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LAN9220 Datasheet(PDF) 22 Page - Microchip Technology |
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LAN9220 Datasheet(HTML) 22 Page - Microchip Technology |
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22 / 142 page  LAN9220 DS00002417A-page 22 2006-2017 Microchip Technology Inc. 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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