AMD SB600 Technical Reference Manual page 180

SmiCmdStatus - RW - 8 bits – [SmiCmdBlk: 01h]
Field Name Bits Default Description
This register is located at the base address defined by AcpiSmiCmd + offset 1.
©2008 Advanced Micro Devices, Inc.
SMBus Module and ACPI Block (Device 20, Function 0)
AMD SB600 Register Reference Manual Proprietary Page 180