參數(shù)資料
型號： 1893YI-10
廠商： INTEGRATED DEVICE TECHNOLOGY INC
元件分類： 網(wǎng)絡(luò)接口
英文描述： DATACOM, INTERFACE CIRCUIT, PQFP64
封裝： 10 X 10 MM, TQFP-64
文件頁數(shù)： 69/152頁
文件大?。?/td> 943K
代理商： 1893YI-10
Chapter 5
Operating Modes Overview
ICS1893 Rev C 6/6/00
June, 2000
23
ICS1893 - Release
Copyright 2000, Integrated Circuit Systems, Inc.
All rights reserved.
5.3
Automatic Power-Saving Operations
The ICS1893 has power-saving features that automatically minimize its total power consumption while it is
operating. Table 5-1 lists the ICS1893 automatic power-saving features for the various modes.
5.4
Auto-Negotiation Operations
The ICS1893 has an Auto-Negotiation sublayer and 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 ICS1893 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 ICS1893 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 ICS1893 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 ICS1893
10Base-T Mode
100Base-TX Mode
Disable Inter-
nal Modules
In 10Base-T mode, the ICS1893 disables
all its internal 100Base-TX modules.
In 100Base-TX mode, the ICS1893
disables all its internal 10Base-T modules.
STA Control
of Automatic
Power-
Saving
Features
When an STA sets the state of the ICS1893
Extended Control Register 2, bit 19.0 to
logic:
Zero, the 100Base-TX modules always
remain enabled, even during 10Base-T
operations.
One, the ICS1893 automatically
disables 100Base-TX modules while the
ICS1893 is operating in 10Base-T
mode.
When an STA sets the state of the ICS1893
Extended Control Register 2, bit 19.1 to
logic:
Zero, the 10Base-T modules always
remain enabled, even during
100Base-TX operations.
One, the ICS1893 automatically
disables 10Base-T modules while the
ICS1893 is operating in 100Base-TX
mode.
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PDF描述
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