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LAN9500AI 数据表(PDF) 65 Page - Microchip Technology |
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LAN9500AI 数据表(HTML) 65 Page - Microchip Technology |
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65 / 213 page ![]() 2010 - 2015 Microchip Technology Inc. DS00001875A-page 65 LAN950x The RXCOE supports a maximum of two VLAN tags. If there are more than two VLAN tags, the VLAN protocol identifier for the third tag is treated as an Ethernet type field. The checksum calculation will begin immediately after the type field. FIGURE 5-13: ETHERNET FRAME WITH LENGTH FIELD AND SNAP HEADER FIGURE 5-14: ETHERNET FRAME WITH VLAN TAG AND SNAP HEADER FIGURE 5-15: ETHERNET FRAME WITH MULTIPLE VLAN TAGS AND SNAP HEADER 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 DST SRC 8 1 0 0 V I D L3 Packet F C S S N A P 0 S N A P 1 3 L e n 0 1 2 {DSAP, SSAP, CTRL, OUI[23:16]} {OUI[15:0], PID[15:0]} 4 5 6 Calculate Checksum 1DWORD DST SRC 8 1 0 0 V I D L3 Packet F C S S N A P 0 S N A P 1 5 L e n 0 1 2 {DSAP, SSAP, CTRL, OUI[23:16]} {OUI[15:0], PID[15:0]} 6 7 8 Calculate Checksum 8 1 0 0 V I D 4 1DWORD |
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