Ingress - 1.2 English

USXGMII Ethernet Subsystem Product Guide (PG251)

Document ID
PG251
Release Date
2023-12-12
Version
1.2 English

The ingress logic does not parse the ingress packets to search for 1588 precise timing protocol (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.

Timestamps are filtered after the PCS decoder to retain only those timestamps corresponding to a Start of Packet (SOP). These 80-bit timestamps are output on the system side. The timestamp is valid during the S0P cycle and when ena_out = 1.

Figure 1. Ingress