Description The DNC3X3625 is a twisted-pair transceiver macrocell that supports transmission and reception over category 3 unshielded twisted-pair (UTP) cable and category 5 UTP. The DNC3X3625 has been designed specifically for applications that support both 10Base-T and 100Base-X, such as network interface cards (NICs), switches. Features General ■ Ports individually configurable ■ Autonegotiation and management: — Fast link pulse (FLP) burst generator. — Arbitration function. — Accepts preamble suppression. — Operates up to 12.5 MHz. ■ Supports the MII station management protocol and frame format (clause 22): basic and extended register set. ■ Supports next page. ■ Provides status signals: receive activity, transmit activity, full duplex, collision/jabber, link integrity, and speed indication. ■ Powerdown mode for 10 Mbits/s and 100 Mbits/s operation. ■ Loopback testing for 10 Mbits/s and 100 Mbits/s operation. ■ 0.25 µm low-power CMOS technology. ■ Single 3.3 V power supply operation. ■ 25 MHz XTAL oscillator input or 25 MHz/50 MHz/ 125 MHz clock input. ■ Compatible with RMII (standard version) and SMII (standard version). Hex 10 Mbits/s Transceiver ■ DSP based. ■ Compatible with IEEE * 802.3 10Base-T standard for twisted-pair cable. ■ Half- and full-duplex operations. ■ Autopolarity detection and correction. ■ Adjustable squelch level for extended wire-length capability (two levels). ■ Interfaces with IEEE 802.3u media independent interface (MII) or a serial 10 Mbits/s 7-pin interface. ■ On-chip filtering eliminates the need for external filters. Hex 100 Mbits/s Transceiver ■ Compatible with IEEE 802.3u MII (clause 22), PCS/PMA (clause 24), PMD (clause 25), MII management, and autonegotiation (clause 28) specifications. ■ Selectable 5-bit code-group (PDT/PDR interface) or 4-bit data nibbles (MII interface) input/output. ■ Full- or half-duplex operations. ■ Optional carrier integrity monitor (CIM). ■ Selectable carrier sense signal generation (MCRS) asserted during either transmission or reception in half duplex (MCRS asserted during reception only in full duplex). ■ Adaptive equalization and baseline wander correction. ■ On-chip filtering eliminates the need for external filters. Hex 100 Mbits/s FX Transceiver ■ Compatible with IEEE 802.3u 100Base-FX standard. ■ Reuses existing twisted-pair I/O pins for compatible fiber-optic transceiver pseudo-ECL (PECL) data. ■ Fiber mode automatically configures port: — FX mode enable is pin or register selectable — Disables autonegotiation and 10Base-T. — Enables 100Base-FX remote fault signaling. — Disables MLT-3 encoder/decoder. — Disables scrambler/descrambler.
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