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Single-Chip/Port 10/100M Fast Ethernet PHYceiver with Auto MDIX
General Description

The RTL8201N is a single-chip/single-port PHYceiver with an MII (Media Independent Interface)/SNI (Serial Network Interface). It implements all 10/100M Ethernet Physical-layer functions including the Physical Coding Sublayer (PCS), Physical Medium Attachment (PMA), Twisted Pair Physical Medium Dependent Sublayer (TP-PMD), with an auto MDIX function, 10Base-Tx Encoder/Decoder, and Twisted-Pair Media Access Unit (TPMAU).

A PECL (Pseudo Emitter Coupled Logic) interface is supported to connect with an external 100Base-FX fiber optical transceiver. The chip utilizes an advanced CMOS process to meet low voltage and low power requirements. With on-chip DSP (Digital Signal Processing) technology, the chip provides excellent performance under all operating conditions.


The Realtek RTL8201N is a Fast Ethernet PHYceiver with selectable MII, RMII, or SNI interface to the MAC chip. It provides the following features:

  • Pin-to-pin compatible with the RTL8211B
  • Supports MII and 7-wire SNI (Serial Network Interface)
  • Supports RMII mode (new RTL8201N function)
  • 10/100Mbps operation
  • Full/half duplex operation
  • Twisted pair or fiber mode output
  • Auto-Negotiation
  • Supports power down mode
  • Supports operation under Link Down Power Saving mode
  • Supports Base Line Wander (BLW) compensation
  • Supports auto MDIX
  • Supports repeater mode
  • Adaptive Equalization
  • Network status LEDs
  • Flow control support
  • 25MHz crystal/oscillator as clock source
  • IEEE 802.3/802.3u compliant
  • Supports IEEE 802.3u clause 28; 1.5V operation with 3.3V IO signal tolerance
  • Low power supply, 1.5V, 1.8V and 3.3V; 1.5V/1.8V is generated by an internal regulator
  • 0.15µm CMOS process
  • 64-pin QFN package
  • Network Interface Adapter
  • MAU (Media Access Unit)
  • CNR (Communication and Network Riser)
  • ACR (Advanced Communication Riser)
  • Ethernet hub
  • Ethernet switch

In addition, it can be used in any embedded system with an Ethernet MAC that needs a UTP physical connection or Fiber PECL interface to an external 100Base‑FX optical transceiver module..


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