ICS1893AGILF View Datasheet(PDF) - Integrated Circuit Systems
Part Name
Description
MFG CO.
'ICS1893AGILF' PDF : 135 Pages View PDF
ICS1893AG Data Sheet - Preliminary
Chapter 5 Operating Modes Overview
5.3 Automatic Power-Saving Operations
The ICS1893AG has power-saving features that automatically minimize its total power consumption while
it is operating. Table 5-1 lists the ICS1893AG automatic power-saving features for the various modes.
Table 5-1. Automatic Power-Saving Features, 10Base-T and 100Base-TX Modes
Power-
Saving
Feature
Mode for ICS1893AG
10Base-T Mode
100Base-TX Mode
Disable Inter- In 10Base-T mode, the ICS1893AG
nal Modules disables all its internal 100Base-TX
modules.
In 100Base-TX mode, the ICS1893AG
disables all its internal 10Base-T modules.
STA Control
of Automatic
Power-
Saving
Features
When an STA sets the state of the
ICS1893AG Extended Control Register 2,
bit 19.0 to logic:
• Zero, the 100Base-TX modules always
remain enabled, even during 10Base-T
operations.
• One, the ICS1893AG automatically
disables 100Base-TX modules while the
ICS1893AG is operating in 10Base-T
mode.
When an STA sets the state of the
ICS1893AG Extended Control Register 2,
bit 19.1 to logic:
• Zero, the 10Base-T modules always
remain enabled, even during
100Base-TX operations.
• One, the ICS1893AG automatically
disables 10Base-T modules while the
ICS1893AG is operating in 100Base-TX
mode.
5.4 Auto-Negotiation Operations
The ICS1893AG 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 ICS1893AG 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 ICS1893AG 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”.
ICS1893AG, Rev. A 04/14/05
Copyright © 2005, Integrated Circuit Systems, Inc.
All rights reserved.
21
April, 2005
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