This document describes an obsolete product, which is a highly integrated central switch controller. It adopts advanced 0.35 micron 3.3 Volt CMOS process and comes in a 256-PIN PQFP package. It supports various operating frequencies and features a 16-bit external CAM interface and a 32-bit Control Buffer Memory interface. It also includes hardware-assisted buffer and queue management to minimize CPU overhead.
The SC220 XpressFlow Engine is a highly integrated central switch controller built on a 0.35 µm 3.3 V CMOS process. It offers a 256‑pin PQFP package, supports operating frequencies up to 66 MHz, and delivers switching bandwidths up to 2.10 Gbps. The engine includes a 16‑bit external CAM interface, 32‑bit management bus, and hardware‑assisted queue management for efficient packet handling, supporting unicast, multicast, and broadcast frames.
The handbook details the pin assignments, bus interfaces (XpressFlow Bus, Management Bus, CAM Interface, Local Memory Bus), power pins, and connection diagram for the SC220. It also lists supported features such as up to 8 multi‑port network access controllers, VLAN classification for up to 62 groups, and configurable firmware for easy upgrades.
| Switching bandwidth | 2.10 Gbps @ 66.67 MHz |
|---|---|
| Package type | 256‑PIN PQFP |
| Supported MAC address range | 1 % to 16 k MAC addresses |
| Memory interface capacity | 128 kB to 1 MB |
| Maximum Multi‑port Network Access Controllers | 8 |
| VLAN groups supported | up to 62 |
The SC220 supports up to eight Multi‑port Network Access Controllers.
The SC220 is supplied in a 256‑pin PQFP package.