lan9218 Standard Microsystems Corp., lan9218 Datasheet - Page 49

• Manufacturer Part Number: lan9218
• Description: Lan9218 High-performance Single-chip 10/100 Ethernet Controller With Hp Auto-mdix Support
• Manufacturer: Standard Microsystems Corp.

High-Performance Single-Chip 10/100 Ethernet Controller with HP Auto-MDIX Support
Datasheet
SMSC LAN9218
Figure 3.13, "TX Example 1"
how data is passed to the TX data FIFO.
TX Com m and 'A'
Buffer End Alignment = 1
Data Start Offset = 7
First Segment = 1
Last Segment = 0
Buffer Size = 79
TX Com m and 'B'
Packet Length = 111
TX Com m and 'A'
Buffer End Alignment = 1
Data Start Offset = 0
First Segment = 0
Last Segment = 0
Buffer Size = 15
TX Com m and 'B'
Packet Length = 111
TX Com m and 'A'
Buffer End Alignment = 1
Data Start Offset = 10
First Segment = 0
Last Segment = 1
Buffer Size = 17
TX Com m and 'B'
Packet Length = 111
31
31
31
Ethernet Controller
Data Written to the
7-Byte Data Start Offset
17-Byte Payload Data
5-Byte End Padding
End Offset Padding
Data Start Offset
TX Command 'A'
TX Command 'B'
TX Command 'A'
TX Command 'B'
TX Command 'A'
TX Command 'B'
79-Byte Payload
15-Byte Payload
Pad DWORD 1
End Padding
10-Byte
10-Byte
10-Byte
illustrates the TX command structure for this example, and also shows
Figure 3.13 TX Example 1
DATASHEET
1B
49
0
0
0
Data Passed to the
TX Data FIFO
TX Command 'A'
TX Command 'B'
TX Command 'A'
TX Command 'A'
79-Byte Payload
15-Byte Payload
17-Byte Payload
NOTE: Extra bytes
betw een buffers are
not transmitted
Revision 2.3 (08-06-08)