DESCRIPTION

The PM3350 is a low-cost, highly integrated, stand-alone, single-chip switching device for Ethernet/IEEE 802.3 switching and bridging applications. The device supports all processing required for switching Ethernet/IEEE 802.3 packets between eight independent half-duplex 10 Mbit/s ports. In addition, a switch built around the ELAN 8x10 can be expanded simply by connecting up to 7 additional devices to the on-chip 1 Gbit/s expansion port. Switch configuration and management can be performed either remotely (in-band), via the on-chip SNMP MIB, agent and integrated TCP/UDP/IP stack, or from a local CPU interfaced to the expansion port. The ELAN 8x10 also collects per-port and per-host RMON statistics at wire rates on all ports.

FEATURES

• Single-chip, 8-port 10BaseT Ethernet switch device for low-cost unmanaged and managed networks.

• On-chip 50 MHz RISC CPU processor core, multi-channel DMA controller, MAC-layer interface logic, FIFOs, PCI-based expansion port and a flexible memory controller.

• CPU supports background applications running on local OS (e.g., SNMP or RMON), and real-time data oriented applications (e.g., packet forwarding and filtering decisions).

• Concurrently switches packets between 8 independent half-duplex ports at the full Ethernet rate of 10 Mbit/s.

• Fully compatible with the PM3351 1-port 10/100 Mbit/s switch device; may be used to create a compact and inexpensive mixed 10/100 Mbit/s switch.

• Store-and-forward operation with full error checking and filtering.

• Filtering and switching at wire rates (up to 14,880 packets per second per port), supporting a mix of Ethernet and IEEE 802.3 protocols.

• Performs all address learning, address table management and aging functions for up to 32,768 MAC addresses (limited by external memory) with an address learning rate of up to 10,000 addresses per second.

• Maximum broadcast/multicast rate of 14,880 packets per second per port with configurable broadcast storm rate limiting.

• Low-latency operation in both unicast and broadcast modes.

• Implements the Link Partition function to isolate malfunctioning segments or hosts.

• IEEE 802.1d compliant spanning-tree transparent bridging supported on-chip, with configurable aging time and packet lifetime control.

• On-chip user-enabled backpressure flow control with configurable per-port buffer thresholds and limits.

• Expandable to 64 ports without loss in throughput using multiple PM3350 devices via an on-chip 1 Gbit/s expansion port.

• Expansion port supports a peak system bandwidth of 1 Gbit/s, and is compatible with industry-standard PCI bus (version 2.1).

• Interfaces directly to industry-standard 10BaseT Ethernet Medium Access Unit devices (LXT944 or similar) with no glue logic.

• Configuration, management, MIB statistics and diagnostics available in-band or out-of-band.

• Maintains and collects per-port and per-host statistics at wire rates, allowing a network switch comprised of PM3351 and PM3350 chips to implement RMON statistics (EtherStats and HostStats) using supplied on-chip firmware.

• Fully static CMOS operation at 50 MHz clock rates.

• 3.3 Volt core, 5 Volt compatible I/O

• 256 pin SBGA package.