LAN9117 datasheet(45/114 Pages) MICROCHIP | High Performance Single-Chip 10/100 Non-PCI Ethernet Controller

부품명	LAN9117

상세내용	High Performance Single-Chip 10/100 Non-PCI Ethernet Controller

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DS00002267A-page 45

LAN9117

3.13.6.2

TX Example 2

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

• 2-Byte “Data Start Offset”

• 183-Bytes of payload data

• 4-Byte “Buffer End Alignment”

Figure 3-16, "TX Example 2" 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’.

FIGURE 3-16:

TX EXAMPLE 2

TX Command 'A'

TX Command 'B'

Data Written to the

Ethernet Controller

TX Command 'B'

183-Byte Payload Data

Data Start Offset = 6

First Segment = 1

Last Segment = 1

Buffer Size =183

Packet Length = 183

TX Command 'A'

TX Command 'B'

Data Passed to the

TX Data FIFO

Buffer End Alignment = 0

3B End Padding

TX Command 'A'

6-Byte Data Start Offset

183-Byte Payload Data

NOTE: Extra bytes between buffers

are not transmitted

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