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LAN89730 Datasheet(PDF) 70 Page - Microchip Technology |
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LAN89730 Datasheet(HTML) 70 Page - Microchip Technology |
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70 / 218 page  LAN89730 DS60001348A-page 70 2013-2015 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 4-11: TYPE II ETHERNET FRAME FIGURE 4-12: ETHERNET FRAME WITH VLAN TAG FIGURE 4-13: 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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