ICS1893CF datasheet(13/126 Pages) ICST

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Chapter 4 Operating Modes Overview

ICS1893CF, Rev. F, 03/01/07

Mar. 2007

ICS1893CF Data Sheet Rev. F - Release

4.3 Automatic Power-Saving Operations

The ICS1893CF has power-saving features that automatically minimize its total power consumption while it

is operating. Table 4-1 lists the ICS1893CF automatic power-saving features for the various modes.

4.4 Auto-Negotiation Operations

The ICS1893CF has an Auto-Negotiation sublayer and provides a Control Register bit (bit 0.12) to

determine whether its Auto-Negotiation sublayer is enabled or disabled.

When enabled, the ICS1893CF Auto-Negotiation sublayer exchanges technology capability data with its

remote link partner and automatically selects the highest-performance operating mode it has in common

with its remote link partner. For example, if the ICS1893CF supports 100Base-TX and 10Base-T modes –

but its link partner supports 100Base-TX and 100Base-T4 modes – the two devices automatically select

100Base-TX as the highest-performance common operating mode. For details regarding initialization and

control of the auto-negotiation process, see Section 6.2, “Functional Block: Auto-Negotiation”.

Table 4-1. Automatic Power-Saving Features, 10Base-T and 100Base-TX Modes

Power-

Saving

Feature

Mode for ICS1893CF

10Base-T Mode

100Base-TX Mode

Disable Inter-

nal Modules

In 10Base-T mode, the ICS1893CF

disables all its internal 100Base-TX

modules.

In 100Base-TX mode, the ICS1893CF

disables all its internal 10Base-T modules.

STA Control

of Automatic

Power-

Saving

Features

When an STA sets the state of the

ICS1893CF Extended Control Register 2,

bit 19.0 to logic:

• Zero, the 100Base-TX modules always

remain enabled, even during 10Base-T

operations.

• One, the ICS1893CF automatically

disables 100Base-TX modules while the

ICS1893CF is operating in 10Base-T

mode.

When an STA sets the state of the

ICS1893CF Extended Control Register 2,

bit 19.1 to logic:

• Zero, the 10Base-T modules always

remain enabled, even during

100Base-TX operations.

• One, the ICS1893CF automatically

disables 10Base-T modules while the

ICS1893CF is operating in 100Base-TX

mode.

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