if
you do not require this function. The timestamp can be extracted from the
rx_ptp_tstamp_out_<N> signal, where N corresponds to the bus
segment.
Timestamps are filtered after the PCS decoder to retain only those
timestamps corresponding to a start of packet (SOP). These timestamps output on the AXI4-Stream interface. The 55-bit timestamp is valid when the
first byte of the frame is present on the system interface.
Note:
rx_ptp_tstamp_out should be ignored for short packets.Figure 1. Timestamp Ingress Interface
