WM8850 datasheet(46/223 Pages) WOLFSON

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WM8850

Pre-Production

PP, April 2011, Rev 3.2

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

NID

09h

Widget Type

Audio Selector

Supported Get Verbs

F00h, F01h, F02h

Supported Set Verbs

701h

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

Ah, F00h, F02h, F03h, F05h, F06h, F08h, F8Eh, FB1h

Supported Set Verbs

2h, 703h, 705h, 706h, 708h, 78Eh, 7B1h

Unsolicited Responses

Stream Drop

Vendor-Specific Verbs

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.

WM8850 Datasheet(PDF) 46 Page - Wolfson Microelectronics plc

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