82503 datasheet(9/45 Pages) INTEL

9 / 45 page

82503

27 LED Pins

Symbol

PLCC

QFP

Type

Name and Function

TxLED

TRANSMIT LED

LED output Indicates transmit status of the AUI or

TPE port Normally off (high) output Turns on to indicate

transmission Flashes at a rate dependent on the level of transmit

activity Upon entering a customer test mode this pin must be

driven high either through an LED or a resistor

RxLED

RECEIVE LED

LED output Indicates receive status of the AUI or

TPE port Normally off (high) output Turns on to indicate reception

Flashes at a rate dependent on the level of receive activity Upon

entering a customer test mode this pin must be driven high either

through an LED or a resistor

COLED

COLLISION LED

LED output Indicates collision status of the AUI

or TPE port Normally off (high) output Turns on to indicate

collision Flashes at a rate dependent on the level of collision

activity This pin is also used to determine which customer test

modes are entered

LILED

LINK INTEGRITY LED

LED output Normally on (low) output which

indicates good link integrity on the TPE port during TPE mode

Remains on when link integrity function has been disabled Turns off

during AUI mode or when link integrity fails in TPE mode Minimum

off time is 100 ms minimum on time is set by the link integrity

function

POLED

POLARITY INDICATION

LED output If the 82503 detects that the

receive TPE wires are reversed POLED will turn on (low) to indicate

the fault POLED remains on even if APOLXSQ is high and the

82503 has automatically corrected for the reversed wires

NOTE

1 The LED outputs have a weak pull-up capable of sourcing 500 mA They can sink 10 mA while still meeting TTL levels All

LEDs can be used as indication pins if no LED is needed Some of these outputs include pulse width conditioning which

should be accounted for in software

82503 Datasheet(PDF) 9 Page - Intel Corporation

82503 Datasheet(HTML) 9 Page - Intel Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45

Datasheet Download

Link URL