SMSC LAN9420 User Manual

SMSC LAN9420/LAN9420i

Revision 1.22 (09-25-08) 

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Optimized for embedded applications with 32-bit 

RISC CPUs

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Integrated descriptor based scatter-gather DMA and 

IRQ deassertion timer effectively increase network 
throughput and reduce CPU loading

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Integrated Ethernet MAC with full-duplex support

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Integrated 10/100 Ethernet PHY with HP Auto-MDIX 

support

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32-bit, 33MHz, PCI 3.0 compliant interface

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Reduced power operating modes with PCI Power 

Management Specification 1.1 compliance

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Supports multiple audio & video streams over 

Ethernet

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Cable, satellite, and IP set-top boxes

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Digital televisions

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Digital video recorders

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Home gateways

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Digital media clients/servers

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Industrial automation systems

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Industrial/single board PC

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Kiosk/POS enterprise equipment

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Integrated High-Performance 10/100 Ethernet 

Controller

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Fully compliant with IEEE802.3/802.3u

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Integrated Ethernet MAC and PHY

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10BASE-T and 100BASE-TX support

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Full- and half-duplex support

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Full-duplex flow control

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Preamble generation and removal

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Automatic 32-bit CRC generation and checking

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Automatic payload padding and pad removal

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Loop-back modes

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Flexible address filtering modes

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One 48-bit perfect address

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64 hash-filtered multicast addresses

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Pass all multicast

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Promiscuous mode

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Inverse filtering

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Pass all incoming with status report

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Wakeup packet support

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Integrated 10/100 Ethernet PHY

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Auto-negotiation

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Automatic polarity detection and correction

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Supports HP Auto-MDIX

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Supports energy-detect power down

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Support for 3 status LEDs

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Receive and transmit TCP checksum offload

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PCI Interface

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PCI Local Bus Specification Revision 3.0 compliant

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32-bit/33-MHz PCI bus

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Descriptor based scatter-gather DMA enables zero-
copy drivers

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Comprehensive Power Management Features

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Supports PCI Bus Power Management Interface 
Specification, Revision 1.1

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Supports optional wake from D3cold
(via configuration strap option when Vaux is available)

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Wake on LAN

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Wake on link status change (energy detect)

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Magic packet wakeup

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General Purpose I/O

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3 programmable GPIO pins

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2 GPO pins

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Support for Optional EEPROM

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Serial interface provided for EEPROM

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Used to store PCI and MAC address configuration 
values

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Miscellaneous Features

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Big/Little/Mixed endian support for registers, 
descriptors, and buffers

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IRQ deassertion timer

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General purpose timer

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Single 3.3V Power Supply

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Integrated 1.8V regulator

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Packaging

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Available in 128-pin VTQFP Lead-free RoHS Compliant 
package 

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Environmental

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Available in commercial & industrial temperature ranges