alc885-gr Realtek Semiconductor Corporation, alc885-gr Datasheet - Page 73

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alc885-gr

Manufacturer Part Number
alc885-gr
Description
7.1+2 Channel High-performance Hda Codec With Content Protection
Manufacturer
Realtek Semiconductor Corporation
Datasheet

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8.24. Verb – Execute Pin Sense (Verb ID=709h)
8.25. Verb – Get Volume Knob Widget (Verb ID=F0Fh)
7.1+2 Channel High-Performance HDA Codec
With Content Protection
Command Format
Bit [31:28]
‘Payload’ in Command Bit[7:0]
Get Command Format
Bit [31:28]
Codec Response for NID = 21h (Volume Knob Widget)
CAd=X
CAd=X
31:8
7:1
Bit
Bit
6:0
0
7
Node ID=21h
Node ID=Xh
Bit [27:20]
Bit [27:20]
Reserved. Read as 0’s
Reserved
Direct
Volume in steps
Description
Right (Ring) Channel Select
0: Sense Left channel (Tip)
1: Sense Right channel (Ring)
The ALC885 does not support hardware impedance sensing and will ignore this control.
Description
0: The volume generated by external HW volume control will be sent by unsolicited response. Software
is responsible for programming the amplifier appropriately.
1: The volume generated by external HW volume control will directly affect the volume of the amplifier.
The ALC885 does not support ‘Direct’ mode and will respond with 0s for this bit.
Table 66. Verb – Execute Pin Sense (Verb ID=709h)
Table 67. Verb – Get Volume Knob (Verb ID=F0Fh)
Verb ID= F0Fh
Verb ID= 709h
Bit [19:8]
Bit [19:8]
Payload Bit [7:0]
Payload Bit [7:0]
Right Channel[0]
65
0’s
Bit[31:8]=0s, Bit[7:0] is volume
Codec Response Format
Codec Response Format
Response [31:0]
Response [31:0]
0’s for all nodes
ALC885 Series
Datasheet
Rev. 1.1