Information

Enhanced Three-Speed Ethernet Controllers
MPC8308 PowerQUICC II Pro Processor Reference Manual, Rev. 1
Freescale Semiconductor 16-159
relative to the SFD detection. Thus, the offset from the [1558] specified sample point can be accounted for
in the PTP software implementation.
16.6.6.4 PTP Packet Parsing
PTP packets are typically embedded within a UDP payload with special IP source and destination address
and special source and destination ports numbers. Special fields of interest of a PTP packet are listed in
Table 16-144.
Table 16-144. PTP Payload Special Fields
Layer
Octet
(Offset from
the SFD)
Field Value
eTSEC filer
PID
Comments
Ethernet 12-13
Length/Packet
0x0800
ETY-RQPFR[P
ID=0111]
IPv4
IP header 22
Time to live
0x00
RBIFX- choose
an arbitrary
extraction byte
Must be 0
IP header 23
IP Protocol
0x11
L4P-RQPFR[P
ID=1011]
UDP
IP header 26-29
Source IP Address
IANA defines 4 multicast
address for the PTP packet
SIA-RQPFR[PI
D=1101]
IP header 30-33
Destination IP Address
IANA defines 4 multicast
address for the PTP packet
224.0.1.129
224.0.1.130
224.0.1.131
224.0.1.132
DIA-RQPFR[PI
D=1100]
DefaultPTPdomain
AlternatePTPdomain1
AlternatePTPdomain2
AlternatePTPdomain3
UDP
header
34-35
Source port number
SPT-RQPFR[P
ID=1011]
UDP
header
36-37
Destination port number
319
320
DPT-RQPFR[P
ID=1011]
EventPort
GeneralPort
UDP data 74
Control
0x0
0x1
0x2
0x3
0x4
RBIFX- choose
an arbitrary
extraction byte
Sync
Delay_req
Follow_up
Delay_resp
Management