alc880 Realtek Semiconductor Corporation, alc880 Datasheet - Page 73

• Manufacturer Part Number: alc880
• Description: 7.1 Channel High Definition Audio Codec
• Manufacturer: Realtek Semiconductor Corporation

8.40. Get/Set Volume Knob Widget (NID=21h)
7.1 Channel High Definition Audio Codec
Get Command Format
Bit [31:28]
Codec Response for NID=21h (Volume Knob Widget)
Set Command Format (Verb ID=70Yh, Set Control 2)
Bit [31:28]
‘Payload’ in Set Command for NID=21h (Volume Knob Widget)
Bit
Note: Other nodes will ignore this verb.
CAd=X
CAd=X
31:8
31:8
6:0
6:0
Bit
7
7
(Verb ID= F0Fh/70Fh)
Node ID=Xh
Node ID=Xh
Bit [27:20]
Bit [27:20]
Reserved
Direct
Volume in steps
Reserved
Direct
Description
0: The volume generated by an external HW volume control will be sent by unsolicited response.
Software is responsible for programming the amplifier appropriately
1: The volume generated by an external HW volume control will directly affect amplifier volume
Description
0: The volume generated by an external HW volume control will be sent by unsolicited response.
Software is responsible for programming the amplifier appropriately
1: The volume generated by an external HW volume control will directly affect amplifier volume
Reserved
Table 73. Get/Set Volume Knob Widget (NID=21h) (Verb ID= F0Fh/70Fh)
Verb ID=F0Fh
Verb ID=70Fh
Bit [19:8]
Bit [19:8]
Bit[7] is ‘Direct’ control
Payload Bit [7:0]
Payload Bit [7:0]
63
0’s
Track ID: JATR-1076-21
Bit[31:8]=0’s, Bit[7:0] is volume
Codec Response Format
Codec Response Format
Response [31:0]
Response [31:0]
0’s
ALC880 Series
Datasheet
Rev. 1.4