LAN9220 View Datasheet(PDF) - SMSC -> Microchip

Part Name

Description

Manufacturer

LAN9220

16-bit Non-PCI Small Form Factor 10/100 Ethernet Controller with Variable Voltage I/O & HP Auto-MDIX Support

SMSC -> Microchip 

16-bit Non-PCI Small Form Factor 10/100 Ethernet Controller with Variable Voltage I/O & HP Auto-MDIX Support

Datasheet

NAME

Crystal 1, Clock In

Crystal 2

Reset

Table 2.4 System and Power Signals

SYMBOL

XTAL1/CLKIN

XTAL2

nRESET

BUFFER

TYPE

lCLK

OCLK

VIS

(PU)

NUM

PINS

1

1

1

DESCRIPTION

External 25MHz Crystal Input. This pin can also

be connected to single-ended TTL oscillator

(CLKIN). If this method is implemented, XTAL2

should be left unconnected.

External 25MHz Crystal output.

Active-low reset input. Resets all logic and

registers within the LAN9220. This signal is

pulled high with a weak internal pull-up resistor.

Note:

The LAN9220 must be reset on

power-up via nRESET or following

power-up via a soft reset (SRST). The

LAN9220 must always be read at least

once after reset, or upon return from a

power-saving state or write operations

will not function. See Section 3.11,

"Detailed Reset Description," on

page 47 for additional information

Note:

When operating at reduced

VDDVARIO voltage levels (less than

3.0V), this pin must be pulled-high to

a valid level with an external resistor

or must be driven as an input. Refer to

Section 2.2, "External Pull-Up/Pull-

Down Resistors" for more information.

Wakeup Indicator

PME

VO8/

VOD8

Auto-MDIX Enable

AMDIX_EN

VIS

(PU)

1

When programmed to do so, is asserted when

the LAN9220 detects a wake event and is

requesting 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

signal will not wakeup the LAN9220.

The LAN9220will only wake up when it

detects a host write cycle (assertion of

nCS and nWR). Although any write to

the LAN9220, regardless of the data

written, will wake-up the device when

it is in a power-saving mode, it is

required that the BYTE_TEST register

be used for this purpose.

1

Enables Auto-MDIX. Pull high or leave

unconnected to enable Auto-MDIX, pull low to

disable Auto-MDIX.

Note:

When operating at reduced

VDDVARIO voltage levels (less than

3.0V), this pin must be pulled to a valid

level with an external resistor. Refer to

Section 2.2, "External Pull-Up/Pull-

Down Resistors" for more information.

Revision 2.7 (03-15-10)

18

DATASHEET

SMSC LAN9220

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