LAN91C111 datasheet(13/125 Pages) MICROCHIP

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DS00002276A-page 13

LAN91C111

EEPROM Data

Out

EEDO

Output. Connected to the DI input of the

serial EEPROM.

EEPROM Data

EEDI

I with

pulldown**

Input. Connected to the DO output of the

serial EEPROM.

3-5

5-7

I/O Base

IOS0-IOS2

I with

pullup**

Input. External switches can be

connected to these lines to select

between predefined EEPROM

configurations.

Enable

EEPROM

ENEEP

I with

pullup**

Input. Enables (when high or open)

LAN91C111 accesses to the serial

EEPROM. Must be grounded if no

EEPROM is connected to the

LAN91C111.

127, 128

1, 2

Crystal 1

Crystal 2

XTAL1

XTAL2

Iclk**

An external 25 MHz crystal is connected

across these pins. If a TTL clock is

supplied instead, it should be connected

to XTAL1 and XTAL2 should be left open.

XTAL1 is the 5V tolerant input of the

internal amplifier and XTAL2 is the output

of the internal amplifier.

1, 33, 44,

62, 77, 98,

110, 120

3, 35, 46,

64, 79,

100, 112,

122

Power

VDD

+3.3V Power supply pins.

11, 16

13, 18

Analog Power

AVDD

+3.3V Analog power supply pins.

24, 39, 52,

57, 67, 72,

93, 103,

108, 117

26, 41, 54,

59, 69, 74,

95, 105,

110, 119

Ground

GND

Ground pins.

13, 19

15, 21

Analog Ground

AGND

Analog Ground pins

Loopback

LBK

Output. Active when LOOP bit is set

(TCR bit 1).

nLink Status

nLNK

I with

pullup

Input. General-purpose input port used to

convey LINK status (EPHSR bit 14).

nCNTRL

O12

General Purpose Control Pin

X25out

O12

25Mhz Output to external PHY

111

113

Transmit Enable

100 Mbps

TXEN100

O12

Output to MII PHY. Envelope to 100 Mbps

transmission.

119

121

Carrier Sense

100 Mbps

CRS100

I with

pulldown

Input from MII PHY. Envelope of packet

reception used for deferral and backoff

purposes.

125

127

Receive Data

Valid

RX_DV

I with

pulldown

Input from MII PHY. Envelope of data

valid reception. Used for receive data

framing.

112

114

Collision Detect

100 Mbps

COL100

I with

pulldown

Input from MII PHY. Collision detection

input.

Pin No.

Name

Symbol

Buffer

Type

Description

TQFP

QFP

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