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LAN8710AI

Small Footprint MII/RMII 10/100 Ethernet Transceiver with HP Auto-MDIX and flexPWR® Technology

SMSC -> Microchip 

Small Footprint MII/RMII 10/100 Ethernet Transceiver with HP Auto-MDIX and flexPWR® Technology

Datasheet

Chapter 3 Functional Description

This chapter provides functional descriptions of the various device features. These features have been

categorized into the following sections:

„ Transceiver

„ Auto-negotiation

„ HP Auto-MDIX Support

„ MAC Interface

„ Serial Management Interface (SMI)

„ Interrupt Management

„ Configuration Straps

„ Miscellaneous Functions

„ Application Diagrams

3.1

3.1.1

Transceiver

100BASE-TX Transmit

The 100BASE-TX transmit data path is shown in Figure 3.1. Each major block is explained in the

following subsections.

MAC

TX_CLK

(for MII only)

PLL

Ext Ref_CLK (for RMII only)

MII 25 Mhz by 4 bits

or

RMII 50Mhz by 2 bits

MII/RMII

25MHz

by 4 bits

4B/5B

Encoder

25MHz by Scrambler

5 bits and PISO

125 Mbps Serial

NRZI

Converter

NRZI

MLT-3

Converter MLT-3

Tx

Driver

MLT-3 Magnetics MLT-3

RJ45

MLT-3

CAT-5

3.1.1.1

Figure 3.1 100BASE-TX Transmit Data Path

100BASE-TX Transmit Data Across the MII/RMII Interface

For MII, the MAC controller drives the transmit data onto the TXD bus and asserts TXEN to indicate

valid data. The data is latched by the transceiver’s MII block on the rising edge of TXCLK. The data

is in the form of 4-bit wide 25MHz data.

SMSC LAN8710A/LAN8710Ai

19

DATASHEET

Revision 1.4 (08-23-12)

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