82503 datasheet(7/45 Pages) INTEL

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82503

24 TPE Pins

Symbol

PLCC

QFP

Type

Name and Function

TDH

TP TRANSMIT PAIR DRIVERS

These four outputs constitute the

twisted-pair drivers which have predistortion capabilities The TDH

TDH

TDH outputs generate the 10 Mbs Manchester Encoded data The

TDL

TDLTDL outputs mirror the TDHTDH outputs except for fat bit

TDL

occurrences (100 ns pulses) During the second half of a fat bit

(either high or low) the TDLTDL outputs are inverted with respect

to TDHTDH outputs This signal behavior reduces the amount of

jitter by preventing overcharge on the twisted pair medium

TP RECEIVE PAIR

The differential twisted pair receiver The

receiver pair is connected to the twisted pair medium and is driven

with 10 Mbs Manchester encoded data

25 Controller Interface Pins

Symbol

PLCC

QFP

Type

Name and Function

TxC

TRANSMIT CLOCK

A 10 MHz clock output tied directly to the

transmit clock pin of the Ethernet controller Changes sense

depending on controller selected Active low for Intel and Fujitsu

controller interfaces active high for National and AMD interfaces

Can drive one TTL load

TxD

TRANSMIT DATA

TTL input NRZ serial data is clocked in on TxD

from the Ethernet controller Connects directly to the transmit data

pin of the Ethernet controller

RTS

REQUEST TO SEND

TTL input An active low input signal

synchronous to TxC which enables data transmission on the active

port Changes sense depending on controller selected Active low

for the Intel controller interface active high for National AMD and

Fujitsu interfaces

RxC

RECEIVE CLOCK

A 10 MHz clock output tied directly to the

receive clock pin of the Ethernet controller This clock is the

recovered clock from incoming data on the active port Changes

sense depending on controller selected Active low for Intel and

Fujitsu controller interfaces active high for National and AMD

interfaces Can drive one TTL load

RxD

RECEIVE DATA

Received NRZ data (synchronous to RxC) passed

to the Ethernet controller Connect directly to the receive data pin of

the controller Can drive one TTL load

CRS

CARRIER SENSE

Output that alerts the Ethernet controller that

data is present on the active port Connects directly to the carrier

sense pin of the Ethernet controller Changes sense depending on

controller mode selected Active low for Intel controller interface

active high for National AMD and Fujitsu interfaces Can drive one

TTL load

CDT

COLLISION DETECT

Output that indicates presence of a collision

Connects directly to the collision detect pin of the Ethernet

controller Changes sense depending on controller selected Active

low for Intel and Fujitsu controller interfaces active high for National

and AMD interfaces Can drive one TTL load

82503 Datenblatt(PDF) 7 Page - Intel Corporation

82503 Datenblatt(HTML) 7 Page - Intel Corporation

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