LAN8720AI datasheet(12/79 Pages) SMSC

12 / 79 page

Small Footprint RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support

Datasheet

Revision 1.4 (08-23-12)

SMSC LAN8720A/LAN8720Ai

DATASHEET

Note 2.2

Configuration strap values are latched on power-on reset and system reset. Configuration

straps are identified by an underlined symbol name. Signals that function as configuration

straps must be augmented with an external resistor when connected to a load. Refer to

Section 3.7, "Configuration Straps," on page 31 for additional information.

LED 2

LED2

O12

Link Speed LED Indication. This pin is driven

active when the operating speed is 100Mbps. It

is inactive when the operating speed is 10Mbps

or during line isolation.

Note:

Refer to Section 3.8.1, "LEDs," on

page 37 for additional LED information.

nINT/

REFCLKO

Function

Select

Configuration

Strap

nINTSEL

(PU)

This configuration strap selects the mode of the

nINT/REFCLKO pin.

When nINTSEL is floated or pulled to VDD2A,

nINT is selected for operation on the

nINT/REFCLKO pin (default).

When nINTSEL is pulled low to VSS,

REFCLKO is selected for operation on the

nINT/REFCLKO pin.

See Note 2.2 for more information on

configuration straps.

Note:

Refer to See Section 3.8.1.2, "nINTSEL

and LED2 Polarity Selection," on

page 37 for additional information.

Table 2.3 Serial Management Interface (SMI) Pins

NUM PINS

NAME

SYMBOL

BUFFER

TYPE

DESCRIPTION

SMI Data

Input/Output

MDIO

VIS/

VOD8

Serial Management Interface data input/output

SMI Clock

MDC

VIS

Serial Management Interface clock

Table 2.4 Ethernet Pins

NUM PINS

NAME

SYMBOL

BUFFER

TYPE

DESCRIPTION

Ethernet

TX/RX

Positive

Channel 1

TXP

AIO

Transmit/Receive Positive Channel 1

Ethernet

TX/RX

Negative

Channel 1

TXN

AIO

Transmit/Receive Negative Channel 1

Table 2.2 LED Pins (continued)

NUM PINS

NAME

SYMBOL

BUFFER

TYPE

DESCRIPTION

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