DM8108 Datasheet, PDF (1/35 Pages) List of Unclassifed Manufacturers – 8 port 10/100M Fast Ethernet Switching Controller

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 back-
pressure 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 inter-
switch 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
Control &
Status
Address
Learning
Switching
Engine
Expansion
MEM
Controller
LED Control
Unit
Preliminary
1
Version: DM8108-DS-P02
November 25, 1999