LAN89730 datasheet(17/218 Pages) MICROCHIP

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 2013-2015 Microchip Technology Inc.

DS60001348A-page 17

LAN89730

Note 2-1

Configuration strap values are latched on Power on Reset (POR) or External Chip Reset (nRESET).

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

straps must be augmented with an external resistor when connected to a load. Refer to Section 4.14,

"Configuration Straps" for additional information.

TABLE 2-2:

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 Con-

figuration

Strap

AUTOMDIX_EN

(PU)

Determines the default Auto-MDIX setting.

0 = Auto-MDIX is disabled.

1 = Auto-MDIX is enabled.

See Note 2-1 for more information on configura-

tion straps.

EEPROM

Chip Select

EECS

This pin drives the chip select output of the exter-

nal EEPROM.

Note:

The EECS output may tri-state briefly

during power-up. Some EEPROM

devices may be prone to false selection

during this time. When an EEPROM is

used, an external pull-down resistor is

recommended on this signal to prevent

false selection. Refer to your EEPROM

manufacturer’s datasheet for additional

information.

EEPROM

Clock

EECLK

(PD)

This pin drives the EEPROM clock of the external

EEPROM.

Note:

This pin must be pulled-up externally for

proper operation.

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