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82801BA Datasheet, PDF (337/498 Pages) Intel Corporation – Intel 82801BA I/O Controller Hub 2 (ICH2) and Intel 82801BAM I/O Controller Hub 2 Mobile
LPC Interface Bridge Registers (D31:F0)
Bit
Description
Software SMI Timer Status (SWSMI_TMR_STS)—R/WC.
6 1 = Set by the hardware when the Software SMI# Timer expires.
0 = Software clears this bit by writing a 1 to the bit location.
APM Status (APM_STS)—R/WC.
5 1 = SMI# was generated by a write access to the APM control register with the APMC_EN bit set.
0 = Software clears this bit by writing a 1 to the bit location.
SLP SMI Status (SLP_SMI_STS)—R/WC.
4 1 = Indicates an SMI# was caused by a write of 1 to SLP_EN bit when SLP_SMI_EN bit is also set.
0 = Software clears this bit by writing a 1 to the bit location.
Legacy USB Status (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
3 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.
BIOS Status (BIOS_STS)—R/WC.
1 = SMI# was generated due to ACPI software requesting attention (writing a 1 to the GBL_RLS bit
2
with the BIOS_EN bit set).
0 = This bit cleared by software writing a 1 to its bit position.
1:0 Reserved.
9.8.3.15
MON_SMI—Device Monitor SMI Status and Enable Register
I/O Address:
Default Value:
Lockable:
Power Well:
PMBASE +40h
0000h
No
Core
Attribute:
Size:
Usage:
R/W, R/WC
16-bit
Legacy Only
Bit
Description
15:12
Device 7:4 Trap Status (DEV[7:4]_TRAP_STS)—R/WC. Bit 12 corresponds to Monitor 4, bit 13
corresponds to Monitor 5 etc.
1 = SMI# was caused by an access to the corresponding device monitor’s I/O range.
0 = SMI# was not caused by the associated device monitor.
Device 7:4 Trap Enable (DEV[7:4]_TRAP_EN)—R/W. Bit 8 corresponds to Monitor 4, bit 9
corresponds to Monitor 5 etc.
11:8 1 = Enables SMI# due to an access to the corresponding device monitor’s I/O range.
0 = Disable.
7:0 Reserved
82801BA ICH2 and 82801BAM ICH2-M Datasheet
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