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LAN9500AI 数据表(PDF) 64 Page - Microchip Technology |
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LAN9500AI 数据表(HTML) 64 Page - Microchip Technology |
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64 / 213 page  LAN950x DS00001875A-page 64 2010 - 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 5-10: RXCOE CHECKSUM CALCULATION FIGURE 5-11: TYPE II ETHERNET FRAME FIGURE 5-12: ETHERNET FRAME WITH VLAN TAG DST SRC T Y P E Frame Data F C S Calculate Checksum 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 |
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