82575 Ethernet Controller Design Guide

3.2.1LAN Disable for 82575 Ethernet Controller Gigabit Ethernet Controller

The 82575 Ethernet Controller device has three signals that can be used for disabling Ethernet functions from system BIOS. LAN0_DIS_N and LAN1_DIS_N are the separated port disable signals and DEV_OFF_N is the device disable signal. Each signal can be driven from a system output port. Choose outputs from devices that retain their values during reset. For example, ICH7 resumes GPIO outputs (GP24, 25, 27, 28) transition high during reset. It is important not to use these signals to drive LAN0_DIS_N or LAN1_DIS_N because these inputs are latched upon the rising edge of PE_RST_N or an inband reset end. The DEV_OFF_N input is completely asynchronous and does not have this restriction.

Each PHY may be disabled if its LAN function's LAN Disable input indicates that the relevant function should be disabled. Since the PHY is shared between the LAN function and manageability, it may not be desired to power down the PHY in LAN Disable. The PHY_in_LAN_Disable EEPROM bit determines whether the PHY (and MAC) are powered down when the LAN Disable pin is asserted. Default is not to power down.

A LAN port may also be disabled through EEPROM settings. If the LAN_DIS EEPROM bit is set, the PHY enters power down. Note, however, that setting the EEPROM LAN_PCI_DIS bit does not bring the PHY into power down.

Table 1. PCI/LAN Function Index

 

LAN

 

 

 

PCI Function #

Function

Function 0

 

Function 1

 

Select

 

 

 

 

 

 

 

 

Both LAN functions are

0

LAN 0

 

LAN 1

enabled

 

 

 

 

 

 

 

 

 

 

LAN 0 is disabled

0

Dummy

 

LAN1

 

 

 

 

 

LAN 1 is disabled

0

LAN 0

 

-

 

 

 

 

 

LAN 0 is disabled

1

LAN 1

 

-

 

 

 

 

 

Both LAN functions are

1

LAN 1

 

LAN 0

enabled

 

 

 

 

 

 

 

 

 

 

LAN 1 is disabled

1

Dummy

 

LAN 0

 

 

 

 

 

 

 

 

 

 

 

All PCI functions are

Both LAN functions are

Don’t Care

disabled

disabled

Whole Device is at deep

 

 

 

 

PD

 

 

 

 

 

9

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Intel 317698-001 manual PCI/LAN Function Index, PCI Function # Select

317698-001 specifications

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