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©2008 Advanced Micro Devices, Inc.
SMBus Module and ACPI Block (Device 20, Function 0)
AMD SB600 Register Reference Manual Proprietary Page 176
2.3.3.3 ACPI Registers
Register Name Offset Address*
Pm1Status 00h
Pm1Enable 02h
PmControl 00h
PmaControl 00h
TmrValue/ETmrValue 00h
CLKVALUE 00h
PLvl2 04h
PLvl3 05h
PLvl4 06h
AcpiSsCnt 00h
EVENT_STATUS 00h
EVENT_ENABLE 04h
* Note: The offset addresses listed here for the ACPI registers belong to different apertures/decodes. Check the register
descriptions for details.
Pm1Status - RW - 16 bits - [AcpiPmEvtBlk:00h]
Field Name Bits Default Description
TmrStatus 0 0b Timer carry status bit. This bit gets set anytime the 23
rd
/31
st
bit of 24/32 bit counter changes (whenever the MSB changes
from low to high or high to low. While TmrEn and TmrStatus
are set, an interrupt event is raised). [Read-only]
Reserved 3:1 000b
BmStatus 4 0b Bus master status bit. This bit is set any time a system bus
master requests the system bus, and can only be cleared by
writing an one to this bit position.
GblStatus 5 0b This bit is set when an SCI is generated due to the BIOS
wanting the attention of the SCI handler. This is set by writing
1 to PM_Reg: 0Eh bit [1].
Reserved 7:6 00b
PwrBtnStatus 8 0b Power button status bit
Reserved 9 0b
RtcStatus 10 0b This bit is set when RTC generates an alarm.
Reserved 13:11 000b
PciExpWakeStatus 14 0b This bit is set by hardware to indicate that the system woke
due to a PCI Express wakeup event.
WakeStatus 15 0b This bit is set when the system is in the sleep state and a
wake-up event occurs.
This register is located at the base address defined by AcpiPmEvtBlk.
Pm1Enable - RW - 16 bits - [AcpiPmEvtBlk:02h]
Field Name Bits Default Description
TmrEn 0 0b This is the timer carry interrupt enable bit. When this bit is
set then an SCI event is generated anytime the TmrStatus is
set. When this bit is reset then no interrupt is generated
when the TmrStatus bit is set.
Reserved 4:1 0h
GblEn 5 0b If this bit is set, SCI is raised whenever both GblEn and
GblStatus are true.
Reserved 7:6 00b
PwrBtnEn 8 0b If this bit is set, SCI is generated whenever PwrBtnStatus is
true.
Reserved 9 0b
RtcEn 10 0b RTC enable. If this bit is set, SCI is generated whenever
RtcStatus is true.