Freescale Semiconductor TWR-MCF52259-Ethenet - Manual (Page 20)

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The Ethernet Data Packet Format
Preamble
Destination
Address
Source
Address
Frame
Type
Frame
User Data
FCS
Checksum
8 Byte 6 Byte 6 Byte 2 Byte 46 – 1500 Byte 4 Byte 64-1518
Ethernet Data Frame – old/original format used
Preamble
Destination
Address
Source
Address
Length
Type
Frame
User Data
FCS
Checksum
7 Byte 1 Byte 2/6 Byte 2/6 Byte 2 Byte 46 – 1500 Byte 4 Byte
IEEE 802.3 Data Frame
SOF
DSAP SSAP Control Data
1 Byte 1 Byte ½ Byte