LAN9250 datasheet(169/421 Pages) MICROCHIP

169 / 421 page

 2015 Microchip Technology Inc.

DS00001913A-page 169

LAN9250

FIGURE 11-14:

TX EXAMPLE 3

Pad DWORD 1

7-Byte Data Start Offset

10-Byte

End Padding

Buffer End Alignment = 1

Data Start Offset = 7

First Segment = 0

Last Segment = 0

Buffer Size = 79

10-Byte

End Offset Padding

Buffer End Alignment = 1

Data Start Offset = 0

First Segment = 0

Last Segment = 0

Buffer Size = 15

Buffer End Alignment = 1

Data Start Offset = 10

First Segment = 0

Last Segment = 1

Buffer Size = 17

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

79-Byte Payload

15-Byte Payload

17-Byte Payload

NOTE:

When enabled, the TX Checksum

Preamble is pre-pended to data to be

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.

4-Byte Data Start Offset

8-Byte End Padding

Buffer End Alignment = 1

Data Start Offset = 4

First Segment = 1

Last Segment = 0

Buffer Size = 4

Packet Length = 115

TX Command 'A'

TX Command 'B'

TX Checksum Location = 50

Checksum Preamble

TX Checksum Start Pointer = 14

TX Checksum Preamble

79-Byte Payload

15-Byte Payload

17-Byte Payload Data

TX Checksum Enable = 1

Packet Length = 115

TX Checksum Enable = 1

Packet Length = 115

TX Checksum Enable = 1

Packet Length = 115

TX Checksum Enable = 1

TX Command 'A'

TX Command 'B'

TX Command 'A'

TX Command 'B'

TX Command 'A'

TX Command 'B'

TX Command 'A'

TX Command 'B'

TX Command 'A'

TX Command 'B'

TX Command 'A'

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