Intel Intel Gigabit Ethernet Controllers 82541EI/82547GI B0 stepping, 82541/GI/ER and 82547GI B1

Register Descriptions

Table 13-35. PHY Interrupt Enable Bit Description

Field	Bit(s)		Description	Mode	HW Rst	SW Rst
Page Received	12	1b	= Interrupt enable.	R/W	0b	Retain
Interrupt Enable		0b	= Interrupt disable.
Duplex Changed	13	1b	= Interrupt enable.	R/W	0b	Retain
Interrupt Enable		0b	= Interrupt disable.
Speed Changed	14	1b	= Interrupt enable.	R/W	0b	Retain
Interrupt Enable		0b	= Interrupt disable.
Auto-Negotiation		1b	= Interrupt enable.
Error	15			R/W	0b	Retain
		0b	= Interrupt disable.
Interrupt Enable

PHY Port Control Register (82541xx and 82547GI/EI Only)

PPCONT (18d; R/W)

Table 13-36. PHY Port Control Register Bit Description

Field	Bit(s)	Description	Mode	HW Rst	SW Rst
Reserved	3:0	Always read as 0b. Write to 0b for	R/W	0b	0b
		normal operation.
TP Loopback	4	Allow gigabit loopback on twisted pairs.	R/W	0b	0b
		82541EI/82547GI (B0 stepping):
		Reserved, write to 0b.
Fast Downshift		82541/GI/ER and 82547GI (B1
	5	stepping): Fast 1000 Mb to 100 Mb	R/W	0b	0b
Enable
		downshift enable.
		0b = Downshift after 16 seconds.
		1b = Downshift after 10 seconds.
Reserved	8:6	Always read as 0b. Write to 0b for	R/W	0b	0b
		normal operation.
Non-Compliant		1b = Detect and correct for non-
		compliant scrambler.			0b1
Scrambler	9		R/W	0b
		0b = Detect and report non-compliant
Compensation
		scrambler.
		1b = Extend CRS to cover GMII latency
TEN_CRS_Select	10	and RX_DV.	R/W	1b	1b
		0b = Do not extend CRS (RX_DV can
		continue past CRS).
Reserved	11	Always write as 1b for normal operation.	R/W	1b	1b
		Auto-MDI-X algorithm enable.
		1b = Enable Auto-MDI-X mode.
		0b = Disable Auto-MDI-X mode (manual
Auto-MDI-X	12	mode).	R/W	1b	1b
		Note: When forcing speed to 10Base-T
		or 100Base-T, use manual mode. Clear
		the bit and set PHY register 18, bit 13
		according to the required MDI-X mode.

Software Developer’s Manual 267