LAN8187 datasheet(8/72 Pages) SMSC

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±15kV ESD Protected MII/RMII Fast-Ethernet PHY with HP Auto-MDIX and SMSC flexPWRTM

Datasheet

SMSC LAN8187/LAN8187I

Revision 1.0 (12-14-06)

DATASHEET

Chapter 1 General Description

The SMSC LAN8187/LAN8187I is a low-power, industrial temperature (LAN8187I), variable I/O

voltage, analog interface IC with HP Auto-MDIX for high-performance embedded Ethernet applications.

The LAN8187/LAN8187I can be configured to operate on a single 3.3V supply utilizing an integrated

3.3V to 1.8V linear regulator. An option is available to disable the linear regulator to optimize system

designs that have a 1.8V power plane available.

1.1

Architectural Overview

The LAN8187/LAN8187I consists of an encoder/decoder, scrambler/descrambler, wave-shaping

transmitter, output driver, twisted-pair receiver with adaptive equalizer and baseline wander (BLW)

correction, and clock and data recovery functions. The LAN8187/LAN8187I can be configured to

support either the Media Independent Interface (MII) or the Reduced Media Independent Interface

(RMII).

The LAN8187/LAN8187I is compliant with IEEE 802.3-2005 standards (MII Pins tolerant to 3.6V) and

supports both IEEE 802.3-2005 -compliant and vendor-specific register functions. It contains a full-

duplex 10-BASE-T/100BASE-TX transceiver and supports 10-Mbps (10BASE-T) operation on

Category 3 and Category 5 unshielded twisted-pair cable, and 100-Mbps (100BASE-TX) operation on

Category 5 unshielded twisted-pair cable.

Figure 1.1 LAN8187/LAN8187I System Block Diagram

Hubs and switches with multiple integrated MACs and external PHYs can have a large pin count due

to the high number of pins needed for each MII interface. An increasing pin count causes increasing

cost.

The RMII interface is intended for use on Switch based ASICs or other embedded solutions requiring

minimal pincount for ethernet connectivity. RMII requires only 6 pins for each MAC to PHY interface

plus one common reference clock. The MII requires 16 pins for each MAC to PHY interface.

The SMSC LAN8187/LAN8187I is capable of running in RMII mode. Please refer to the RMII

consortium for more information on the RMII standard http://www.rmii-consort.com.

The LAN8187/LAN8187I referenced throughout this document applies to both the commercial

temperature and industrial temperature components. The LAN8187I refers to only the industrial

temperature component.

10/100

Media

Access

Controller

(MAC)

or SOC

SMSC

LAN8187/

LAN8187I

Magnetics

Ethernet

System Bus

LEDS/GPIO

25 MHz (MII) or 50MHz (RMIII)

Crystal or External Clock

MII /RMII

LAN8187 Datasheet(PDF) 8 Page - SMSC Corporation

LAN8187 Datasheet(HTML) 8 Page - SMSC Corporation

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