WM8850
Pre-Production
SET VERB
BIT
BITFIELD
NAME
DEFAULT
DESCRIPTION
7B2h
7B3h
13:0
Terminal
Count
1FFFh
Set the period of the zero detect timeout clock:
0000h = Timeout disabled
0001h to 03FFh = Reserved
0400h = 1025 x 20.833µs (21.3ms)
0401h = 1026 x 20.833µs (21.4ms)
…
1FFFh = 8192 × 20.833µs (171ms)
…
3FFFh = 16384 × 20.833µs (341ms)
Note: The timeout clock uses the SYNC signal
from the HDA interface, so the absolute value
of the timeout period will depend on the
absolute accuracy of the SYNC signal.
MIC1 MUX (NID = 09h)
Table 13 gives a summary of the MIC1 Mux node:
NODE SUMMARY INFORMATION
09h
NID
Widget Type
Audio Selector
F00h, F01h, F02h
701h
Supported Get Verbs
Supported Set Verbs
Unsolicited Responses
None
Table 13 MIC1 Mux Node Summary Information
MIC1 Mux is used to select the source of the input to the MIC1 node. This can be either from the
analogue microphone input path (from PGA2), or from the digital microphone path (from Port-D).
When the MIC1 Mux is selecting the digital microphone input (Port-D) the WM8850 is automatically
configured to bypass the analogue to digital converter part of the MIC1 node (NID = 03h).
There are no vendor-specific verbs associated with the MIC1 Mux node.
MIC1 (NID = 03H)
Table 14 gives a summary of the MIC1 node:
NODE SUMMARY INFORMATION
NID
02h
Widget Type
Audio Input Converter
Supported Get Verbs
Supported Set Verbs
Unsolicited Responses
Vendor-Specific Verbs
Ah, F00h, F02h, F03h, F05h, F06h, F08h, F8Eh, FB1h
2h, 703h, 705h, 706h, 708h, 78Eh, 7B1h
Stream Drop
F8Eh, 78Eh : Unsolicited Response Priority Control Verb
FB1h, 7B1h : Channel Copy Verb
Table 14 MIC1 Node Summary Information
MIC1 contains a high performance stereo ADC intended for capture of microphone inputs to the
WM8850. MIC1 supports all common sample rates from 8kHz to 48kHz and data widths of 16, 20, 24
and 32-bit (Float-32). The actual processing used by this node is dependant on the type of input
received from the MIC1 Mux (NID = 09h), as the input to MIC1 may come from either an analogue or
digital microphone.
PP, April 2011, Rev 3.2
46
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
