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6.2 EN311 Socket Interface Usage Notes
6
Figure 6-8 Packet Format/IP Datagram
Preamble (7 bytes)
Signal used to synchronize reception
SFD (Start Frame Delimiter) (1 byte)
Remote station address (6 bytes)
Local station address (6 bytes)
Ethernet type (2 bytes)
0800H:IP
､
0806H:ARP
IP header (20 bytes)
Packets
UDP header
(8 bytes)
flowing on the
transmission
line
(72 -
1526 bytes)
IP datagram
TCP header
(20 bytes)
(46 -
1500 bytes)
Data field of IP data field
The packet
(up to
flowing on the 1480 bytes)
UDP data field
(up to 1472 bytes)
TCP data field
(up to 1460 bytes)
transmission
line
FCS (Frame Check Sequence) (4 bytes)
32-bit CRC code for the sections of the packet other
than the preamble, the SFD, and the FCS.
(Packet error detection)
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