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LAN9220 bảng dữ liệu(PDF) 49 Page - Microchip Technology

tên linh kiện LAN9220
Giải thích chi tiết về linh kiện  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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nhà sản xuất  MICROCHIP [Microchip Technology]
Trang chủ  http://www.microchip.com
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LAN9220 bảng dữ liệu(HTML) 49 Page - Microchip Technology

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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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