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Part NameAM79C873 AMD
Advanced Micro Devices AMD
DescriptionNetPHY™ -1 10/100 Mbps Ethernet Physical Layer Single-Chip Transceiver with 100BASE-FX Support
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The NetPHY-1 device is a physical-layer, single-chip, low-power transceiver for 100BASE-TX, 100BASE-FX, and 10BASE-T operations. On the media side, it provides a direct interface to Fiber Media for 100BASE-FX Fast Ethernet, Unshielded Twisted Pair Category 5 Cable (UTP5) for 100BASE-TX Fast Ethernet, or UTP5/UTP3 Cable for 10BASE-T Ethernet. Through the IEEE 802.3u Media Independent Interface (MII), the NetPHY-1 device connects to the Medium Access Control (MAC) layer, ensuring a high interoperability among products from different vendors.
The NetPHY-1 device uses a low-power, high-performance CMOS process. It contains the entire physical layer functions of 100BASE-FX and 100BASE-TX as defined by the IEEE 802.3u standard, including the Physical Coding Sublayer (PCS), Physical Medium Attachment (PMA), 100BASE-TX Twisted Pair Physical Medium Dependent (TP-PMD) sublayer, and a 10BASE-T Encoder/Decoder (ENDEC). The NetPHY-1 device provides strong support for the Auto-Negotiation function utilizing automatic media speed and protocol selection. The NetPHY-1 device incorporates an internal wave-shaping filter to control rise/fall time, eliminating the need for external filtering on the 10/100 Mbps signals.

■ 100BASE-FX direct interface to industry
   standard electrical/optical transceivers
■ 10/100BASE-TX physical-layer, single-chip  transceiver
■ Compliant with the IEEE 802.3u 100BASE-TX  standard
■ Compliant with the ANSI X3T12 TP-PMD 1995  standard
■ Compliant with the IEEE 802.3u Auto
   Negotiation protocol for automatic link type  selection
■ Supports the MII with serial management  interface
■ Supports Full Duplex operation for 10 Mbps and  100 Mbps
■ High performance 100 Mbps clock generator
   and data recovery circuitry
■ Adaptive equalization circuitry for 100 Mbps  receiver
■ Controlled output edge rates in 100 Mbps
■ Supports a 10BASE-T interface without the
   need for an external filter
■ Provides Loopback mode for system  diagnostics
■ Includes flexible LED configuration capability
■ Digital clock recovery circuit using advanced
   digital algorithm to reduce jitter
■ Low-power, high-performance CMOS process
■ Available in  a 100-pin PQFP package

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