ICS1892 Integrated Circuit Systems, ICS1892 Datasheet - Page 79
ICS1892
Manufacturer Part Number
ICS1892
Description
10Base-T/100Base-TX Integrated PHYceiver
Manufacturer
Integrated Circuit Systems
Datasheet
1.ICS1892.pdf
(148 pages)
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8.7.2 Acknowledge (bit 5.14)
8.7.3 Remote Fault (bit 5.13)
8.7.4 Technology Ability Field (bits 5.12:5)
8.7.5 Selector Field (bits 5.4:0)
ICS1892, Rev. D, 2/26/01
The ISO/IEC specification defines bit 5.14 as the Acknowledge bit. When this bit is a:
•
•
The ISO/IEC specification defines bit 5.13 as the Remote Fault bit. This bit is set based on the Link Control
Word received from the remote link partner. When this bit is a logic:
•
•
The Technology Ability Field (TAF) bits (bits 5.12:5), determine the specific abilities that the remote link
partner is advertising. These bits are set based upon the Link Code Word received from the remote link
partner during the auto-negotiation process. The ISO/IEC specification defines the TAF technologies in
Annex 28B.
The ISO/IEC specification reserves bits 5.12:10 for future use. When each of these reserved bits is:
•
•
ICS uses some of these reserved bits to invoke auxiliary functions. To ensure proper operation of the
ICS1892, an STA must maintain the default value of these bits. Therefore, ICS recommends that an STA
always write the default value of any reserved bits during all management register write operations.
To ensure proper operation of the ICS1892, an STA must maintain the default value of these bits.
Therefore, ICS recommends that an STA always write the default value of any reserved bits during all
management register write operations.
The Selector Field bits indicate the technology or encoding that the remote link partner is using for the
Auto-Negotiation message. The ICS1892 supports only IEEE Std 802.3, represented by a value of 00001b
in bits 5.4:0. The ISO/IEC standard defines the Selector Field technologies in Annex 28A. Presently, the
IEEE standard defines the following two valid codes:
•
•
Zero, it indicates that the remote link partner has not received the ICS1892 Link Control Word.
One, it indicates to the ICS1892 / STA that the remote link partner has acknowledged reception of the
ICS1892 Link Control Word.
Zero, it indicates that the remote link partner does not have a Link Fault.
One, it indicates to the ICS1892 / STA that the remote link partner detects a Link Fault.
Read by an STA, the ICS1892 returns a logic zero.
Written to by an STA, the STA must use the default value specified in this data sheet.
00001b (IEEE Std 802.3)
00010b (IEEE Std 802.9)
ICS1892
© 2000-2001, Integrated Circuit Systems, Inc.
All rights reserved.
79
Chapter 8 Management Register Set
February 26, 2001
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