LPC/FWH Interface Configuration

11.1.8ACPI Base Address (Function 0)

Address:

40-43h

Default Value:

00000001h

Attribute:

Read/Write

 

 

Bit

Description

31:16 Reserved.

15:6 Base Address: Provides the 64 bytes of I/O space.

5:1 Reserved.

0Resource Indicator: Tied to 1 to indicate I/O space

11.1.9ACPI Enable (Function 0)

Address:

44h

Default Value

00

Attribute:

Read/Write

 

 

Bit

Description

7:1 Reserved.

0ACPI Enable: When this bit is set to ‘1’, decode of the I/O range pointed to by the ACPI base register is enabled, and the ACPI power management Function is enabled. Note that the APM power management ranges (B2/B3h) are always enabled and are not affected by this bit.

11.1.10SCI IRQ Routing Control

 

Address:

 

45h

 

 

 

Default Value:

00h

 

 

 

Attributes:

 

Read/Write

 

 

 

 

 

 

 

 

 

 

Bit

 

 

 

Description

 

 

 

 

 

 

 

 

7:3

 

Reserved.

 

 

 

 

 

 

 

 

2:0

 

SCI IRQ Map: Specifies on which pin the SCI will appear on internally. If not using the APIC,

 

 

 

software must program this register to “000”. This interrupt is not sharable. When this interrupt is

 

 

 

chosen, the corresponding interrupt pin is blocked and the SERIRQ frame entry is blocked. This

 

 

 

interrupt can be shared with a PCI interrupt.

 

 

 

 

 

 

 

 

 

 

 

Bits

 

SCI Map

 

 

 

 

 

 

 

 

 

 

 

000

 

IRQ9

 

 

 

 

 

 

 

 

 

 

 

001

 

SCI

 

 

 

 

 

 

 

 

 

 

 

010

 

FEMPTY#

 

 

 

 

 

 

 

 

 

 

 

011

 

IRQ8

 

 

 

 

 

 

 

 

 

 

 

100

 

IRQ0

 

 

 

 

 

 

 

 

 

 

 

101

 

IRQ10

 

 

 

 

 

 

 

 

 

 

 

110

 

IRQ11

 

 

 

 

 

 

 

 

 

 

 

111

 

Reserved

 

 

 

 

 

 

 

11-4

 

 

 

 

Intel® 460GX Chipset Software Developer’s Manual