DM8108

www.DataSheet4U.com DM8108 8 port 10/100M Fast Ethernet Switching Controller General Description The DM8108 is an 8 port 10/100Mbit/s nonblocking Ethernet switch with on-chip address-lookup engine. The DM8108 provides a low-cost, high-performance switch solution with PHYs and single SGRAM. The DM8108 provides eight 10/100Mbit/s Fast Ethernet interface. In half-duplex mode, all ports support backpressure capability to reduce the risk of data loss for a long burst of activity. In the full-duplex mode of operation, the device uses IEEE std. 802.3 frame-based pause protocol for flow control. With full-duplex capability, port 0 – 7 support 1.6Gbit/s aggregate bandwidth connections. The DM8108 also supports port trunking/load balancing on the 10/100Mbit ports. This can be used to group ports on interswitch links to increase the effective bandwidth between the systems. The internal address-lookup engine supports up to 16.25K unicast and unlimited multicast and broadcast addresses. This engine performs destination and source addresses book-keeping and comparison which also forwards unknown destination address packets to all ports. The DM8108 is fabricated with a .35um technology. Working at 3.3V, the inputs are 5V tolerant and the outputs are capable of directly driving at TTL levels. Block Diagram www.DataSheet4U.com Address Learning Expansion MEM Controller LED Control Unit Switching Engine Control & Status Preliminary Version: DM8108-DS-P02 November 25, 1999 1 www.DataSheet...