Received Timestamp Ports (Out-of-Band) - 7.2 English

Received Timestamp Ports (Out-of-Band) - 7.2 English - PG138

AXI 1G/2.5G Ethernet Subsystem Product Guide (PG138)

Document ID

PG138

Release Date

2024-06-05

Version

7.2 English

The captured timestamp will always be presented out-of-band with TEMAC frame reception using a dedicated AXI4-Stream interface. The signal definition for this is defined in the following table.

A timing diagram showing the operation of this interface follows the table. To summarize, the timestamp will be valid on the same clock cycle as the first data word of frame data. This AXI4-Stream interface is synchronous to the TEMAC receive clock.

Table 1. AXI4-Steam Interface Ports – Receive Timestamp
Name	Direction	Description
rx_ts_axis_tdata[127:0]	Out	AXI4-Stream Receive Timestamp from the TEMAC. Bits[127:80] - Reserved Bits [79:32] - Captured Timestamp Seconds field Bits [31:0] - Captured Timestamp Nano-seconds field
rx_ts_axis_tvalid	Out	AXI4-Stream Receive Timestamp Data Valid from the MAC

Figure 1. AXI4-Stream Interface Timing – Receive Timestamp