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LAN89730 bảng dữ liệu(PDF) 74 Page - Microchip Technology

tên linh kiện LAN89730
Giải thích chi tiết về linh kiện  Implements Reduced Power Operating Modes
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nhà sản xuất  MICROCHIP [Microchip Technology]
Trang chủ  http://www.microchip.com
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LAN89730 bảng dữ liệu(HTML) 74 Page - Microchip Technology

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LAN89730
DS60001348A-page 74
 2013-2015 Microchip Technology Inc.
Figure 4-16 illustrates the use of a pre-pended checksum preamble when transmitting an Ethernet frame consisting of
3 payload buffers.
FIGURE 4-16:
TX EXAMPLE ILLUSTRATING A PRE-PENDED TX CHECKSUM PREAMBLE
TX Command 'A'
Pad DWORD 1
TX Command 'A'
TX Command 'B'
10-Byte
End Offset Padding
Payload Fragment 2
TX Command 'A'
TX Command 'B'
Data Written to the
Device
Payload Fragment 3
TX Command 'A'
TX Command 'B'
TX Checksum Preamble
Note: The TX Checksum Preamble is
pre-pended to data to be transmitted.
FS is set in TX Command 'A' and CK is
set in TX Command 'B'. No start offset
may be added. FS must not be set for
subsequent fragments of the same
packet.
TX Command 'B'
Payload Fragment 1



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