82575 Ethernet Controller Design Guide

3.6.7Auto-Negotiation differences between PHY, SerDes and SGMII

SGMII protocol includes an auto-negotiation process in order to establish the MAC - PHY connection. This auto-negotiation process is not dependent on the SRDS0/

1_SIG_DET signal, as this signal indicates the status of the PHY signal detection (usually used in Optical PHY).

The following shows the outcome of this auto-negotiation process:

Link status

Speed

Duplex.

This information is used by the hardware to configure the MAC, when operating in SGMII mode.

For SerDes and SGMII modes, bits FD and LU of the Device Status register (STATUS), and bits in the PCS_LSTS register provide status information regarding the negotiated link.

Auto-Negotiation may be initiated by the following:

LRST transition from 1 to 0

PCS_LCMD.AN_ENABLE transition from 0 to 1

Receipt of /C/ ordered set during normal operation

Receipt of different value of the /C/ ordered set during the negotiation process

Transition from loss of synchronization to synchronized state (if AN_ENABLE is set).

PCS_LCMD.AN_RESTART transition from 0 to 1

Resolution of the negotiated link determines device operation with respect to speed and duplex settings. These negotiated capabilities override advertised and software- controlled device configuration.

When working in SGMII mode, there is no need for setting of the PCAS_ANADV register, as the MAC advertisement word is fixed. The result of the SGMII level auto- negotiation can be read from the PCS_LPAB register.

3.6.8Copper PHY Link Configuration

When operating with the internal PHY, link configuration is generally determined by PHY Auto-Negotiation. The driver must intervene in cases where a successful link is not negotiated or the user desires to manually configure the link.

PHY Auto-Negotiation (Speed, Duplex, Flow-Control) when using a copper PHY, the PHY performs the Auto-Negotiation function. Auto-Negotiation provides a method for two link partners to exchange information in a systematic manner in order to establish a link configuration providing the highest common level of functionality supported by both partners. Once configured, the link partners exchange configuration information to resolve link settings such as:

Speed: 10/100/1000 Mb/s

Duplex: Full- or Half-

Flow Control Operation

PHY specific information required for establishing the link is also exchanged.

Note: If flow control is enabled, the settings for the desired flow control behavior must be set by software in the PHY registers and Auto-Negotiation restarted. After Auto-Negotiation

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Intel 317698-001 manual Auto-Negotiation differences between PHY, SerDes and Sgmii, Copper PHY Link Configuration

317698-001 specifications

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