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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 175
C3Count - R – 8 bits - [PM_Reg: B4h]
Field Name Bits Default Description
C3Count 7:0 00h The value shows the amount of time the CPU spends in C3.
Each increment represents approximately 0.39% (1/256).
This register is updated by HW automatically every second
C3Count register
SmiIndicator0 - R – 8 bits - [PM_Reg: C0h]
Field Name Bits Default Description
SmiIndicator0 6:0 - This register is a read only register and is meant to help BIOS
to search the SMI source quicker
Bit [0] = 1 means the SMI source is coming from PM_Reg0F
Bit [1] = 1 means the SMI source is coming from CMS (IO
C50/C51, Index02)
Bit [2] = 1 means the SMI source is coming from PM_RegA9
Bit [3] = 1 means the SMI source is coming from PM_Reg1D
Bit [4] = 1 means the SMI source is coming from PM_Reg07
Bit [5] = 1 means the SMI source is coming from PM_Reg06
Bit [6] = 1 means the SMI source is coming from PM_Reg05
Bit [7] = 1 means the SMI source is coming from PM_Reg01
Reserved 7 0b
SmiIndicator0 register
SmiIndicator1 - R – 8 bits - [PM_Reg: C1h]
Field Name Bits Default Description
SmiIndicator1 4:0 - This register is a read only register and is meant to help BIOS
to search the SMI source quicker
Bit [0] = 1 means the SMI source is coming from PM_Reg5F
Bit [1] = 1 means the SMI source is coming from PM_Reg5D
Bit [2] = 1 means the SMI source is coming from PM_Reg5C
Bit [3] = 1 means the SMI source is coming from PM_Reg5B
Bit [4] = 1 means the SMI source is coming from PM_Reg5A
Reserved 7:5 000b
SmiIndicator1 register
SmiIndicator2 - R – 8 bits - [PM_Reg: C2h]
Field Name Bits Default Description
SmiIndicator2 5:0 - This register is a read only register and is meant to help BIOS
to search the SMI source quicker
Bit [0] = 1 means the SMI source is coming from HWM
(PMIO2)
Bit [1] = 1 means the SMI source is coming from AMDSI
(PMIO2)
Bit [2] = 1 means the SMI source is coming from the fan
monitor (PMIO2)
Bit [3] = 0 means the SMI source is coming from RTC VRT
(IO 70/71, index 0D, bit 7). This bit is inverted.
Bit [4] = 1 means the SMI source is coming from SCI
Bit [5] = 1 means the SMI source is coming from
ACPI_GEVENT_STATUS
Reserved 7:6 00b
SmiIndicator2 register