16-bit High-Performance Single-Chip 10/100 Ethernet Controller with HP Auto-MDIX
Datasheet
Data Written to the
Ethernet Controller
31
0
TX Command 'A'
Buffer End Alignment = 1
Data Start Offset = 7
TXCommand'A'
TXCommand'B'
Data Passed to the
TX Data FIFO
First Segment = 1
Last Segment = 0
Buffer Size = 79
7-Byte Data StartOffset
TXCommand'A'
TXCommand'B'
TX Command 'B'
Packet Length = 111
79-BytePayload
Pad DWORD 1
79-BytePayload
10-Byte
EndPadding
TXCommand'A'
15-BytePayload
31
0
TX Command 'A'
Buffer End Alignment = 1
Data Start Offset = 0
First Segment = 0
Last Segment = 0
Buffer Size = 15
TXCommand'A'
TXCommand'B'
TXCommand'A'
17-BytePayload
15-BytePayload
TX Command 'B'
Packet Length = 111
1B
31
0
10-Byte
EndOffsetPadding
TX Command 'A'
TXCommand'A'
Buffer End Alignment = 1
Data Start Offset = 10
TXCommand'B'
First Segment = 0
Last Segment = 1
Buffer Size = 17
10-Byte
Data StartOffset
NOTE: Extra bytes
betw een buffers are
not transmitted
TX Command 'B'
Packet Length = 111
17-BytePayloadData
5-ByteEndPadding
Figure 3.14 TX Example 1
Revision 1.5 (07-18-06)
SMSC LAN9217
DATA5S2HEET
SMSC [ SMSC CORPORATION ]
