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| Switching Solutions PresteraTM-DX81/DX161/DX241 8/16/24-Port GbE Packet Processor 98DX81/98DX161/98DX241 The Marvell Prestera-DX family of packet processors offers new levels of integration and performance targeted at desktop Gigabit Ethernet (GbE) switches in Small-to-Medium Size Business (SMB) networks. The Prestera-DX GbE packet processors are available in 8-port (98DX81), 16-port (98DX161) and 24-port (98DX241) congurations, integrating Gigabit MACs with embedded buffer memory and integrated SERDES in each port. It is a complete System-On-Chip (SOC) solution that supports full-wire-speed switching performance with advanced Quality of Service (QoS) features including IEEE 802.1p, DiffServ and four priority levels per port. Addressing the costsensitive unmanaged desktop switching market, the Prestera-DX81/DX161/DX241 devices enable system vendors to design affordable, plug-and-play, high-density, small form factor standalone switches. Enqueue Egress Control Pipe Transmit Queues Forwarding Database VID and MAC Group Table TxQ Memory DMAs Port Port Port Port Port MAC MAC MAC MAC MAC Port Port Port Port Port SERDES SERDES SERDES SERDES SERDES 24 Network Ports with Integrated SERDES Port MAC Port SERDES Ingress Control Pipe TWSI Controller Buffer Management Buffers Memory PRODUCT OVERVIEW Fig 1. Prestera Packet Processor (98DX81/98DX161/98DX241) Block Diagram FEATURES Eight, sixteen and twenty-four 10/100/1000 Mbps Ethernet ports with MGMII interface 4K Media Access Control (MAC) addresses Integrated on-chip buffer memory and SERDES on all GbE ports Supports manual or Auto-Negotiation setting for speed, duplex and 802.3x ow control Four priority queues per port Priority assignment per 802.1p tag, Port or DiffServ Code Point (DSCP) eld Weighted round robin and strict priority Multicast/broadcast rate limiting Ease-of-design Only two voltage supplies: 1.2V and 2.5V Single 25 MHz external clock reference Built-in diagnostics: CRC checker, packet counters and pattern generator LED interface for ports link status and system debug BENEFITS Enables high-density, small form factor GbE switching solutions Provides large MAC table for desktop applications Simplies PCB design and layout Provides exible and reliable control on packet transaction Provides differentiated level of support Meets QoS requirement in SMB network environment Ensure reliable transmission of high-priority trafc for delay-sensitive or critical applications Provides network security Enables unprecedented ease in PCB design, board bring-up and design debug PresteraTM-DX81/DX161/DX241 GbE Packet Processor FEATURES BENEFITS Two-wire interface for EEPROM initialization Low power: 1.5W (98DX81), 4W (98DX161/98DX241) max. 128 LQFP, 20mm x 14mm (98DX81) 480 SBGA, 31mm x 31mm (98DX161/98DX241) APPLICATIONS Allows for easy system conguration Enables low system cost Provides cost-effective package The Prestera-DX81/DX161/DX241 GbE packet processors deliver the optimal desktop switching solution for the SMB market. The Prestera-DX241 device enables cost-effective, plug-and-play, high-port density standalone desktop switches, accelerating the market transition from Fast Ethernet to Gigabit Ethernet. The Prestera-DX family provides a complete line of GbE switching solutions. To shorten system manufacturersO design cycle and accelerate time-to-market, Marvell provides complete Prestera-DX development platforms and reference designs with schematics and layout files. Prestera Packet Processor (98DX81/98DX161/98DX241) MGMII MGMII MGMII MGMII MGMII Alaska Quad PHY (88E1145) Alaska Quad PHY (88E1145) Alaska Quad PHY (88E1145) Alaska Quad PHY (88E1145) Alaska Quad PHY (88E1145) Fig 2. Prestera GbE Unmanaged Desktop Switching Solutions (98DX81, 98DX161, 98DX241) Diagram The Marvell Prestera-DX81/DX161/DX241 GbE packet processors come with a complete set of hardware and software development tools to assist network hardware engineers with product evaluation. MarvellOs worldwide eld applications engineers collaborate closely with network equipment vendors to develop and deliver new competitive products to market on time. Marvell utilizes recognized world-leading semiconductor foundry and packaging services to reliably deliver high-volume and low cost total solutions. THE MARVELL ADVANTAGE: For more information, visit our website at www.marvell.com. Marvell Semiconductor, Inc. 700 First Avenue Sunnyvale, CA 94089 Phone 408.222.2500 www.marvell.com Copyright (c) 2003. Marvell. All rights reserved. Marvell, the Marvell logo, Moving Forward Faster, Alaska, and GalNet are registered trademarks of Marvell. Discovery, Fastwriter, GalTis, Horizon, Libertas, Link Street, NetGX, PHY Advantage, Prestera, Raising The Technology Bar, UniMAC, Virtual Cable Tester, and Yukon are trademarks of Marvell. All other trademarks are the property of their respective owners. 98DX81/98DX161/98DX241-001 04/03 Alaska Quad PHY (88E1145) MGMII |
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