Am79C873

The NetPHY-1 Am79C873 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 Am79C873 device uses a low-power, high-performance CMOS process. It contains the entire physical layer  unctions of 100BASE-FX and 100BASE-TX as defined by the IEEE 802.3u standard, including the Physical Coding  ublayer (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.