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LAN9500AI датащи(PDF) 54 Page - Microchip Technology

номер детали LAN9500AI
подробное описание детали  LAN950x USB 2.0 to 10/100 Ethernet Controller
PDF  213 Pages
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

LAN9500AI датащи(HTML) 54 Page - Microchip Technology

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LAN950x
DS00001875A-page 54
 2010 - 2015 Microchip Technology Inc.
Note:
When enabled, the TX Checksum Preamble is pre-pended to the data to be transmitted. The FS bit in TX
Command A, the TX Checksum Enable bit (CK) of TX Command B, and the TXCOE_EN bit of the
COE_CR register must all be set for the TX checksum to be generated. FS must not be set for subsequent
fragments of the same packet. Please refer to Section 5.5.8, "Transmit Checksum Offload Engine
(TXCOE)" for further information.
FIGURE 5-8:
TX EXAMPLE 3
TX Command A
TX Command B
TX Command A
TX Command B
115 Byte
Ethernet
Frame
15 Byte Payload
79 Byte Payload
USB Packet 0
TX Command A
TX Command B
TX Command A
Data Start Offset = 0
First Segment = 1
Last Segment = 0
Buffer Size = 4
TX Command B
Frame Length = 111
TX Checksum Enable = 1
Checksum Preamble
TX Checksum Location = 50
TX Checksum Start Pointer = 14
.
.
.
Checksum Preamble
TX Command A
Data Start Offset = 3
First Segment = 0
Last Segment = 0
Buffer Size = 79
TX Command B
Frame Length = 111
TX Checksum Enable = 1
TX Command A
TX Command B
TX Command A
TX Command B
TX Command A
Data Start Offset = 0
First Segment = 0
Last Segment = 0
Buffer Size = 15
TX Command B
Frame Length = 111
TX Checksum Enable = 1
TX Command A
Data Start Offset = 2
First Segment = 0
Last Segment = 1
Buffer Size = 17
TX Command B
Frame Length = 111
TX Checksum Enable = 1
17 Byte Payload



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