LAN9303 datasheet(35/366 Pages) SMSC

35 / 366 page

Small Form Factor Three Port 10/100 Managed Ethernet Switch with Single MII/RMII/Turbo MII

Datasheet

SMSC LAN9303/LAN9303i

Revision 1.3 (08-27-09)

DATASHEET

LED 2

LED2

O12/

OD12/

OS12

This pin is configured to operate as an LED when

the LED 2 Enable bit in the LED Configuration

depends on the setting of the LED Function 1-0

(LED_FUN[1:0]) field in the LED Configuration

an push-pull or open-drain/open-source output.

When selected as an open-drain/open-source

output, the polarity of this pin depends up the

E2PSIZE_LED2P strap value sampled at reset.

GPIO 2

GPIO2

IS/O12/

OD12

(PU)

This pin is configured to operate as a GPIO when

the LED 2 Enable bit of the LED Configuration

programmable as either a push-pull output, an

open-drain output, or a Schmitt-triggered input by

writing the General Purpose I/O Configuration

I/O Data & Direction Register (GPIO_DATA_DIR).

EEPROM Size

and

LED 2 Polarity

Configuration

Strap

E2PSIZE_LED2P

(PU)

This strap configures the EEPROM size, as well as

the polarity of the LED 2 pin when it is an open-

drain or open-source output. See Note 3.6.

The low bit of the EEPROM size range is set to the

strap value. When 0, EEPROM sizes 16 x 8

through 2048 x 8 are supported. When 1,

EEPROM sizes 4096 x 8 through 65536 x 8 are

supported.

For LED 2, If the strap value is 0:

The LED is set as active high, since it is assumed

that a LED to ground is used as the pull-down.

If the strap value is 1:

The LED is set as active low, since it is assumed

that a LED to VDD is used as the pull-up.

Table 3.5 GPIO/LED/Configuration Straps (continued)

NUM

PINS

NAME

SYMBOL

BUFFER

TYPE

DESCRIPTION

LAN9303 Datasheet(PDF) 35 Page - SMSC Corporation

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