LAN8740 datasheet(12/136 Pages) MICROCHIP

12 / 136 page

LAN8740A/LAN8740Ai

DS00001987A-page 12

 2013-2015 Microchip Technology Inc.

Note 1: Configuration strap values are latched on power-on reset and system reset. Configuration straps are iden-

tified 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" for additional

information.

LED 2

LED2

O12

This pin can be used to indicate link activity, link

speed, nINT, or nPME as configured via the LED2

Function Select field of the Wakeup Control and

Status Register (WUCSR).

Note:

Refer to Section 3.8.1, "LEDs" and Sec-

tion 3.8.4, "Wake on LAN (WoL)" for

additional LED information.

Interrupt Out-

put

nINT

O12

Active low interrupt output.

Note:

By default, the nINT signal is output on

the nINT/TXER/TXD4 pin. The nINT

signal can be optionally configured to

output on the LED1 or LED2 pins. Refer

to Section 3.6, "Interrupt Management"

for additional details on device inter-

rupts.

Power Man-

agement Event

Output

nPME

O12

Active low Power Management Event (PME) out-

put.

Note:

The nPME signal can be optionally con-

figured to output on the LED1, LED2, or

RXD2/nPME/nINTSEL pins. Refer to

Section 3.8.4, "Wake on LAN (WoL)" for

additional nPME and WoL information.

nINT/TXER/

TXD4 Function

Select Configu-

ration Strap

nINTSEL

(PU)

This configuration strap selects the mode of the

nINT/TXER/TXD4 pin.

• When nINTSEL is floated or pulled to VDD2A,

nINT is selected for operation on the

nINT/TXER/TXD4 pin (default).

• When nINTSEL is pulled low to VSS,

TXER/TXD4 is selected for operation on the

nINT/TXER/TXD4 pin.

See Note 1 for more information on configuration

straps.

Note:

Refer to See Section 3.8.1.6, "nINTSEL

and LED2 Polarity Selection" for addi-

tional information.

TABLE 2-2:

LED PINS (CONTINUED)

Num Pins

Name

Symbol

Buffer Type

Description

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