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 (NID = 01h), and is shown below for
convenience:
00h = −63.5dB
01h = −63.0dB
… 0.5dB steps
7Eh = −0.5dB
7Fh = 0dB
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 accepts 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 accepts 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
134
w
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
