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KSZ9563RNXC 数据表(PDF) 32 Page - Microchip Technology |
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KSZ9563RNXC 数据表(HTML) 32 Page - Microchip Technology |
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32 / 226 page  KSZ9563R DS00002419D-page 32 2017-2018 Microchip Technology Inc. Note 4-1 VLAN Enable is bit 7 in the Switch Lookup Engine Control 0 Register Note 4-2 VLAN Match/Valid indicates when the VLAN Table entry is valid Note 4-3 Forward Option is a bit in the VLAN Table Entry 0 Register Note 4-4 Egress VLAN Filtering are bits 5 and 4 in the Switch Lookup Engine Control 2 Register Note 4-5 Unknown VID Forwarding is in the Unknown VLAN ID Control Register Note 4-6 Drop Invalid VID is bit 6 in the Switch Lookup Engine Control 0 Register Note 4-7 ALU Match/Valid indicates when the Address Lookup is a success Table 4-9 describes in more detail the address lookup process that follows the VLAN Table lookup. Lookup occurs in both the Address Lookup Table and the Static Address Table simultaneously, and the resulting action depends on the results of the two lookups. A source address (SA) lookup is also performed in the Address Lookup Table. SA lookup also performs SA filtering and MAC priority when the address is hit. Table 4-10 describes how learning is performed in the Address Lookup Table when a successful VLAN table lookup has been done and the no matching static entry is found in the Address Lookup Table or the Static Address Table. Note: “(def)” indicates the default power-up value. TABLE 4-9: HASHED(DA) + FID LOOKUP IN VLAN MODE DA found in Static MAC Table? Use FID Flag? (Static MAC Table) FID Match? DA+FID found in ALU Table? Action No Don’t Care Don’t Care No Lookup has failed. Broadcast to the membership ports defined in the VLAN Table No Don’t Care Don’t Care Yes Send to the destination port defined in the Address Lookup (ALU) Table Yes 0 Don’t Care Don’t Care Send to the destination port(s) defined in the Static Address Table Yes 1 No No Lookup has failed. Broadcast to the membership ports defined in the VLAN Table. Yes 1 No Yes Send to the destination port defined in the Address Lookup (ALU) Table Yes 1 Yes Don’t Care Send to the destination port(s) defined in the Static Address Table TABLE 4-10: HASHED(SA) + FID LOOKUP IN VLAN MODE FID + SA found in Address Lookup (ALU) Table? Action No Learn and add FID + SA to the Address Lookup (ALU) Table Yes If the static bit is 0, update the time stamp and the egress port map. If the static bit is 1, then nothing is done. |
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