Intel PCI-X manual Status Register Bit Description, Txoff, Tbimode

Register Descriptions

Table 13-5. Status Register Bit Description

31 13 12 0

Reserved

Status

Field	Bit(s)	Initial	Description
		Value
			Link Full Duplex configuration Indication
			When cleared, the Ethernet controller operates in half-duplex;
FD	0	X	when set, the Ethernet controller operates in Full duplex.
			The FD provides the duplex setting status of the Ethernet
			controller as set by either Hardware Auto-Negotiation function,
			or by software.
			Link Up Indication
			0b = no link config; 1b = link config.
			For TBI mode/internal SerDes operation: If Auto-Negotiation is
LU	1	X	enabled, this bit is set if a valid link is negotiated. If link is forced
			through CTRL.SLU, it reflects the status of this control bit.
			For internal PHY mode of operation: Reflects the status of the
			internal link signal indicating a transition to a Link Up.
			See Section 8.6 for more information about Auto-Negotiation.
			Function ID.
			Provides software a mechanism to determine the Ethernet
Function ID	3:2	0b	controller function number (LAN identifier) for this MAC. Read
			as: [0b,0b] LAN A, [0b,1b] LAN B.
			Note: These settings are only applicable to the 82546GB/EB.
			For all other Ethernet controllers, set these bits to 0b.
			Transmission Paused
			When set, Indicates the transmit function is in Pause state due
TXOFF	4	X	to reception of an XOFF pause frame when symmetrical flow
			control is enabled. It is cleared upon expiration of the pause
			timer, or receipt of an XON frame. Applicable only while working
			in full-duplex flow-control mode of operation.
			TBI Mode/internal SerDes Indication
			When set, the Ethernet controller is configured to work in TBI
			mode/internal SerDes of operation.
TBIMODE	5	X	When clear, the Ethernet controller is configured to work in
			internal PHY mode.
			Note: For the 82544GC/EI, reflects the status of the TBI_MODE
			input pin.
			For all other Ethernet controllers, set this bit to 0b.

226 Software Developer’s Manual