Datasheet

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Frame Segment Value
IP stuff (Octets 21–37) —
IP DA (Octets 38–53) FF0200000000006B
Source IP port (Octets 54–55) —
Dest IP port (Octets 56–57) 013F
Other stuff (Octets 58–61) —
Message type (Octet 62) 03
Other stuff (Octets 63–93) —
Version PTP (Octet 94) 02
For the multicast address 011B19000000 sync and delay request frames are recognized depending on the message
type field, 00 for sync and 01 for delay request.
T
able 38-12. Example of Sync Frame in 1588 Version 2 (Ethernet Multicast) Format
Frame Segment Value
Preamble/SFD 55555555555555D5
DA (Octets 0–5) 011B19000000
SA (Octets 6–11) —
Type (Octets 12–13) 88F7
Message type (Octet 14) 00
Version PTP (Octet 15) 02
Pdelay request frames need a special multicast address so they can pass through ports blocked by the spanning tree
protocol. For the multicast address 0180C200000E sync, Pdelay_Req and Pdelay_Resp frames are recognized
depending on the message type field, 00 for sync, 02 for pdelay request and 03 for pdelay response.
T
able 38-13. Example of Pdelay_Req Frame in 1588 Version 2 (Ethernet Multicast) Format
Frame Segment Value
Preamble/SFD 55555555555555D5
DA (Octets 0–5) 0180C200000E
SA (Octets 6–11) —
Type (Octets 12–13) 88F7
Message type (Octet 14) 00
Version PTP (Octet 15) 02
38.6.15 Time Stamp Unit
Overview
The TSU consists of a timer and registers to capture the time at which PTP event frames cross the message
timestamp point. An interrupt is issued when a capture register is updated.
The 1588 time stamp unit (TSU) is implemented as a 94-bit timer
.
SAM E70/S70/V70/V71 Family
GMAC - Ethernet MAC
© 2019 Microchip T
echnology Inc.
Datasheet
DS60001527D-page 596