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LAN9220 Datasheet(PDF) 49 Page - Microchip Technology

No. de pieza LAN9220
Descripción Electrónicos  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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Fabricante Electrónico  MICROCHIP [Microchip Technology]
Página de inicio  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

LAN9220 Datasheet(HTML) 49 Page - Microchip Technology

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 2006-2017 Microchip Technology Inc.
DS00002417A-page 49
LAN9220
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 3.6.3, "Transmit Checksum Offload Engine (TXCOE)".



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