ICS1893BY-10 Data Sheet - Release
Chapter 6 Functional Blocks
If the remote link partner responds to the FLP bursts with FLP bursts, then the link partner is a 100Base-TX
node that can support the auto-negotiation process. In this case, the ICS1893BY-10 sets to logic one the
Auto-Negotiation Expansion Register’s Link Partner Auto-Negotiation Ability bit (bit 6.0).
If the Auto-Negotiation sublayer does not receive any signal when monitoring the receive channel, then the
QuickPoll Detailed Status Register’s Signal Detect bit (bit 17.3) is set to logic one, indicating that no signal
is present.
Another possibility is that the ICS1893BY-10 senses that it is receiving multiple technology indications. In
this situation, the ICS1893BY-10 cannot determine which technology to enable. It informs the STA of this
problem by setting to logic one the Auto-Negotiation Expansion Register’s Parallel Detection Fault bit (bit
6.4).
6.2.3 Auto-Negotiation: Remote Fault Signaling
If the remote link partner detects a fault, the ICS1893BY-10 reports the remotely detected fault to the STA
by setting to logic one the Remote Fault Detected bit(s), 1.4, 5.13, 17.1, and 19.13. In general, the
reception of a remote fault means that the remote link partner has a problem with the integrity of its receive
channel.
Similarly, if the ICS1893BY-10 detects a link fault, it transmits a remote fault-detected condition to its
remote link partner. In this situation, the ICS1893BY-10 sets to logic one the Auto-Negotiation Link Partner
Ability Register’s Remote Fault Indication bit (bit 4.13).
For details, see Section 7.14.3, “Remote Fault (bit 19.13)” and Section 7.3.9, “Remote Fault (bit 1.4)”.
6.2.4 Auto-Negotiation: Reset and Restart
If enabled, execution of the ICS1893BY-10 auto-negotiation process occurs at power-up and upon
management request. There are two primary ways to begin the Auto-Negotiation state machine:
• ICS1893BY-10 reset
• Auto-Negotiation Restart
6.2.4.1 Auto-Negotiation Reset
During a reset, the ICS1893BY-10 initializes its Auto-Negotiation sublayer modules to their default states.
(That is, the Auto-Negotiation Arbitration State Machine and the Auto-Negotiation Progress Monitor reset to
their idle states.) In addition, the Auto-Negotiation Progress Monitor status bits are all set to logic zero. This
action occurs for any type of reset (hardware reset, software reset, or power-on reset).
6.2.4.2 Auto-Negotiation Restart
As with a reset, during an Auto-Negotiation restart, the ICS1893BY-10 initializes the Auto-Negotiation
Arbitration State Machine and the Auto-Negotiation Progress Monitor modules to their default states.
However, during an Auto-Negotiation Restart, the Auto-Negotiation Progress Monitor status bits maintain
their current state. Only three events can alter the state of the Auto-Negotiation Progress Monitor status
bits after a Restart: (1) an STA read operation, (2) a reset, or (3) the Auto-Negotiation Arbitration State
Machine progressing to a higher state or value.
The Auto-Negotiation Progress Monitor Status bits change only if they are progressing to a state with a
value greater than their current state (that is, a state with a higher logical value than that of their current
state). For a detailed explanation of these bits and their operation, see Section 6.2.5, “Auto-Negotiation:
Progress Monitor”.
After the Auto-Negotiation Arbitration State Machine reaches its final state (which is Auto-Negotiation
Complete), only an STA read of the QuickPoll Detailed Status Register or an ICS1893BY-10 reset can alter
these status bits.
ICS1893BY-10 Rev A 3/24/04
March, 2004
Copyright © 2004, Integrated Circuit Systems, Inc.
All rights reserved.
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ICSI [ INTEGRATED CIRCUIT SOLUTION INC ]
