LAN9500AI datasheet(54/213 Pages) MICROCHIP

54 / 213 page

LAN950x

DS00001875A-page 54

 2010 - 2015 Microchip Technology Inc.

Note:

When enabled, the TX Checksum Preamble is pre-pended to the data to be transmitted. The FS bit in TX

Command A, the TX Checksum Enable bit (CK) of TX Command B, and the TXCOE_EN bit of 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. Please refer to Section 5.5.8, "Transmit Checksum Offload Engine

(TXCOE)" for further information.

FIGURE 5-8:

TX EXAMPLE 3

TX Command A

TX Command B

TX Command A

TX Command B

115 Byte

Ethernet

Frame

15 Byte Payload

79 Byte Payload

USB Packet 0

TX Command A

TX Command B

TX Command A

Data Start Offset = 0

First Segment = 1

Last Segment = 0

Buffer Size = 4

TX Command B

Frame Length = 111

TX Checksum Enable = 1

Checksum Preamble

TX Checksum Location = 50

TX Checksum Start Pointer = 14

Checksum Preamble

TX Command A

Data Start Offset = 3

First Segment = 0

Last Segment = 0

Buffer Size = 79

TX Command B

Frame Length = 111

TX Checksum Enable = 1

TX Command A

TX Command B

TX Command A

TX Command B

TX Command A

Data Start Offset = 0

First Segment = 0

Last Segment = 0

Buffer Size = 15

TX Command B

Frame Length = 111

TX Checksum Enable = 1

TX Command A

Data Start Offset = 2

First Segment = 0

Last Segment = 1

Buffer Size = 17

TX Command B

Frame Length = 111

TX Checksum Enable = 1

17 Byte Payload

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