Intel PCI-X, Intel Gigabit Ethernet Controllers manual Asdv, PCI66, Pcixmode, Pcixspd

Register Descriptions

Field	Bit(s)	Initial	Description
		Value
			Link speed setting
			Indicates the configured speed of the link.
			These bits are either forced by software when forcing the link
			speed through the CTRL.SPEED control bits, automatically set
			by hardware when Auto-Speed Detection is enabled or reflect
			the internal indication inputs from the PHY.
			When Auto-Speed Detection is enabled, the Ethernet
SPEED	7:6	X	controller’s speed is configured only once after the internal link
			is asserted.
			Speed indication is mapped as follows:
			00b = 10 Mb/s
			01b = 100 Mb/s
			10b = 1000 Mb/s
			11b = 1000 Mb/s
			These bits are not valid in TBI mode/internal SerDes.
			Auto Speed Detection Value
			Indicates the speed sensed by the Ethernet controller from the
ASDV	9:8	X	internal PHY. The ASDV status bits are provided for diagnostics
			purposes. The ASD function can be initiated by software writing
			a logic 1b to the CTRL_EXT.ASDCHK bit. The resultant speed
			detection is reflected in these bits. See Section 13.4.6 for
			details.
Reserved	10	X	Reserved
			Reads as 0b.
			PCI Bus speed indication
PCI66	11	X	When set, indicates that the PCI bus is running at 66 MHz.
			Reflects the M66EN input pin.
			Note: Not applicable to the 82547GI/EI.
			PCI Bus Width indication
BUS641	12	X	When set, indicates that the Ethernet controller is sitting on a
			64-bit PCI/PCI-X bus. BUS64 is determined by REQ64#
			assertion.
PCIX_MODE1	13	X	PCI-X Mode indication
			When set to 1b, the Ethernet controller is operating in PCI-X
			Mode; otherwise, the Ethernet controller is operating in
			conventional PCI Mode.
PCIXSPD1	15:14	X	PCI-X Bus Speed Indication
			Attempts to indicate the speed of the bus when operating in a
			PCI-X bus. Only valid when STATUS.PCIX_Mode = 1b.
			00b = 50-66 MHz
			01b = 66-100 MHz
			10b = 100-133 MHz
			11b = Reserved
Reserved	31:16	0b	Reserved
			Reads as 0b.

1.Not applicable to the 82540EP/EM, 82541xx, or 82547GI/EI.

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