LAN9221i SMSC [SMSC Corporation], LAN9221i Datasheet - Page 59

• Manufacturer Part Number: LAN9221i
• Description: High-Performance 16-bit Non-PCI 10/100 Ethernet Controller with Variable Voltage I/O
• Manufacturer: SMSC [SMSC Corporation]

High-Performance 16-bit Non-PCI 10/100 Ethernet Controller with Variable Voltage I/O
Datasheet
SMSC LAN9221/LAN9221i
3.12.6.2
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:
Figure 3.16, "TX Example 2"
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'
illustrates the TX command structure for this example, and also shows
Figure 3.16 TX Example 2
3B End Padding
DATASHEET
59
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 2.6 (12-04-08)