LAN89218 datasheet(11/148 Pages) MICROCHIP

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DS60001255B-page 11

LAN89218

TABLE 2-3:

SERIAL EEPROM INTERFACE SIGNALS

Name

Symbol

Buffer Type

# Pins

Description

EEPROM Data,

GPO3, TX_EN,

TX_CLK,

D32/nD16

EEDIO/GPO3/

TX_EN/TX_CLK

(D32/nD16)

I/O8

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 sig-

nals 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 unin-

tentionally access the serial EEPROM. This sig-

nal cannot function as a general-purpose input.

Data Bus Width Select: This signal also func-

tions as a configuration input on power-up and is

used to select the host bus data width. Upon

deassertion of reset, the value of the input is

latched. When high, a 32-bit data bus is utilized.

When low, a 16-bit interface is utilized.

EEPROM Chip

Select

EECS

Serial EEPROM chip select.

EEPROM Clock,

GPO4 RX_DV,

RX_CLK

EECLK/GPO4/

RX_DV/RX_CLK

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 mon-

itor, 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:

This pin must not be pulled low by an

external resistor or driven low exter-

nally under any conditions.

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