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LAN9730 データシート(PDF) 74 Page - Microchip Technology

部品番号 LAN9730
部品情報  High-Speed Inter-Chip USB 2.0 to 10/100 Ethernet Controller
PDF  222 Pages
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メーカー  MICROCHIP [Microchip Technology]
ホームページ  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

LAN9730 データシート(HTML) 74 Page - Microchip Technology

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LAN9730/LAN9730i
DS00001946A-page 74
 2012-2015 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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