Ieee 1588v2 receive datapath, Ieee 1588v2 frame format, Ieee 1588v2 receive datapath -38 – Altera Triple Speed Ethernet MegaCore Function User Manual
Page 74: Ieee 1588v2 frame format -38
Table 4-12: Timestamp and Correction Insertion for 1-Step Clock Synchronization
This table summarizes the timestamp and correction field insertions for various PTP messages in different PTP
clocks.
P2P Transparent Clock
E2E Transparent Clock
Boundary Clock
Ordinary Clock
PTP Message
Insert
Correction
Insert
Timestamp
Insert
Correction
Insert
Timestamp
Insert
Correction
Insert
Timestamp
Insert
Correction
Insert
Timestamp
No
Yes
No
No
Yes
No
Sync
No
Yes
No
No
No
No
No
Delay_Req
No
No
Yes
No
No
No
No
No
Pdelay_Req
,
No
Yes
No
Yes
No
Yes
No
Pdelay_Resp
No
No
No
No
No
No
No
No
Delay_Resp
No
No
No
No
No
No
No
No
Follow_Up
No
No
No
No
No
No
No
No
Pdelay_Resp_
Follow_Up
No
No
No
No
No
No
No
No
Announce
No
No
No
No
No
No
No
No
Signaling
No
No
No
No
No
No
No
No
Management
Notes to
:
1. Applicable only when 2-step flag in
flagField
of the PTP frame is 0.
2. Applicable when you assert
tx_ingress_timestamp_valid
.
IEEE 1588v2 Receive Datapath
In the receive datapath, the IEEE 1588v2 feature provides a timestamp for all receive frames. The timestamp
is aligned with the
avalon_st_rx_startofpacket
signal.
IEEE 1588v2 Frame Format
The MAC function, with the IEEE 1588v2 feature, supports PTP frame transfer for the following transport
protocols:
• IEEE 802.3
• UDP/IPv4
• UDP/IPv6
Functional Description
Altera Corporation
UG-01008
IEEE 1588v2 Receive Datapath
4-38
2014.06.30