LAN9115 datasheet(10/114 Pages) MICROCHIP

10 / 114 page

LAN9115

DS00002269A-page 10

 2005-2016 Microchip Technology Inc.

TABLE 2-4:

SERIAL EEPROM INTERFACE SIGNALS

Pin No.

Name

Symbol

Buffer

Type

# Pins

Description

EEPROM Data,

GPO3, TX_EN,

TX_CLK

EEDIO/GPO3/

TX_EN/TX_CLK

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 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

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

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 inter-

face

not

used,

the

EECLK pin must be left

unconnected.

TABLE 2-5:

SYSTEM AND POWER SIGNALS

Pin No.

Name

Symbol

Buffer

Type

# Pins

Description

Crystal 1

XTAL1

lclk

External 25MHz Crystal Input.

Can also be connected to single-ended

TTL oscillator. If this method is

implemented, XTAL2 should be left

unconnected.

Crystal 2

XTAL2

Oclk

External 25MHz Crystal output.

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