PM3350-SW datasheet(97/224 Pages) PMC

97 / 224 page

ELAN 8X10

PM3350 ELAN 8 X10

DATA SHEET

PMC-970109

ISSUE 3

8 PORT ETHERNET SWITCH

PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND PMC-SIERRA, INC. CUSTOMERS ONLY

8x10), and frames directed to this MAC address should be directed to that device via

the PCI expansion port. Forwarding tags have the following format:

24 23

16 15

8 7

0 Byte Offset

ChipNum

NextFT

MACAddr[23:16]

MACAddr[31:24]

MACAddr[7:0]

MACAddr[15:8]

MulticastMask

MACAddr[39:32]

MACAddr[47:40]

FTFlags

SrcHashBkt

NextFT:

24-bit pointer to next forwarding tag (or hash bucket) in linked-list; NULL if

none.

ChipNum:

8-bit index assigned to remote device corresponding to this forwarding tag.

MACAddr:

48-bit IEEE 802.3 MAC address associated with this forwarding tag.

MulticastMask:

16-bit mask used to restrict multicasts directed to this MAC address to a

subset of the devices in the system. Only valid for multicast MAC addresses,

as indicated by the proper setting of the HBFlags field.

SrcHashBkt:

24-bit address of the target hash bucket within the remote device that

contains the primary frame handling and statistics information for this MAC

address.

FTFlags:

8-bit per-MAC forwarding control flags, formatted as described below.

The NextFT field contains a pointer to the next forwarding tag (or hash bucket) in the

linked-list of forwarding tags. It is NULL (all-zeros) if this forwarding tag forms the end of

the chain. The MACAddr field spans two consecutive words, and contains the complete

48-bit MAC address associated with this forwarding tag; as in the case of the hash

bucket, the MACAddr field is compared to the address extracted from the Ethernet

packet during the address table lookup process to ensure that the proper forwarding tag

has been found.

The ChipNum field holds the index of the external device corresponding to this

forwarding tag, i.e., the device to which frames directed to this MAC address should be

sent. The ChipNum field is set up when the forwarding tag is inserted into the address

table with the ID of the device requesting that the tag be created.

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