LAN91C111 datasheet(14/125 Pages) MICROCHIP

14 / 125 page

LAN91C111

DS00002276A-page 14

 2011-2016 Microchip Technology Inc.

Note 5-1

If the EEPROM is enabled.

113-116

115-118

Transmit Data

TXD3-

TXD0

O12

Outputs. Transmit Data nibble to MII PHY.

109

111

Transmit Clock

TX25

I with

pullup

Input. Transmit clock input from MII.

Nibble rate clock (25MHz for 100Mbps &

2.5MHz for 10Mbps).

118

120

Receive Clock

RX25

I with

pullup

Input. Receive clock input from MII PHY.

Nibble rate clock. (25MHz for 100Mbps &

2.5MHz for 10Mbps).

121-124

123-126

Receive Data

RXD3-

RXD0

I with

pullup

Inputs. Received Data nibble from MII

PHY.

Management

Data Input

MDI

I with

pulldown

MII management data input.

Management

Data Output

MDO

MII management data output.

Management

Clock

MCLK

MII management clock.

126

128

Receive Error

RX_ER

I with

pulldown

Input. Indicates a code error detected by

PHY. Used by the LAN91C111 to discard

the packet being received. The error

indication reported for this event is the

same as a bad CRC (Receive Status

Word bit 13).

nChip Select

Output

nCSOUT

Output. Chip Select provided for mapping

of PHY functions into LAN91C111

decoded space. Active on accesses to

LAN91C111’s eight lower addresses

when the BANK SELECTED is 7.

External

Resistor

RBIAS

Transmit Current Set. An external resistor

connected between this pin and GND will

set the output current for the TP transmit

outputs

TPO+

O/I

Twisted Pair Transmit Output, Positive.

TPO-

O/I

Twisted Pair Transmit Output, Negative

TPI+

I/O

Twisted Pair Receive Input, Positive

TPI-

I/O

Twisted Pair Receive Input, Negative.

nLEDA

OD24

PHY LED Output

nLEDB

OD24

PHY LED Output

Pin No.

Name

Symbol

Buffer

Type

Description

TQFP

QFP

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