Pre-Production
WM8850
00h
01h
02h
03h
04h
05h
06h
07h
08h
09h
0Ah
0Bh
0Ch
0Dh
0Eh
0Fh
10h
11h
12h
13h
14h
15h
16h
17h
MIC2 AUDIO INPUT CONVERTER WIDGET (NID = 15H)
STREAM FORMAT VERB
Verb ID
Payload [15:0]
Response[31:0]
Get
Ah
0000h
Bits [31:0] in the table below
Bit
Bitfield Name
Rsvd
RW
R
Default
Description
[31:16]
[15]
0000h
Reserved
Type
R
0
0
Indicates the widget supports only PCM streams
Used to set the base rate frequency:
0 = 48 kHz
[14]
Base
R
1 = 44.1 kHz
[13:11]
[10:8]
Mult
Div
R
R
0h
0h
Used to set the base rate multiplication factor:
0h = x1 (48kHz, 44.1kHz or less)
1h = x2 (32kHz)
2h-7h = Reserved
Used to set the base rate division factor:
0h = divide by 1 (48kHz, 44.1kHz)
1h = divide by 2 (24kHz, 22.05kHz)
2h = divide by 3 (16kHz, 32kHz)
3h = divide by 4 (11.025kHz)
4h = Reserved
5h = divide by 6 (8kHz)
6h = Reserved
7h = Reserved
[7]
Rsvd
Bits
R
R
0
Reserved
[6:4]
3h
Bits per Sample:
0h = Reserved
1h = 16 bits
2h = 20 bits
3h = 24 bits
4h = 32 bits (Float 32)
5h-7h = Reserved
[3:0]
Chan
R
1h
Number of Channels in each frame of the stream:
0h = 1 channel
1h = 2 channels
2h = 3 channels
3h = 4 channels
4h-Fh = reserved
Note: Register values are read-only. As MIC2 and MIC1 share the DMICLK, the MIC1 Stream Format Verb is used to
configure the sample rate for both converters.
PP, April 2011, Rev 3.2
201
w
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
