LAN89218AQ Standard Microsystems (SMSC), LAN89218AQ Datasheet - Page 65

• Manufacturer Part Number: LAN89218AQ
• Manufacturer: Standard Microsystems (SMSC)

Specifications of LAN89218AQ

• Lead Free Status / RoHS Status: Compliant

High Performance Single-Chip 10/100 Ethernet Controller for Automotive Applications
Datasheet
SMSC LAN89218
TX Checksum Enable = 1
TX Command 'A'
Buffer End Alignment = 1
Data Start Offset = 4
First Segment = 1
Last Segment = 0
Buffer Size = 4
TX Command 'B'
Packet Length = 115
Checksum Preamble
TX Checksum Location = 50
TX Checksum Start Pointer = 14
TX Command 'A'
Buffer End Alignment = 1
Data Start Offset = 7
First Segment = 0
Last Segment = 0
Buffer Size = 79
TX Command 'B'
Packet Length = 115
TX Checksum Enable = 1
TX Command 'A'
Buffer End Alignment = 1
Data Start Offset = 0
First Segment = 0
Last Segment = 0
Buffer Size = 15
TX Command 'B'
Packet Length = 115
TX Checksum Enable = 1
TX Command 'A'
Buffer End Alignment = 1
Data Start Offset = 10
First Segment = 0
Last Segment = 1
Buffer Size = 17
TX Command 'B'
Packet Length = 115
TX Checksum Enable = 1
31
31
31
31
Ethernet Controller
Data Written to the
TX Checksum Preamble
4-Byte Data Start Offset
7-Byte Data Start Offset
17-Byte Payload Data
5-Byte End Padding
8-Byte End Padding
End Offset Padding
TX Command 'A'
TX Command 'B'
TX Command 'A'
TX Command 'B'
TX Command 'A'
TX Command 'B'
TX Command 'A'
TX Command 'B'
Data Start Offset
79-Byte Payload
15-Byte Payload
Pad DWORD 1
End Padding
10-Byte
10-Byte
10-Byte
Figure 3.24 TX Example 3
DATASHEET
1B
0
0
0
0
65
NOTE: When enabled, the TX Checksum
P r e a m b l e i s p r e - p e n d e d t o d a t a t o b e
transmitted. The FS bit in TX Command 'A', the
CK bit in TX Command 'B' and the TXCOE_EN
bit in the COE_CR register must all be set for
the TX checksum to be generated. FS must
not be set for subsequent fragments of the
same packet.
Data Passed to the
TX Checksum Preamble
TX Data FIFO
TX Command 'A'
TX Command 'B'
TX Command 'A'
79-Byte Payload
TX Command 'A'
15-Byte Payload
TX Command 'A'
17-Byte Payload
NOTE: Extra bytes
between buffers are
not transmitted
Revision 1.3 (02-23-10)