82575 Ethernet Controller Design Guide

is complete, the driver must read the PHY registers to determine the resolved flow control behavior of the link and reflect these in the MAC register settings (CTRL.TFCE and CTRL.RFCE).

Note: Once PHY Auto-negotiation is complete, the PHY will assert a link indication (LINK) to the MAC. Software must have set the "Set Link Up" bit in the Device Control Register (CTRL.SLU) before the MAC recognizes the LINK indication from the PHY and can consider the link to be up.

3.7Copper/Fiber Switch

The 82575 Ethernet Controller provides significant amount of flexibility in pairing a LAN device with a particular type of media (copper or fiber-optic) as well as the specific transceiver/interface used to communicate with the media. Each MAC, representing a distinct LAN device, can be coupled with an internal copper PHY (the default) or SERDES interface independently. The link configuration specified for each LAN device may be specified in the LINK_MODE field of the Extended Device Control Register (CTRL_EXT) and initialized from the EEPROM Initialization Control Word 3 associated with each LAN device.

In some applications, the software may need to be aware of the presence of a link on the connection not currently active. In order to supply such an indication, any of the the 82575 Ethernet Controller ports may set the AUTOSENSE_EN bit in the CONNSW register (address 0x00034) in order to enable sensing of the non-active connection activity. When in SerDes detect mode, the software should define which indication is used to detect the energy change in SerDes/SGMII mode. It can be either the external signal detect pin or the internal signal detect. This is done using the CONNSW.ENRGSRC bit.

The software can then enable the OMED interrupt in ICR in order to get an indication of any detection of energy in the non active connection.

The following procedure should be followed in order to enable the auto-sense mode:

SerDes-Detect Mode (PHY is active)

Set CONNSW.ENRGSRC to determine the sources for the signal detect indication (1- external SIG_DET, 0- internal SerDes electrical idle). The default of this bit is set by EEPROM.

Set CONNSW.AUTOSENSE_EN.

When signal is detected on the SerDes link, the 82575 Ethernet Controller will set the interrupt bit OMED in ICR and, if enabled, issue an interrupt. The CONNSW.AUTOSENSE_EN will be cleared unless CONNSW.ASCLR_DIS is set. In such a case, the host driver is responsible for the clearing of the AUTOSENSE_EN bit.

PHY-Detect Mode

Set CONNSW.AUTOSENSE_CONF = 1.

Reset the PHY by assertion and de-assertion of CTRL.PHY_RST.

Wait until EEMNGCTL.CFG_DONE is set.

Enter the PHY to Link-Disconnect mode by setting why-reg25.5 via MDIC register.

Set CONNSW.AUTOSENSE_EN = 1 and clear CONNSW.AUTOSENSE_CONF.

When signal is detected on the PHY link, the hardware will set the interrupt bit OMED in ICR and, if enabled, issue an interrupt.

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Intel 317698-001 manual Copper/Fiber Switch, SerDes-Detect Mode PHY is active

317698-001 specifications

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