PM3351-SW datasheet(83/268 Pages) PMC

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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

Byte

Offset

Flags

NextDD

NumPBs

FirstPB

SrcPort

LastPB

SrcChip

HashBkt

NextDD:

24-bit pointer to next data descriptor in linked-list of data descriptors forming

message queue or transfer ring.

Flags:

8-bit data descriptor flags field, formatted as below.

FirstPB:

24-bit pointer to first packet buffer in linked-list of packet buffers containing

frame or message data. If NULL (zero), no packet buffer chain exists for this

data descriptor; this is only valid for special message data descriptors where

all message data can be contained within the 16-byte descriptor structure

itself.

NumPBs:

8-bit count of packet buffers in chain pointed to by FirstPB. If FirstPB is NULL

(zero), then this field can be used for message-specific purposes.

LastPB:

24-bit pointer to last packet buffer in linked-list of packet buffers pointed to by

FirstPB. If FirstPB is NULL (zero), then this field can be used for message-

specific purposes.

SrcPort:

8-bit source port index within device: indicates the MAC channel upon which

the frame was received. For the ELAN 1x100, this field wil be 0 since the

device only has one port. Only valid if the descriptor points to an Ethernet

frame that was actually received on a MAC channel; otherwise, can be used

for message-specific purposes.

HashBkt:

24-bit pointer to source or destination hash bucket. Only valid for Ethernet

frames; if the descriptor indicates a message, then this field can be used for

message-specific purposes.

SrcChip:

8-bit index of source device that received frame. For the ELAN 1x100 system,

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