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General Initialization and Reset Operation — Intel
®
82575EB Gigabit Ethernet Controller
324632-003 Intel
®
82575EB Gigabit Ethernet Controller
Revision: 2.1 Software Developer’s Manual and EEPROM Guide
January 2011 29
3.0 General Initialization and Reset
Operation
This section lists all necessary initializations and describes the reset commands for the 82575.
3.1 Power Up State
When the 82575 powers up, it reads the EEPROM. The EEPROM contains sufficient information to bring
the link up and configure the 82575 for manageability and/or APM wakeup. However, software
initialization is required for normal operation.
3.2 Initialization Sequence
The following sequence of commands is typically issued to the 82575 by the software device driver in
order to initialize the 82575 to normal operation. The major initialization steps are:
• Disable Interrupts - see Interrupts during initialization.
• Issue Global Reset and perform General Configuration - see Global Reset and General
Configuration.
• Setup the PHY and the link - see Link Setup Mechanisms and Control/Status Bit Summary.
• Initialize all statistical counters - see Initialization of Statistics.
• Initialize Receive - see Receive Initialization.
• Initialize Transmit - see Transmit Initialization.
• Enable Interrupts - see Interrupts During Initialization.
3.3 Interrupts During Initialization
Most drivers disable interrupts during initialization to prevent re-entrancy. Interrupts are disabled by
writing to the IMC and EIMC registers. Note that the interrupts also need to be disabled after issuing a
global reset, so a typical driver initialization flow might be:
• Disable interrupts
• Issue a Global Reset
• Disable interrupts (again)
•…