Intel 8 LAN manual 1.4.15Shared Initialization Control Word 13h, ICH8-NVMInformation Guide

ICH8—NVM Information Guide

1.4.15Shared Initialization Control (Word 13h)

This word controls general initialization values.

Table 11.	Shared Initialization Control (Word 13h)
	Bit	Name	Default		Description
				Valid Indication
				This is a 2-bit field indicating whether a valid NVM is present to the
				MAC. If this field does not equal 10b, the MAC does not read the
	15:14	SIGN	10b	NVM data and uses default values for device configuration.
				00b = Invalid NVM.
				01b = Invalid NVM.
				10b = Valid NVM present.
				11b = Invalid NVM.
	13:11	Reserved	010b	These bits are reserved and should be set to 010b.
	10	Reserved	1b	Reserved. Always set to 1b.
				For ICH8 designs that support an ACBS implementation using LAN
				Power Control (LAN_PHYPC), this bit enables or disables PHY power
				down.
	9	PHY PD Ena	1b	0b	= PHY power down feature is disabled.
				1b	= PHY power down feature is enabled to power down at DMoff/
				D3 without Wake on LAN.
				This bit is loaded to the PHY Power Down Enable bit in the
				CTRL_EXT register.
	8	Reserved	0b	This bit is reserved and should be set to 0b.
				This field indicates the PHY device type.
				00b = 82566 PHY - GLCI mode
	7:6	PHYT	00b	01b = Reserved
				10b = 82562V PHY - PCIe mode, LCI mode
				11b = Reserved
				This field is reflected in the PHYTYPE field in the Status register.
	5	Reserved	0b	Reserved. Must be set to 0b.
				Force Speed Enable
	4	FRCSPD	0b	0b	= Normal operation.
				1b	= Use ICH8 speed.
				Force Duplex
	3	FD	0b	0b	= Normal operation.
				1b	= Use ICH8 speed.
				This bit is loaded to the CTRL_EXT.EnaKumCK16 bit and enables
				the reduction of the internal JCLK to one-sixteenth of the external
	2	CLK_CNT_1_16	1b	NJCLK at the GLCI interface in Gigabit Ethernet mode.
				0b	= Reduction is disabled.
				1b	= Reduction is enabled.
				This bit enables the automatic reduction of DMA frequency. It is
	1	CLK_CNT_1_4	0b	mapped to STATUS[31].
				0b	= Automatic reduction disabled.
				1b	= Automatic reduction enabled.
		Dynamic Clock		Dynamic Clock Gating
	0		1b	0b	= Disable.
		Gating
				1b	= Enable.

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