
9.0 System Wake-Up Control (SWC)
(Continued)
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9.4
ACPI REGISTERS
The ACPI registers are organized in three groups, all of which are V
SB
powered. The offsets are related to the base address
determined by the Base Address registers at indexes 62h - 67h in the SWC device configuration.
The PC8741x devices support the following ACPI fixed register groups:
PM1 Event Group (block b), containing the PM1b_STS and PM1b_EN registers, each with a length of two bytes.
PM1 Control Group (block b), containing the PM1b_CNT register with a length of 2 bytes.
General-Purpose Event 1 Group, containing the GPE1_STS and GPE1_EN registers, each with a length of four bytes.
The following abbreviations are used to indicate the Register Type:
G
R/W
= Read/Write.
G
R
= Read from a specific register (write to the same address is to a different register).
G
W
= Write (see above).
G
RO
= Read Only.
G
WO
= Write Only. Reading from the bit returns 0.
G
R/W1C= Read/Write 1 to Clear. Writing 1 to a bit clears it to 0. Writing 0 has no effect.
G
R/W1S = Read/Write 1 to Set. Writing 1 to a bit sets its value to 1. Writing 0 has no effect.
9.4.1
The following table lists the ACPI registers. All these registers are V
SB
powered.
ACPI Register Map
Base
Registers
Offset
Mnemonic
Register Name
Type
Power Well Section
At index
62h, 63h
00h
PM1b_STS_LOW PM1 Status Low Register
RO
V
SB
9.4.2
01h
PM1b_STS_HIGH PM1 Status High Register
R/W1C
V
SB
9.4.3
02h
PM1b_EN_LOW PM1 Enable Low Register
RO
V
SB
9.4.4
03h
PM1b_EN_HIGH PM1 Enable High Register
R/W
V
SB
9.4.5
At index
64h, 65h
00h
PM1b_CNT_LOW PM1 Control Low Register
RO
V
SB
9.4.6
01h
PM1b_CNT_HIGH PM1 Control High Register
Varies per bit
V
SB
9.4.7
At index
66h, 67h
00h
GPE1_STS_0
General-Purpose Status 1 Register 0
R/W1C
V
SB
9.4.8
01h
GPE1_STS_1
General-Purpose Status 1 Register 1
R/W1C
V
SB
9.4.9
02h
GPE1_STS_2
General-Purpose Status 1 Register 2
R/W1C
V
SB
9.4.10
03h
GPE1_STS_3
General-Purpose Status 1 Register 3
R/W1C
V
SB
9.4.11
04h
GPE1_EN_0
General-Purpose Enable 1 Register 0
R/W
V
SB
9.4.12
05h
GPE1_EN_1
General-Purpose Enable 1 Register 1
R/W
V
SB
9.4.13
06h
GPE1_EN_2
General-Purpose Enable 1 Register 2
R/W
V
SB
9.4.14
07h
GPE1_EN_3
General-Purpose Enable 1 Register 3
R/W
V
SB
9.4.15