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LAN9211 Scheda tecnica(PDF) 29 Page - SMSC Corporation |
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LAN9211 Scheda tecnica(HTML) 29 Page - SMSC Corporation |
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29 / 147 page  High-Performance Small Form Factor Single-Chip Ethernet Controller with HP Auto-MDIX Support Datasheet SMSC LAN9211 29 Revision 2.9 (03-01-12) DATASHEET In mode 1, the RXCOE supports VLAN tags and a SNAP header. In this mode the RXCOE calculates the checksum at the start of L3 packet. The VLAN1 tag register is used by the RXCOE to indicate what protocol type is to be used to indicate the existence of a VLAN tag. This value is typically 8100h. Example frame configurations: Figure 3.3 Type II Ethernet Frame Figure 3.4 Ethernet Frame with VLAN Tag Figure 3.5 Ethernet Frame with Length Field and SNAP Header DST SRC p r o t 0 1 2 3 L3 Packet F C S Calculate Checksum 1DWORD DST SRC 8 1 0 0 V I D 0 1 2 3 t y p e 4 L3 Packet F C S Calculate Checksum 1DWORD DST SRC L3 Packet F C S S N A P 0 S N A P 1 L e n 0 1 2 {DSAP, SSAP, CTRL, OUI[23:16]} {OUI[15:0], PID[15:0]} 3 4 5 Calculate Checksum 1DWORD |
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