Altera Triple Speed Ethernet MegaCore Function - Manual (Page 75)

PTP Frame in IEEE 802.3
Figure 4-27: PTP Frame in IEEE 8002.3
flagField
correctionField
transportSpecific | messageType
reserved | versionPTP
reserved
1 Octet
1 Octet
1 Octet
2 Octets
8 Octets
reserved 4 Octets
SourcePortIdentify 10 Octets
sequenceId 2 Octets
controlField 1 Octet
logMessageInterval 1 Octet
TimeStamp 10 Octets
domainNumber
messageLength 2 Octets
1 Octet
Length/Type = 0x88F7
Source Address
Destination Address
2 Octets
6 Octets
6 Octets
MAC Header
PTP Header
0..1500/9600 Octets
CRC
Payload
4 Octets
(1)
Note to Figure 4–27 :
1. For frames with VLAN or Stacked VLAN tag, add 4 or 8 octets offsets before the length/type field.
PTP Frame over UDP/IPv4
Checksum calculation is optional for the UDP/IPv4 protocol. The 1588v2 Tx logic should set the checksum
to zero.
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4-39 PTP Frame in IEEE 802.3
UG-01008
2014.06.30