AMD SB600 User Manual
Page 118
©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].