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LAN9211 bảng dữ liệu(PDF) 56 Page - SMSC Corporation |
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LAN9211 bảng dữ liệu(HTML) 56 Page - SMSC Corporation |
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56 / 147 page ![]() High-Performance Small Form Factor Single-Chip Ethernet Controller with HP Auto-MDIX Support Datasheet Revision 2.9 (03-01-12) 56 SMSC LAN9211 DATASHEET 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. Figure 3.21 TX Example 1 TXCommand'A' 0 31 TXCommand'B' Pad DWORD 1 7-Byte Data Start Offset 10-Byte EndPadding 79-BytePayload Buffer End Alignment = 1 Data Start Offset = 7 First Segment = 1 Last Segment = 0 Buffer Size = 79 Packet Length = 111 TXCommand'A' 0 31 TXCommand'B' 10-Byte EndOffsetPadding 15-BytePayload Buffer End Alignment = 1 Data Start Offset = 0 First Segment = 0 Last Segment = 0 Buffer Size = 15 Packet Length = 111 TXCommand'A' 0 31 TXCommand'B' Buffer End Alignment = 1 Data Start Offset = 10 First Segment = 0 Last Segment = 1 Buffer Size = 17 Packet Length = 111 10-Byte Data Start Offset TX Com mand 'A' TX Com mand 'B' TX Com mand 'A' TX Com mand 'B' TX Com mand 'A' TX Com mand 'B' NOTE: Extra bytes betw een buffers are not transmitted Data Written to the Ethernet Controller Data Passed to the TX Data FIFO 5-ByteEndPadding 17-BytePayloadData TXCommand'A' TXCommand'B' TXCommand'A' TXCommand'A' 1B 79-BytePayload 15-BytePayload 17-BytePayload |
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