LAN8741AI-EN datasheet(10/106 Pages) MICROCHIP

10 / 106 page

LAN8741A/LAN8741Ai

DS00001988A-page 10

 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.

Carrier Sense

(MII Mode)

CRS

VO8

(PD)

This signal indicates detection of a carrier in MII

mode.

TABLE 2-2:

LED PINS

Num Pins

Name

Symbol

Buffer Type

Description

LED 1

LED1

O12

Link activity LED indication. This pin is driven active

when a valid link is detected and blinks when activ-

ity is detected.

Note:

Refer to Section 3.8.1, "LEDs" for addi-

tional LED information.

Regulator Off

Configuration

Strap

REGOFF

(PD)

This configuration strap is used to disable the inter-

nal 1.2 V regulator. When the regulator is disabled,

external 1.2 V must be supplied to VDDCR.

• When REGOFF is pulled high to VDD2A with

an external resistor, the internal regulator is

disabled.

• When REGOFF is floating or pulled low, the

internal regulator is enabled (default).

See Note 1 for more information on configuration

straps.

Note:

Refer to Section 3.7.4, "REGOFF: Inter-

nal +1.2 V Regulator Configuration" for

additional details.

LED 2

LED2

O12

Link speed LED indication. This pin is driven active

when the operating speed is 100 Mbps. It is

inactive when the operating speed is 10 Mbps or

during line isolation.

Note:

Refer to Section 3.8.1, "LEDs" for addi-

tional LED 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 3.8.1.2, "nINTSEL

and LED2 Polarity Selection" for addi-

tional information.

TABLE 2-1:

MII/RMII SIGNALS (CONTINUED)

Num Pins

Name

Symbol

Buffer Type

Description

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