SB82371 Intel Corporation, SB82371 Datasheet - Page 44

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SB82371

Manufacturer Part Number
SB82371
Description
82371FB (PIIX) AND 82371SB (PIIX3) PCI ISA IDE XCELERATOR
Manufacturer
Intel Corporation
Datasheet

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82371FB (PIIX) AND 82371SB (PIIX3)
2.2.20.
Address Offset:
Default Value:
Attribute:
This register enables hardware events as system events and break events for power management control.
The default for each system/break event in this register is disabled.
System events: Activity by these events can keep the system from powering down. When a system event is
enabled, the corresponding hardware event activity prevents a Fast Off powerdown condition by reloading the
Fast Off Timer with its initial count.
Break events: These events can awaken a powered down system. When a break event is enabled, the
corresponding hardware event activity powers up the system by negating STPCLK#.
44
31
30
29
28
27:16
15:3
2
1:0
7
6
5
4
3
2
1
0
Bit
Bit
SEE—SYSTEM EVENT ENABLE REGISTER (Function 0)
APMC Write SMI Enable. 1=Enable; 0=Disable.
EXTSMI# SMI Enable. 1=Enable; 0=Disable.
Fast Off Timer SMI Enable. 1=Enable; 0=Disable. When enabled, the timer generates an
SMI when it decrements to zero.
IRQ12 SMI Enable (PS/2 Mouse Interrupt). 1=Enable; 0=Disable.
IRQ8 SMI Enable (RTC Alarm Interrupt). 1=Enable; 0=Disable.
IRQ4 SMI Enable (COM2/COM4 Interrupt or Mouse). 1=Enable; 0=Disable.
IRQ3 SMI Enable (COM1/COM3 Interrupt or Mouse). 1=Enable; 0=Disable.
IRQ1 SMI Enable (Keyboard Interrupt). 1=Enable; 0=Disable.
Fast Off SMI Enable (FSMIEN). 1=Enable (system and break events); 0=Disable.
INTR Enable (FINTREN). 1=Enable (break event); 0=Disable. When enabled, INTR is used
as a global break event. In this case, any IRQ that is generated causes the system to
powerup via the negation of STPCLK#, regardless of the state of bits[15:3,1:0] in this
register.
For the PIIX3, this function should be disabled if an external IOAPIC is used.
Fast Off NMI Enable (FNMIEN). 1=Enable (system and break events); 0=Disable.
82371FB PIIX: Reserved.
PIIX3: Fast Off APIC Enable (FAPICEN). 1=Enable (break event); 0=Disable.
Reserved
Fast Off IRQ[15:3] Enable (FIRQ[15:3]EN). 1=Enable (system and break events);
0=Disable.
Reserved.
Fast Off IRQ[1:0] Enable (FIRQ[1:0]EN). 1=Enable (system and break events); 0=Disable.
A4–A7h
00000000h
Read/Write
Description
Description

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