1892YLF IDT, Integrated Device Technology Inc, 1892YLF Datasheet - Page 69

• Manufacturer Part Number: 1892YLF
• Manufacturer: IDT, Integrated Device Technology Inc

Specifications of 1892YLF

• Lead Free Status / RoHS Status: Compliant

8.3.9 Remote Fault (bit 1.4)
8.3.10 Auto-Negotiation Ability (bit 1.3)
8.3.11 Link Status (bit 1.2)
ICS1892, Rev. D, 2/26/01
The STA reads bit 1.4 to determine if a Remote Fault exists. The ICS1892 sets bit 1.4 based on the Remote
Fault bit received from its remote link partner. The ICS1892 receives the Remote Fault bit as part of the
Link Code Word exchanged during the auto-negotiation process. If the remote link partner:
•
•
Bit 1.4 is a latching high status bit. (For more information on latching high and latching low bits, see
8.1.4.1, “Latching High Bits”
Note:
The STA reads bit 1.3 to determine if the ICS1892 can support the auto-negotiation process. If the
ICS1892:
•
•
The purpose of this Link Status bit (as well as the QuickPoll Register’s Link Status bit, bit 17.0) is to
determine if an established link is dropped, even momentarily. An STA reads bit 1.2 to determine the state
of the link between the ICS1892 and its remote partner. To indicate a link that is:
•
•
This bit is a latching low (LL) bit that the Link Monitor function controls. (For more information on latching
high and latching low bits, see
Bits”.) The criterion used by the Link Monitor to determine if a link is valid or invalid depends on the
following:
•
•
•
•
The Link Monitor function observes the data received by either 10Base-T or 100Base-TX Twisted-Pair
Receivers to determine the link status. The results of this continual monitoring are stored in the Link Status
bit. An STA can access the Link Status bit in either the Status Register (bit 1.2) or the QuickPoll Detailed
Status Register (bit 17.0).
If Auto-Negotiation mode is enabled, a local receive channel error occurs if link pulses are not present
during the auto-negotiation process or when operating in the 10Base-T mode.
Note:
Sets the Link Code Word Remote Fault bit to logic one, then the ICS1892 sets bit 1.4 to logic one. In this
case, the remote link partner reports the detection of a fault, which typically occurs when the remote link
partner is having a problem with its receive channel.
Clears the Link Code Word Remote Fault bit to logic zero, then the ICS1892 sets bit 1.4 to logic zero.
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 ICS1892, the default value
of bit 1.3 is logic one.)
Valid, the ICS1892 sets bit 1.2 to logic one.
Invalid, the ICS1892 clears bit 1.2 to logic zero.
Type of link
Present link state (valid or invalid)
Presence of any link errors
Auto-negotiation process
ICS1892
The STA can access the Remote Fault bit through Management Registers 1 (bit 1.4), 5 (bit 5.13),
and 17 (bit 17.1). The Remote Fault bit is cleared when an STA reads any one of these bits.
The Link Status bit is accessible through two Management Registers and is set high when an STA
reads either one of them.
© 2000-2001, Integrated Circuit Systems, Inc.
All rights reserved.
and
Section 8.1.4.1, “Latching High Bits”
Section 8.1.4.2, “Latching Low
69
Bits”.)
and
Chapter 8 Management Register Set
Section 8.1.4.2, “Latching Low
February 26, 2001
Section