LAN9218I_07 Datasheet, PDF (49/133 Pages) SMSC Corporation – High-Performance Single-Chip 10/100 Ethernet Controller with HP Auto-MDIX and Industrial Temperature Support

High-Performance Single-Chip 10/100 Ethernet Controller with HP Auto-MDIX and Industrial Temperature Support
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
SMSC LAN9218i
5-Byte EndP a ddi ng
Figure 3.13 TX Example 1
49
DATASHEET
Revision 1.8 (06-06-07)