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LAN8720AI Datasheet(PDF) 17 Page - SMSC Corporation

Part # LAN8720AI
Description  Small Footprint RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support
PDF  79 Pages
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Manufacturer  SMSC [SMSC Corporation]
Direct Link  http://www.smsc.com
Logo SMSC - SMSC Corporation

LAN8720AI Datasheet(HTML) 17 Page - SMSC Corporation

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Small Footprint RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support
Datasheet
SMSC LAN8720A/LAN8720Ai
17
Revision 1.4 (08-23-12)
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
Transceiver
3.1.1
100BASE-TX Transmit
The 100BASE-TX transmit data path is shown in Figure 3.1. Each major block is explained in the
following subsections.
3.1.1.1
100BASE-TX Transmit Data Across the RMII Interface
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 RMII block on the rising edge of REF_CLK. The data is in the
form of 2-bit wide 50MHz data.
Figure 3.1 100BASE-TX Transmit Data Path
MAC
Tx
Driver
MLT-3
Converter
NRZI
Converter
4B/5B
Encoder
CAT-5
RJ45
25MHz by
5 bits
NRZI
MLT-3
MLT-3
MLT-3
Scrambler
and PISO
RMII
25MHz
by 4 bits
Ext Ref_CLK
PLL
RMII 50Mhz by 2 bits
MLT-3
Magnetics
125 Mbps Serial



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