Released
Datasheet
PM73487 QRT
PMC-Sierra, Inc.
PMC-980618
Issue 3
622 Mbps ATM Traffic Management Device
2.5.2 Receive VC (Channel) Queuing
Receive cells are enqueued on a per-VC (channel) basis. This means that there are up to 16K
queues. Singly-linked lists are used to queue the cells. The head pointers, the tail pointers, and the
linked lists are all in external RAM.
Figure 27, Figure 28, and Figure 29 show the operation of the channel linked list structure.
Per-VC Linked List
Link
Channel
Head
Tail
Link
Link
Figure 27. Channel Linked List
Per-VC Linked List
Link
Link
Channel
Head
Tail
Link
Link
Figure 28. Channel Linked List – a New Cell Arrives
Per-VC Linked List
Channel
Head
Tail
Link
Link
Link
Figure 29. Channel Linked List – a Cell Is Sent to the Fabric
27
PMC [ PMC-SIERRA, INC ]
