Freescale Semiconductor MPC8313E PowerQUICC II Pro Family Reference Manual page 880

Enhanced Three-Speed Ethernet Controllers
The user instructs the Tx packet to be timestamped via setting bit 15 in the TxFCB to mark a PTP packet.
TxFCB[VLCTL] can be translated as the Tx PTP packet identification number. BD[TOE] has to be set to
enable transmit PTP packet timestamping. TxFCB[PTP] bit takes precedence over TxFCB[VLN] bit. It
disables per packet VLAN tag insertion. On a PTP packet, VLAN tag can be inserted from the DFVLAN
register. A proposed TxFCB update for the PTP packet is shown in
The contents of the Tx FCB are defined in
Bytes Bits Name
0–1 0 VLN
1 IP
2 IP6
3 TUP
4 UDP
0–1 5 CIP
6 CTU
7 NPH
8–14 —
15 PTP
MPC8313E PowerQUICC™ II Pro Integrated Processor Family Reference Manual, Rev. 2
15-162
Table 15-152.
Table 15-152. Tx Frame Control Block Description
VLAN control word valid. This bit is ignored when the PTP bit is set. VLAN tag is read from
the DFVLAN register if PTP=1.
0 Ignore VLCTL field.
1 If VLAN tag insertion is enabled for eTSEC, use the VLCTL field as the VLAN control
word.
Layer 3 header is an IP header.
0 Ignore layer 3 and higher headers.
1 Assume that the layer 3 header is an IPv4 or IPv6 header, and take L3OS field as valid.
IP header is IP version 6. Valid only if IP = 1.
0 IP header version is 4.
1 IP header version is 6.
Layer 4 header is a TCP or UDP header.
0 Do not process any layer 4 header.
1 Assume that the layer 4 header is either TCP or UDP (see UDP bit), and offload
checksumming on the basis that the IP header has no extension headers.
UDP protocol at layer 4.
0 Layer 4 protocol is either TCP (if TUP = 1) or undefined.
1 Layer 4 protocol is UDP if TUP = 1.
Checksum IP header enable.
0 Do not generate an IP header checksum.
1 Generate an IPv4 header checksum.
Checksum TCP or UDP header enable.
0 Do not generate a TCP or UDP header checksum. RFC 768 advises that UDP packets
not requiring checksum validation should have their checksum field set to zero.
1 Generate a TCP header checksum if IP = 1 and TUP = 1 and UDP = 0.
Disable calculation of TCP or UDP pseudo-header checksum. This bit should be set if IP
options need to be consulted in forming the pseudo-header checksum, as eTSEC does not
examine IP options or extension headers for TCP/IP offload on transmit.
0 Calculate TCP or UDP pseudo-header checksum as normal, assuming that the IP header
has no options.
1 Do not calculate a TCP or UDP pseudo-header checksum, but instead use the value in
field PHCS when determining the overall TCP or UDP checksum.
Reserved
Indication to the transmitter that this is a PTP packet. Enabling PTP disables per packet
VLAN tag insertion. Instead, VLAN tag will be read from the DFVLAN when the PTP field is
true.
0 Do not attempt to capture transmission event time
1 Valid PTP_ID field. When this packet is transmitted, capture the time of transmission.
Must be clear if TMR_CTRL[TE] is clear.
Figure 15-143.
Description
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