DM9131

www.DataSheet4U.com DM9131 10/100 Mbps Fast Ethernet Physical Layer Single Chip Transceiver General Description The DM9131 is a physical-layer, single-chip, lowpower transceiver for 100BASE-TX and 10BASE-T operations. On the media side, it provides a direct interface either to Unshielded Twisted Pair Cable 5 (UTP5) for 100BASE-TX Fast Ethernet, or UTP5/UTP3 Cable for 10BASE-T Ethernet, and it also provides PECL interface to connect the external fiber optical transceiver. Through the Media Independent Interface (MII), the DM9131 connects to the Medium Access Control (MAC) layer, ensuring a high interoperability among products from different vendors. The DM9131 uses a low-power and high-performance CMOS process. It contains the entire physical layer functions of 100BASE-TX as defined by IEEE802.3u, including the Physical Coding Sublayer (PCS), Physical Medium Attachment (PMA), Twisted Pair Physical Medium Dependent Sublayer (TP-PMD), 10BASE-TX Encoder/Decoder (ENC/DEC), and Twisted Pair Media Access Unit (TPMAU). The DM9131 provides a strong support for the autonegotiation function utilizing automatic media speed and protocol selection. Furthermore, due to the builtin wave-shaping filter, the DM9131 needs no external filter to transport signals to the media in 100M or 10M Ethernet operation. Block Diagram 100Base-FX PECL Interface 100Base-TX Transceiver 100BaseTX PCS MII Interface 10Base-T TX/RX Module LED Driver Auto-Negotiation Clock Circuit Block Biasing/ Power Block ...