4.1.9. 1588 Precision Time Protocol Interfaces
If you turn on Enable IEEE 1588 , the 25G Ethernet Intel FPGA IP core processes and provides 1588 Precision Time Protocol (PTP) timestamp information as defined in the IEEE 1588-2008 Precision Clock Synchronization Protocol for Networked Measurement and Control Systems Standard. This feature supports PHY operating speed with a constant timestamp accuracy of ± 4 ns and a dynamic timestamp accuracy of ± 1 ns.
1588 PTP packets carry timestamp information. The 25G Ethernet Intel FPGA IP core updates the incoming timestamp information in a 1588 PTP packet to transmit a correct updated timestamp with the data it transmits on the Ethernet link, using a one-step or two-step clock.
A fingerprint can accompany a 1588 PTP packet. You can use this information for client identification and other client uses. If provided fingerprint information, the IP core passes it through unchanged.
The IP core connects to a time-of-day (TOD) module that continuously provides the current time of day based on the input clock frequency. Because the module is outside the 25G Ethernet Intel FPGA IP core, you can use the same module to provide the current time of day for multiple modules in your system.
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