LAN9220 datasheet(10/142 Pages) MICROCHIP

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LAN9220

DS00002417A-page 10

 2006-2017 Microchip Technology Inc.

TABLE 2-3:

SERIAL EEPROM INTERFACE SIGNALS

Name

Symbol

Buffer

Type

# Pins

Description

EEPROM Data,

GPO3, TX_EN,

TX_CLK

EEDIO/GPO3/

TX_EN/TX_CLK

VIS/VO8

EEPROM Data: This bi-directional pin can be

connected to a serial EEPROM DIO. This is

optional.

General Purpose Output 3: This pin can also

function as a general purpose output, or it can

be configured to monitor the TX_EN or

TX_CLK signals on the internal MII port. When

configured as a GPO signal, or as a

TX_EN/TX_CLK monitor, the EECS pin is

deasserted so as to never unintentionally

access the serial EEPROM. This signal cannot

function as a general-purpose input.

EEPROM Chip

Select

EECS

VO8

Serial EEPROM chip select.

EEPROM Clock,

GPO4 RX_DV,

RX_CLK

EECLK/GPO4/

RX_DV/RX_CLK

VO8

(PU)

EEPROM Clock: Serial EEPROM Clock pin.

General Purpose Output 4: This pin can also

function as a general-purpose output, or it can

be configured to monitor the RX_DV or

RX_CLK signals on the internal MII port. When

configured as a GPO signal, or as an

RX_DV/RX_CLK monitor, the EECS pin is

deasserted so as to never unintentionally

access the serial EEPROM. This signal cannot

function as a general-purpose input.

Note:

When the EEPROM interface is not

used, the EECLK pin must be left

unconnected.

Note:

When

operating

reduced

VDDVARIO voltage levels (less

than 3.0V), this pin must be pulled-

up with an external resistor. Refer to

Section 2.2, "External Pull-Up/Pull-

Down Resistors" for more informa-

tion.

Note:

This pin must not be pulled low by

an external resistor or driven low

externally under any conditions.

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