DP83840A

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DP83840A Features

• IEEE 802.3 10BASE-T compatible--ENDEC and UTP/STP transceivers and filters built-in
• IEEE 802.3u 100BASE-X compatible--support for 2 pair Category 5 UTP (100m), Type 1 STP and Fiber Optic Transceivers--Connects directly to the DP83223 Twisted Pair Transceiver
• ANSI X3T12 TP-PMD compatible
• IEEE 802.3u Auto-Negotiation for automatic speed selection
• IEEE 802.3u compatible Media Independent Interface (MII) with Serial Management Interface
• Integrated high performance 100 Mb/s clock recovery circuitry requiring no external filters
• Full Duplex support for 10 and 100 Mb/s
• MII Serial 10 Mb/s output mode
• Fully configurable node and repeater modes--allows operation in either application
• Programmable loopback modes for easy system diagnostics
• Flexible LED support
• IEEE 1149.1 Standard Test Access Port and Boundary-Scan compatible
• Small footprint 100-pin PQFP package
• Individualized scrambler seed for multi-PHY applications

DP83840A Description

The DP83840A is a Physical Layer device for Ethernet 10BASE-T and 100BASE-X using category 5 Unshielded, Type 1 Shielded and Fiber Optic cables.

This VLSI device is designed for easy implementation of 10/100 Mb/s Ethernet LANs. It interfaces to the PMD sub-layer through National Semiconductor's DP83223 Twisted Pair Transceiver, and to the MAC layer through a Media Independent Interface (MII), ensuring interoperability between products from different vendors.

The DP83840A is designed with National Semiconductor's BiCMOS process. Its system architecture is based on the integration of several of National Semiconductor's industry proven core technologies:

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