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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 183
HostControl – RW - 8 bits - [ASF_IO: 02h]
Field Name Bits Default Description
PECEnable 7 0b 0: PEC disable
1: PEC enable, enable CRC checking when ASF HC presents
as SM master and SM slave.
HostCommand – RW - 8 bits - [ASF_IO: 03h]
Field Name Bits Default Description
HostCommand 7:0 00h Command to be transmitted by master
SlaveAddress– RW - 8 bits - [ASF_IO: 04h]
Field Name Bits Default Description
RW 0 0b 0: Write
1: Read
Address 7:1 00h Provide the SM address of Slave
Data0– RW - 8 bits - [ASF_IO: 05h]
Field Name Bits Default Description
Data0 7:0 00h Contains count or DATA0 field of transaction
Data1– RW - 8 bits - [ASF_IO: 06h]
Field Name Bits Default Description
Data1 7:0 00h Contains DATA1 field of transaction
DataIndex– RW - 8 bits - [ASF_IO: 07h]
Field Name Bits Default Description
DataIndex 7:0 00h Index to 32 Data registers.
PEC– RW - 8 bits - [ASF_IO: 08h]
Field Name Bits Default Description
PEC 7:0 00h PEC byte to be sent to slave.
ASFStatus– RW - 8 bits - [ASF_IO: 0Ah]
Field Name Bits Default Description
EnableStatus 7 0b 1: Reset all the status bit in this register.
0: Enable status bit in this register
Reserved 6:4 000b
RemotePowerCycle 3 0b Power cycle has happened from ASF
RemotePowerUp 2 0b Power up has happened. from ASF
RemotePowerDown 1 0b Power down has happened from ASF
RemoteReset 0 0b Reset has happened from ASF