Low Latency Ethernet 10G MAC Intel® FPGA IP User Guide

ID 683426
Date 4/09/2024
Document Table of Contents

4.10. IEEE 1588v2

The IEEE 1588v2 option provides time stamp for receive and transmit frames in the LL Ethernet 10G MAC IP core designs. The feature consists of Precision Time Protocol (PTP). PTP is a protocol that accurately synchronizes all real time-of-day clocks in a network to a master clock.

The IEEE 1588v2 option has the following features:

  • Supports 4 types of PTP clock on the transmit datapath:
    • Master and slave ordinary clock
    • Master and slave boundary clock
    • End-to-end (E2E) transparent clock
    • Peer-to-peer (P2P) transparent clock
  • Supports PTP with the following message types:
    • PTP event messages—Sync, Delay_Req, Pdelay_Req, and Pdelay_Resp.
    • PTP general messages—Follow_Up, Delay_Resp, Pdelay_Resp_Follow_Up, Announce, Management, and Signaling.
  • Supports simultaneous 1-step and 2-step clock synchronizations on the transmit datapath.
    • 1-step clock synchronization—The MAC function inserts accurate timestamp in Sync PTP message or updates the correction field with residence time.
    • 2-step clock synchronization—The MAC function provides accurate timestamp and the related fingerprint for all PTP message.
  • Supports the following IEEE 1588 accuracy:
    Table 19.  IEEE 1588 Supported Accuracy
    Speed Constant Time Error (Static Error) Dynamic Time Error (Random Error) Total Error
    10G ± 3ns ± 2ns ± 5 ns
    5G ± 3ns ± 2ns ± 5 ns
    2.5G ± 3ns ± 2ns ± 5 ns
    1G ± 3ns ± 2ns ± 5 ns
    100M ± 3ns ± 5 ns ± 8 ns
  • Supports IEEE 802.3, UDP/IPv4, and UDP/IPv6 protocol encapsulations for the PTP packets.
  • Supports untagged, VLAN tagged, and Stacked VLAN Tagged PTP packets, and any number of MPLS labels. The packet classifier under user control parses the packet (Ethernet packet or MPLS packet) and gives the IP core the required offset, at which either the time-of-day (TOD) or correction factor (CF) update can happen.
  • Supports configurable register for timestamp correction on both transmit and receive datapaths.
  • Supports TOD clock that provides streams of 64-bit and 96-bit timestamps. The 64-bit timestamp is for transparent clock devices and the 96-bit timestamp is for ordinary clock and boundary clock devices.