DM8108中文資料etc未分類制造商數(shù)據(jù)手冊PDF規(guī)格書

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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.

Features

■ Low cost Fast Ethernet Switching Controller.

? Provide packet switching functions between eight 10/100Mbps, auto-negotiated on-chip Fast Ethernet ports and a proprietary Full-duplex Expansion port.

? Cascade max. 8 DM8108s without extra glue logic for 64-port configuration.

■ Incorporates three 802.3 compliant 10/100Mbps Media Access Controllers

? Direct interface to MII (Media Independent Interface)

? Half/Full Duplex Support for individual port (upto 200Mbps/port)

? IEEE 802.3 100Base-TX, T4.FX compatible

■ Auto-negotiation supported through Serial MII interface

■ High-performance Distributed Switching Engine

? Performs packet forwarding and filtering at full wire-speed

? 148,800 packets/sec. on each Ethernet port

■ Direct support for packet buffering

? Glue-less interface with 1 or 2 Mbytes of SDRAM (SGRAM)

? 32 bit memory bus configuration

? 66 Mhz – 90Mhz memory bus speed

? Up-to 1.1K buffers, 1536-byte each, allocated to receive ports

■ Support Store and Forward switching approach

? Low last-bit to first-bit out delay

? Allow mixed speed Ethernet packet switching

? Allow conversion between different protocols

■ Flow control

? Support partitioning function

? Support back-pressure while lack of internal resources

? Support 802.3x PAUSE function in full duplex mode

? Support up to 4-port trunking for 800Mbps bandwidth

■ Advanced Address Learning and Searching

? Self learning mechanism

? Cache 128 address entries internally

? Record up-to 16K Uni-cast MAC addresses and unlimited Multicast and Broadcast addresses

? Automatic aging scheme

? Broadcast filtering rate control

■ Expansion Bus

? Up-to 8 SW devices can be cascaded via expansion bus without extra logic

? Full duplex mode transfer

? Less Bus overhead

? Automatic flow control

■ Complete status report to a simple LED interface

■ Suitable for low cost Switch market to replace Hub

■ 0.35
m process, 3.3V with 5V tolerant I/O

■ 208-pin PQFP package