WM8850
Pre-Production
AMPLIFIER GAIN/MUTE VERB
Verb ID
Payload [15:0]
Response[31:0]
Get
Get
Set
Bh
A000h
Bits [31:0] in the response table below –
applies to the left channel only
Bh
3h
8000h
Bits [31:0] in the response table below –
applies to the right channel only
Bits [15:0] in the set table below
00000000h
Response Table:
Bit
Bitfield Name
RW
R
Default
000000h
1
Description
[31:8]
[7]
Rsvd
Reserved
Amplifier Mute
R
Shows the amplifier mute status of the selected channel:
0 = Normal
1 = Muted
[6:0]
Amplifier Gain
R
7Fh
Shows the amplifier gain setting (step number) for the selected channel.
The actual gain applied is determined by the Output Amplifier
Capabilities Parameter in the AFG, and is shown below for convenience:
00h = −63.5dB
01h = −63.0dB
… 0.5dB steps
7Eh = −0.5dB
7Fh = 0dB
Note: If the H-Phn Enable register in the Port-A (NID=11h) Pin Widget
Control Verb is set to 1, the actual gain setting applied has an offset of
−8dB from the setting configured by the Gain register.
Set Table:
Bit
Bitfield Name
RW
Default
Description
[15]
Set Output Amp
W
1
Indicates that the programming refers to the output amplifier on this
widget
[14]
[13]
Set Input Amp
Set Left Amp
W
W
0
1
Not applicable to this widget
0 = Left channel amplifier does not accept the values in Mute or Gain
fields
1 = Left channel amplifier does accept the values in the Mute and Gain
fields
[12]
Set Right Amp
W
1
0 = Right channel amplifier does not accept the values in Mute or Gain
fields
1 = Right channel amplifier does accept the values in the Mute and Gain
fields
[11:8]
[7]
Index
Mute
W
W
0h
1
Not applicable to this widget
0 = Normal operation
1 = Mute
[6:0]
Gain
W
7Fh
Step number of the gain – see Amplifier Gain in response table above for
details of actual gain values
PP, April 2011, Rev 3.2
122
w
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
