LAN9500AI datasheet(53/213 Pages) MICROCHIP

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DS00001875A-page 53

LAN950x

5.4.2.8

TX Example 2

In this example, a single 183-Byte Ethernet frame will be transmitted. This packet is in a single buffer as follows:

• 2-Byte “Data Start Offset”

• 183-Bytes of payload data

FIGURE 5-7: TX Example 2 on page 53 illustrates the TX command structure for this example, and also shows how

data is passed to the TX data FIFO. Note that the packet resides in a single TX Buffer, therefore both the FS and LS

bits are set in TX Command A.

5.4.2.9

TX Example 3

In this example a single, 111-Byte Ethernet frame will be transmitted with a TX checksum. This packet is divided into

four buffers. The four buffers are as follows:

Buffer 0:

• 0-Byte “Data Start Offset”

• 4-Byte Checksum Preamble

Buffer 1:

• 3-Byte “Data Start Offset”

• 79-Bytes of payload data

Buffer 2:

• 0-Byte “Data Start Offset”

• 15-Bytes of payload data

Buffer 3:

• 2-Byte “Data Start Offset”

• 17-Bytes of payload data

FIGURE 5-8: TX Example 3 on page 54 illustrates the TX command structure for this example, and also shows how

data is passed to the TX data FIFO.

FIGURE 5-7:

TX EXAMPLE 2

TX Command A

TX Command B

TX Command A

TX Command B

183 Byte

Ethernet

Frame

183 Byte Payload

USB Packet 0

TX Command A

Data Start Offset = 2

First Segment = 1

Last Segment = 1

Buffer Size = 183

TX Command B

Frame Length = 183

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