The XTF-821 is a 10BASE-Te, 100BASE-TX, 1000BASE-T and 2.5GBASE-T transceiver highly integrated into a single monolithic CMOS chip, and is compatible with both the IEEE 802.3 standard and the NBASE-T Alliance PHY. It performs all the necessary physical layer functions for 10BASE-Te, 100BASE-TX, 1000BASE-T and 2.5GBASE-T ethernet over CAT.5e UTP cable.

The XTF-821 uses advanced DSP technology and an Analog Front End to enable high-speed data transmission and reception over UTP cable. It is a highly integrated solution combining digital adaptive equalizers, ADCs, line driver, echo cancellers, crosstalk cancellers, phase-locked loops and so on. Functions such as Crossover Detection & Auto-Correction, polarity correction are also supported.

Data transfer between MAC and XTF-821 is by the SERDES interface which can be configured as SGMII and 2500BASE-X. XTF-821 operates at multiple digital I/O voltages, including 3.3V and 1.8V.

·  Compatible with IEEE 802.3, IEEE 802.3u, IEEE 802.3ab

·  Supports IEEE 802.3az (Energy Efficient Ethernet)

·  Supports IEEE 802.3bz(2.5GBASE-T)

·  Supports Full Duplex flow control (IEEE 802.3x)

·  Supports IEEE 802.3 optional ability(Fast Retrain)

·  Integrated 10BASE-Te, 100BASE-TX, 1000BASE-T and 2.5GBASE-T IEEE 802.3 Compliant transceiver

·  Auto-Negotiation with extended next page capability(XNP)

·  Compatible with NBASE-T Alliance PHY Specification

·  Supports pair swap/polarity/skew correction

·  Crossover detection and auto-correction

·  Configurable MDI port ordering(MDI swap) for easy PCB layout

·  Supports power down/link down power saving mode

·  Supports clause 22 and clause 45 MDC/MDIO management interface

·  Supports rate adaptor for SERDES

·  Selectable SERDES interface to MAC control(SGMII /2500BASE-X)

·  Built-in Wake-on-LAN(WOL) over UTP

·  Supports Interrupt function over UTP

·  Supports parallel detection

·  Baseline Wander Correction

·  Supports 3.3/1.8V signaling for MDIO access

·  Supports 25MHz crystal or external OSC

·  Provides 25MHz clock source for MAC

·  Provides 3 network customized LEDs with controllable LED Blinking Frequency and Duty Cycle

·  Self-Loopback diagnostic capability

·  Supports SPI Flash