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PM3351-SW Datasheet(PDF) 79 Page - PMC-Sierra, Inc |
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PM3351-SW Datasheet(HTML) 79 Page - PMC-Sierra, Inc |
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79 / 268 page  PM3351 ELAN 1X100 DATA SHEET PMC-970113 ISSUE 3 SINGLE PORT FAST ETHERNET SWITCH PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE 73 Variable Name Width (bits) Description cdHStruct 24 Pointer to head of linked-list of free hash buckets cdSStruct 24 Pointer to head of linked-list of forwarding tags cdDFIFOwr 24 Pointer to head entry in Distribution FIFO Error! No index entries found. Error! No index entries found. Error! No index entries found. cdTotCollide 32 Total number of collisions encountered on MAC port cdDStruct 24 Pointer to head of free data descriptor pool reserved for holding messages cdCurrentXPD 24 Temporary storage: holds address of expansion port descriptor currently in use cdLNR 32 Temporary save space for LNR register in Switch Processor cdFirstHash 24 Temporary storage: holds the address of the first hash bucket or forwarding tag in a chain of address table entries cdHashIdxMask 16 Bitmask used to restrict the range of the hash key computed as an index into the hash array cdRefMask 16 Global bitmask restricting devices and ports to which multicasts and broadcasts may be directed * 8 LSBs are unused, set to zero * 8 MSBs correspond to the eight possible devices in a system cdChipNum 8 Logical chip number assigned to this ELAN 1x100 cdNumChips 8 Total number of ELAN chips in system (both ELAN 1x100 and others) cdPCIRefCount 8 Reference count to use during broadcasts cdAgeTick 8 Aging task trigger flag cdAgeEnable 8 Aging task enable flag cdDDsInRingShift 16 Log2 of number of elements in each transfer ring structure cdFPullTl 24 Pointer to tail of management frame being extracted from internal transmit FIFO by firmware cdFPullHd 24 Pointer to head of management frame being extracted from internal transmit FIFO by firmware cdFPullBytes 16 Number of bytes remaining for management frame being read out of internal transmit FIFO by firmware cdDispatchPCI 24 Pointer to next free message data descriptor to use for queueing messages for background processing cdFPush 24 Pointer to management frame being written into internal transmit FIFO by firmware |
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