EVB9221-MINI SMSC, EVB9221-MINI Datasheet - Page 58

• Manufacturer Part Number: EVB9221-MINI
• Description: EVALUATION BOARD LAN9221-ABZJ
• Manufacturer: SMSC

Specifications of EVB9221-MINI

• Main Purpose: Interface, Ethernet Controller (PHY and MAC)
• Embedded: No
• Utilized Ic / Part: LAN9221
• Primary Attributes: 1 Port, 100BASE-TX/10BASE-T
• Secondary Attributes: 16-Bit, HP Auto-MDIX, Full and Half Duplex Support, 32-Bit CRC
• Processor To Be Evaluated: LAN9221
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 638-1074

Revision 2.7 (03-15-10)
Figure 3.15, "TX Example 1"
how data is passed to the TX data FIFO.
TX Com m and 'A'
Buffer End Alignment = 1
Data Start Offset = 7
First Segment = 1
Last Segment = 0
Buffer Size = 79
TX Com m and 'B'
Packet Length = 111
TX Com m and 'A'
Buffer End Alignment = 1
Data Start Offset = 0
First Segment = 0
Last Segment = 0
Buffer Size = 15
TX Com m and 'B'
Packet Length = 111
TX Com m and 'A'
Buffer End Alignment = 1
Data Start Offset = 10
First Segment = 0
Last Segment = 1
Buffer Size = 17
TX Com m and 'B'
Packet Length = 111
31
31
31
Ethernet Controller
Data Written to the
7-Byte Data Start Offset
17-Byte Payload Data
5-Byte End Padding
End Offset Padding
Data Start Offset
TX Command 'A'
TX Command 'B'
TX Command 'A'
TX Command 'B'
TX Command 'A'
TX Command 'B'
79-Byte Payload
15-Byte Payload
Pad DWORD 1
End Padding
10-Byte
10-Byte
10-Byte
illustrates the TX command structure for this example, and also shows
Figure 3.15 TX Example 1
DATASHEET
1B
58
0
0
0
High-Performance 16-bit Non-PCI 10/100 Ethernet Controller with Variable Voltage I/O
Data Passed to the
TX Data FIFO
TX Command 'A'
TX Command 'B'
TX Command 'A'
TX Command 'A'
79-Byte Payload
15-Byte Payload
17-Byte Payload
NOTE: Extra bytes
betw een buffers are
not transmitted
SMSC LAN9221/LAN9221i
Datasheet