82546GB/EB and 82545GM/EM Gigabit Ethernet Controller EEPROM Map and Programming Information Application Note (AP-470)

The 82546GB/EB and 82545GM/EM Gigabit Ethernet controllers use an EEPROM device for storing product configuration information. The EEPROM is divided into four general regions:
  • Hardware accessed - loaded by the Ethernet controller after power-up, PCI Reset deassertion, D3->D0 transition, or software commanded EEPROM reset (CTRL_EXT.EE_RST).
  • ASF accessed - loaded by the Ethernet controller in ASF mode after power-up, ASF Soft Reset (ASF FRC_RST), or software commanded ASF EEPROM read (ASF FRC_EELD).
  • Software accessed - used by software only. The meaning of these registers as listed here is a convention for the software only and is ignored by the Ethernet controller.
  • External BMC (TCO) accessed - loaded by external BMC (TCO) from SMBus in passthrough mode after power up.
This app note describes the EEPROM and its contents for products based upon the 82546GB/EB and 82545GM/EM Gigabit Ethernet controllers.

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