IDT1893AFLFT IDT, Integrated Device Technology Inc, IDT1893AFLFT Datasheet - Page 22

• Manufacturer Part Number: IDT1893AFLFT
• Manufacturer: IDT, Integrated Device Technology Inc

Specifications of IDT1893AFLFT

• Lead Free Status / RoHS Status: Compliant

5.3 Automatic Power-Saving Operations
5.4 Auto-Negotiation Operations
ICS1893AF, Rev D 10/26/04
The ICS1893AF has power-saving features that automatically minimize its total power consumption while it
is operating.
Table 5-1. Automatic Power-Saving Features, 10Base-T and 100Base-TX Modes
The ICS1893AF 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 ICS1893AF 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 ICS1893AF 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
Disable Inter-
nal Modules
STA Control
of Automatic
Power-
Saving
Features
Feature
Power-
Saving
ICS1893AF Data Sheet - Release
Table 5-1
In 10Base-T mode, the ICS1893AF
disables all its internal 100Base-TX
modules.
When an STA sets the state of the
ICS1893AF Extended Control Register 2,
bit 19.0 to logic:
•
•
Zero, the 100Base-TX modules always
remain enabled, even during 10Base-T
operations.
One, the ICS1893AF automatically
disables 100Base-TX modules while the
ICS1893AF is operating in 10Base-T
mode.
lists the ICS1893AF automatic power-saving features for the various modes.
Copyright © 2004, Integrated Circuit Systems, Inc.
10Base-T Mode
All rights reserved.
Section 7.2, “Functional Block:
22
Mode for ICS1893AF
In 100Base-TX mode, the ICS1893AF
disables all its internal 10Base-T modules.
When an STA sets the state of the
ICS1893AF Extended Control Register 2,
bit 19.1 to logic:
•
•
Zero, the 10Base-T modules always
remain enabled, even during
100Base-TX operations.
One, the ICS1893AF automatically
disables 10Base-T modules while the
ICS1893AF is operating in 100Base-TX
mode.
Chapter 5 Operating Modes Overview
100Base-TX Mode
Auto-Negotiation”.
October, 2004