ICS1892 datasheet(21/148 Pages) ICST

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Chapter 5

Operating Modes Overview

ICS1892, Rev. D, 2/26/01

February 26, 2001

ICS1892

5.3

Automatic Power-Saving Operations

The ICS1892 has power-saving features that automatically minimize its total power consumption while it is

operating. Table 5-1 lists the ICS1892 automatic power-saving features for the various modes.

5.4

Auto-Negotiation Operations

The ICS1892 has an Auto-Negotiation sublayer. It provides both an input pin, ANSEL (Auto-Negotiation

Select) and a Control Register bit (bit 0.12) to determine whether its Auto-Negotiation sublayer is enabled

or disabled. The ICS1892 HW/SW input pin exclusively selects whether the ANSEL pin (which is used for

the hardware mode) or Control Register bit 0.12 (which is used for the software mode) controls its

Auto-Negotiation sublayer.

When enabled, the ICS1892 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 ICS1892 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 7.2, “Functional Block: Auto-Negotiation”.

Table 5-1.

Automatic Power-Saving Features, 10Base-T and 100Base-TX Modes

Power-

Saving

Feature

Mode for ICS1892

10Base-T Mode

100Base-TX Mode

Disable Inter-

nal Modules

In 10Base-T mode, the ICS1892 disables

all its internal 100Base-TX modules.

In 100Base-TX mode, the ICS1892

disables all its internal 10Base-T modules.

STA Control

of Automatic

Power-

Saving

Features

When an STA sets the state of the ICS1892

Extended Control Register 2, bit 19.0 to

logic:

• Zero, the 100Base-TX modules always

remain enabled, even during 10Base-T

operations.

• One, the ICS1892 automatically

disables 100Base-TX modules while the

ICS1892 is operating in 10Base-T

mode.

When an STA sets the state of the ICS1892

Extended Control Register 2, bit 19.1 to

logic:

• Zero, the 10Base-T modules always

remain enabled, even during

100Base-TX operations.

• One, the ICS1892 automatically

disables 10Base-T modules while the

ICS1892 is operating in 100Base-TX

mode.

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