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LAN9250 Datasheet(PDF) 141 Page - Microchip Technology |
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LAN9250 Datasheet(HTML) 141 Page - Microchip Technology |
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141 / 421 page  2015 Microchip Technology Inc. DS00001913A-page 141 LAN9250 field, the controller will recognize the packet as a VLAN-tagged packet, allowing the packet to be received and pro- cessed by the host software. If both VLAN1 and VLAN2 tag Identifiers are used, each should be unique. If both are set to the same value, VLAN1 is given higher precedence and the maximum legal frame length is set to 1522. FIGURE 11-1: VLAN FRAME Preamble 7 Bytes SOF 1 Byte Dest. Addr. 6 Bytes Source Addr. 6 Bytes Type 2 Bytes Data 46-1500 Bytes FCS 4 Bytes Standard Ethernet Frame (1518 Bytes) Preamble 7 Bytes SOF 1 Byte Dest. Addr. 6 Bytes Source Addr. 6 Bytes Type 2 Bytes Data 46-1500 Bytes FCS 4 Bytes Ethernet Frame with VLAN TAG (1522 Bytes) TPID 2 Bytes Type 2 Bytes TPID 2 Bytes VLAN ID 12 Bits User Priority 3 Bits CFI 1 Bit Tag Control Information (TCI) Defines the VLAN to which the frame belongs Canonical Address Format Indicator Indicates the frame’s priority Tag Protocol ID: \x81-00 |
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