LAN8670/1/2

4.12.1.1 PTP Message Format

PTP messages are transmitted in a standard Ethernet frame, which starts after the SFD with 6 bytes of Destination Address, and 6 bytes of source address. The next 2 bytes are the EtherType field, which indicates which protocol the payload represents. An EtherType field of 0x88F7 indicates that the packet is PTP over Ethernet. The next byte is fixed at 0x01 for PTP over Ethernet. The byte that follows is the PTP message type; the message types of interest are shown in Figure 4-8

Figure 4-8. Start of a PTP over Ethernet Frame

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