MDS212

• 12 10/100Mbps Autosensing, Fast Ethernet ports with Reduced MII Interface
• 32-bit wide bi-directional pipe at 100Mhz provides 6.4Gbps pipe to connect two MDS212 chips
• Supports up to 3.572 Mpps system throughput using non-blocking architecture
• High performance Layer 2 packet forwarding and filtering at full wire speed.
• Very low latency through single store and forward at ingress port and cut-through switching at destination ports
• Port Trunking and Load Sharing for high bandwidth links between switches
• On-chip address lookup engine and memory for up to 2K MAC addresses
• up to 64K using management CPU memory
• Supports up to 4k MAC addresses with 24 ports (2-chip solution)
• Up to 16K using external buffer memory
• Parallel Flash interface for fast self initialization
• Supports packet filtering and port security
• System wide filtering
• Static MAC destination and source address filtering
• VLAN for multicast/broadcast filtering
• Protocol filtering
• Local port filtering
• Aging control for secure MAC addresses
• Provides 256-port and ID Tagged Virtual LANs (VLANs) 802.1Q
• ID Tagging Insertion/Extraction
• Supports IP Multicasting through IGMP Snooping
• XpressFlow Quality of Service (QoS), IEEE 802.1p, supports 4 Level transmission priorities, weighted fair queuing based packet scheduling, user mapping of priority levels and weights
• Full duplex Ethernet IEEE 803.2x flow control minimizes traffic congestion
• Supports back-pressure flow control for half duplex mode
• Flooding and Broadcasting control
• Link status and TX/RX activity through serial LED interface
• Standard software modules available:
• Browser, GUI, and text menu
• IEEE 802.1d Spanning Tree Algorithm
• SNMP management
• Telnet for remote control console
• Automatic Booting via TFTP Protocols.
• Remote Monitoring (RMON) and storage for a management agent
• IGMP for IP multicast
• GVRP, GMRP
• Packaged in 456-Pin Ball Grid Array

The MDS212 is a 12-port 10/100Mbps high-performance, non-blocking Ethernet switch with on-chip address
memory and address lookup engine. A single chip provides 12 - 10/100Mbps ports. The MDS212 can be utilized in
both managed and unmanaged switching applications.

The 3.2 Gbps XPipe allows a high-speed connection between two MDS212 chips, providing a optimal, low-cost,
workgroup witch with 24 10/100 Fast Ethernet ports.In half-duplex mode, all ports support back pressure flow control to minimize the risk of losing data for long activity bursts. In full-duplex mode, IEEE 802.3x frame based flow control is used. With full-duplex capabilities, the Fast Ethernet ports supports 200Mbps aggregate bandwidth connections.

The MDS212 supports port trunking/load sharing on the 10/100Mbps ports. Port trunking/load sharing can be used
to group ports between interlinked switches for increased system bandwidth. Ports within a trunk must reside within
a single MDS212, such that trunks may not be configured across two switches.

The on-chip address lookup engine supports up to 2K MAC addresses and up to 256 IEEE 802.1Q Virtual LANs
(VLAN). Each port may be programmed to recognize VLANs, and will transmit frames along with their VLAN Tags,
for interoperability, to systems that support VLAN Tagging.Each port independently collects statistical information using SNMP and the Remote Monitoring Management Information Base (RMON MIB). Access to these statistical counter/registers are provided via the CPU interface. SNMP Management frames may be received and/or transmitted via the CPU interface and thus creates a complete network management solution. The MDS212 utilizes cost effective, high performance, pipelined SBRAM to achieve full wire speed on all ports simultaneously. Data is buffered into memory, using 0-128 byte bursts, from the ingress ports, and transferred to an internal transmit FIFO, before being sent from the frame memory to the egress output ports. Extremely high memory bandwidth is therefore achieved, which allows each of the ports to be active without creating a memory bottleneck.

The MDS212 is fabricated with 2.5 V technology, where the inputs are 3.3V tolerant and the outputs are capable of directly interfacing to Low-Voltage TTL levels. The MDS212 is packaged in a 456-pin Ball Grid Array.