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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 118
I2CShadow1- RW - 8 bits - [PCI_Reg: D4h]
Field Name Bits Default Description
I2CShadow1 register
I2Cshadow2- RW - 8 bits - [PCI_Reg: D5h]
Field Name Bits Default Description
Read/Write ShadowPort2 0 0b Read/Write for Shadow Port 2
This bit must be programmed to 0 because I2C slave
controller only responds to Word Write Transaction.
I2CslaveAddr2 7:1 00h SMBus Slave Address for shadow port 2
This value specifies the address used to match against
incoming I2C addresses for Shadow port 2.
I2Cshadow2 register
I2CBusRevision - RW - 8 bits - [PCI_Reg: D6h]
Field Name Bits Default Description
I2CbusRevision 7:0 00h Revision ID
I2CBusRevision register
MSI_Weight - RW – 8 bits - [PCI_Reg: E0h]
Bits Default Description
MSI_weight 5:0 100000b Used by bios to tune MSI messaging priority
Reserved 7:6 00b
MSI_Weight register
AB_REG_BAR - RW - 32 bits - [PCI_Reg: F0h]
Field Name Bits Default Description
AB_REG_BAR 31:0 0000_000
0h
Base Address for A-link Bridge Register
AB_REG_BAR register
WakeIoAddr- RW - 16 bits - [PCI_Reg: F4h]
Field Name Bits Default Description
WakeIoAddr 15:0 0000h IO Address for C-State Wake-up by CPU (K8 only). The BIOS
can program an address inside K8 and this location. The K8
can then use it to generate an IO write to tell SB to wake from
C state (location inside K8 is TBD).
WakeIoAddr register
MwaitID- RW - 8 bits - [PCI_Reg: F6h]
Field Name Bits Default Description
Mwait_physical_ID 3:0 0100b This is used for P4 dual core system. Two physical CPU IDs
with default values 00 and 01 to match with addr[19:18] of
MWAIT and ADS_after_MWAIT. Usage TBD
Mwait_logical_ID 7:4 0100b This is used for P4 dual core system. Two logical CPU IDs
with default values 00 and 01 to match with addr[17:16] of
MWAIT and ADS_after_MWAIT. Usage TBD
MwaitID register
MwaitSts- R - 8 bits - [PCI_Reg: F7h]
Field Name Bits Default Description
Mwait_cpu0_sts 0 0b Set to 1 by MWAIT with addr[19:18] = Mwait_physical_ID[1:0]
and addr[17:16] = Mwait_logical_ID[1:0]. Cleared by
ADS_after_MWAIT with the same addr[19:16].