LAN9220-ABZJ View Datasheet(PDF) - SMSC -> Microchip

Part Name

Description

MFG CO.

LAN9220-ABZJ

16-bit Non-PCI Small Form Factor 10/100 Ethernet Controller with Variable Voltage I/O & HP Auto-MDIX Support

SMSC -> Microchip 

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16-bit Non-PCI Small Form Factor 10/100 Ethernet Controller with Variable Voltage I/O & HP Auto-MDIX Support

Datasheet

Figure 3.15, "TX Example 1" illustrates the TX command structure for this example, and also shows

how data is passed to the TX data FIFO.

Data Written to the

Ethernet Controller

31

0

TX Com m and 'A'

Buffer End Alignment = 1

TXCommand'A'

Data Start Offset = 7

First Segment = 1

TXCommand'B'

Last Segment = 0

Buffer Size = 79

7-Byte Data Start Offset

TX Com m and 'B'

Packet Length = 111

Data Passed to the

TX Data FIFO

TXCommand'A'

TXCommand'B'

79-BytePayload

Pad DWORD 1

10-Byte

EndPadding

31

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

0

TXCommand'A'

TXCommand'B'

15-BytePayload

1B

31

0

TX Com m and 'A'

Buffer End Alignment = 1

10-Byte

EnTXdOCoffmsemtPaanddd'iAn'g

Data Start Offset = 10

TXCommand'B'

First Segment = 0

Last Segment = 1

10-Byte

Buffer Size = 17

Data Start Offset

TX Com m and 'B'

Packet Length = 111

17-BytePayloadData

79-BytePayload

TXCommand'A'

15-BytePayload

TXCommand'A'

17-BytePayload

NOTE: Extra bytes

betw een buffers are

not transmitted

5-ByteEndPadding

Figure 3.15 TX Example 1

SMSC LAN9220

57

DATASHEET

Revision 2.7 (03-15-10)

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