ICS1893AF datasheet(23/137 Pages) RENESAS

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Chapter 5

Operating Modes Overview

ICS1893AF, Rev. D 10/26/04

October, 2004

ICS1893AF Data Sheet - Release

5.5

100Base-TX Operations

The ICS1893AF 100Base-TX mode provides 100Base-TX physical layer (PHY) services as defined in the

ISO/IEC 8802-3 standard. In the 100Base-TX mode, the ICS1893AF is a 100M translator between a MAC

and the physical transmission medium. As such, the ICS1893AF 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 ICS1893AF

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 ICS1893AF employs DSP-based wave shaping, adaptive

equalization, and baseline wander correction. In addition, in 100Base-TX mode, the ICS1893AF 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 ICS1893AF 10Base-T mode provides 10Base-T physical layer (PHY) services as defined in the

ISO/IEC 8802-3 standard. In the 10Base-T mode, the ICS1893AF is a 10M translator between a

MAC/repeater and the physical transmission medium. In 10Base-T mode, the ICS1893AF 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

5.7

Half-Duplex and Full-Duplex Operations

The ICS1893AF 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 ICS1893AF disables its loopback function (that is, it does not

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

• In both 10Base-T and 100Base-TX full-duplex operations, the ICS1893AF 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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