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82575 Ethernet Controller Design Guide
10
Table 2. Strapping Options for LAN Disable
Table 3. Control Options for LAN Disable
3.2.2 Serial 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.
3.2.2.1 General 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
3.2.2.2 EEPROM-less Operation
The 82575 can be operated without an EEPROM, however the following conditions
apply:
• Non-manageability mode only
Symbol Ball # Name and function
LAN1_DIS_N A15
This pin is a strapping option pin always active. This pin has an internal weak pull-up
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.
LAN0_DIS_N B13
This pin is a strapping option pin always active. This pin has an internal weak pull-up
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.
Function Default Control options
LAN 0 1
Strapping Option + EEPROM word 20h bit 13 (full/PCI
only disable in case of strap)
LAN 1 1
Strapping Option + EEPROM word 10h bit 13 (full/PCI
only disable in case of strap)/ EEPROM Word 10h bit 11
(full disable) / EEPROM word 10h bit 10 (PCI only
disable)