Intel 460GX manual General Purpose I/O Registers, Global Status Register, GPIO8, GPIO7, GPIO6

LPC/FWH Interface Configuration

11.2.8.2Global Status Register

Address Offset:		1Ch-1Dh
Attributes:		Read/Write
Default Value:		0000h
Size:		16 bits
Bit		Description
15:11	Reserved.
10	ECC_STS: This bit is set when ECCINT# asserted for more than 1 PCI clock with the ECC SERR#
	bit in configuration space set, or for one or more clocks if the ECC SERR# bit is not set. The
	setting of this bit will cause an SMI if the ECC_EN bit in the Global Control and Enable register
	(offset 1A-1Bh) is set. This bit is only set by hardware and can only be cleared by writing a 1 to this
	bit position.
9	BIOSWEN_STS: This bit is set when the BIOSWEN bit in configuration register 4Eh of Function 0
	is set. The setting of this bit will cause an SMI. This bit is only set by hardware and can only be
	reset by writing a one to this bit position.
8	EXTSMI_STS: This bit is set when a GPIO is programmed as an input, is routed to generate an
	SMI#, and its register bit is set. Additionally if the EXTSMI_EN bit is set, the setting of the
	EXTSMI_STS bit will cause the following, depending on the current state:
	If in the S0/C0, S0/C1 or S0/C2 states: An SMI event will be generated.
	If in an S1 state, then a Wake event will be generated, and SMI# will also be generated.
	If in an S3-S5 state, a Wake event will be generated, but no SMI# will be generated.
	This bit is only set by hardware and can only be reset by writing a one.
7	SWSMI_TMR_STS: This bit will be set to 1 by the hardware when the Software SMI# Timer
	expires. This bit will remain 1 until software writes a 1 to this bit. The default of this bit is 0.
6	1MIN_STS: This hardware will set this bit to 1 when the 1-minute timer expires. This will also
	cause an SMI#. This bit will remain a 1 until the software writes a 1 to this bit. The default of this bit
	is 0.
5	GP_REG_STS: This bit is an OR of the bits in the ACPI General Purpose Register (offset 0Ch).
4	PM1_REG_STS: This bit is an OR of the Power Management 1 Status Register (offset 00h) bits.
3	APM_STS: SMI# was generated by a write access to the APM control register. An SMI is
	generated when the APMC_EN bit is set. This bit is cleared by writing a 1.
2	Reserved.
1	LEGACY_USB_STS: This bit is an OR of the SMI status bits in the USB Legacy Keyboard
	Register ANDed with the enable bits.
0	BIOS_STS: SMI# was generated due to ACPI software requesting attention (writing a 1 to the
	GBL_RLS bit with the BIOS_EN bit set). This bit is set by hardware and cleared by software writing
	a 1.

11.2.9General Purpose I/O Registers

For the following GPIO Registers, bits 28:16 refer to the Muxed GPIO signals, and bits 8:0 refer to the dedicated GPIO signal.

Bit	GPIO	Bit	GPIO
28	GPIO[22]	8	GPIO[8]
27	GPIO[21]	7	GPIO[7]
26	GPIO[20]	6	GPIO[6]

Intel® 460GX Chipset Software Developer’s Manual 11-37