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LAN9217_07 Datasheet, PDF (53/137 Pages) SMSC Corporation – 16-bit High-Performance Single-Chip 10/100 Ethernet Controller with HP Auto-MDIX | |||
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16-bit High-Performance Single-Chip 10/100 Ethernet Controller with HP Auto-MDIX
Datasheet
3.12.6.2 TX Example 2
In this example, a single 183-Byte Ethernet packet will be transmitted. This packet is in a single buffer
as follows:
 2-Byte âData Start Offsetâ
 183-Bytes of payload data
 4-Byte âBuffer End Alignmentâ
Figure 3.15, "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 âAâ.
TX Command 'A'
Buffer End Alignment = 0
Data Start Offset = 6
First Segment = 1
Last Segment = 1
Buffer Size =183
Data Written to the
Ethernet Controller
31
0
TX Command 'A'
TX Command 'B'
6-Byte Data Start Offset
TX Command 'B'
Packet Length = 183
Data Passed to the
TX Data FIFO
TX Command 'A'
TX Command 'B'
183-Byte Payload Data
183-Byte Payload Data
SMSC LAN9217
3B End Padding
NOTE: Extra bytes between buffers
are not transmitted
Figure 3.15 TX Example 2
53
DATASHEET
Revision 1.8 (06-06-07)
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