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LAN9211 bảng dữ liệu(PDF) 57 Page - SMSC Corporation |
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LAN9211 bảng dữ liệu(HTML) 57 Page - SMSC Corporation |
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57 / 147 page ![]() High-Performance Small Form Factor Single-Chip Ethernet Controller with HP Auto-MDIX Support Datasheet SMSC LAN9211 57 Revision 2.9 (03-01-12) DATASHEET 3.12.6.2 TX Example 2 In this example, a single 183-Byte Ethernet packet will be transmitted. This packet is in a single buffer as follows: 2-Byte “Data Start Offset” 183-Bytes of payload data 4-Byte “Buffer End Alignment” Figure 3.22, "TX Example 2" illustrates the TX command structure for this example, and also shows how data is passed to the TX data FIFO. Note that the packet resides in a single TX Buffer, therefore both the FS and LS bits are set in TX command ‘A’. Figure 3.22 TX Example 2 TX Command 'A' 0 31 TX Command 'B' Data Written to the Ethernet Controller TX Command 'B' 183-Byte Payload Data Data Start Offset = 6 First Segment = 1 Last Segment = 1 Buffer Size =183 Packet Length = 183 TX Command 'A' TX Command 'B' Data Passed to the TX Data FIFO Buffer End Alignment = 0 3B End Padding TX Command 'A' 6-Byte Data Start Offset 183-Byte Payload Data NOTE: Extra bytes between buffers are not transmitted |
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