82575 Ethernet Controller Design Guide

Table 2.

Strapping Options for LAN Disable

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Symbol

 

Ball #

 

 

Name and function

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

This pin is a strapping option pin always active. This pin has an internal weak pull-up

 

 

 

LAN1_DIS_N

 

A15

 

resistor. In case this pin is not connected or driven hi during init time, LAN 1 is

 

 

 

 

 

enabled. In case this pin is driven low during init time, LAN 1 function is disabled.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

This pin is also used for testing and scan.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

This pin is a strapping option pin always active. This pin has an internal weak pull-up

 

 

 

LAN0_DIS_N

 

B13

 

resistor. In case this pin is not connected or driven hi during init time, LAN 0 is

 

 

 

 

 

enabled. In case this pin is driven low during init time, LAN 0 is disabled. This pin is

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

also used for testing and scan.

 

 

 

 

 

 

 

 

 

 

Table 3.

Control Options for LAN Disable

 

 

 

 

 

 

 

 

 

 

 

Function

 

Default

Control options

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LAN 0

 

 

1

Strapping Option + EEPROM word 20h bit 13 (full/PCI

 

 

 

 

 

 

 

only disable in case of strap)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Strapping Option + EEPROM word 10h bit 13 (full/PCI

 

 

 

 

 

LAN 1

 

 

1

only disable in case of strap)/ EEPROM Word 10h bit 11

 

 

 

 

 

 

(full disable) / EEPROM word 10h bit 10 (PCI only

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

disable)

 

 

 

 

 

 

 

 

 

 

 

 

 

3.2.2Serial EEPROM

The 82575 Ethernet Controller Gigabit Ethernet Controller uses an Serial Peripheral Interface (SPI)* EEPROM. Several words of the EEPROM are accessed automatically by the device after reset to provide pre-boot configuration data before it is accessed by host software. The remainder of the EEPROM space is available to software for storing the MAC address, serial numbers, and additional information. This information is available to the 82575 Ethernet Controller also and is part of the pre-boot configuration data.

The 82575 has a thermal sensor that can send alerts. Trip points for the sensor are set in the EEPROM. For information regarding the use of the sensor and the programming its function in the EEPROM, please refer to the EEPROM Programming Information and Map Application Note.

3.2.2.1General Regions

The EEPROM is divided into four regions based on the type of access:

Hardware accessed--this region is accessed by other hardware

Alert (ASF) accessed--this region is accessed by alert routines

PT accessed--this region is accessed by the pass-through routines

Software accessed--this region is accessed by applications

3.2.2.2EEPROM-less Operation

The 82575 can be operated without an EEPROM, however the following conditions apply:

Non-manageability mode only

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Intel 317698-001 manual Serial Eeprom, General Regions, EEPROM-less Operation, Symbol Ball # Name and function

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