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LAN9220 bảng dữ liệu(PDF) 48 Page - Microchip Technology

tên linh kiện LAN9220
Giải thích chi tiết về linh kiện  16-bit Non-PCI Small Form Factor 10/100 Ethernet Controller with Variable Voltage I/O & HP Auto-MDIX Support
PDF  142 Pages
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nhà sản xuất  MICROCHIP [Microchip Technology]
Trang chủ  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

LAN9220 bảng dữ liệu(HTML) 48 Page - Microchip Technology

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LAN9220
DS00002417A-page 48
 2006-2017 Microchip Technology Inc.
3.12.6.2
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 3-22, "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 3-22:
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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