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©2008 Advanced Micro Devices, Inc.
HD Audio Controllers Registers
AMD SB600 Register Reference Manual Proprietary Page 230
Interrupt Line – RW – 8 bits – [PCI_Reg: 3Ch]
Field Name Bits Default Description
Interrupt Line
7:0 00h This register is used to communicate to software the
interrupt line that the interrupt pin is connected to. It is not
used by the HD Audio controller.
Interrupt Pin – R – 8 bits – [PCI_Reg: 3Dh]
Interrupt Pin 3:0 1h This register reflects the value programs into Interrupt
Control Pin register at offset 44h, bits[3:0]
Reserved 7:4 0h Reserved
Minimum Grant – R – 8 bits – [PCI_Reg: 3Eh]
Field Name Bits Default Description
Minimum Grant 7:0 00h Hardwired to “0”.
Maximum Latency – R – 8 bits – [PCI_Reg: 3Fh]
Field Name Bits Default Description
Maximum Latency 7:0 00h Hardwired to “0”.
Misc Control Register – RW – 8 bits – [PCI_Reg: 42h]
Field Name Bits Default Description
Disable Non-noop
0 0b 1: Non-snoop attribute is disabled on Buffer Descriptor and
Data Buffer DMA.
0: Set the Non-snoop attribute on Buffer Descriptor and
Data Buffer DMA when the Traffic Priority bit is set in the
Stream Descriptor.
Disable Non-snoop
Override
1 0b 1: Bit[0] of this register controls the Non-snoop attribute
0: override the bit[0] setting meaning always generate No
Snoop attribute on Buffer Descriptor and Data Buffer DMA
Enable Non-snoop
Request
2 0b 1: Enable Non-snoop request to ACPI
0: Disable Non-snoop request to ACPI
When enabled and the DMA cycle is Non-snoop, ACPI will
not generate a wake to CPU in C2 state.
Reserved
7:3 00h Reserved
Interrupt Pin Control Register – RW – 8 bits – [PCI_Reg: 44h]
Field Name Bits Default Description
Interrupt Pin Control
3:0 1h Controls the value reports in Interrupt Pin Register at offset
0x3D.
Reserved
7:4 0h Reserved
Power Management Capability ID – R – 16 bits – [PCI_Reg: 50h]
Field Name Bits Default Description
Capability ID 7:0 01h Hardwired to 01h. Indicates PCI Power Management
Capability.
Next Capability Pointer 15:8 60h Hardwired to 60h.
Next capability is at offset 60h