ICS1893AFILF datasheet(100/137 Pages) RENESAS

100 / 137 page

ICS1893AF, Rev D 10/26/04

October, 2004

100

Chapter 9

Pin Diagram, Listings, and Descriptions

ICS1893AF Data Sheet - Release

9.2.1

Transformer Interface Pins

The tables in this section list the ICS1893AF pins by their functional grouping.

Table 9-5 lists the pins for the transformer interface group of pins.

Table 9-4.

Configuration Pins

Signal Name

Pin No.

Signal Description

10/100

Output Indication, High=100baseTX Operation

100TCSR

100M Transmit Current Set Resistors (See Figure X)

10TCSR

10M Transmit Current Set Resistor

REFIN

Frequency Reference Input: 25 MHz Input Clock or Crystal

RFOUT

Frequency Reference Output for Crystal

RESETn

System Reset (active low)

Table 9-5.

Transformer Interface Pins

Name

Number

Type

Pin Description

TP_RXN

Input

Twisted-Pair Receive (Data) Negative.

Within this table, see the description at the TP_RXP pin.

TP_RXP

Input

Twisted-Pair Receive (Data) Positive.

Data reception of differential analog signals occurs over the TP_RXN

and TP_RXP pair of differential-signal pins. Together these pins receive

the serial bit stream from the UTP cable through an isolation

transformer.

Depending on the operating mode of the remote link partner, the

received data is one of the following types of signals:

• Two-level 10Base-T (that is, Manchester-encoded) signals

• Three-level 100Base-TX, (that is, MLT-3 encoded) signals

The TP_RXN and TP_RXP pins interface directly to an isolation

transformer, which in turn, interfaces with the UTP cable.

TP_TXN

Output

Twisted-Pair Transmit (Data) Negative.

Within this table, see the description at the TP_TXP pin.

TP_TXP

Output

Twisted-Pair Transmit (Data) Positive.

Differential analog signal transmission occurs over the TP_TXN and

TP_TXP pair of pins. Together these pins drive the serial bit stream

over the UTP cable.

Depending on the operating mode of the ICS1893AF MDI, the

current-driven differential driver produces one of the following types of

signals:

• Two-level 10Base-T (that is, Manchester-encoded) signals

• Three-level 100Base-T (that is, MLT-3 encoded) signals

The TP_RXN and TP_RXP pins interface directly to an isolation

transformer, which in turn, drives the UTP cable.

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