LAN89218 datasheet(12/148 Pages) MICROCHIP

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LAN89218

DS60001255B-page 12

 2008-2015 Microchip Technology Inc.

TABLE 2-4:

SYSTEM AND POWER SIGNALS

Name

Symbol

Buffer Type

# Pins

Description

Crystal 1, Clock In

XTAL1/CLKIN

ICLK

External 25 MHz Crystal Input. This pin can also

be connected to single-ended TTL oscillator

(CLKIN). If this method is implemented, XTAL2

should be left unconnected.

Crystal 2

XTAL2

OCLK

External 25 MHz Crystal output.

Reset

nRESET

(PU)

Active-low reset input. Resets all logic and regis-

ters within the LAN89218. This signal is pulled

high with a weak internal pull-up resistor.

Note:

The LAN89218 must always be read

at least once after power-up, reset, or

upon return from a power-saving state

or write operations will not function.

See Section 3.11 for additional infor-

mation

Wakeup Indicator

PME

O8/OD8

When programmed to do so, is asserted when the

LAN89218 detects a wake event and is request-

ing the system to wake up from the associated

sleep state. The polarity and buffer type of this

signal is programmable.

Note:

Detection of a Power Management

Event, and assertion of the PME sig-

nal will not wakeup the LAN89218.

The LAN89218 will only wake up

when it detects a host write cycle

(assertion of nCS and nWR). Although

any write to the LAN89218, regardless

of the data written, will wake-up the

device when it is in a power-saving

mode,

required

that

the

BYTE_TEST register be used for this

purpose.

Auto-MDIX

Enable

AMDIX_EN

(PD)

Enables Auto-MDIX. Pull high to enable Auto-

MDIX, pull low or leave unconnected to disable

Auto-MDIX.

10/100 Selector

SPEED_SEL

(PU)

This signal functions as a configuration input on

power-up and is used to select the default Ether-

net settings. Upon deassertion of reset, the value

of the input is latched. This signal functions as

shown in Table 2-5 below.

No Connect

No Connect. These pins must be left open.

Pull-Down

(Reserved)

(PD)

Reserved for internal purposes only. This pin

should be pulled low through an external pull-

down resistor or left unconnected.

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