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LAN9117 데이터시트(HTML) 45 Page - Microchip Technology

부품명 LAN9117
상세내용  High Performance Single-Chip 10/100 Non-PCI Ethernet Controller
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제조사  MICROCHIP [Microchip Technology]
홈페이지  http://www.microchip.com
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LAN9117 데이터시트(HTML) 45 Page - Microchip Technology

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 2005-2016 Microchip Technology Inc.
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'
0
31
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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