Intel 460GX manual General Purpose 0 Enable, Reserved, Power up, this bit is set to ‘1’, CF9 write

LPC/FWH Interface Configuration

Bit	Description
15:12	Reserved.
11	PWR_FAIL: This bit will be set to 1 when a power failure occurs. This is defined as either PWROK
	or RSMRST# going inactive unexpectedly. This bit is only set by hardware and can only be reset by
	writing a one to this bit position. This bit is not affected by a hard reset caused by a CF9 write. Upon
	power up, this bit is set to ‘1’.
10	RI_STS: This bit will be set by 1 to hardware when the RI# input signal goes active. This bit can be
	reset only by writing a one to this bit position. This bit is not affected by a hard reset caused by a
	CF9 write.
9	Reserved.
8	USB1_STS: This bit is set when the USB controller for ports 0 and 1 needs to cause a wake/break
	event. Additionally if the USB1_EN bit is set, the setting of the USB1_STS bit will generate a wake/
	break event. This bit is only set by hardware and can only be reset by writing a one to this bit
	position. This bit is not affected by a hard reset caused by a CF9 write.
7	THRMOR_STS: This is the thermal interrupt over-ride status. This bit is 1 anytime a thermal over-
	ride condition occurs and starts throttling the CPU’s clock at the THRM_DTY ratio. This bit is set by
	hardware and can only be cleared by writing a one to this bit position.
6:2	Reserved.
1	NMI_STS: This indicates that an external device generated SERR# or IOCHK#. If the NMI_EN bit is
	set in the General Purpose 0 Enable Register, then the setting of this bit will generate an SCI. This
	bit is set by hardware and can only be cleared by writing a ‘1’ to this bit position.
0	THRM_STS: This is the thermal interrupt status bit. This bit gets set anytime the THRM# signal is
	driven active as defined by the THRM_POL bit. Additionally if the THRM_EN bit is set then the
	setting of the THRM_STS bit will additionally generate a power management event (SCI or SMI).
	This bit is only set through hardware (the THRM# signal being driven active), and is cleared by
	software writing a one to this bit position.

11.2.7.6General Purpose 0 Enable

	Address Offset:		OE-0Fh
	Attributes:		Read/Write
	Default Value:		0000h
	Size:		16 bits
	Bit		Description
	15:13	Reserved.
	12	AFTERG3: If set to 0, the IFB will boot the system after the power is returned after a power
		failure. If set to 1, the IFB will not boot the system after a power failure and will wait for a wake
		event (such as the Power Button being pressed). This bit is automatically set to 1 if a Power
		Button Override occurs. Upon power up, this bit is undefined.
	11	Reserved.
	10	RI_EN: When RI_EN and RI_STS are both set, a Wake event will occur. If RI_EN is not set,
		then when RI_STS is set, no Wake event will occur. This bit must be maintained even in the G3
		state. This bit is automatically set to 0 if a Power Button Override occurs. Upon power up, this
		bit is undefined.
	9	Reserved.
	8	USB1_EN: This bit is used to enable the setting of the USB1_STS bit to generate a wake/break
		event. The USB1_STS bit is set anytime the USB controller for ports 0 and 1 signals a wake/
		break event. The value of this bit must be maintained, even through a G3 state. The IFB will not
		resume, from USB, after power failure (RSMRST# low). This bit is automatically set to 0 if a
		Power Button Override occurs. Upon power up, this bit is undefined.
	7:2	Reserved.
11-34			Intel® 460GX Chipset Software Developer’s Manual