ICS1892 datasheet(104/148 Pages) ICST

104 / 148 page

ICS1892, Rev. D, 2/26/01

February 26, 2001

104

Chapter 9

Pin Diagram, Listings, and Descriptions

ICS1892 Data Sheet

9.2

ICS1892 Pin Descriptions

The tables in this section list the ICS1892 pins by their functional grouping.

9.2.1

Transformer Interface Pins

Table 9-3 lists the pins for the transformer interface group of pins.

Table 9-3.

Transformer Interface Pins

Name

Number

Type

Pin Description

TP_RXN

Input

Twisted-Pair Receive (Data) Negative.

Within this table, see the description at pin 10, TP_RXP.

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

These signals 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 pin 5, TP_TXP.

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 ICS1892 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-TX, that is, MLT-3 encoded) signals

These signals interface directly to an isolation transformer, which in

turn, drives the UTP cable.

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