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©2008 Advanced Micro Devices, Inc.
AC ’97 Controller Functional Descriptions
AMD SB600 Register Reference Manual Proprietary Page 202
MSI Capability Register Set IDs- R – 16 bits – [PCI_Reg: 40h]
Field Name Bits Default Description
Capability ID 7:0 05h Read only. 05h indicates it is an MSI capability register set.
Pointer to Next ID 15:8 00h Read only. 00h indicates there is no additional register set.
MSI Message Control Register- RW – 16 bits – [PCI_Reg: 42h]
Field Name Bits Default Description
MSI Enable 0 0b 0 - Function Is disabled from using MSI.
1 - Function is enabled to use MSI.
Multiple Message
Capable
3:1 0h Hardwired to 0 to indicate the device would like 1 message
allocated to it.
Multiple Message
Enable
6:4 0h Read/Write. Software programs a 3-bit value into this field
indicating the actual number of messages allocated to the
device. The number allocated can be equal or less than the
number actually requested. The field is encoded as follows:
Value Number of Messages Requested
000b 1
001b 2
010b 4
011b 8
100b 16
101b 32
110b reserved
111b reserved
64-bit Address
Capable
7 0b Hardwired to 0 to indicates that function does not implement the
upper 32 bits of the Message Address register and is incapable
of generating a 64-bit memory address.
Reserved 15:8 00h
MSI Message Address Register- RW – 32 bits – [PCI_Reg: 44h]
Field Name Bits Default Description
Reserved 1:0 Reserved.
MSI Address 31:2 0000_00
00h
Lower 32 bits of the system specified message address always
DW aligned.
MSI Message Data Register- RW – 16 bits – [PCI_Reg: 48h]
Field Name Bits Default Description
MSI Data 15:0 0h System-specified message.
MSI Program Weight- RW – 8 bits – [PCI_Reg: 4Ch]
Field Name Bits Default Description
Program Weight 5:0 04h This register specifies the programmable priority of audio
device’s message signaled interrupt request.
Reserved 7:6 0h