LAN9218 Datasheet, PDF (48/130 Pages) SMSC Corporation – High-Performance Single- Chip 10/100 Ethernet Controller with HP Auto-MDIX

High-Performance Single-Chip 10/100 Ethernet Controller with HP Auto-MDIX
Datasheet
Figure 3.13, "TX Example 1" illustrates the TX command structure for this example, and also shows
how data is passed to the TX data FIFO.
Data W ritten to the
Ethernet Controller
31
0
TX Com m and 'A'
Buff er End Alignment = 1
TX Com m a nd'A'
Data Start Of fset = 7
First Segment = 1
TX Com m a nd'B'
Last Segment = 0
Buff er Size = 79
7-Byte Data Start Offset
TX Com m and 'B'
Packet Length = 111
Data Passed to the
TX Data FIFO
TX Com m a nd'A'
TX Com m a nd'B'
79-Byte P a yloa d
Pad DW ORD 1
10-Byte
EndP a ddi ng
31
TX Com m and 'A'
Buff er End Alignment = 1
Data Start Of fset = 0
First Segment = 0
Last Segment = 0
Buff er Size = 15
TX Com m and 'B'
Packet Length = 111
0
TX Com m a nd'A'
TX Com m a nd'B'
15-Byte P a yloa d
1B
31
0
TX Com m and 'A'
Buff er End Alignment = 1
10-Byte
EnTdXOCoffsmemtPaanddd'Ain'g
Data Start Of fset = 10
TX Com m a nd'B'
First Segment = 0
Last Segment = 1
10-Byte
Buff er Size = 17
Data Start Offset
TX Com m and 'B'
Packet Length = 111
17-Byte P a yl oa dDa ta
79-Byte P a yl oa d
TX Com m a nd'A'
15-Byte P a yl oa d
TX Com m a nd'A'
17-Byte P a yl oa d
NOTE: Extra bytes
betw een buffers are
not transmitted
Revision 1.5 (07-18-06)
5-Byte EndP a ddi ng
Figure 3.13 TX Example 1
48
DATASHEET
SMSC LAN9218