lan9115 Standard Microsystems Corp., lan9115 Datasheet - Page 55

• Manufacturer Part Number: lan9115
• Description: Lan9115 Highly Efficient Single-chip 10/100 Non-pci Ethernet Controller
• Manufacturer: Standard Microsystems Corp.

Highly Efficient Single-Chip 10/100 Non-PCI Ethernet Controller
Datasheet
SMSC LAN9115
3.13.6.2
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" 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 3.16 TX Example 2
3B End Padding
DATASHEET
55
0
NOTE: Extra bytes between buffers
are not transmitted
Data Passed to the
183-Byte Payload Data
TX Data FIFO
TX Command 'A'
TX Command 'B'
Revision 1.5 (07-11-08)