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LAN9211 bảng dữ liệu(PDF) 58 Page - SMSC Corporation

tên linh kiện LAN9211
Giải thích chi tiết về linh kiện  High-Performance Small Form Factor Single-Chip Ethernet Controller with HP Auto-MDIX Support
PDF  147 Pages
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nhà sản xuất  SMSC [SMSC Corporation]
Trang chủ  http://www.smsc.com
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LAN9211 bảng dữ liệu(HTML) 58 Page - SMSC Corporation

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High-Performance Small Form Factor Single-Chip Ethernet Controller with HP Auto-MDIX Support
Datasheet
Revision 2.9 (03-01-12)
58
SMSC LAN9211
DATASHEET
3.12.6.3
TX Example 3
In this example a single, 111-Byte Ethernet packet will be transmitted with a TX checksum. This packet
is divided into four buffers. The four buffers are as follows:
Buffer 0:
4-Byte “Data Start Offset”
4-Byte Checksum Preamble
16-Byte “Buffer End Alignment”
Buffer 1:
7-Byte “Data Start Offset”
79-Bytes of payload data
16-Byte “Buffer End Alignment”
Buffer 2:
0-Byte “Data Start Offset”
15-Bytes of payload data
16-Byte “Buffer End Alignment”
Buffer 3:
10-Byte “Data Start Offset”
17-Bytes of payload data
16-Byte “Buffer End Alignment”
Figure 3.21, "TX Example 1" illustrates the TX command structure for this example, and also shows
how data is passed to the TX data FIFO.
Note: In order to perform a TX checksum calculation on the associated packet, bit 14 (CK) of the TX
Command ‘B’ must be set in conjunction with bit 13 (FS) of TX Command ‘A’ and bit 16
(TXCOE_EN) of the COE_CR register. For more information, refer to Section 3.6.2, "Transmit
Checksum Offload Engine (TXCOE)".



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