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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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VSC7440 датащи(PDF) 203 Page - Microsemi Corporation |
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VSC7440 датащи(HTML) 203 Page - Microsemi Corporation |
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203 / 444 page  Functional Descriptions VMDS-10492 VSC7440 Datasheet Revision 4.2 186 The PGID table is organized as shown in the following illustration. Figure 40 • PGID Layout The forwarding process generates a forwarding decision that is used to perform a lookup in the PGID table. The following forwarding decisions are possible. • Flood forwarding to one of the six flood masks located from address 11 to address 16 in the PGID table is used as destination mask. • Unicast forwarding to {UPSID,UPSPN}. UPSID is checked against ANA_AC::COMMON_VSTAX_CFG.OWN_UPSID: If identical, destination mask is found based on lookup of UPSPN within the front port destinations of the PGID table (address 0 to 10). If not identical, destination mask is found based on lookup of UPSID in ANA_AC:UPSID:UPSID_CFG. • Multicast forwarding: mc_idx is looked up in the PGID table with an offset of 11. Based on the returned entry stack bit: If cleared, the returned entry mask is interpreted as a destination mask. If set, the returned entry mask is {UPSID,UPSPN} and the destination mask is found based on lookup of UPSID in ANA_AC:UPSID:UPSID_CFG. • REQ destination set (REQ.COMMON.PORT_MASK when REQ.COMMON.MASK_MODE=REPLACE_PGID). Destination set (REQ.COMMON.PORT_MASK from VCAP CLM or VCAP IS2 is directly used as destination mask without PGID lookup. • REQ.L2_FWD cleared. Frame is discarded. It is possible to generate a CPU copy can be generated when using the PGID lookup. If ANA_AC:PGID:PGID_MISC_CFG.PGID_CPU_COPY_ENA is set in the used PGID entry, a copy is sent to CPU queue specified by ANA_AC:PGID:PGID_MISC_CFG.PGID_CPU_QU. The following illustration depicts the PGID lookup decision. front port unicast destination masks x00b 0x000 port 0 destination mask port 1 destination mask port 10 destination mask L2 unicast flood mask L2 multicast flood mask IP4 MC data flood mask IP4 MC control flood mask IP6 MC data flood mask IP6 MC control flood mask 0x011 0x10b 0x20a GLAG 0 mbr 0 GLAG 0 mbr 1 GLAG 31 mbr 7 general purpose destination 0 PGID ADDR flood destination masks General purpose destinations mc_idx:0x006 mc_idx:0x0ff mc_idx:0x000 GLAG or General purpose destinations STACK interpret? mc_idx:0x1ff general purpose destination 1 general purpose destination n front port mask 0 0 0 0 0 0 0 0 0 0 or 52 0 1 52 upspn 0 5 upsid 9 reserved (must be zero) |
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