Intel PCI Initialization Control 3 Word 14h1 high byte, 24h high byte, 82546GB/EB uses INTB#

EEPROM Interface

5.6.26Initialization Control 3 (Word 14h1 high byte, 24h high byte)

This word controls the general initialization values.

Table 5-12. Initialization Control 3

Bit	Name	Description
7:5	Reserved	Reserved. Set these bits to 0b.
		Controls the value advertised in the Interrupt Pin field of the PCI
		Configuration header for this device/function.
		A value of 0b (default), reflected in the Interrupt Pin field, indicates that
4	Interrupt Pin	the 82546GB/EB uses INTA#; a value of 1b indicates that the
		82546GB/EB uses INTB#.
		If only a single device/function of the Ethernet controller is enabled, this
		value is ignored and the Interrupt Pin field of the enabled device reports
		INTA# usage.
		Set this bit to 0b (default) to enable the FLASH logic.
3	FLASH Disable	Set this bit to 1b to disable the FLASH logic. Note that the Expansion
		ROM & secondary FLASH access BARs in PCI configuration space are
		also disabled.
		Initial value of Advanced Power Management Wakeup Enable in the
2	APM Enable	Wakeup Control Register (WUC.APME).
		The default for this bit is 0b.
		Initial value of Link Mode bits of the Extended Device Control Register
		(CTRL_EXT.LINK_MODE), specifying which link interface and protocol
		is used by the MAC.
		For Address 24h (High Byte) / LAN A
		00b = MAC operates in GMII/MII mode with internal copper PHYa
		01b = External GMII/MII mode
1:0	Link Mode	10b = Internal SerDes mode (not applicable to the 82540EP/EM)
		11b = MAC operates in TBI mode using external TBI interface
		For Address 14h (High Byte) / LAN B
		00b = MAC operates in GMII/MII mode with internal copper PHY
		01b = Reserved
		10b = Internal SerDes mode (not applicable to the 82540EP/EM)
		11b = MAC operates in TBI mode using external TBI interface

a.For the 82540EP/EM, 82541PI/GI/EI, and 82547GI/EI to properly communicate with the internal copper PHY, this value must be set to 00b.

Note: Since the 82546GB/EB is a dual-port device, the Initialization Control Word 3 bit assignments are port specific.

1.Applicable to the 82546GB/EB only.

Software Developer’s Manual 115