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-DX81/DX161/DX241
8/16/24-Port GbE Packet Processor
98DX81/98DX161/98DX241
The Marvell
篓
Prestera
陋
-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) con脼gurations,
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 cost-
sensitive 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陋 Packet Processor (98DX81/98DX161/98DX241) Block Diagram
FEATURES
楼
Eight, sixteen and twenty-four 10/100/1000 Mbps Ethernet ports
with MGMII interface
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4K Media Access Control (MAC) addresses
楼
Integrated on-chip buffer memory and SERDES on all GbE ports
楼
Supports manual or Auto-Negotiation setting for speed, duplex
and 802.3x 脽ow control
楼
Four priority queues per port
楼
Priority assignment per 802.1p tag, Port or DiffServ Code
Point (DSCP) 脼eld
楼
Weighted round robin and strict priority
楼
Multicast/broadcast rate limiting
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Ease-of-design
脨 Only two voltage supplies: 1.2V and 2.5V
脨 Single 25 MHz external clock reference
脨 Built-in diagnostics: CRC checker, packet counters and
pattern generator
脨 LED interface for ports link status and system debug
BENEFITS
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Enables high-density, small form factor GbE switching solutions
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Provides large MAC table for desktop applications
楼
Simpli脼es PCB design and layout
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Provides 脽exible and reliable control on packet transaction
楼
Provides differentiated level of support
楼
Meets QoS requirement in SMB network environment
楼
Ensure reliable transmission of high-priority traf脼c for delay-sensitive
or critical applications
楼
Provides network security
楼
Enables unprecedented ease in PCB design, board bring-up and
design debug
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