Intel 6 SERIES CHIPSET - DATASHEET 01-2011 - Page 531

Datasheet 531
LPC Interface Bridge Registers (D31:F0)
13.8.3.9 ALT_GP_SMI_EN—Alternate GPI SMI Enable Register
I/O Address: PMBASE +38h Attribute: R/W
Default Value: 0000h Size: 16-bit
Lockable: No Usage: ACPI or Legacy
Power Well: Resume
7 Reserved
6
SWSMI_TMR_STS — R/WC. Software clears this bit by writing a 1 to it.
0 = Software SMI# Timer has Not expired.
1 = Set by the hardware when the Software SMI# Timer expires.
5
APM_STS — R/WC. Software clears this bit by writing a 1 to it.
0 = No SMI# generated by write access to APM Control register with APMCH_EN bit set.
1 = SMI# was generated by a write access to the APM Control register with the
APMC_EN bit set.
4
SLP_SMI_STS — R/WC. Software clears this bit by writing a 1 to the bit location.
0 = No SMI# caused by write of 1 to SLP_EN bit when SLP_SMI_EN bit is also set.
1 = Indicates an SMI# was caused by a write of 1 to SLP_EN bit when SLP_SMI_EN bit
is also set.
3
LEGACY_USB_STS — RO. This bit is a logical OR of each of the SMI status bits in the
USB Legacy Keyboard/Mouse Control Registers ANDed with the corresponding enable
bits. This bit will not be active if the enable bits are not set.
0 = SMI# was not generated by USB Legacy event.
1 = SMI# was generated by USB Legacy event.
2
BIOS_STS — R/WC.
0 = No SMI# generated due to ACPI software requesting attention.
1 = This bit gets set by hardware when a 1 is written by software to the GBL_RLS bit
(D31:F0:PMBase + 04h:bit 2). When both the BIOS_EN bit (D31:F0:PMBase +
30h:bit 2) and the BIOS_STS bit are set, an SMI# will be generated. The
BIOS_STS bit is cleared when software writes a 1 to its bit position.
1:0 Reserved
Bit Description
Bit Description
15:0
Alternate GPI SMI Enable — R/W. These bits are used to enable the corresponding
GPIO to cause an SMI#. For these bits to have any effect, the following must be true.
• The corresponding bit in the ALT_GP_SMI_EN register is set.
• The corresponding GPI must be routed in the GPI_ROUT register to cause an SMI.
• The corresponding GPIO must be implemented.
NOTE: Mapping is as follows: bit 15 corresponds to GPIO15... bit 0 corresponds to
GPIO0.