Freescale Semiconductor MPC8313E PowerQUICC II Pro Family Reference Manual page 899

Octet
Layer (Offset from
the SFD)
IP header 30-33
UDP
34-35
header
UDP
36-37
header
UDP data 74
A representation of the PTP packet is shown in
Preamble
15.6.6.4.1 General Purpose Filer Rule
The eTSEC receive filer has been enhanced with the addition of a general-purpose event bit. This event
bit can be used in conjunction with filing table rules to identify 1588 packets and indicate these packets by
setting special timer status register bits (TMR_STAT). Additionally, 1588 packets can be easily identified
by upper-layer software by using the filer to queue all PTP packets to one or more predefined virtual
queues. See Section 15.6.4.2.1, "Filing Rules,"
15.6.6.5 Timestamp Insertion on Transmit Packets
Software has the option to write the timestamp of the transmitted frame to memory in the padding
alignment bytes (PAL) located between the TxFCB and the frame data. It is required that a minimum of
two TxBDs are used. The first points to the start of the 8-byte TxFCB. The second points to the start of
frame data. In memory, the TxFCB, and at least the first 16 bytes of the TxPAL must be adjacent, i.e.,
located in continguous memory locations, as depicted in
MPC8313E PowerQUICC™ II Pro Integrated Processor Family Reference Manual, Rev. 2
Freescale Semiconductor
Table 15-160. PTP Payload Special Fields (continued)
Field
Destination IP Address
IANA defines 4 multicast
address for the PTP packet
Source port number
Destination port number
Control
SFD SRC DEST
10101011
Timestamp Point
Figure 15-141. PTP Packet Format
eTSEC filer
Value
224.0.1.129
224.0.1.130 DIA-RQPFR[PI
224.0.1.131
224.0.1.132
SPT-RQPFR[P
319 DPT-RQPFR[P
320
0x0
0x1 RBIFX- choose
0x2
0x3 extraction byte
0x4
Figure 15-141.
L/T
IP_H UDP_H
for further information.
Figure 15-142.
Enhanced Three-Speed Ethernet Controllers
Comments
PID
DefaultPTPdomain
AlternatePTPdomain1
D=1100] AlternatePTPdomain2
AlternatePTPdomain3
ID=1011]
EventPort
ID=1011] GeneralPort
Sync
Delay_req
an arbitrary Follow_up
Delay_resp
Management
Data CRC
PTP_Message
15-181