描述 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.

特性 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.