ICS1892Y datasheet(22/148 Pages) ICST

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ICS1892, Rev. D, 2/26/01

February 26, 2001

Chapter 5

Operating Modes Overview

ICS1892 Data Sheet

5.5

100Base-TX Operations

The ICS1892 100Base-TX mode is a primary operating mode that provides 100Base-TX physical layer

(PHY) services as defined in the ISO/IEC 8802-3 standard. In the 100Base-TX mode, the ICS1892 is a

100M translator between a MAC/repeater and the physical transmission medium. As such, the ICS1892

has two interfaces, both of which are fully configurable: one to the MAC/repeater and one to the Link

Segment. In 100Base-TX mode, the ICS1892 provides the following functions:

• Data conversion from both parallel-to-serial and serial-to-parallel formats

• Data encoding/decoding (4B/5B, NRZ/NRZI, and MLT-3)

• Data scrambling/descrambling

• Data transmission/reception over a twisted-pair medium

To accurately transmit and receive data, the ICS1892 employs DSP-based wave shaping, adaptive

equalization, and baseline wander correction. In addition, in 100Base-TX mode, the ICS1892 provides a

variety of control and status means to assist with Link Segment management. For more information on

100Base-TX, see Section 7.4, “Functional Block: 100Base-TX TP-PMD Operations”.

5.6

10Base-T Operations

The ICS1892 10Base-T mode is another primary operating mode that provides 10Base-T physical layer

(PHY) services as defined in the ISO/IEC 8802-3 standard. In the 10Base-T mode, the ICS1892 is a 10M

translator between a MAC/repeater and the physical transmission medium. As such, the ICS1892 has two

interfaces, both of which are fully configurable: one to the MAC/repeater and one to the Link Segment. In

10Base-T mode, the ICS1892 provides the following functions:

• Data conversion from both parallel-to-serial and serial-to-parallel formats

• Manchester data encoding/decoding

• Data transmission/reception over a twisted-pair medium

In addition, in 10Base-T mode, the ICS1892 provides a variety of control and status means to assist with

Link Segment management. For more information on 10Base-T, see Section 7.5, “Functional Block:

10Base-T Operations”.

5.7

Half-Duplex and Full-Duplex Operations

The ICS1892 supports half-duplex and full-duplex operations for both 10Base-T and 100Base-TX

applications. Full-duplex operation allows simultaneous transmission and reception of data, which

effectively doubles the Link Segment throughput to either 20 Mbps (for 10Base-T operations) or 200 Mbps

(for 100Base-TX operations).

As per the ISO/IEC standard, full-duplex operations differ slightly from half-duplex operations. These

differences are necessary, as during full-duplex operations a PHY actively uses both its transmit and

receive data paths simultaneously.

• In 10Base-T full-duplex operations, the ICS1892 disables its loopback function (that is, it does not

automatically loop back data from its transmitter to its receiver and disable its SQE Test function).

• In both 10Base-T and 100Base-TX full-duplex operations, the ICS1892 asserts its CRS signal only in

response to receive activity while its COL signal always remains inactive.

For more information on half-duplex and full-duplex operations, see the following sections:

• Section 8.2, “Register 0: Control Register”

• Section 8.2.8, “Duplex Mode (bit 0.8)”

• Section 8.3, “Register 1: Status Register”

• Section 8.6, “Register 4: Auto-Negotiation Register”

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