89TTM55x Features

Deterministic performance at 10 Gbps wire-speed (35Mcps)

regardless of the number of flows, traffic size, and patterns.

Up to 256 megabytes of external memory buffer space

(equivalent to a 210ms buffer at 10 Gbps).

Support (Rx and Tx) for industry-standard SPI-4 phase 2,

NPF Streaming Interface, and CSIX over LVDS.

Hierarchical queuing and precise scheduling:

– Traffic management flexibility.

– Support for up to 4K aggregate flow queues (AFQs), 1K port

queues (PQs), 2K arrival reassembly queues (ARQs), and 1K

output queues/channels (OQs) with no external memory

required. Configurable AFQ-to-port assignments.

– Support for up to 1M discrete flows (FLQs), with queuing for

each flow, using external memory. Configurable mapping of

FLQs into aggregate flow queues.

– Two-level FLQ scheduling mode that supports up to 128K or

256K virtual pipe or subscriber queues with up to 8 or 4 CoS

priority queues each.

– Accurate byte-rate shaping at the FLQ, AFQ and port levels.

Multiple levels of buffer congestion management.

– Hierarchical queue structure and thresholding.

– Congestion indication.

– Dynamic adjustment of thresholds during periods of congestion.

– Packet discard (PD).

– Weighted random early discard (WRED).

– Local congestion indication (CI).