DATA SHEE T Am79C875 NetPHY 4LP Low Power Quad 10/100-TX/FX Ethernet Transceiver DISTINCTIVE CHARACTERISTICS Four 10/100BASE-TX Ethernet PHY transceivers Automatic Polarity Detection during Auto- Negotiation and 10BASE-T signal reception Supports RMII (Reduced MII) interface Unique scramble seed per port reduces EMI in 125 meter (m) MLT-3 and Baseline Wander switch and repeater applications operation One port supports 100BASE-FX function Low power consumption Supports Inter Packet Gap as low as 40 ns for 1.3 Watt (W) typical (1:1 magnetics) high throughput applications 1.2 W typical (1.25:1 magnetics) No external filters or chokes required Power management modes: Compliant with IEEE 802.3 standards for Selectable 1:1 or 1.25:1 transmit transformer 100BASE-TX, 100BASE-FX, and 10BASE-T Unplugged - approximately 100 mW per port Built-in loopback and test modes Power Down - approximately 3 mW per port Small 14 x 20 mm 100-pin PQR package Single 3.3 V power supply with 5 V I/O tolerance Small package allows side-by-side PHY layout Patent-pending DC restoration technique reduces baseline wander susceptibility Fits neatly behind quad magnetics Full and half-duplex operation with full-featured Saves board space over larger 208 PQFP Auto-Negotiation function packages Next Page register support Support for Industrial Temperature (-40C to +85C) GENERAL DESCRIPTION The NetPHY 4LP device is a highly integrated, low rectly to the MAC and TX/RX media pins are routed di- power 10BASE-T/100BASE-TX/FX Quad Ethernet rectly to the magnetics. Direct routing of high speed transceiver. The NetPHY 4LP device includes traces is imperative for project system design and EMI integrated RMII, ENDECs, Scrambler/Descrambler, noise reduction. and full-featured Auto-Negotiation with support for Par- The NetPHY 4LP devices on-chip input filtering and allel Detection and Next Page. Port 3 can be config- output waveshaping eliminates the need of external hy- ured as a 100BASE-FX transmitter to output an NRZI brid filters for media connection. Integrated LED logic PECL level signal. Each receiver has an adaptive allows three LEDs per port to be driven directly. These equalizer/DC restoration circuit for accurate clock/data features greatly simplify the design of a 100BASE-X re- recovery on the 100BASE-TX signal at different cable peater/switch board, thus requiring minimum external lengths and can perform to 125 m and beyond. components. The NetPHY 4LP device operates on a 3.3 V supply For ease of system and chip setup and testing, the Net- and offers 5 V I/O tolerance for mixed signal designs. PHY 4LP device offers loopback and various ad- Power consumption is 1.3 W typical for the device, or vanced testing and monitoring capabilities. 0.3 W per port using 1:1 magnetics. The NetPHY 4LP device can use 1.25:1 magnetics, which de- The NetPHY 4LP device is available in the Commer- creases transmit power consumption and reduces de- cial (0C to 70C) or Industrial (-40C to +85C) tem- vice power consumption to 1.2 W typical. perature ranges. The Industrial temperature range is well suited to environment such as enclosures with re- The NetPHY 4LP device offers an optimized pinout stricted air flow or outdoor equipment. for network applications. RMII pins can be routed di- Publication 22236 Rev: I Amendment/0 Issue Date: September 2005 Refer to AMDs Website (www.amd.com) for the latest information.BLOCK DIAGRAM (PER PORT) 100TX PCS PMA TP PMD Framer Clock Recovery MLT-3 TX+ Carrier Detect Link Monitor BLW 4B/5B Signal Detect Stream Cipher 100RX TX- RMII Data 25 MHz Interface Mux Interface 10TX 10BASE-T Transformer 10RX MAC RX+ RX- MDC/MDIO Control/Status 20 MHz RX FLP MII Serial Management PLL Clk Generator Auto- 25 MHz Interface and Registers Test LED Control Negotiation PHYAD 4:0 REFCLK TEST LED 3:0 Drivers 22236G-1 2 Am79C875