ICS1893CF datasheet(28/127 Pages) RENESAS

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ICS1893CF, Rev. K, 05/13/10

May, 2010

Chapter 6 Functional Blocks

ICS1893CF Data Sheet - Release

6.2.3 Auto-Negotiation: Remote Fault Signaling

If the remote link partner detects a fault, the ICS1893CF 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 ICS1893CF detects a link fault, it transmits a remote fault-detected condition to its remote

link partner. In this situation, the ICS1893CF sets to logic one the Auto-Negotiation Link Partner Ability

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 ICS1893CF auto-negotiation process occurs at power-up and upon

management request. There are two primary ways to begin the Auto-Negotiation state machine:

• ICS1893CF reset

• Auto-Negotiation Restart

6.2.4.1 Auto-Negotiation Reset

During a reset, the ICS1893CF 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 ICS1893CF 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 ICS1893CF reset can alter

these status bits.

Any of the following situations initiates a restart of the ICS1893CF Auto-Negotiation sublayer:

• A link failure

• In software mode:

– Writing a logic one to the Control Register’s Restart Auto-Negotiation bit (bit 0.9), which is a self-

clearing bit.

– Toggling the Control Register’s Auto-Negotiation Enable bit (bit 0.12) from a logic one to a logic zero,

and back to a logic one.

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