LAN9250 datasheet(166/421 Pages) MICROCHIP

166 / 421 page

LAN9250

DS00001913A-page 166

 2015 Microchip Technology Inc.

Figure 11-12 illustrates the TX command structure for this example, and also shows how data is passed to the TX Data

FIFO.

FIGURE 11-12:

TX EXAMPLE 1

TX Command 'A'

TX Command 'B'

Pad DWORD 1

7-Byte Data Start Offset

10-Byte

End Padding

79-Byte Payload

Buffer End Alignment = 1

Data Start Offset = 7

First Segment = 1

Last Segment = 0

Buffer Size = 79

Packet Length = 111

TX Command 'A'

TX Command 'B'

10-Byte

End Offset Padding

15-Byte Payload

Buffer End Alignment = 1

Data Start Offset = 0

First Segment = 0

Last Segment = 0

Buffer Size = 15

Packet Length = 111

TX Command 'A'

TX Command 'B'

Buffer End Alignment = 1

Data Start Offset = 10

First Segment = 0

Last Segment = 1

Buffer Size = 17

Packet Length = 111

10-Byte

Data Start Offset

TX Command 'A'

TX Command 'B'

TX Command 'A'

TX Command 'B'

TX Command 'A'

TX Command 'B'

NOTE: Extra bytes

between buffers are

not transmitted

Data Written to the

Memory Mapped

TX Data FIFO Port

Data Passed to the

TX Data FIFO

5-Byte End Padding

17-Byte Payload Data

TX Command 'A'

TX Command 'B'

TX Command 'A'

79-Byte Payload

15-Byte Payload

17-Byte Payload

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