LAN9118MT Standard Microsystems (SMSC), LAN9118MT Datasheet - Page 63

• Manufacturer Part Number: LAN9118MT
• Manufacturer: Standard Microsystems (SMSC)

High-Performance Single-Chip 10/100 Non-PCI Ethernet Controller
Datasheet
SMSC LAN9118
4.12.6.1
TX Command 'A'
Buffer End Alignment = 0
Data Start Offset = 6
First Segment = 1
Last Segment = 1
Buffer Size =183
TX Command 'B'
Packet Length = 183
TX Example 2
In this example, a single 183-Byte Ethernet packet will be transmitted. This packet is in a single buffer
as follows:
■
■
■
The following figure illustrates the TX command structure for this example, and also shows how data
is passed to the TX data FIFO. Note that the packet resides in a single TX Buffer, therefore both the
FS and LS bits are set in TX command ‘A’.
2-Byte “Data Start Offset”
183-Bytes of payload data
4-Byte “Buffer End Alignment”
31
Ethernet Controller
Data Written to the
6-Byte Data Start Offset
183-Byte Payload Data
TX Command 'A'
TX Command 'B'
Figure 4.15 TX Example 2
3B End Padding
DATASHEET
63
0
NOTE: Extra bytes between buffers
are not transmitted
Data Passed to the
183-Byte Payload Data
TX Data FIFO
TX Command 'B'
TX Command 'A'
Revision 1.0 (03-17-05)