LAN9500AI datasheet(16/66 Pages) SMSC

16 / 66 page

USB 2.0 to 10/100 Ethernet Controller

Datasheet

Revision 1.1 (04-18-13)

SMSC LAN950x Family

DATASHEET

Note 3.1

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.

Transmit Data

(External

PHY Mode)

TXD0

(PD)

In external PHY mode, this pin functions as the

transmit data 0 output to the external PHY.

General

Purpose I/O 4

(Internal PHY

Mode Only)

GPIO4

IS/O8/

OD8

(PU)

This General Purpose I/O pin is fully

programmable as either a push-pull output, an

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

EEPROM

Disable

Configuration

Strap

EEP_DISABLE

(PD)

This strap disables the autoloading of the

EEPROM contents. The assertion of this strap

does not prevent register access to the

EEPROM.

0 = EEPROM is recognized if present.

1 = EEPROM is not recognized even if it is

present.

See Note 3.1 for more information on

configuration straps.

Transmit

Clock

(External

PHY Mode)

TXCLK

(PU)

In external PHY mode, this pin is the transmitter

clock input from the external PHY. In internal

PHY mode, this pin is not used.

Table 3.2 EEPROM Pins

NUM PINS

NAME

SYMBOL

BUFFER

TYPE

DESCRIPTION

EEPROM

Data In

EEDI

(PD)

This pin is driven by the EEDO output of the

external EEPROM.

EEPROM

Data Out

EEDO

(PU)

This pin drives the EEDI input of the external

EEPROM.

Auto-MDIX

Enable

Configuration

Strap

AUTOMDIX_EN

(PU)

Determines the default Auto-MDIX setting.

0 = Auto-MDIX is disabled.

1 = Auto-MDIX is enabled.

See Note 3.2 for more information on

configuration straps.

Table 3.1 MII Interface Pins (continued)

NUM PINS

NAME

SYMBOL

BUFFER

TYPE

DESCRIPTION

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