ICS1893Y-10 Datasheet, PDF (72/150 Pages) –

ICS1893Y-10 Data Sheet - Release
Chapter 7 Management Register Set
7.3.9 Remote Fault (bit 1.4)
An STA reads bit 1.4 to determine if a Remote Fault exists. The ICS1893Y-10 sets bit 1.4 based on the
Remote Fault bit received from its remote link partner. The ICS1893Y-10 receives the Remote Fault bit as
part of the Link Code Word exchanged during the auto-negotiation process. If the ICS1893Y-10 receives a
Link Code Word from its remote link partner and the Remote Fault bit is set to:
• Zero, then the ICS1893Y-10 sets bit 1.4 to logic zero.
• One, then the ICS1893Y-10 sets bit 1.4 to logic one. In this case, the remote link partner is reporting the
detection of a fault, which typically occurs when the remote link partner is having a problem with its
receive channel.
Bit 1.4 is a latching high status bit. (For more information on latching high and latching low bits, see Section
7.1.4.1, “Latching High Bits” and Section 7.1.4.2, “Latching Low Bits”.)
Note:
The ICS1893Y-10 has two versions of the Remote Fault bit.
• One version of the Remote Fault bit is a latching high version. An STA can access this version
through either Management Register 1 (bit 1.4) or 17 (bit 17.1). This bit 1.4/17.1 is cleared when
an STA reads either of these registers. (Bit 1.4 is identical to bit 17.1 in that they are the same
internal bit.)
• Another version of the Remote Fault bit is updated whenever the ICS1893Y-10 receives a new
Link Control Word. An STA can access this version through Management Register 5 (bit 5.13),
which like bits 1.4/17.1, also reports the status of the Remote Fault bit received from the remote
link partner. However, bit 5.13 is not a latching high bit.
The operation of both bit 1.4/17.1 and bit 5.13 are in compliance with the IEEE Std 802.3u.
7.3.10 Auto-Negotiation Ability (bit 1.3)
The STA reads bit 1.3 to determine if the ICS1893Y-10 can support the auto-negotiation process. If the
ICS1893Y-10:
• Cannot support the auto-negotiation process, it clears bit 1.3 to logic zero.
• Can support the auto-negotiation process, it sets bit 1.3 to logic one. (For the ICS1893Y-10, the default
value of bit 1.3 is logic one.)
ICS1893Y-10 Rev F 1/20/04
Copyright © 2004, Integrated Circuit Systems, Inc.
All rights reserved.
72
January, 2004