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).